Question about 1972 Yamaha XS2
Posted by Anonymous on
Hi, Anonymous and the usual suspects are:
1. Inlet system air leak.
2. Enrichener valve not seated or leaking.
3. Damaged or restricted fuel tank vent system.
4. Restricted fuel supply tract.
5. Dirty or damaged air cleaner element.
6. Plugged bowl vent or overflow.
7. Worn or damaged needle or needle jet.
8. Vacuum piston assembly malfunction.
9. Loose or plugged main jets or passages.
10. Improper float level.
11. Accelerator pumps inoperative.
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Posted on Dec 22, 2016
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Posted on Jan 02, 2017
SOURCE: Yamaha banshee. Just rebuilt top
Check the plug color to see if it is normal. I would put new spark plug caps and new spark plugs on the machine and see if that helps . From what you describe , if the spark plug caps do not work , you will probably have to either , adjust your air screw setting or change your pilot jets up one size to compensate for the other changes.
Posted on Aug 17, 2010
SOURCE: I have 1979 yamaha GT
Running with the choke on is a classic indicator that the pilot circuit in the carb is too lean. Richen your pilot (low speed) circuit (the small jet in the bowl) by replacing it with a larger jet. Keep in mind I am not familiar wih this exact bike but I believe the advise to be solid.
Posted on Sep 10, 2010
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