How to adjust valve clearance on Stihl4mix ?

[porky]

Following on from the thread about valves in Stihl 4 mix engines I looked in the manual for my KM90 and it says to take it to a Sthil dealer after the first 139hours for adjustment or checking. Is it possible to do it yourself?

[treediver]

I used these references when the valves on my 4mix went completely out of adjustment.

 

http://www.cdcstihl.net/techtips/tips_v1n2_sm07.pdf

http://golftechs.us/Reference/4.pdf

[gensetsteve]

No wonder these engines can give trouble that is a very small gap. I would imagine with an engine running slightly lean it would not take long for the valve to regress and close that gap up . Regular servicing I would say is defo on the cards for these little engines those two links are very good and show clearly how to carry it out.

[GardenKit]

Treediver has posted very good links, follow those and you will not have any trouble.

 

You will almost certainly find that the gap has widened, possibly to the point of preventing the decompressor from working.

 

Tip, a normal 0.1mm feeler guage is a little too wide at the tip. It is best cut down to about 3mm wide at the end so that it fits on top of the valve stem and between the pressings on either side of the rocker arm. It can easily be snipped with a good sharp pair of scissors.

[Bombadil]

I used these references when the valves on my 4mix went completely out of adjustment.

 

http://www.cdcstihl.net/techtips/tips_v1n2_sm07.pdf

http://golftechs.us/Reference/4.pdf

 

 

Thanks for the links TD

I've been having some bother with my 4-mix, so it may be time to get the spanners out.

[porky]

Thanks for that Treediver