rd 400 not running right

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rd 400 not running right

 my rd 400 has had swarbrick racing pipes foam filters and bigger main jets put in, but it will not rev past 4500 revs , it starts great no rattles or bad low down noise. in  need of help.please.

Have you done a plug chop, could be running rich and the jets may be too big. This will stop it revving out and you may have to drop down your jet sizes


Get onto the rd air cooled forum or the rdlc crazy forum. Loads of advice available over there

Sounds like it is running too rich, plug chop is the way to go. Try choking it, if it gets worse, definately too rich.

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