Its true. I installed the GYT-R slip-on plus the Pro Design foam filter kit, then took it to Dynojet here in Las Vegas where they jetted and Dynoed it for me. 42 HP is the outcome. I do believe Dynojet is a wonderful investment for anyone. [img]i/expressions/face-icon-small-smile.gif[/img]

 

What did it cost to have them jet and Dyno your Raptor? Jetting can be such a pain, what a great solution, and with real, documented results, not just seat of the pants. [img]i/expressions/face-icon-small-cool.gif[/img] I smell a road trip to Vegas....

 

What was the jetting they ended up with?

 

42 seems a tad on the low side.

 

How many times did they change jets / adjust needles in search of the most power? I have "read" that a slip on and dynojet chime in at mid-high 40's.

 

I usually see 45-48 with a slip on, jets and a cut air box. 42 is low.

 

what is stock hp? Not Yamaha advertised hp, but actual observed...

 

Wow! So with those few mods you increase your hp from 35 to 48. Ummm,okay. Yeah, I drilled some holes in my AC 250's airbox and took the hp from 8.6 to 100 hp.

 

Corndog, You must be some back woods rocket scientist.

Stock Raptors hit 35-38hp by my observation. With a GYTR tip, needles, jets and the air box lid removed, I get 48 without a problem. Add a cam with the stock piston and 52+ is there. Perhaps you fail to understand that the Raptor is substantially restricted in stock form (perhaps because Yamaha does not want to sell something fast to someone like you -- for the safety of others). The horsepower gains are common knowledge and not wishful thinking.

Add a cam and 102mm piston with proper porting and you get over 60hp. Go with a 105mm piston and you easily get 70. Work on some carbs and cam specs and 75 is easy. Add a 4mm stroke and 80+ hp is reality.

 

Raptor720...Do you have to resleeve with the 102mm and 105mm piston? Is it safe to say that you are talking about a 680 and 720?