Compression reading

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Philly Eddie
Posts: 15
Joined: Wed Sep 13, 2017 4:32 am

Compression reading

Postby Philly Eddie » Sat May 23, 2020 6:36 pm

What is a healthy ballpark range of psi for cylinder compression on a stock 450 (spring head)? I cannot find this info in any manual. Thanks.

Jordan
Posts: 1380
Joined: Fri Dec 24, 2010 11:29 am

Re: Compression reading

Postby Jordan » Sat May 23, 2020 11:13 pm

This data is not usually stated for a single cylinder engine, because it isn't very useful I think.
With a multi cylinder engine, comparative readings between cylinders can be meaningful.

Duccout
Posts: 1285
Joined: Wed Feb 05, 2020 1:20 pm
Location: Essex UK

Re: Compression reading

Postby Duccout » Sun May 24, 2020 10:11 am

In the good old days, good compression was determined by being able to stand on the kickstarter for a few seconds.

Bevel bob
Posts: 1043
Joined: Thu Apr 15, 2010 8:01 am
Location: Bromley Kent UK.

Re: Compression reading

Postby Bevel bob » Sun May 24, 2020 3:57 pm

I know my compression is good.Attempt a bump start in first or 2nd and the back wheel locks up and you stop .

Ventodue
Posts: 952
Joined: Mon Mar 08, 2010 3:23 pm
Location: Montpellier, France

Re: Compression reading

Postby Ventodue » Mon May 25, 2020 11:03 am

Duccout wrote:In the good old days, good compression was determined by being able to stand on the kickstarter for a few seconds.

Doesn't seem to have much effect with my Vento, Colin. Just me left standing on one leg, 18" or so off the ground ... :D

Duccout
Posts: 1285
Joined: Wed Feb 05, 2020 1:20 pm
Location: Essex UK

Re: Compression reading

Postby Duccout » Mon May 25, 2020 11:11 am

Craig, that reminds me of my mate's Norton Commando, which would leave you suspended in air; a bike for Real Men!


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