jgreg53 Posted April 2, 2019 Report Share Posted April 2, 2019 It seems i have to keep tweeking the fuel/air mixture on my p15 to get the idle to smooth out. Any ideas? Quote Link to comment Share on other sites More sharing options...
sser2 Posted April 2, 2019 Report Share Posted April 2, 2019 Use standard carb adjustment procedure. There are two adjustment screws in a typical carburetor, speed and mixture. Set speed screw so that engine idles smoothly at lowest speed. Then adjust mixture screw to highest idle rpm. Go back to speed screw and re-adjust it again for lowest stable idle speed, then again mixture screw to highest speed. After doing this 3-4 times, both screws will be set to their optimal position, and idle speed should be within specifications. Quote Link to comment Share on other sites More sharing options...
jgreg53 Posted April 2, 2019 Author Report Share Posted April 2, 2019 Ok. Thanks Quote Link to comment Share on other sites More sharing options...
plymouthcranbrook Posted April 2, 2019 Report Share Posted April 2, 2019 Make sure that the mixture screw is not damaged. Some folks have a tendency to turn the screws in hard and then damage the tip. Hard to get a good setting if that happens Quote Link to comment Share on other sites More sharing options...
ptwothree Posted April 2, 2019 Report Share Posted April 2, 2019 Worn out throttle shaft bushings can cause this too. 1 Quote Link to comment Share on other sites More sharing options...
48ply1stcar Posted April 3, 2019 Report Share Posted April 3, 2019 (edited) Although, you may not has a issue that can be fixed with a rebuild. This is a good rebuild video. Also check for a air leak with a vacuum guage. There's a lot of threads about carb adjustments. Edited April 4, 2019 by 48ply1stcar forgot vieo Quote Link to comment Share on other sites More sharing options...
jgreg53 Posted April 4, 2019 Author Report Share Posted April 4, 2019 I've rebuilt it twice. The second time with a kit and video from mike's carberators. Quote Link to comment Share on other sites More sharing options...
48ply1stcar Posted April 4, 2019 Report Share Posted April 4, 2019 I just opened my rebuild kit from Mike's Carburetors https://www.carburetor-parts.com/ . I also rebuilt my carb two or three times last year. One of the kits from last year the gasket main throttle holes were too big, so I had to make my own gaskets. I think my problem all year was a air leak in the carb or manifold. Yesterday I made sure the float, floated. In addition to the carb kit I bought a new idle adjustment screw. Hope to clean and rebuild this weekend. Quote Link to comment Share on other sites More sharing options...
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