Maybe I checked mine and it was ok

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and I thought you were running a relativley mild setup.

I had the same prob a while back with the Hitachi carb, it seems sthat if the primary jet is blocked the motor will only work at high revs. One thing that blocks the primary jet is the octagonal shaped "anti diesel" solonoid that pokes out on the engines right (from the drivers point ov view). What this thing does is restrict fuel at shutdown. Say it woz broken then it would close the the primary all the time, causing it to only run at high revs. The way to test it is to see if it makes a "click" noise when the ignition is turned on. If the solonoide does'nt go "click" with ignition, there's your prob. I got one from a wrecker for $20 and it fixed everything.