2 Stroke Compression

Dillingsuk · Two Stroke Sniffer Joined: 14 Jan 2006 Karma :

Got the motor back together today ready for fitting into the frame, when kicking the engine over there isn't much compression. Is this normal for "dry" barrel thats just been put back together? Im hopeing this will improve when the engine is drawing in its air/fuel mixture?

hazza · World Chat Champion Joined: 28 Sep 2005 Karma :

you do have the spark plug in right?
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3 Honda NC50's(Sold)-->'72 Puch Maxi S (Sold, want it back!)--> '90 Yamaha RXS 100 (Stolen)--> '87 Honda Cub 90(Sold) --> '95 Kawasaki Eliminator (Sold) --> '98 Bandit 600 (Sold) -->'07 SV650S (Current)

Dillingsuk · Two Stroke Sniffer Joined: 14 Jan 2006 Karma :

Havent got the plug in yet, just had my finger over the hole! But can hear the air passing the rings, but the barrel is "dry" (no oil) hopeing this will improce when "wet"?

hazza · World Chat Champion Joined: 28 Sep 2005 Karma :

lol how do you expect compression with a big hole in the top of the head Laughing

it should be fine mate whack the plug in if your not sure, the air you hear is the air escaping past your finger because its not a proper seal, try it and im pretty sure you will feel the different, if not the base gasket probably isnt seated right
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3 Honda NC50's(Sold)-->'72 Puch Maxi S (Sold, want it back!)--> '90 Yamaha RXS 100 (Stolen)--> '87 Honda Cub 90(Sold) --> '95 Kawasaki Eliminator (Sold) --> '98 Bandit 600 (Sold) -->'07 SV650S (Current)

0ddball · World Chat Champion Joined: 15 Jul 2005 Karma :

The small ones don't have much compression anyway, you can start most 2 strokes by hand. Once you get some oil in the barrel and the rings bed in it will improve slightly.

You haven't done something silly like fitting a standard size piston in an oversize bore have you?

john2 · Brolly Dolly Joined: 25 Mar 2006 Karma :

Get some oil in it, then see the difference.

Dillingsuk · Two Stroke Sniffer Joined: 14 Jan 2006 Karma :

Standard barrel, standard rings, its prob me just over-reacting theres only one way to find out! If it starts ill be happy if not well......................... Crying or Very sad

john2 · Brolly Dolly Joined: 25 Mar 2006 Karma :

If you dont mind wasting time in having to take it out again, then i would just fit it all up and then fire it up.

J.K.R · World Chat Champion Joined: 06 Feb 2005 Karma :

Get a compression tester on it!
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