Hey all, Im pretty mechanically inclined but im getting stumped on this problem and I cant figure it out. I did a top end rebuild (piston rings, gaskets, o-rings, ball honed, etc)... now Im at a loss for compression. I checked my valves and rechecked my ring staggering but still getting extremely low compression. My manual calls for 150-215psi but im getting 80 max from all cylinders, any ideas??? Thanks in advance.
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Did you check if the bores were out of round when you redid the top end? Did you check your valve clearances when COLD? Did you make sure that the cams are timed and set correctly?America national sport is called baseballs. It very similar to our sport, shurik, where we take dogs, shoot them in a field, and then have a party.
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Did you take the time to at least check the bottom end (the crank & journal bearings)?
What caused you to rebuild the top end in the first place? Do you know what the pressures were before you started? Did you use over-sized rings when you did the rings, or did you get a set of the same size? Normally you need to go up a size to compensate for the extra material you removed in the bore during the rehone...
Cheers,
=-= The CyberPoet
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Originally posted by The CyberPoetDid you take the time to at least check the bottom end (the crank & journal bearings)?
Normally you need to go up a size to compensate for the extra material you removed in the bore during the rehone...
Cheers,
=-= The CyberPoet
Put on new head gasket and o-rings... only thing I can think of is my valves. Its just strange that I had good compression before this rebuild and I havent changed the valves at all.-If your not repairing your bike, your not riding it right.
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Originally posted by Sinok this is gonna sound dumb but have to even fired this engine up since the rebuild you do realize that rings have to seat in before you get max compression right. just a suggestion-If your not repairing your bike, your not riding it right.
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Originally posted by audionick12Originally posted by Sinok this is gonna sound dumb but have to even fired this engine up since the rebuild you do realize that rings have to seat in before you get max compression right. just a suggestion
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Adding oil will bump the compression but it will go back to crap as soon as it burns off.
Check your cam timing, as I said. If you have overlap, you will get poor compression because the exhaust cams will open too early.America national sport is called baseballs. It very similar to our sport, shurik, where we take dogs, shoot them in a field, and then have a party.
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Originally posted by FingersCheck your cam timing, as I said. If you have overlap, you will get poor compression because the exhaust cams will open too early.
Cheers,
=-= The CyberPoet
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