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 Post subject: No compression
PostPosted: Thu Apr 29, 2021 9:03 pm 
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Probie

Joined: Thu Apr 29, 2021 8:52 pm
Posts: 1
I have been working on a roketa liquid cooled 250. It is gy6 or ch250. Had a bad piston so I decided to replace it with piston and rings, I also replaced the cylinder and head all new! Put it all back together and no compression. Checked my timing twice its right i believe. Even tried without the rockers on which are attached to the top cover. I'm lost! Any ideas?


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 Post subject: Re: No compression
PostPosted: Thu Apr 29, 2021 11:10 pm 
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Aftermarket Dealer

Joined: Thu Jun 03, 2010 2:49 am
Posts: 389
Location: Edmonton, Alberta
Did the same thing as you before.

Put everything together, make sure, as you said that the timing is right. Release both lever on the cover. It's a M6 bolt. I mean un tight both bolts. Right after that you can take a compression gauge and test it again, you should have compression.

If you do have compression, you need to start the engine to adjust the valves. You will hear the rocker click on the cam and valves, turn one lever at the time until you don't hear the click anymore.

This is what I did but by memory, somewhere on this forum someone also did it differently. Do some search.

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 Post subject: Re: No compression
PostPosted: Thu Apr 29, 2021 11:17 pm 
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Aftermarket Dealer

Joined: Thu Jun 03, 2010 2:49 am
Posts: 389
Location: Edmonton, Alberta
Check this link: https://www.buggynews.com/arg-hh250ss-cf250-no-start-t50704.html?hilit=250%20timing

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