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Idle ? Carb Problem |
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jterr 
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Joined: February-13-2018 Location: N. Florida Status: Offline Points: 621 |
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 Topic: Idle ? Carb ProblemPosted: August-11-2020 at 2:11pm |
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Finally got my 83 in the water after 21/2 years working on her. SN 351 PCM :
I'm a true backyard mechanic and can do some things but this carb may be a bit over my head.
Issues- 1-I can't get the idle just right. Cranks up after a few tries and have to keep the gas till it warms up(seems to idle better). After getting out on the lake the motor runs great, about 160 degrees. When in Neutral idle was 1000 rpm's which I think is high. 2-After running around the lake for about 45 mins decided to head back, crusing along motor seemed to run out of gas. After a few cranks and pumping throttle at carb got cranked up and made it to ramp, then the idle issues started up. soon as I would take out of gear to neutral it died and would crank back up but couldn't make idle. Lost; any suggestions Thanks JT |
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Jonny Quest
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Joined: August-20-2013 Location: Utah--via Texas Status: Offline Points: 2978 |
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Posted: August-11-2020 at 3:31pm |
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Do you rebuild the carburetor? If not, when was the carby last rebuilt? What are the idle mixture screws set at (# turns out from lightly seated)? Have you adjusted your float level in the float bowls? Do you know the fuel pressure from the fuel pump at the fuel inlet? How old is the fuel pump?
These items can have a significant impact on how the carburetor is functioning. For a carburetor to work properly, there are several factors that have to be working together and not against each other. JQ
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2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
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jterr
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Joined: February-13-2018 Location: N. Florida Status: Offline Points: 621 |
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Posted: August-11-2020 at 4:39pm |
Rebuilt- yes Idle screws -I thnik 1 1/2 tuns?? Floats -when I did rebuild last year Pressure- don't know that Fuel pump- Had a electric that went bad so cleaned up original and when I put new fuel sender, hoses, and filter.
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dgabler
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Joined: June-12-2017 Location: Atascadero Status: Offline Points: 71 |
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Posted: August-13-2020 at 12:36pm |
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So silly thing that happened to me. The PO who rebuilt the carb ended up Hooking the throttle linkage springs up wrong. The spring was pulling the butterfly closed vs open. This caused innumerable idle problems for me. My suggestion here would is to Check and make sure the springs are correct.
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KENO
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Joined: June-06-2004 Location: United States Status: Offline Points: 11112 |
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Posted: August-13-2020 at 1:06pm |
Kinda a silly thing but the job of the spring(s) are to make sure the butterfly(s) close, not to keep them open  The throttle cable has the job of keeping them open against spring pressure, whether it's the spring on the throttle shaft or the separate spring that hooks between the primary linkage and a mounting spot on the engine. Otherwise, you break your throttle cable and ................hang on we're off to the races at full throttle.
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jterr
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Posted: August-13-2020 at 1:13pm |
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After a phone call to Rob , I called Holley and found that I used the wrong rebuild kit plus it had sat for about a year . Ordered correct kit and will update later.
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: August-13-2020 at 1:21pm |
Or the brass pivot pin wears out. David, You like fast don't you.  Seriously, if you are having carb problems, don't blame the spring. Tell us what's going on and I'm sure we could help.
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dgabler
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Posted: August-13-2020 at 3:25pm |
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Oh my. I realize what I typed in there! I need to peek now at my carb spring setup and rethink everything.
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dgabler
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Posted: August-14-2020 at 7:45pm |
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Sigh. I was mistaken again. The PO has the carb springs setup in “go fast mode” I flipped it to safe and sane mode. Thanks for calling me out on it. Regardless, the wrong spring setup caused me idle issues so my advice of checking the spring still stands, spring location, that is another story ;)
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KENO
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Posted: August-14-2020 at 9:05pm |
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I kinda figured you had it right physically and just mixed up the description, especially after looking at your old posts today and finding the thread in the link below It doesn't have pictures any more, but it tells me that you found it wrong and fixed it back then. So..........good job back then and verifying what you have now too |
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Jonny Quest wrote: