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Discussion Starter · #1 ·
First off I am brand new to this forum and I want to say what's up to all the 250r guys out there! :D I have built several 250r's from the frame up and I just completed another one. This is the first 1 that I've ever had that I can't rebuild the carb, set the float, tune it and go. The feul continues to overfill the bowl no matter what I do. I've been a mechanic for 12 years now and there is just about nothing I can't fix but this thing and I'm through with it :angry: . So as far as upgrading my carb. I just rebuilt the engine witha 1mm over wiseco piston, rings, gasket set, ect.. I haven't even brooke it in yet. I'm getting 175 psi of compression with the engine stone cold and not fired up yet. The cylinder was in good shape so I just honed it to help the rings seat in properly. I;m assuming the ompression should be a few pounds more once it breaks in and it's warm so I think everything with the engine is in order. I have a DG chrome plated expansion pipe and an FmF powercore with it. K&N filter, modded box. Nothing special.

The PJ doesn't appeal to me because as you know it has an integrated choke circuit. I like having seperate air and idle adjustments and not just 1. I am looking at the Keihin air striker in the 35mm or the Mikuni TMX in the 36mm not the 38. The reason is that the bike should be fast enough for me if it just ran correctly. Also I do allot of trail riding in slow sections and keeping the plug nice and tan is a big priority, if at all possible. I don't need too much feul. I also don't want to modify or change the intake boot or air boot if possible. The air striker seems to be all about top end. Top end is nice when I get to an open stretch but mostlky I'm stuck in second gear. I've read the Mikuni has excellent throttle respoonse which really appeals to me. It comes stock on 05+ CR250's in a 38mm but it has a tps and a better electrical system. I was thinking the 36mm would be good for me. Is the Mikuni hard to tune? Harder to rebuild even? I just think it cool to update or retromod anything late model with early model parts. The Mikuni seems to be the most advance carb you can get but is that NOT as nticable w/o having a tps sensor I wonder. Is it more trouble then it's worth considering I don't have a 310cc or power valve motor? What carb should I replace my stcock carb with and what size? Thanks in advanvce!
 

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most guys run the A/S keihin. the keihin seems to be easier to tune, and more widely available. i had a TMX on my CR and ditched it in favor of the keihin 38 A/S. i dont think theres anything in particular thats wrong with the TMX i just like the keihin better.
 

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Discussion Starter · #3 ·
So you didn't see much difference in throttle response with the TMX? As far as the size goes with the mods I mentioned. IS the 35mm air striker the way to go? Or can I run a 38mm with out fouling plugs every ride. It's hard for me to believe the PJ is still so popular with Banshee riders and especially Blasters after all these years. Is the integrated choke circuit just NOT an issue? If not can I get a new PJ cheaper the an Air striker. New air strikers are only like $175 on Ebay. About the same as a TMX it looks like. Will the Keihin's all bolt up as long as they're under 36mm? That's the big question for me. I'm clueless with the Mikuni. They look like a real pain to bolt up. I mean I can change my carb out in probably 12 minutes I've done it so many times now but that's because it fits the boots. I don't want to get into the $300's with intakes and adapters if I can avoid it. I finally got some pics up. Nothin' special but not too bad for an 85'
 
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