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Altitude jetting

4K views 5 replies 5 participants last post by  acecarlos 
#1 ·
Hey guys, new member here. A few months ago I purchased a 88 trx250r. Only mods it has (as far as I can tell) is a KN filter, and FMF header and pipe. It was jetted for sea level, took it to Winchester Bay, OR and it ran great. I live in Nevada (Reno area) though at 4600ft elevation. I just pulled the main and pilot jet, main is a 158 and pilot is a 55 for sea level. Any recommendations on where to start for both jets with an elevation of 4600ft?
 
#4 ·
Higher altitudes require higher compression and leaner jetting for top performance. If you don't increase compression, at the very least at 4600 FT Lean your jetting out one jet size for every 1000/1500 FT increase or per the refference Matuus provided.

Carlos
 
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