kohler backfiring

[Breezeblock]

looking for some pointers about a kohler magnum 16 on a stump grinder.its backfiring really bad i think the valves are needing reground but it isnt an engine i am familiar with is there any service and parts manuals available for this there is also a bit of wear on the throttle spindle i read somewhere that the governors were poor on these engines .cheers to any advice

[Johny Walker]

check the head gasket, they tend to blow around the muffler

[Breezeblock]

is there a dealer for parts in scotland

[skyhuck]

If its on a chipper, they tend to do that, my Chippit 25 did it from new when you knocked the rev's down, apparently its the flywheel pushing the engine round.

[Bundle 2]

Tried running a lower octane fuel in it?

[Riggerbear]

I had a chippit 25 and a greenmech grinder with Kohler engines on them and they both backfired when you shut the revs down from new.

[Gareth Dalzell]

looking for some pointers about a kohler magnum 16 on a stump grinder.its backfiring really bad i think the valves are needing reground but it isnt an engine i am familiar with is there any service and parts manuals available for this there is also a bit of wear on the throttle spindle i read somewhere that the governors were poor on these engines .cheers to any advice

 

We had the same engine put onto one of our old Howard Gems - brand new Kohler Magnum and it back fires everytime you drop the throttle back quickly. I wasn't that concerned, just need to go easy when we throttle off

[armchairarborist]

they do backfire a bit, i hear kevs backfiring chipper everytime he's on my patch!

[Breezeblock]

i stripped it down to have a look see and when i lifted the head i turned it over and the exhaust valve lifts twice per two strokes once a fraction when the inlet valve is open and then it opens fully on the next stroke i think this is why it backfires so i dug into it further and there is part of the governor hitting of the bottom of the exhaust lifter does any body have any info on these engines

[Maico490]

Straight off I'm no expert on these but valve lifting twice may be an auto decompression device.