Starting Point for Jets

Location
MT
Need help with this new engine....

800 sxr cylinder on 750 sxi pro case. Recreational freestyle porting by blowsion. Running a JSU girdled head with 28cc domes and a factory dry pipe for the sxi pro.

Stock mikuni dual 44s. Factory pipe recomends 170 front and 172.5 main jets and recommend stock pilot jets. I am running at 3250 feet however and with these mods dont really know a good starting point. Factory pipe said they would not make any recomendations.... Please help!!
 

tom21

havin fun
Location
clearwater FL
yeah they are very helpful- I love that tech lady. I am in the same boat cept the head. the stock jetting hits about as hard as stock. If I ever get a second to get to watetest again, I will let you know what I come up with.
 
Location
MT
also forgot I am running 5 degrees timing advance. any ideas how to adjust jets for altitude though. is there some formula like go down so many jet sizes per every 1000 feet of elevation?
 
Location
MT
yes you have to lean it out for the altitude because there is less air. Im going to try 142s this weekend and see what happens...
 
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