Hi could anybody give me an idea of what might be happening to cause the rear cylinder to run extremely week above 10,000rpm.
Just had the bike on the dyno and the front/right cylinder was running ok through the rev range apart from some tweeking to get it spot on but when testing the rear/left it would be ok to about 9000rpm and the suddenly just go off the scale running lean.
Now i know it is a very vague question but any hint would be useful. My first job is to check the float heights and for any debris or blockages but is there anything else likely to cause this? Jetting wise the rear is 2 sizes bigger on the main jet and the power jets are still fitted.
Cheers
Mark
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MC21 300
Aprilia RS250 track bike