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How to test decompression valve stihl chainsaw


Sounds like a valve that releases some or all of the compression during starting, to make ripping the cord easier. When the engine fires it is supposed to close automatically & allow the engine to start. They can become faulty mechanically (broken spring) or they can become clogged with combustion junk, esp if run the oil too rich. This will make starting difficult or impossible. Best fix is to replace with new or re-manufactured if you can get.

Apr 01, 2014 | Garden

1 Answer

Is there a decompression valve on a 2005 660 Yamaha Grizzly?


Most likely not and if there was it would be built into the valves/cam or you wold have a lever you would need to operated the decompression valve just to start it normally with the starter...

Dec 29, 2013 | Grizzly Big Bear Atv Maintenance Free...

1 Answer

268 stuck decompression valve


You can remove the decompression valve,it just screws into the cylinder. You can either replace if its broken or you can blank them off.

Aug 07, 2013 | Husqvarna Garden

1 Answer

Wont kick over


Does the decompression valve operate when the lever is moved? As the engine turns over easily with the plug out, but not with it in, I would have to suspect the decomp valve,

May 17, 2013 | Yamaha YZ 450 F Motorcycles

1 Answer

I just bought a 2001 yamaha YZ426F and it doesnt have a decompression lever.


Some 426's have a decompression lever and some don't if there is been a cam job done.

Apr 17, 2013 | 2001 Yamaha YZ 426 F

1 Answer

Husqvarna 345 decompression valve


The345 should have a blue push in deco valve on the r/h side of the cylinder, if not there may be a 13mm blanking screw there, this can be removed and a deco valve fitted.

Dec 24, 2012 | Husqvarna "Chain Saw - 16" Bar, 3 Hp

1 Answer

Put new decompression valve in , when pulling the pullcord there's no compression ,it justs jams


Check to make sure the old valve didn't have part of it fall down on top of the piston. I just had that exact thing happen to a TS400 in my shop for service.

Jul 12, 2011 | Stihl Ts 410 420 Cut Off Saw...

2 Answers

I have an xr250r 1996 but wen i kick start it thers no compression but can run start it sweet and theres heaps of compression how can i fix this problem


First , check your compression with a compression tester. It should be at least 100 pounds pressure just to run. Preferably 120,130,140,etc.. Some motorcycles have a decompression cable that works off the kick lever, others have a decompression lever you hand operate. I believe yours is hand operated . I think the actual lever in the valve cover on top of the motor is sticking or the decompression cable itself is hanging up and not allowing the exhaust valve to close properly.

Oct 01, 2010 | 1999 Honda XR 250 R

3 Answers

Getting my 2001 yz 426 started


hold the decompression lever in and kick it slow then let go of the decompression lever and give it a good kick without using the decompression lever.

Nov 29, 2008 | 2001 Yamaha YZ 426 F

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