Question about Yamaha XT 660 R Motorcycles

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01 raptor 660,the pipes are turning red.i just put a used cylinder , wisco piston and cam in it. it has a factory air box a k @ n air filter and i put a pre oiled preoiled filter cover on it ????

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You have fuel burning in the pipe (unburnt in the cylinder and a leak in exhaust) or an incredibly lean mixture resulting in high exhaust temperature, would recommend that you 1st make your air fuel mix richer (worst that happens is foul plug) both in high and low speed mixture. This situation just happened to me after I started my 2003 polaris predator 500 after it had sat for almost three years. I managed to clear the varnish in the carb by cheating (not the recommended procedure but it worked) by draining fuel tank adding new fuel and stabil brand fuel stabilizer (it seems to help with old fuel and old suel deposits as well) and pulling air cleaner so that I could choke carb by hand and force a fuel draw. When she 1st fired up and I pushed the choke in I got a shock when I looked at the pipes and they were glowing cherry red. I began to fear for the safety of the exhaust valves and forced it to run in a very choked condition until the carb cleaned up a bit and it started to run rich and I could push the carb in a bit. hope this helps you out a bit, feel free to call me if I can be of further service 928-580-2298 Sean

Posted on Oct 09, 2009

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