VS 750 valve timing 1989
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Thread: VS 750 valve timing 1989

  1. #1
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    Question VS 750 valve timing 1989

    Hi every one well my problem is my X husband started to rebuild my VS750 in april,
    then we split up in june hurrrrrrrrrray,the engine is on the bench with the cams in and the chains on
    but when i put the covers on and ajust the tappets its jaming ? checked the marks on the stator
    RF/T set on the T pionter for the rear,great valves flat on TDC, line on cam leval with head ,set tappets engine turns fine!
    turn engine clockwise to FF/T mark line up marks fine, as long as the tappets are like 10m gap its fine but
    when i ajust the front tappets to .004/005 then turn it,it jams ? this is my baby and was running great,
    now have looked on here and some one else had this problem along time ago ! 2012 i think ?
    he asked Dr Bob but i cannot find any reply ?
    Has my X done some thing to my engine just for spite ??????
    yes im a girl but love getting down an dirty with the guys

    PLEASE PLEASE PLEASE HELP

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  3. #2
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    I kind of doubt that anybody can help with that by remote control.
    It's a "hands on" kind of thing to actually SEE what is happening.

    It almost sounds like you now have the wrong valves or pistons.

    Alas Dr. Bob isn't with us anymore.

    Good luck.
    Don't believe everything that you think.

  4. #3
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    Thank you for your reply,but all that was changed was the cam chains!
    nothing else, the heads stayed on, the same cams that came out went back in ?
    F to the front and R to the rear as stated in the manual,in the right configeration ! but jamming on the front when ajusted ?
    after ringing him today and asking him what was done ?
    sadly hes not able to fix it for 18 months if you know what i mean !!!!!!! LOL

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  6. #4
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    Well then I would say that it is pretty obvious that the valve timing is WAY off but I'm not experienced with setting the cams.
    Good luck.
    Don't believe everything that you think.

  7. #5
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    EEEEEEEEEEEERRRRRRRRRRRRRR yeh ! thats what i said !
    the vavles are jaming when ajusted ?
    on the front exhaust,the rest are OK ?
    thats why ii camme here ,thought you guys might be aable to help ?
    im just a girl that is just tryinng her best to geet the f============ing thing going again !!!!!

  8. #6
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    Nobody here is clairvoyant so we can't SEE what you actually have there......and
    I don't think we have any mechanics here any more with enough experience to give you any specific educated guesses.

    Sorry. Maybe I'm wrong and someone will offer some advice.
    Don't believe everything that you think.

  9. #7
    M-J Lifetime Achievement Award
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    Can you elaborate on what is actually happening.... if the rising piston is hitting a valve/s left open due to the timing issue you need to get to a basic timing setting.

    To do this you need to determine when TDC on the firing stroke of the offending cylinder is then turn the asociated cam, (free of the chain), so no valves are open at all. Once this is done you should see some marks on the stator nearly lining up to another mark....either on the case or just ajacent of the stator or some dots on the cam gear that line up with some on the head.

    You may find the cam gear is 180 degree's off from the cam shaft if it has been removed....usually three bolts hold them on if they are this type of setup.

    At this stage you fine tune the timing.

    Good luck
    Last edited by Aussie Steve; 08-19-2018 at 09:35 PM.
    Smoke me a kipper I'll be home in time for breakfast

  10. #8
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    Thank you all for your help,iv got a friend coming round today to have a look !
    he has a good idea of cars so hope he can fix it ?
    if not the girls and i will smash it to bits in a KILL THE VS750 ENGINE party,
    insted of bring a bottle you bring a hammer LOL
    XXXXXXXXXXX

  11. #9
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    Hi could tell u what is wrong but to many doctors & to many guesses, get the factory shop manual & go step by step, than it will be good. NO guess work

  12. #10
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    Quote Originally Posted by mrsuzukitech View Post
    Hi could tell u what is wrong
    The shop manual advice is the best so far......but THIS comment is just an insult.

    If you KNOW (or think you know) what is going on, I suggest that you offer it up.......or don't mention it at all.
    Don't believe everything that you think.

  13. #11
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    Hi guys well still a NO GO on this engine ,
    my friend is stuck at work,covering for a none show after holidays,
    so its just sitting on the bench covered in a tee shirt !!!!!
    as for your comment Mr suzukitech,
    i have a manual and iv read it that mant times my eyes are sore ! i have gone through it over and over
    iv had 2 of my girlfriends read it to me,they have also confirmed what im doing is right but still jams?
    to be honest i think this is a JINKS on it ????
    i love this bike so much you would not belive it,but now im considering selling it on Ebay as a project
    it will break my heart but i would sooner get rid of it to someone who can fix it and enjoy the last weeks
    of summer,than just leave it here doing nothing!
    ill keep you all imformed of any progress i might have,
    Thank you for all yout help !
    XXXXXXXXXXXX Chistine

  14. #12
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    Just a girl? No such thing. Can you post some pics of the timing marks at the crank and cams? I have a 2000 VS800 and a shop manual, also I’m a veteran automotive tech. I’m sure we can figure out where the problem is. The advice to start over with the timing is a good one.
    —-Dan—-

  15. #13
    M-J Lifetime Achievement Award
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    You need to elaborate on how it jams...if it is the piston hitting the valve or some other way. I mentioned the cam shaft sprocket may have been removed....some do have a bolted on sprocket... and it may have been fitted 180 degrees out.
    Smoke me a kipper I'll be home in time for breakfast

  16. #14
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    Hi guys SORRY for delay replying been away !
    right took a few photos so here goes ?
    so not allowing me to add photos ?
    but this is wot im doing,both cams out,turn engine to RF/T pionter rear cam with the R ON IT
    fitted,line up with head,check picture in manual the dowl is in the same place !
    turn engine 360 clockwise to the FF/T aline with pointer put front cam in set with line leval with head,
    check manual dowl in right place,put cam covers on turn engine anti clockwise to RF/T set tappets to 0.04 thu
    turn engine 360 anti clockwise till front at TDC (probe in cylinder) at tha point bot front loes set both inlet/exhaust
    at same time 0.04,turn engine anti 360 fine then try to turn again 1/2 way round pisto coming up JAM ?
    if i undo tappets on exhaust the engine turns over ?
    i have eight photos i can send to a Email address if this helps ?

  17. #15
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    Just for clarity, you say you adjust the lash to .04 Is that mm or inches? The spec is
    .004” or .08-.13mm. We should be on the same page with critical measurements.


 
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