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raptor jetting with a yoshimura full exhaust with tec kit

This is a discussion on raptor jetting with a yoshimura full exhaust with tec kit within the Yamaha YFM660R Raptor (2001-2005) forums, part of the Performance /Technical category; Would the installation of a tec kit (quiet insert) in a yoshimura comp system require the jetting to be different? I realize that the tec ...


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Old 01-08-2005, 12:01 PM   #1
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Default raptor jetting with a yoshimura full exhaust with tec kit

Would the installation of a tec kit (quiet insert) in a yoshimura comp system require the jetting to be different? I realize that the tec kit restricts exhaust flow a little, but would it restrict it enuff to run smaller main jets? I followed the instuctions in dynojet kit for my application 146/148 at sea level, but I'm gonna add the tec kit before i put it all back together. Thanks for the help!!
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Old 01-08-2005, 12:11 PM   #2
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I think it may warrant a downsize of one size on the mains. My yoshi comp runs 165/160 but no tec and runs perfect! If I ran that quiet insert I would go down to a 160/155 to maintain the crisp pull in the midrange and topend.
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Old 01-10-2005, 07:58 AM   #3
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That may be right, I have never tried it. We have put quiet cores on the HMF on both a Rappy and a 300ex, and no rejetting was required. The jetting has more to do with the intake than the exhaust. I would throw the quiet core in, and try it b4 ripping the bike apart.
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