Question about Stihl Ts 410 420 Cut Off Saw Decompression Grommet

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

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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.

Posted on Jul 18, 2011


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Sorry on way 1st question went engine has new gas-fuel filter,line carb taken apart cleaned-starter taken apart wheel is engaging sanded and cleaned flywheel-magneto for sparkplug cleaned and working

Either the valves are out adjustment or the decompressor has failed.

Most OHV valves valve clearance open over time causing the decompression system to become in effective; however, the decopressor fails and even properly adjusted valves will still will not decompress the cylinder for starting.

I just repair a B&S 310000 series that had so much compression that the engine would even complete a cycle. After checking the valve adjustment I found that the decompressor on the cam had failed.

May 12, 2015 | Electrical Supplies

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No compression, decompression jammed

Valves could be sticking closed or open causing (good or bad compression) that or de-com-lever if faulty somehow.. And you need to do a compression test

Oct 04, 2014 | 2004 Yamaha WR 450 F

1 Answer


If the saw is fitted with a decompression switch you need to decompress the cylinder after every pull to make it easier to start. If it doesn't have a decompression switch you need to put the saw on the ground and put your right foot firmly into the handle opening, place your left hand on the top hand bar, grip the pull handle and pull out slowly until you feel a solid wall or compression and then pull straight up fast and hard for about 8 - 10". Make sure the brake is on when starting. I have an older Husky saw and this is how I start it. It has a short pull cycle so don't try to give it a long pull like a weed whipper!

Feb 12, 2014 | Husqvarna Garden

2 Answers

Hard hitting on compression stroke when starting

Most Briggs deco vaves are internal and pretty reliable, the valve clearances are very important, if the exhaust valve clerance is too wide the valve lifter will not work, if there is no adjustment yoy would have to fit a new service valve and re do the clerance by removing material from the valve stem

Jan 02, 2014 | Briggs AND Stratton Intek Briggs &...

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

2 Answers

Where is compression release for polaris sportsman 4x4 atv

Polaris uses an automatic decompression that sits in the exhaust cam. There is not an external lever as there is on older Kawasaki's and dirtbikes. What seems to be the issue as to why you're looking for a compression release?

Sep 21, 2011 | Polaris ATV

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

1 Answer

Decompression problems --cam shaft looks in good condition but it is not decompressing when turning over,the valves have been set at tdc @ .15 mm ,the cam is stock pn # 58436010044 the cam is sold as an...

the valve clearance is incorrect at .15mm ( .005") it should be at .010"inlet and .012" exhaust and is set on tdc but on compression stroke tdc
decompression cams have a special grind that holds the valve open for starting revolutions and as the engine rpm picks up the cam follower doesn't follow the profile any more and closes the valve
engines that utilize such a cam are motors that have a rating exceeding 3 hp on a rope pull otherwise , the piston cannot be pulled over compression past enough to get it started
5 hp lawn mowers , 10-20hp rope pull generators etc have this cam

Dec 09, 2017 | 2003 KTM 625 SXC

2 Answers

2005 Honda crf450x cold starting

doulbe check the grounds, & you might need to add and extra ground wire to the bike, closer to the starter. This should help. There is a valve that release the compression when you kick it off.You might see if you can pull this release the compression valve while pushing the start button????

Feb 07, 2009 | 2005 Honda CRF 450 X

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