Posts
187
Joined
2/10/2012
Location
Elwell, MI, USA

Im no longer a 2 stroke wizard or maybe i neve was i use to build pipes and port cylinders for sleds . But i got a request to work on this 2017 250sx and performed some simple changes in the porting i always have had a diferent aproach to shaping an exhaust port even on the sleds and not letting the exhaust wave just dump into the port so with some advice on the transfers and my work on the exhaust port theses were the results i also increased compression by .5 .nothing else is done to the bike yet .the magazines say the bike hits to hard from the beginning of the curve my port work may have taken care of that i really would have rather seen it stronger but thats usally what happens .next step is put the rider on but dyno will tell the story and produce the final tuning .
Good work ron
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