Low compression problemo: Yamaha Timberwolf
#1
02-15-2018, 04:14 PM
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Low compression problemo: Yamaha Timberwolf
I’ve been trying to get my four wheeler started and believe it’s a problem with compression (75 psi). I was going to try to adjust the valves but when taking off the cover to make it top dead center I noticed the screws were very loose and it looks oily on one of the sides of the cover. I’ll add pictures. Would this have caused the compression problems or is it just loose screws?
#3
02-16-2018, 08:07 PM
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Thanks for the response, I figured out a couple of more things that have stumped me.
The valves didn’t need adjusting. I found more oily areas around the engine (I’ll put some pictures in). Is this most likely the problem it doesn’t start? Is it a gasket? Also should a four wheeler be able to start with 75 psi compression?
Much appreciated, thanks
#4
02-17-2018, 03:45 AM
#5
02-19-2018, 06:36 AM
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#6
02-19-2018, 09:11 AM
Low compression on a 4 stroke would be rings if the valves are adjusted properly Or else your valves are not seating properly you having 75 for compression is very low need about 90 for it to run or start. You could try pull starting it and it might start but not with the starter. Time to pull the head and top end off it sounds
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02-19-2018, 08:48 PM
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#8
02-20-2018, 04:13 AM
Depends on how competent a mechanic you are. Like you wrote in your first post, first thing to check is valve clearances. If they are too tight the compression will be low. if they are OK, it looks like the cylinder head will have to come off. A manual, such as Haynes or Clymer is essential for the novice, when doing engine work.
#9
02-20-2018, 06:33 AM
If your asking that question you will need to take your head to a shop. Also you will need to take your jug in too so you can get it honed or bored if its not in the tolerances for that piston. order a top end kit for it and make sure there are valve seals in the kit because you will want to replace them at that time too since your grinding valves and they will be out. adjust your valves first and go from there
#10
02-20-2018, 08:58 AM
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