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  1. #1
    Moderator OsideBill's Avatar
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    Piston question 65U

    I just pulled my stock head off to put my R&D head back on. I am curious about the piston carbon build up seems more like sticky caramel like feel and if I should address this prior to installing my head I have to complete this tomorrow so any help is appreciated I have enclosed pictures and here is a brief history.

    I have run about two tanks of gas through a fresh cylinder bore with new wiseco pistons first break in tank was mixed 20:1 with yamalube the second was 32:1 yamalube. my break in was to start and run it for twenty minutes never going over half throttle and constantly varying the speed then let it cool completely do the same process again let it cool completely then run it normal no wide open throttle runs then next tank of gas ran it pretty much normal. also I did run it a little more rich about 1/4 turn on all adjusters.

    also compression checked 130 Mag, 130 Center, 125 PTO



    Thanks Bill
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  2. #2
    Flying Scotsman's Avatar
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    You have a lot off pistonwash.
    Mag piston looks a lot different to the other two.
    Are you running dual cooling it could be temp related.

  3. #3
    Moderator OsideBill's Avatar
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    no single stock cooling other than a jetworks valve into the stinger. also I modded the exhaust gasket per groupK's instruction opened a few extra holes in the center and pto water jacket area to more closely match the 1100. I think maybe the mag was a little more rich than the others. should i clean this prior to re-assembly?

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