century compression.

RAY SWANN · Post by **RAY SWANN** » Wed Jan 13, 2010 2:52 am

Hello all.
What is the normal compression reading for a Seagull century that has done a fair amount of work.
Mine is 65-70psi and I think this may be a bit low for a 100cc engine.
Any one any ideas ?
Thanks.
Regards all.
Ray.
p.s. The transom to motor bar (pivot bar) on my engine is brass.is this correct?

ROLL ON SPRING.

Hugz · Post by **Hugz** » Wed Jan 13, 2010 3:01 am

http://www.saving-old-seagulls.co.uk/fo ... f=5&t=1678

Sorry not in a chatty mood.......... so bluudy hot! Something has gone terribly wrong with the weather

billyboy · Post by **billyboy** » Wed Jan 13, 2010 3:03 pm

you should be happy. a new 102 motor was supposed to have about 60 psi but would still start on half that.so 65-70 is great!

RAY SWANN · Post by **RAY SWANN** » Wed Jan 13, 2010 3:16 pm

Thank you billyboy.
Thats good news.
Just thought the compression would be higher than on my 40s.Thanks for the information.
Regards
ray

billyboy · Post by **billyboy** » Wed Jan 13, 2010 3:22 pm

the 64's were supposed to be about 135 psi new.they would also start with about half that at a pinch.

rosbullterier · Post by **rosbullterier** » Sun Jan 24, 2010 2:56 am

Yes the pivot bar is brass.

Check your compression tester. 50psi is very good.
The 40 compression should be greater. See:

http://www.britishseagullparts.com/engi ... ession.htm

rosbullterier · Post by **rosbullterier** » Sun Jan 24, 2010 2:59 am

Further to that.
What is the engine number? I'm very interested in whether that cylinder head makes a difference.

Saving Old Seagulls

century compression.

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