Compression numbers

Discussion in 'Performance Mods' started by mountain80, Apr 26, 2009.

  1. mountain80

    mountain80 Member

    So I thought I would check around on what everyone is getting for compression numbers on their modded HT. I was getting 95psi stock at 4000 feet altitude and with the work i've done it is at 160psi. Its been like that for over 3000 kms now and no problems. I did port and polish and match as well as taper bore the carb and took 0.050 off the head. I also changed out the needle bearing to one out of a stihl chainsaw for better reliability. Any ideas how far we can go before she pops the rod????(Yah I know just before she pops the rod lol)

  2. Junster

    Junster Member

    Lol Murphy stay away..
  3. Mountainman

    Mountainman Active Member

    hey mountain -- you are up to 160psi -- that's pretty high there !!!

    and she's holding up well

    always a good thing MB
  4. mountain80

    mountain80 Member

    Yah shes up there, did change all the bearings and am careful not to over rev it, maybe that helps.....