QuestionI'm in the process of restoring my 1967 CL90, but it has been sitting for a while and the throttle does not move very much. I suspect a gummed up carburetor.
Is the throttle cable attached to a slide that is supposed to come out?
What is the best product to clean up a gummy carb?
I do not wish to force anything, as the parts are hard to find.
Thank you in advance for any help.
AnswerRichard, Wisely you know not to force things.... Get some spray carburetor cleaner at the auto parts store and spray both sides of the slide from the air cleaner side and the manifold side. If you can get the top off the carb, just a little spray more cleaner down the insides of the slide and carb bore. Let it sit for a minute or two and using a hard piece of plastic, try to gently lift the slide out from the air cleaner side. That side has a cutaway and will give you a small place to try to move it. Do not use any metal items, like a screwdriver or small punch as the slide is either chrome plated brass or aluminum.. very soft material.
Sometimes the carb slide needle will get gummed up in the emulsion tube, so remove the float bowl and remove the jets and main jet holder (7-8mm wrench, usually or use a baby crescent wrench) and spray some cleaner up inside the needle recess area. When you get the parts cleaned up check the float for pinholes, which will make it sink when you reinstall it. The idle jet can be damaged if you don't use real sharp fresh screwdrivers of the proper width.
You can probably get a KEYSTER carb kit from Ebay for it and the distributor Sirius Consolidated now has floats for many models.
Your carb looks pretty much like this...
http://www.dansmc.com/carbs/Japanese_Carbs/Keihin_Type1.htm
Once you get the slide pulled free from the carb body, you can push the spring down enough to release the cable from the slide and proceed to clean everything thoroughly. Yamaha makes a good carb cleaner product FYI...
Bill Silver
