High Idle

Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic

   Thanks for the tips everyone.  I have been just going into and out of gear in no wake zones.  I have my timing at 12 to 14 btdc because if I retard the timing to 10 btdc, then I have a misfire under acceleration.  I'll just let it be at 900 rpm or so.  Thanks everyone.  

Author	Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic
Siveck Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: March-14-2005 Location: Birmingham, AL Status: Offline Points: 100	Post Options Post Reply Quote Siveck Report Post Thanks(0) Quote Reply Topic: High Idle Posted: August-12-2005 at 12:30pm
	Thanks for the tips everyone. I have been just going into and out of gear in no wake zones. I have my timing at 12 to 14 btdc because if I retard the timing to 10 btdc, then I have a misfire under acceleration. I'll just let it be at 900 rpm or so. Thanks everyone.
	1975 Ski Nautique "Small Letter Boat"

79nautique Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: January-27-2004 Location: United States Status: Offline Points: 7872	Post Options Post Reply Quote 79nautique Report Post Thanks(0) Quote Reply Posted: August-12-2005 at 11:26am
	Running at 900 is about what mine likes to idle at. With the cam it needs a little more rpm at idle. A couple of suggestions for the no-wake zones, go a lot slower by going in and out of gear and I have also changed my prop to bring down the rpm's on top end bbut it also help the idle speed by having a slightly heavier load on the drive-line due to the increased pitch dropping the rpm down more.

southwind 20 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: August-08-2005 Location: United States Status: Offline Points: 30	Post Options Post Reply Quote southwind 20 Report Post Thanks(0) Quote Reply Posted: August-12-2005 at 2:33am
	Just a thought, but setting the timing at 12 degrees instead of 10 will increase the idle speed at least on and automotive set up so you might try going back down to 10 and see what happens.
	Git One ON!

Siveck Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: March-14-2005 Location: Birmingham, AL Status: Offline Points: 100	Post Options Post Reply Quote Siveck Report Post Thanks(0) Quote Reply Posted: August-03-2005 at 5:35pm
	It's actually smooth when it goes into gear. Maybe my tach isn't accurate. Oh well. It will be a mystery that I can live with.
	1975 Ski Nautique "Small Letter Boat"

stang72 Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum Member Joined: July-31-2004 Location: United States Status: Offline Points: 1608	Post Options Post Reply Quote stang72 Report Post Thanks(0) Quote Reply Posted: August-03-2005 at 4:11pm
	Oh..forgot to metion...There was one other thing that we did that helped fix the prob....we retarded the timing a bit!The leak was the main offender though.
	stang Face plants are not that funny when it's you face! The Super Air

stang72 Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum Member Joined: July-31-2004 Location: United States Status: Offline Points: 1608	Post Options Post Reply Quote stang72 Report Post Thanks(0) Quote Reply Posted: August-03-2005 at 4:07pm
	I was having high idle probs too...after going through a bunch of ajustments(carb,timing and ignition) I found a vacume leak...problem solved! I found the leak by blowing cigarett smoke arround the carb spacer...it sucked it right in at one spot.I now idle at 600 rpms and it is as smooth as a babies behind! When mine was fast... I was told by the lake patrol to slow down...so I know what you mean! If your idle is too fast...it will take a toll on the tranny...it should be smooth going into gear ...it would be best to find a fix!
	stang Face plants are not that funny when it's you face! The Super Air

Siveck Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: March-14-2005 Location: Birmingham, AL Status: Offline Points: 100	Post Options Post Reply Quote Siveck Report Post Thanks(0) Quote Reply Posted: August-01-2005 at 2:56pm
	I checked for vacuum leaks with carb cleaner on the intake around the carb and such and found none. I just changed the pcv valve and it is still the same. And still yet the same when I unhook the pcv valve and run it with the vacuum guage attached to the wedge plate port. It runs very well, but the idle is a bit high. I guess that I will just live with it. It's not so bad that it would tear up the transmission, so I'll just let it be. Maybe my cam is supposed to make the motor behave that way. The power is definitely awsome. Thanks everyone for your input.
	1975 Ski Nautique "Small Letter Boat"

JEFF KOSTIS Members Profile Send Private Message Find Members Posts Add to Buddy List Gold Member Joined: April-19-2005 Location: United States Status: Offline Points: 817	Post Options Post Reply Quote JEFF KOSTIS Report Post Thanks(0) Quote Reply Posted: August-01-2005 at 12:12am
	Does it have a PCV valve? Defective?
	MUSTANG COUNTRY 1974 Mustang 17 1976 Mustang 17

83sn2001 Members Profile Send Private Message Find Members Posts Add to Buddy List Guest	Post Options Post Reply Quote 83sn2001 Thanks(0) Quote Reply Posted: July-31-2005 at 5:21pm
	Check for leaks around the intake and vacuum fittings as well as the carb.

64 Skier Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: February-08-2004 Location: United States Status: Offline Points: 415	Post Options Post Reply Quote 64 Skier Report Post Thanks(0) Quote Reply Posted: July-31-2005 at 5:47am
	My boat is the same (cam w/incresed compression and no idea where the timing should be set)....after getting her running, we experimented with the timing (while running in the lake with and without a load) till it started smoothly and accelerated without knocking. Sorry, can't remember which way we went! Let us know what happens and good luck.
	64 Skier 66" HO VTX and 67" HO Triumph 71CC

Jim_In_Houston Members Profile Send Private Message Find Members Posts Visit Members Homepage Add to Buddy List Platinum Member Joined: September-06-2004 Location: United States Status: Offline Points: 1120	Post Options Post Reply Quote Jim_In_Houston Report Post Thanks(0) Quote Reply Posted: July-31-2005 at 1:14am
	I know you checked for vacuum leaks but that is exactly what it sounds like. I found my vacuum leak by spraying WD40 around the carb base. The idle smoothed out instanty upon spraying and then wne back to high and rough. The carb gasket, a cheap Mr. Gasket, was leaking in a very small spot - about 1/2" long.
	Happy owner of a '66 and a '68 Mustang

Siveck Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: March-14-2005 Location: Birmingham, AL Status: Offline Points: 100	Post Options Post Reply Quote Siveck Report Post Thanks(0) Quote Reply Posted: July-29-2005 at 12:20pm
	I finally have my boat to where it runs again after a long summer of working on it as usual. However, my idle speed will not go below 900 rpm or so. I've rebuilt the carb, made the adjustments, and have the timing set at about 12 btdc at 900 rpm. I figure that should be close at the spec is 10 btdc at 700 rpm. I hooked up a vacuum guage and I am getting 18 in Hg steady at this rpm. If I go any lower, then it surges and dies. I checked for vacuum leaks around the carb base and found none. It was running rich, but I found that the accelorator pump was slightly actuated at idle, so I adjusted that. I do have a mild cam in the boat, but 900 rpm still seems a bit high. And yes, people shake their fists in the no wake zone. I've had this boat for over a year and have never seen it idle below 900 rpm. Any ideas? Maybe the tach isn't accurate. The idle sounds fine, but the guage shows high. I am at a loss with this issue.
	1975 Ski Nautique "Small Letter Boat"

High Idle

About CCF

Donate

Partners

Contact