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Originally Posted by joe509
my bike runs perfect no missing i dont want to mess something up! my only concern is above 7000 rpm it just strugles to increase in rpm it will do it but takes a long time around 7400 rpm there is a intermitent miss i think the exhaust is restrictive! the end of the muffler is welded so you cant remove it easily! i wonder if opening it up larger would help? thanks for your reply joe
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Yeah I think the bikes are set up for whatever altitude they are assembled at then it
might or might not change depending on the altitude you live at and of course air density.
One way of opening up the exhaust is to drill holes around the circumference of the smaller inner pipe at the end of the muffler.
However this usually leans out the bike and you could either move the needle lower in the carb or go up on the fuel jet size.
Sounds like your bike is almost there as is, the slight miss at top end suggests you could move up the fuel jet one or two numbers to straighten it out