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lakedog55 ![]() Gold Member ![]() Joined: November-11-2010 Location: Lake Weir Fl Status: Offline Points: 835 |
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Thanks guys,
I knew I would get chopped on the idle mixture. Have not had chance to do anymore testing. Lisa's mom had a heart attack and we have been busy. Maybe this weekend. Posting a pic of carb jetting. only change in this is primary squirter size. Put in a bigger one at first had a stumble I could not figure out. Turns out that was bowl setting. ![]() |
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Lakedog55
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backfoot100 ![]() Platinum Member ![]() Joined: January-03-2007 Location: United States Status: Offline Points: 1897 |
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Tom nailed it.
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When people run down to the lake to see what's making that noise, you've succeeded.
Eddie |
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GottaSki ![]() Grand Poobah ![]() Joined: April-21-2005 Location: NE CT Status: Offline Points: 3340 |
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As Eddie would shortly explain as well
changing the idle mix will have no effect on the plug after a good romp. One does not chase plug reading with the idle screws, one gets a good idle and off-idle response with the idle screws, thats it. I think your concern about the plugs appearnce is not founded in method. your plugs went from dark to an improved white somehow, and im most certain it wasn't anything to do with the idle screws, Your looking at the wrong spot on the plug to determine anything further than grey, white, tan,dark, and unless you buy parts and open up the carb, one is not yet jetting. If this were a stock carb with stock jetting, you would not be in any danger of damaging the engine even if you read the plugs incorrectly. But it is not a factory carb,, and its calibration is a bit unkown. For instance, if you found the same mains as a stock carb in there, its only relevent if one also has the same air bleeds and pvco's. The question remains, how did your plugs lighten up to normal looking. Possibly the oil soaked KN is more restrictive and caused a richer condition with at the higher cfm throttle positions. But since the air bleeds are in the same airbox, i suspect it should balance out better then that. To do this right, wot plug chops with fresh plugs, secondaries disabled, Learn how to view and measure the width of the soot ring on the base of the insulator to set the mains. Then rinse/repeat with secondaries active. |
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"There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing."
River Rat to Mole |
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lakedog55 ![]() Gold Member ![]() Joined: November-11-2010 Location: Lake Weir Fl Status: Offline Points: 835 |
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Hi,
Not sure its fixed, still dont like the plugs with the burn going so far down into base. Basically removed the one breather that had hose going to carb. Was getting oil sucked up into arrestor. Then turned the screw the other way on secondary adjustment. Coming in at 400o now. Can still feel them come in but nowhere like it was. Then retuned mixture screws on carb. Cant wait to see what it does on 8 cylinders. Thanks so much for all the input. I think i need to widen gap on plugs. At 45 now Was thinking 50. Maybe that would reduce burn down plug. Mike |
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Lakedog55
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backfoot100 ![]() Platinum Member ![]() Joined: January-03-2007 Location: United States Status: Offline Points: 1897 |
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The plugs do look much better in these last pics over what you originally posted. Like Tom, I'm interested in what you actually did to fix the problem. |
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When people run down to the lake to see what's making that noise, you've succeeded.
Eddie |
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jbear ![]() Grand Poobah ![]() ![]() Joined: January-21-2005 Location: Lake Wales FL. Status: Offline Points: 8193 |
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true that john |
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"Loud pipes save lives"
AdamT sez "I'm Canadian and a beaver lover myself"... |
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lakedog55 ![]() Gold Member ![]() Joined: November-11-2010 Location: Lake Weir Fl Status: Offline Points: 835 |
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pic of breather
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Lakedog55
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lakedog55 ![]() Gold Member ![]() Joined: November-11-2010 Location: Lake Weir Fl Status: Offline Points: 835 |
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Changed out the old breather and went with this style. The old one with hose hooked to arrestor was pulling oil into filter.
![]() ![]() ![]() Plugs seem to getting a burn way down the base. kinda a long white streak? |
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Lakedog55
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lakedog55 ![]() Gold Member ![]() Joined: November-11-2010 Location: Lake Weir Fl Status: Offline Points: 835 |
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Pretty Sure I need The same waiver.
![]() ![]() ![]() adjusted carb which should lean it up a little, also took some choke out. No why it was not super smooth, notice how clean the Number 8 plug was Almost like the spark plug boot was not all the way on. Hope nothing got messed up. I ran it hard, 5k and 45mph on seven cylinders |
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Lakedog55
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Gary S ![]() Grand Poobah ![]() ![]() Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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Eddie had me sign a waiver that John was not to open the motorbox with out another CCF member present
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lakedog55 ![]() Gold Member ![]() Joined: November-11-2010 Location: Lake Weir Fl Status: Offline Points: 835 |
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http://www.correctcraftfan.com/forum/uploads/10536/20160322_203535.jpg http://www.correctcraftfan.com/forum/uploads/10536/20160322_203535.jpg
http://www.correctcraftfan.com/forum/uploads/10536/20160322_184531-1.jpg http://www.correctcraftfan.com/forum/uploads/10536/20160322_184531-1.jpg |
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Lakedog55
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lakedog55 ![]() Gold Member ![]() Joined: November-11-2010 Location: Lake Weir Fl Status: Offline Points: 835 |
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![]() That is one clean plug |
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Lakedog55
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jbear ![]() Grand Poobah ![]() ![]() Joined: January-21-2005 Location: Lake Wales FL. Status: Offline Points: 8193 |
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no idea what you guys are talking about...but I sure love the sound of it.
I know why Eddie usually won't let me under the motor box. john |
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"Loud pipes save lives"
AdamT sez "I'm Canadian and a beaver lover myself"... |
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lakedog55 ![]() Gold Member ![]() Joined: November-11-2010 Location: Lake Weir Fl Status: Offline Points: 835 |
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No way Pete. I am dangerous enough dont need any help
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Lakedog55
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GottaSki ![]() Grand Poobah ![]() Joined: April-21-2005 Location: NE CT Status: Offline Points: 3340 |
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Could you expand on that? |
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"There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing."
River Rat to Mole |
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8122pbrainard ![]() Grand Poobah ![]() ![]() Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Mike, Hopefully you meant the flame arrester that I see pictured and you didn't put a filter on? |
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lakedog55 ![]() Gold Member ![]() Joined: November-11-2010 Location: Lake Weir Fl Status: Offline Points: 835 |
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Hi,
Adjusted the secondarys coming in right at 4k. Can still feel it but not nearly as bad. Leaned out carb some. Got rid of breather to carb and installed a filter type breather. Other set up was sucking oil into air filter. Put in a new pcv. Boat ran good. Very quick out of hole. Have not had chance to look at plugs. I had already ran it with old set up. Did seem like it was not quite as smooth at cruising speed. Got some work to do. Top speed on speedos had me right around 45 with about 5k on the tach |
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Lakedog55
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backfoot100 ![]() Platinum Member ![]() Joined: January-03-2007 Location: United States Status: Offline Points: 1897 |
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Vacuum numbers are significantly affected at altitude. That 6.5PV is way too much if you're truly pulling 12-13". I would experiment with a 4.5 or even possibly a 2.5 and see how it performs. You can also increase your base timing a little bit at altitude. I would think that you can advance the timing by at least 4 or 5 degrees from where you're at now. I think you can figure 1 degree advance/every 1000' elevation from sea level. It really boils down to trial and error. Bump it up and see how it performs. If it increases performance, keep increasing timing. If it starts to ping, back it off till it doesn't. |
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When people run down to the lake to see what's making that noise, you've succeeded.
Eddie |
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Jonny Quest ![]() Grand Poobah ![]() ![]() Joined: August-20-2013 Location: Utah--via Texas Status: Offline Points: 2881 |
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Foot:
Timing is at 10 degrees BTDC at 700 RPM. If memory serves, total advance at 4,800 - 5,000 RPM is about 32 degrees BTDC. Interesting comment about the Power Valve and high elevation. Hmmmm.... When I tuned the QF carb, I used a vacuum gauge to set the idle air/fuel screw and I believe that I was only pulling 12 - 13 inches. Again, high elevation. Well, it seems like I'm getting darn close to "dialed-in". I'm curious to see how the new jets perform. (Don't think I'll mess around with the hotter plugs. Just stay with the 764) JQ |
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Current
2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
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Hollywood ![]() Moderator Group ![]() ![]() Joined: February-04-2004 Location: Twin Lakes, WI Status: Offline Points: 13512 |
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He is running a PCV
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lakedog55 ![]() Gold Member ![]() Joined: November-11-2010 Location: Lake Weir Fl Status: Offline Points: 835 |
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Eddie,
So whats the deal you trying to keep the skier out in front of the nautique. Got to be some reason your not running a pcv. I know that wouldnt be hard with a bow tie. These fords seem to be so fickle to make clean HP. |
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Lakedog55
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backfoot100 ![]() Platinum Member ![]() Joined: January-03-2007 Location: United States Status: Offline Points: 1897 |
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Leave the PCV alone and get it leaned out a little bit. |
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When people run down to the lake to see what's making that noise, you've succeeded.
Eddie |
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backfoot100 ![]() Platinum Member ![]() Joined: January-03-2007 Location: United States Status: Offline Points: 1897 |
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Thanks Rob,
That's some good info. What timing are you running? What is your engine vacuum at your primary elevation which sounds like 4400'? You're getting some pretty impressive performance numbers for that elevation already. I'm no expert and I've never tuned an engine for altitude but the research I've done tells me that spark plugs aren't the answer. Seems most try do go that route but in the end, jet and timing changes are the ticket and the reason I asked about your timing. Most here are running 6.5PV on engines that are pulling 15-17" vacuum at sea level. The vacuum will be lower at your altitude so the 6.5PV may too high. You might have that PV open at anything much above an idle!!!! Get out the vacuum gauge and see where you're at. I think you may need to go down to at least a 5.5 or 4.5. If it were mine, I would get it dialed in for 4400' and on the occasional jaunt to 6200' I would advance the timing a few degrees and put a little less pitch prop on it to keep the RPM's a touch higher and see how it does. It'll be a little rich but not the end of the world. The general rule of thumb is don't worry about any changes for up to 2000' changes in altitude (some say every 1000' but nothing is carved in granite it seems). You're right at that 2000' ceiling in this scenario. Then your trip to Lake Powell is less then 1000' downhill from your base settings. Run a little higher octane (if available) and If that' isn't available, retard the timing a degree or two and go skiing. Don't even mess with anything else. Now, I might be completely wrong on everything. I really have no idea. I'm just a carb junkie looking for new fix. You need to get your ride tuned first at your elevation, The rest should take care of itself with a little common sense. |
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When people run down to the lake to see what's making that noise, you've succeeded.
Eddie |
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lakedog55 ![]() Gold Member ![]() Joined: November-11-2010 Location: Lake Weir Fl Status: Offline Points: 835 |
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Eddie,
I see where it is confusing, your breather looks just like mine, I still have a pcv valve on other side, if i get rid of pcv valve will I see any gains? |
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Lakedog55
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Jonny Quest ![]() Grand Poobah ![]() ![]() Joined: August-20-2013 Location: Utah--via Texas Status: Offline Points: 2881 |
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Backfoot:
You are correct. I have high praise for the QF carbs. I had one little glitch with a needle and seat, but other than that, the QF is a nice piece of engineering. The QF M-600 is the "equivalent" of the standard Holley 4160, but the QF has many features not available on the Holley: - Sight window in float bowl for float adjustment - Exterior float adjustment hardware - Screw-in air bleeds - Screw in jets in the secondary metering block - Adjustable secondary housing unit I realize that "feel" is a very subjective issue, but my engine with the QF carb and DUI distributor FEELS equal to when the TBI / Pro-Tech was working. I was expecting a perfomance downgrade when I make the switch-out, but I've been very pleased with the results. Living in Utah means boating at altitude. I typically frequent Utah Lake (4,400 feet), There are other "alpine" lakes that range from 5,400 to 6,200 feet in elevation. My QF carb came from the factory with the following configuration: 6.5 power valve 67 main jets and 76 secondary jets .073/.039 idle air bleeds .028/.028 high speed air bleeds I started out by dropping the size of the main and secondary jets by 2 down to 65/74. When I pulled my plugs after 50 hours, it was obvious that I was running rich. Black, sooty plugs. Not oily, just soot. My question on the spark plug heat range is based on the carbon/soot issue. If someone wanted to purpously run a bit rich, would a one-level hotter plug be OK or would it cause any problems? The reason for my question, is that I take the boat down to Lake Powell every year, and the elevation there is 3,600 feet. That could be the reason for the soot build-up on the plugs. The great thing about Fuel Injection is the automatic adjustment for elevation. My automatic elevation adjustment includes a new gasket and carburetor jet changes. Not that this is a huge problem, but I would rather not have to open up the carburetor before heading down to Lake Powell. If the 765 plugs solve the soot issue without causing unwanted side effects, then I MAY consider. If not, I'll just stick with the tried-and-true 764 plugs. At the end-of-season lay-up, I changed the jets to the next smaller size. Now it is 64/73. I did also buy the next 2 sizes of air bleeds. I haven't yet experimented with the air bleeds, as I first want to see how the new jets perform. Additionally, at my altitude, I don't swing a standard wheel (ACME 422). Instead, I run an ACME 654. The 2 wheels are very similar, with the 654 being 1/2" less in pitch. This combo of carb configuration and prop seems to work well at my altitude. With 3 people in the boat, I can turn 5,000 RPMs and run 43 MPH. JQ |
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Current
2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
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backfoot100 ![]() Platinum Member ![]() Joined: January-03-2007 Location: United States Status: Offline Points: 1897 |
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OK, I think I got it now. We may have been using different terminology for the same thing. The pic you posted at the start of the thread is for the PCV then or the breather? I was using that as a reference and thinking that is what you were calling the breather. I was thinking it was the PCV. Here is a pic of my setup. PCV on the left attached to the base of the carb. Breather on the right that looks like a mini air filter. ![]() Think of it like one side is intake (Breather) and the other exhaust (PCV) for the crankcase. As long as your breather isn't restricting the PCV airflow it'll be fine. Your setup is using the flame arrestor as the air filter (for lack of a better term). If that's the case, it probably does look like the PCV. You could certainly replace it with something similar to my setup but it isn't necessary. .45" plug gap is fine. I'm not sure what others with DUI are running. Where there any recommendations with the DUI? From what I found online, if you have the high voltage coil, .55" isn't a problem. |
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When people run down to the lake to see what's making that noise, you've succeeded.
Eddie |
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lakedog55 ![]() Gold Member ![]() Joined: November-11-2010 Location: Lake Weir Fl Status: Offline Points: 835 |
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Eddie,
It has a hose attached on rear of intake manifold to the pcv valve on opposite valve cover. Wont harldly run without it This hose not sure what it does if anything.Maybe I should look into another solution for it. The old arrestor was done same way from factory. Plug gaps are at 45 maybe I should go a little more? |
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Lakedog55
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backfoot100 ![]() Platinum Member ![]() Joined: January-03-2007 Location: United States Status: Offline Points: 1897 |
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Yes, you don't want to disconnect that hose. That's providing a positive suction in the crankcase aka...PCV. That hose is usually run to a vacuum port on the base of the carb or the carb adapter if so equipped. That's where you're getting the greatest vacuum signal from the engine. Some have tapped into a single runner on the intake but debates have been plenty about how effective that is. Either option would have to be better than being on the flame arrestor but I have seen them that way more than a few times too. Maybe someone else might confirm/deny that to be sure.
Interesting to hear this Rob. Every person that has installed a QF carb has had nothing but praise for it, yourself included. Pretty much bolt it on and go. What altitude are you running at? Higher elevations could certainly explain a rich condition that needs attention. Heat ranges of plugs takes a lot of things into consideration. Compression ratios, gas quality, elevation, A/F ratios, timing advance, overall engine use (excessive idling or under heavy loads),etc. The list goes on and on. Getting the carb tuned properly is much more important first IMHO. However, I firmly believe that using the recommended manufacturer and heat range plug is vitally important before you start tuning that carb. Our classic, old school, OHV, pushrod, Detroit iron have ignition systems designed to run plain old cheap, copper core plugs that you can buy 8 for the price of one Platinum, Iridium, Plutonium or any other plug that ends in "ium". You're wasting your money and loosing performance. Even new DUI and MSD ignitions recommend using those same cheap copper core plugs with the only difference being the gaps.. At least mine does. Don't mess with that. Make sure that when you start playing with the jets and/or air bleeds, change just one at a time. then test on the primaries like Tom recommended before doing anything else. It's time consuming and uses a lot of plugs but can be well worth the effort. If you're running as rich as Mike is, you're losing quite a bit of performance potential |
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When people run down to the lake to see what's making that noise, you've succeeded.
Eddie |
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lakedog55 ![]() Gold Member ![]() Joined: November-11-2010 Location: Lake Weir Fl Status: Offline Points: 835 |
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Eddie,
764's on plugs and yes to the hose from carb to breather. Or does that affect vacum? |
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Lakedog55
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lakedog55 ![]() Gold Member ![]() Joined: November-11-2010 Location: Lake Weir Fl Status: Offline Points: 835 |
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JQ,
I did change squirter sizes to a larger size. At first had a stumble, turns out front float was low. May have to change that back. One other thing when I first installed carb I used the ground that it came with. Not good. When throttle linkage passed by it made a definite spark. Luckily it was getting late when I installed it so i could see the blue flame So if you used the stock one with aluminum intake you might give it a look. |
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Lakedog55
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