raptor jetting with a yoshimura full exhaust with tec kit - Yamaha ATV Forum
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post #1 of 3 Old 01-08-2005, 12:01 PM Thread Starter
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Join Date: Mar 2003
Posts: 12
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!!
darrengee is offline  
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post #2 of 3 Old 01-08-2005, 12:11 PM
Join Date: Dec 2004
Location: San Diego, CA
Posts: 88
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.

2005 Raptor 660
-Motion Pro twist throttle
-Yoshimura stainless full exhuast
-Proflow foam filter running no lid
-160/165, 25 pilots, 3 and 2 1/2 turns
Runs awesome. Enough power for now.
Glamis and Ocotillo Junkie.
michaelbrenner is offline  
post #3 of 3 Old 01-10-2005, 07:58 AM
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Join Date: Mar 2004
Location: Kansas City
Posts: 586
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.

2004 Raptor
Rappy77 is offline  

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