c. wilson Posted July 5, 2007 Report Posted July 5, 2007 Hey all... I'm sort of a newb to the forum (lurked on and off for years). Thanks to the powers that be for a great site! Situation: Moved from Southern California to Idaho. So, changing from Glamis to St. Anthony. From near Sea Level to about 5000' from what I've read. Question 1: My wife's bike is 100% stock. Does Yamaha jet the bikes differently for where they sell them (say California vs. Idaho)? Instead of rejetting hers I'm wondering if I just added an intake w/K&N if that would do the trick or if I even need to do anything at all. Question 2: My bike is very mild (K&N in the stock airbox, lid on, snorkle off, FMF fattys, TORS elim.). Is there anyone who can give me an idea of where to start on the rejetting for that altitude? I've checked out the altitude chart but was just wondering if anyone already has a similar set up at a similar altitude. Thanks!! Quote
dajogejr Posted July 5, 2007 Report Posted July 5, 2007 1. Yes. Stock is 200 main jets. Depending on where you buy them from...locale wise, they could come with 190 to 220 from what I've seen. Lower numbers for higher elevations and higher for colder temps, lower elevations. Never do mods to fix your jetting...you'll get burnt. Either do the jetting correctly for how the bike is, or do the mods then jet it correctly. Please don't use mods in the place of proper jetting. I had a friend that used to mix more oil in the winter "to be safe" When I told him that makes a lean bike run leaner (more oil in gas, flows through carb/jets slower) he didn't believe me. After three years, three top ends and a crank...I made him and his wallet a believer... 2. At 5000 feet elevation and your mods, I"m taking a WILD guess and say 220 to 230 main. At 5000 feet, it would be in a great interest to you to raise your compression as well...either by milling the stock head, or by purchasing an aftermarket head with smaller domes. At 5000 feet, even when properly jetted ...your bike will feel like it probably lost 20 to 30% of it's power compared to sea level. You probably lost 20 to 30 PSI of compression from that elevation climb... Welcome to the HQ.... :thumbsup: Quote
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