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what is the compression pressure in 02 yz125This is a discussion on what is the compression pressure in 02 yz125 within the 2-Stroke Motorcycles - Yamaha forum, part of the 2-Stroke Motorcycle Forums category; need to do a leak down test
anyone know whats the PSI ?... |
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#2
03-05-2004, 12:28 PM
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 Re: what is the compression pressure in 02 yz125 Generally 5 psi is needed. The piston needs to be at BDC to allow the transfer ports to link the cylinder bore and the crank case. The bleed down rate should not exceed 1psi per minute.  |
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#3
03-05-2004, 01:10 PM
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| Re: what is the compression pressure in 02 yz125 I just did a topend job on a 03 YZ125 last week. It started out at 115 lbs. before the topend and after break-in it went to 145 lbs. |
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#5
04-16-2004, 11:25 PM
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| Re: what is the compression pressure in 02 yz125 "It started out at 115 lbs. before the topend and after break-in it went to 145 lbs." Thats not much pressure for a new bike. My 84 yz250 had 150 lbs. when I first put the rings in, now its got 165 lbs. |
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#6
04-16-2004, 11:56 PM
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| Re: what is the compression pressure in 02 yz125 YZgreg: That's because yours is a 250! |
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#7
04-17-2004, 03:30 PM
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| Re: what is the compression pressure in 02 yz125 Iv'e seen 125's with 200+lbs, but I guess that 125 is stock. And my 250 is 20 years old! but I guess people that ride 125's are too light to kick over a high compression bike? |
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#8
04-17-2004, 05:29 PM
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| Re: what is the compression pressure in 02 yz125 I can kick over my friend's CRF450R easy. Hot or cold. |
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#10
04-17-2004, 06:29 PM
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| Re: what is the compression pressure in 02 yz125 When I rebuilt the topend on my CR250R...About 2 months after I did it I checked it and it cranked out 188 PSI. |
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