I have noticed on a 618 at idle(2300)  there is a slight shudder I've varied the rpm slightly to 2500 and it's almost completely gone  coolant temp at 150 thru out these test

the set up has a 3 blade warp drive 2.6 to 1 belt reduction   2200 is really shaky  I have applied just a slight bit of enricher it get worse 

my thought is drop the idle jet one size  but the rpm at 2300 might be to high on the needle to be effective


You do not have permissions to reply to this topic.