200x missing in the upper rpm's.

[3WheelsOn2]

I have a 1984 honda 200x, It starts first or secont kick every time. in the lower rpm's it's great, but lately when I get into higher rpm's it starts missing real bad and looses power.

Any ideas?

It has a new NGK in it, Air filter is clean and I cleaned out the carb right after I noticed it, no affect what so ever.

[3WheelsOn2]

It does burn oil, Not like a whole lot... but some. If that helps any.

[icp4life162005]

Have you put on an after-market exhaust or changed the air box in anyway? It sounds like your running lean on the top end.

[3WheelsOn2]

No aftermarket box, But I to run it with the lid off. I had a home made pipe on for a little while (wasn't a full system, just a slip on pipe were the can goes on.), was way to loud. I changed it back to the original can the next day and it didn't help much.

[icp4life162005]

put the airbox lid back on and see if its any better, if it is then your problem is jetting. You can also just do some plug chops.

[3WheelsOn2]

Ok, i'll try it and see what happens.

[3WheelsOn2]

I put the lid back on, that fixed it. I would like to run it with the lid off, Because it gives it better air flow, Will I need a bigger jet for it to run smooth? if so any suggestions on the size? it has a 108 main jet in it now.

[J.D.]

Just go up 1 size at a time and check your plug frequently to make sure you're doing it right.

[3WheelsOn2]

Thx for the help guys, one last question. Were is the best place to get jets... I'd like to get several different sizes not just one at a time.

[ATCR250R]

I am pretty sure dennis kirk sells them in five packs for that carb.