Date: 19-10-25  Time: 20:10 pm
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Author Topic: cylinder 3 much lower compression  (Read 734 times)

mechanical music

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cylinder 3 much lower compression
« on: 23 June 2023, 07:56:53 pm »
why does the 3rd cylinder show low compression (70 psi) and the others are good (200-210 psi) on 2 different mk1 600 fzs engines all are cold readings as engines are not in bikes
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BBROWN1664

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Re: cylinder 3 much lower compression
« Reply #1 on: 24 June 2023, 09:23:29 am »
put a bit of oil in the cylinder to see if its a sticky/knackered ring.
Could be dirt/crap stopping one of the valves sealing properly too.
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Gnasher

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Re: cylinder 3 much lower compression
« Reply #2 on: 24 June 2023, 03:58:50 pm »
It could also be you've got a valve/s not fully seating. 
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basher

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Re: cylinder 3 much lower compression
« Reply #3 on: 02 July 2023, 09:40:48 pm »
for me its cylinder 4 is really low, I suspect rings are worn but I wont bother replacing the pistons until winter
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