O.K. ATV buffs....my stock Raptor does about 75mph. I want to be able to hit 85mph. What mods do I need without going to the extreme (in the engine). Is that possible? If not... I think I'm going to the YZF426. Thanks for the help....

j/t
01 Raptor Blk/White (stock

Very small rear sprocket [img]i/expressions/face-icon-small-smile.gif[/img] hehe


Hey check out https://atvconnection.com/ the best site on the net for ATV information.

use larger rear tires you will pick up maybe 5mph on top.

Or drive off a big cliff. It should accelerate to 85 mph rather quickly.

Piped, jetted, opened air-box and a 16 tooth!!!?

I dont think it is possiable without going into the engine. I have a full BG exhaust, Pro design filter kit and a 14 tooth front. Mine has gone as fast as 81.2 mph. It may be possiable though with a 14 tooth front and a 34 or so rear sprocket. But id have to see it before i believed it.Dont try to pick up speed with larger tires, it will take a considerable bit more engine power to turn a set of 22in tires than the stock 20s, especially at 75+mph. I sould suggest the standard mods with a combination of gearing experimentation. Also try getting a set of smallet front tires, remove all unwanted weight, bumpers,skid plates,ect.Front fenders catch a lot of air at high speeds, so you may want to trim those. After that it may be possiable to hit 85 mph on a cool low humidity day.

Well, I'm not hitting 85, but I just took a GPS reading and I hit 75.7 mph. No big deal you say? Continue reading. I think it's pretty good considering that I've got Holeshot XCT's 6 ply 23" & 22" tires (filled with nearly 16 oz. of tire Slime in each one.) Full aftermarket skids, and 220 lbs. of fat me on it. Also, I'm geared down from stock. I'm running a 12 tooth front and a 43 tooth rear.

Oh, I'm running stock exhaust also. I have 2 holes cut into my airbox lid and am jetted at 150-155 with 25 pilots. Needles are raised as high as they will go (furthest position from top groove).

With factory tires and a 14 tooth front, stock rear, I think I'd be flirting with the 80's fairly strong. What do ya think?

That sounds pretty accurate to me,considering the added weight,taller tires and and in the fact that you are a pretty big boy that sounds pretty strong.

No2StrokeBs,

Yes, I had to do something. A buddy with a DS beat me repeatedly in a drag, so I figured it was time to get my jetting dialed in.

I tried 106/165 jets, everything else the same as the current recipe, but it did't feel any stronger on top end and it had a bad surge at part throttle, so I went back to the 150/155 combo.

Thanks for all the positive input everyone.

j/t
01 Raptor Blk/White (stock)