Stihl KM 131 Problems , Valve Adjustment, STIHL 4-MIX ENGINE 

Nice one mate, glad it helped 👍

Yes quality of things certainly going down hill fast. Cheers

Cheers, yeh i stay away from e10, not worth the risk in my eyes.

@@RJLgardens Something has gone wrong when your garden tools run on a better quality fuel than your car. They generally get E5, the car gets E10. I tend to use E5 with a fuel preserver from Mountfield, but there's always the time when you run out and have to use what you've got on hand.

Nice one, glad it helped 👍

Hi quick question, if the machine starts easily, is that a sign that valves don't need adjustment or would you still say they need to be adjusted as a matter of course? Friend said to me I need to adjust them every 25 hours of use. Thanks

​@@fatsoulcrew100 hours is the required adjustment schedule for valves. Whenever I've adjusted them, they've never been in spec. A KM131r lasted me 4-years of self-employed gardening use. The new one isn't like the last.. It's leaking on the air-filter already. Just adjust them and change the valve-cover and washer... They come in a kit with the feeler-gauge. Do the filters and plug as well.

@@ReggieChump ah thanks reggiechump, really appreciate the advice. 100 hrs much better than 25, was worried would have to do it all the time. have bought the feeler gauge will be doing it soon.

Amazes me that most pros dont look after their equipment considering its what earns them a living. Good luck sorting it out 👍

yeh same way

Looks like just an electrical wire connector, nothing special.

I've always done it on a cold engine 👍

Sounds like a carb issue, possible needle valve problems. 👍

@@RJLgardens Thank you. Will try to adjust the carb 👍

@@ReggieChump carb will likely need taking apart and cleaning, you prob have a bit of debris in there.

It could be a number of things, I would check air filter, fuel filter, sparkplug, fuel quality and then look at the carb itself and check its adjusted correctly, it may even need a carb clean. Always check the basics before doing the valves, but could be those as well. 🤷‍♂️

@@RJLgardens The valves seemed ok when I checked. The carb seems quite complex and messy, so I haven't opened that up. I swapped the chainsaw plug in and got the same result. Tried with air filter off. It might be the case that nothing is wrong, but it just sounds rough to me when over 50% throttle. I haven't tried it under load and maybe that matters for this engine (unlike a chainsaw for example) I couldn't find much on RU-vid to confirm how the engine should sound. This one briefly shows the sound I'm talking about when throttle gets close to wide open. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-vC81047EeRs.html And this one shows what I would consider a smoother running engine ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-IOotUxoTR5w.html It's a KM 130 R, but they all seem similar.

If you are on about the burbling when at full throttle, that could be just the revs hitting the limiter, my km131 does this and makes it sound rough but its nothing to worry about. You could open up (Counter clockwise) the H adjustment screw on the carb a little bit to possibly stop that.

@@RJLgardens It starts at about 50% throttle and gets a little worse from there.

@@kiwicam6419 Dunno mate, i would defo be checking the carb adjusting screws to start with

That sounds annoying. I've had no issues with mine its been spot on. 🤷‍♂️

Late to the party but what was the tank valve issue causing? I’ve a couple, one of which has become a pain in the arse, fires up fine initially, then if I switch off, floods so bad it’s dripping out the filter😂 I’m thinking it’s possibly the diaphragm, but also wondering what else it could be & tank vent was one I thought of… though I’m fairly clueless😂 Apologies for the essay & thanks👍🏻

Bad-Apple.... Friday finish from Stihl. Same here, 4 years of every day use (well serviced by myself) no problems. Sold it, still running, but worn out! New one won't stop getting the air-filter wet and cuts out.

@@ReggieChump I don’t use the motor much - unless it’s for particularly heavy work - soon after posting, I bought a kma131 with two 300s batteries and has become my go to kombi. I also bought the reciprocating cutter - no more strimming dramas with clients smashed double glazed patio doors for me!

Exact problem ive had, again 3 yrs old from new. Did you sort it?

No smoke in the exhaust at all. This operates totally different than a 2-stroke engine with half as many compression strokes and more complete fuel burn due to the valves vs transfer ports on a 2 stroke.