Question about 1982 Yamaha XZ 550
I have a 1982 xz 550 and it starts, but only with full choke and a little throtle. This puts it at about 4000rpm. I back off the choke to 2500rpm (about 1/2 choke) to let it warm up. As soon as I get it out of 3000rpm the bike rpms bounces up and down Sparaticly a moderate pace. I have no clue what to do.
some one told me it could be a line problem and to change the plugs .
The most common cause of this problem besides dirty carbs is a laeking YICS box. The YICS is the chrome covered box on the right side of the carbs. It is a dual chamber box designed to help "swirl" the intake gasses.
If one or both of the chambers is leaking the bike will "hunt" for an idle.
The fix is to carefully cut the box in half along its seam and make a gasket then seal the two halves toogether again with red RTV. Let it dry for 24 hrs.
A quick check is to hook up a length of hose to each port on the YICS and submerge it. Blow in each of the hoses. If air goes in one and out the other, you have an internal leak. If you see bubbles, you have an external leak. Either waym the fix is the same. See www.xz550.com for more info about it.
Posted on Jun 20, 2009
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Posted on Jan 02, 2017
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