I have been riding my ds with hmf slip on and a K&N airfilter from Idle to about 3-4grand it runs great after that it just loses power just like it bouncing of the rev limiter. I have 200 main jet air screw 2.5 turns out and the clip closest to the tip on the needle. I pulled the plugs today and they are really light tan or almost white. Do I have to go bigger with the main jet?I only trail ride with it and once and awhile race my buddies. I ride 99% in northern Mn any help would be great thanks to all

 

whats your elevation?

 

Sorry about that my elavation is 980 ft

 

i am at about 700ft elevation, i ran my stock carb almost identical to your set-up. the only thing i had different was i had a 185 main , and it was a little rich........i suggest u drop down to at least a 190 or 185 and see if your power increases and then u can jet up or down from there.

 

I'd say if youre running with lid/snorkels on about a 170, if lid is off about a 185.

 

IF I have a 200 main jet in it now and its lean in the mid to upper wouldnt a smaller main lean it out more?

 

how do u know its lean?

 

I am not sure but by looking at the plugs they were very light tan almost white meaning lean I thought

 

White = lean.

Tan = good.

Black = rich.

 

so if I went down to a smaller main jet I would be leaning it out more. How much bigger do they make the mikuni main jets. Thanks for all your help and quick responses