Mm 700 Power Inc jetting for 8,000-10,000ft.

[Mountain Mod 700]

I have a 2000 MTN Max, ported and polished engine with power inc end dump pipes and air box mod. I know these pipes run at 8500 rpms. I need an idea for jetting at 8-10k feet. I tried 138.3 PTO and 140's but won't pull the rpms, I tried nocking weight out of the primary but didn't change the rpms. Need some advice.

 

[Maim]

what do the plugs look like at rpm?

 

[Mountain Mod 700]

what do the plugs look like at rpm?

The plugs are dark brown.

 

[A couple of bucks]

A small amount of info.

https://www.snowest.com/forum/archive/index.php/t-177690.html

 

[Maim]

a touch ritch but not too bad. reeds are in good shape? air box all stock?

 

[Mountain Mod 700]

a touch ritch but not too bad. reeds are in good shape? air box all stock?

I have the air box mod, holes in the mid plate. And the reeds are good.

 

[Maim]

primary spring might be too stiff for your clutching. i am by no means a clutching expert but it might be asking for a softer spring. are you using power inc clutching reccomendadions as a base without the porting?