Compression ratio?

[rocks rev]

Whats the comp. ratio on an 03 900?

 

[1Mike900]

Can vary with altitude, roughly 135 - 155 and as long as w/i 5 to 10% max. of ea. other is the main concern. Would like to see within 2% of ea. other if possible. Mike

 

[rocks rev]

Can vary with altitude, roughly 135 - 155 and as long as w/i 5 to 10% max. of ea. other is the main concern. Would like to see within 2% of ea. other if possible. Mike

The ratio such as 13.1 14.4 is what i'm looking for?

 

[Sledbrain2]

Well I do not know if this will answer your question, my 800 mc with a 13.1 head registered 135 to 145 lbs. Problem with a two stroke is that you have to hold open the throttle and pull five times. Some say that you pull till it does not build anymore and also depends on how hard a guy can pull. I guess an engine builder could maybe clarify how to check a two stroke compression. Oh ya I am at 1200 ft.

 

[Double A]

Stock should be 12.5:1

 

[rocks rev]

Stock should be 12.5:1

Thanks, that's what I was looking for.