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Old 20-06-2014, 09:48 AM   #1
Thundercat guy
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Country: Scotland
Location: Isle of Lewis
Occupation: Skipper
Boat make: Thundercat
Engines: Yamaha 70ces

Join Date: Apr 2014
Location: Isle of Lewis
Posts: 463


looking for some advice regarding the compression on my tohatsu 50.
It was at 140psi top, 135 middle, 140 bottom, then I took it apart to modify it.
I had 1mm removed off the head (which should raise it 30psi), but also opened up the exhaust port quite a bit.
Did a compression test yesterday and got 140, 135 and 140 again.

I'm going to do a squish test today.
My question is (if the squish test shows its OK) is it safe to remove more from the head to remove compression?
I know it's safe to run 180psi on a stock engine here with our fuel.


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Old 29-06-2014, 07:39 AM   #2
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Join Date: Oct 2011
Posts: 56
With opening up the exhaust you changed compression ratio again...
Everything you do has its effects on other things...
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