426 Compression


6 replies to this topic
  • smdonald

Posted August 30, 2007 - 04:41 PM

#1

Hey guys. I already looked for this topic. No Luck. Does anyone know what the compression should be on an 01 426? It has a Wiseco 12.5 to 1 pistion.

I just tested it and it has around 118 PSI.

  • smdonald

Posted August 30, 2007 - 04:42 PM

#2

Im assuming this is really low....

  • Solo

Posted August 30, 2007 - 05:22 PM

#3

Best way to get a status of the motor is to do a leak down test. A compression test is quite subjective to things like auto-decomp or manual, engine cranking speed and number of revolutions.

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  • smdonald

Posted August 30, 2007 - 06:43 PM

#4

what do i need to do a leak down test. i have a compressor and numerous other tools. do I need a leak down test gauge?

  • grayracer513

Posted August 30, 2007 - 07:30 PM

#5

Yes, you do.

  • Solo

Posted August 31, 2007 - 10:52 AM

#6

I have a Snap-On unit but here's a link that might help-
http://www.xs11.com/...isc/misc3.shtml

And HarborFreight has them-
http://www.harborfre...temnumber=94190

  • yamaha racing 230

Posted September 01, 2007 - 02:58 PM

#7

118 wow that realy low





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