I just rebuilt my 89 lt250r i put a pro design coolhead on,re-sleved it back to stock a wiesco piston and almost everything you could think of,but i still have the stock carb on it and in all the gears, in the mid to higher rpm's it bogs and spudders like crazy i know that i have to rejet the carb but should i go bigger or smaller on the jetting,is it running to rich or to lean,any help would usefull

 

I went to hell and back with my stock Mikuni, I finally smartened up and bought a Keihin Air Styrker 35 for $150.00, best money I ever spent. I must have dropped $30.00 in main, pilot jets and needles, but the thing always had problems somewhere. I got the AirStryker, installed it, did a plug check, looked good, and I have not touched it since.

 

Get the air striker carb it makes a hell of difference. I went with a 38 for my modified lt. Test your compression to see what size you need. You won't regret it.

 

Hey 2strokesrule can I get a Keihin Air Stryker for a Zilla if so can you direct me to a site to order it. Thanks.

 

http://www.hy-tech-atv.com/html/Order%20Page.html

This place HY-Tech has the lowest prices I have seen.

you will have to call them as I do not see and carbs on their web site but their prices are as follows.

Keihin PWK 38 AirStryker $169.00
Keihin PWK 39 $169.00

I have and AirStryker on my 250 and it is great, But for your 500 you should probably go with the PWK 39

 

I bought my Air striker carb from Hy-tech also. Nobody could even match their prices. Their # is (909) 794-5776