mcx 270 nytro problem...HELP!!!

[JP270NYTRO]

ok so i rode my mcx 270 to day and it has a bad stutter at around 5000 rpm and when you let of the boost and get back on it... i read alot on this forum about this symptom but i tried everything i can think such asl changed plugs and gap plugs to .018 checked all boost lines for leaks there was non that i found... i changed the exhaust donuts and check the flex pipes there was no cracks...when is idles it goes from 1300 to 1600 up and down when it does this the vac and my fuel pressure gauge does the same goes up and down...could this be bad mapping? thanks

 

[ust421]

Sounds just like mine i called mark and he told me to check the wires going in the mcx box. All of mine look fine so we will see.

 

[JP270NYTRO]

yeah im not to impressed with this upgrade kit my 240 ran llike a beast last season...i paid for the upgrade and my boost went from 12 psi to 14 and my clutching is still spot on from my 240 kit doesnt seem right to me.

 

[ust421]

I was just riding in the big horns and i was seeing 16 to 17 lbs of boost. The sled is a blast when it is running right. I hit a rock so i am replacing my subframe and will be testing it again on the little snow we have here at home. If you have not called mark yet i would.