Engine Idler Assembly for Gas Engine Air Compressors - Honda GX390, GX620, GX630 and Kohler K, Magnum, Command, CH440
Engine idler assemblies for engine-driven air compressors, supplied matched to the engine they bolt to. Pick your engine from the list and you get the idler built for it.
On an electric compressor the motor simply stops at cut-out pressure and starts again at cut-in. A gas engine cannot do that. Restarting a hot engine against a loaded pump every few minutes is how you destroy a recoil starter, a battery and eventually the engine. So an engine-driven compressor runs continuously and uses an idler system instead: at cut-out the idler drops the engine to idle and takes the load off the pump, and at cut-in it brings the engine back up to speed. The engine never stops, and the machine is ready for the next tool the moment the trigger is pulled.
Engines covered
- M5525: Honda GX390, 11 to 13 HP
- M5527: Honda GX620, 20 HP
- M5545: Honda GX630, 20 HP (current version)
- M5531: Kohler CH440ST, 14 HP (current version)
- M5521: Kohler Command, 11, 13 and 15 HP
- M5512: Kohler K Series and Magnum, 10 and 12 HP
- M5515: Kohler Magnum, 18 HP
Match the engine, not the compressor
The idler mounts to the engine, so what matters is the engine model and horsepower, not the brand on the compressor tank. Check the tag on the engine itself before you order. The two entries marked current version, the GX630 and the CH440ST, supersede the older GX620 and Kohler Command parts on machines built since those engines changed, so if your unit has been repowered at some point it is the engine in front of you that decides, not the build date of the compressor.
Related parts
The idler works alongside the throttle control, commonly called the bullwhip, which is the cable and cylinder that actually pulls the engine down to idle. Those are sized by engine horsepower and cable length and are ordered separately. We also stock the complete idler kit for the Kohler diesel, and its individual service parts: the idler spring, the air cylinder, the tie rod end and the nylon control tube.
Not sure which one
Engine idlers are easy to get wrong because several engines share a horsepower rating and the mounting is what differs. Send us the engine model number off the engine tag, and the make and model of the compressor if you have it, and the Warthog Air Compressor Store team will confirm the right idler before you buy.
Engine idler assemblies for gas engine driven air compressors, covering Honda GX390, GX620 and GX630 and Kohler K Series, Magnum, Command and CH440ST, matched by engine model and horsepower.
NOTE: Actual product may be different from pictured!
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