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compression test

Discussion in '1st & 2nd Generation 1983-1989' started by jafo, Apr 8, 2010.

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  1. jafo

    jafo New Member

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    Yup Wiesco doesn't make but there sister company will for $850 they are J E pistons in LA I believe.
    I did get reply from the guy who has a 750 motor he is willing to let me do a compression test before i decide
    to purchase the motor keeping my fingers crossed that the motor is good with high compression will let you know
    will have more questions if i purchase it.
    Thank you every body for your help.
     
    jafo, Apr 23, 2010


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    #41
  2. GreyVF750F

    GreyVF750F Member

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    Your better off getting the other engine if it's good. Then your old engine/trans can be saved for parts like transmission pieces if you ever need them in the future. The parts that go bad are not made or stocked anymore.
     
    GreyVF750F, Apr 24, 2010


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    #42
  3. tinkerinWstuff

    tinkerinWstuff Administrator Staff Member

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    To answer your question; If you set the cam timing correct for hole #1, then I can't think of any scenario where it wouldn't likewise be correct for the cylinder next to it running on the same cam.

    You can however easily F' up the cam timing on cylinders 2/4 in relation to 1/3. When you compeletely remove both the front and rear heads, then it's a detailed process to ensure that you get the cam timing on 2/4 matched up correctly with respect to 1/3. I believe the process involves setting the crank to TDC, installing the cams in 1/3, then turning the motor over 360 degrees and installing the cams in the other head. So - I don't see how cam timing would contribute to a problem with compression in the left hole.
     
    tinkerinWstuff, Apr 24, 2010


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    #43
  4. jafo

    jafo New Member

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    motor i checked today was a bust did compression test in all 4 cylinders and all were below 100 psi
    did not have an air compressor to do leak down to find nature of problem so i decided not to purchase the motor
    as far as the cam timing I put cylinders 2&4 together 1st then 1&3 I had put front cylinders together 1st then honed rear two
    and with out taken cases apart for easier access to connecting rods I had to turn crank around in different locations to get to connecting rod
    bearings and if it was wrong wouldn't a valve be hitting a piston.:smile:
     

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    jafo, Apr 24, 2010


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    #44
  5. jafo

    jafo New Member

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    just thinking I have a 1983 vf750c magna motor it is shaft drive still has the crank and connecting rods
    Q: can i use those cases on my vf700f
    can it be switched over to chain ?
     
    jafo, Apr 27, 2010


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    #45
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