My TTR125 has a Honda CRF150 carb that I put in there because the stock Mikuni is junk. The bike runs 100% better now. There is one small complaint that I have with the CRF150 carb: there is no good setting for the idle RPM. The problem is that if you set the idle screw so it idles at a nice reasonable RPM when the engine is cold, then once the engine warms up, the engine races when it is idling. But, if you set the idle screw so it idles nicely when the engine is hot, then when the engine is cold it idles at about 500 RPM or something and is barely running. So there is a huge discrepancy in a good idle screw setting between when the engine cold and and when the engine is hot. The CRF150 carb has a simple choke for cold starting (instead of an enricher circuit as in the stock carb). Usually a choked carb likes to have a high-idle setting for when the engine is cold, but the CRF150 carb doesn't have this. Is there any good solution to this?