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Illustrated Parts List for Stihl 4-Mix


LawnSite Bronze Member
Clovis CA
This is a long shot, but do any of you guys have the IPL
for the Stihl 4-Mix engine? Stihl is the only company that
doesn't provide IPLs for download at their website. I'm
curious as heck what the engine looks like on the inside.

Richard Martin

LawnSite Fanatic
Greenville, NC
Here some pics of a BR600 engine my dealer gave to me to tear apart.

This pic shows the valve guide that has dropped. That was the issue with the early BR series of 4 Mixes. If you look to the bottom right of the pic you can see a valve sticking out of the top of the piston. That's what happened if the valve guide dropped too far.



LawnSite Member
on my km90 last fall while in the middle of hedges i lost a valve spring washer droping a valve into the cylinder stopping it dead and doing no damage what so ever.
a cheap fix a new km110(needed to finish the job from hell and besides the shop needed a new trimmer dear) it was like 20$ in parts and like 40$ it tools/6 pack all is well.
the problem was from carbon build from regular stihl oil i now use stilh synthetic .
it happened about 5-6 tanks in from switching to synthetic (good stuff) it actualy started to break the cabon off and got a peice stuck between the valve and seat not closing all the way smaking the rocker into the valve with force breaking the washer.
shop manuals are online you just have to look a bit.