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Discussion Starter · #1 · (Edited)
Now it might be the speedometer app I used or it’s the machine I could swear I was in 5th the app said Top speed 57.2 but stock top speed is around 75 or so so how am I 18 miles an hour slower when I top out 5th gear it starts stuttering and loosing power over revving like you topped out your 4 banger Isuzu pup truck

This what I know it has

2008 yfz450 14/38 sprockets CT Racing exhaust k&n air filter I don’t think it has the full assembly 20” tires throttle limiter is let out quite a bit when open it up you can see a quart inch of the screw or so
 

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The app could be measuring the speed wrong. The cutting out and losing power could be the rev limiter kicking in or you're not getting enough fuel. What main jet are you running with the CT exhaust? Normally a FCI, exhaust, cam mod you;ll be in the 172+ MJ range, 4th clip on the NCQV needle, and a 48-pilot depending on elevation.
 
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