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Joined: Feb 2007
Posts: 8
Novice
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Can anyone on the board tell me how to compression test a single cylinder mitsubishi generator engine with soft-start incorpoated i.e how do you disable soft start so that you get true compresion test rather than a false reading. I can't find any visble mechanism such as a decompressor externally. any ideas gratefully accepted
thanks, NZ635
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Joined: Dec 1999
Posts: 5,430 Likes: 36
Repair Junkie
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nz635, You will not see a decompresser as it is in the valve lifter system. 
Regards, ![[Linked Image]](https://www.outdoorking-forum.com.au/forum/images/members/mower-monsterw.jpg) Bruce Please do not PM me asking for support. Post on the forums as it helps all members not just the individual.
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Joined: Feb 2007
Posts: 8
Novice
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Thanks Bruce, so if you were doing a compression test how would you go about it in order to get a true reading?. Can you over ride the valve lifter, or is it a case that you can't actually perform a compression test
Thanks NZ635
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Joined: Dec 1999
Posts: 5,430 Likes: 36
Repair Junkie
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nz635, If you pull the engine over a few times you should get a reading unless the valve clearance is not correct or the head gasket is leaking. Is your reading over 70?
Regards, Bruce Please do not PM me asking for support. Post on the forums as it helps all members not just the individual.
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Joined: Feb 2007
Posts: 8
Novice
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Thanks for the info, i'll give it a try and get back to you if it isn't over 70- have a good day.
NZ635
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