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I have a bigdog alpha (aka hustler raptor). It had some work done on the smart choke. I feel that the engine is running at a lower rpm than it use too. I bought a digital tach you wrap around the spark plug wire. At wot with no load Rpm is 3150. What is the rpm range this engine should operate...

I have about 30 hrs on my Kohler. After cutting a yard I drop it to low speed to cool down on the trailer while I lock it down about 30 seconds or so. When I fire it back up at the next yard it gets stuck In choke mode. I can raise the throttle and it still says in choke mode. It also puffs out...

I love the mower. I do part time lawn service with it.

I have the Big Dog Alpha (aka Raptor). I think the blade tip speed is around 16k. What controls this speed? Is it the pulley connected to the blade engage unit. If so can you trade out the pulley for a Alpha Mp ( aka Raptor Sd) one and increase the speed.