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  1. #1
    Melbourne (AUS) gtile04's Avatar
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    Pulling cylinder heads out on gp1300r

    guys i need help d/c my powervalves so i can take my cylinders out for a top end rebuild, any help would be appreciated


  2. #2
    African-American
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    get the service manual.

    , password is 3 chracters, hint: gp_

    http://rapidshare.com/files/270999606/GP1300R.zip (~11mb)

    http://rapidshare.com/files/270998098/GP1300R_Sup.zip (~2mb)

  3. #3
    Melbourne (AUS) gtile04's Avatar
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    so i just did another comp test all 3 cylinder came to about 92-psi i put some oil down each cylinder and did another comp test they all came back at 145 psi give or take 2 psi. What is going on with my compression and how did i fix that problem thanks

  4. #4
    Work Harder, Millions on Wellfare Depend On Us! ultramaxracing05's Avatar
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    doing a comp test with fluid in the cylinders does not fix your problems, all its doing is helping make a better seal, but this is not an accurate test.

    tests are to be made with the throttle wide open and the rest of the plug out.



    on seadoos, you can heat up the cylinders in the oven, and they come off, just make sure the wife is not home, this method might be applied to the yamahas.

  5. #5
    Melbourne (AUS) gtile04's Avatar
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    thanks mate i think my rings are just trashed

  6. #6
    Work Harder, Millions on Wellfare Depend On Us! ultramaxracing05's Avatar
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    get your engine out and take it to any machine shop to get it mic (measured)
    and they will pretty much tell you what size pistons you need,

    unless your sleeves are at full bore, than you might need to extract them, my shops usually charge me $100 to extract and install the new sleeve, and they will even deck it for free, bores are usually $ 40 per hole.

  7. #7
    Happily Self-Employed WFO's Avatar
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    Yamahas are a little different...

    first you check compression with all plugs installed except for the cyl you are checking, and make sure the power valves are closed, and the throttle is open

    also Yamaha GPRs have nikasil embedded into the aluminum of the cylinder, so there is no cast sleeve

    if the cylinder bore is severly worn or scored, you will have to get another cylinder or have yours re-plated

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