VS 750 valve timing 1989 - Page 3
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Thread: VS 750 valve timing 1989

  1. #31
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    I really hate to say this but........

    The fact that nothing bangs into each other as you manually turn the engine does NOT prove that the valves are timed right.

    I hope that they are but unless you have stepped through at least one entire engine cycle and watched pistons, valves AND the igniton timing you don't know for sure.
    Don't believe everything that you think.

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  3. #32
    M-J Lifetime Achievement Award
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    So what you are saying is both cams are set to the rear timing mark?...(RRT in your last post...am assuming you meant RFT)
    Smoke me a kipper I'll be home in time for breakfast

  4. #33
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    Firstly yes both cams set on the RF/T mark,rear cam set to T mark (TDC) the dowl is in the righr place,on the uper right,
    and the line across the cam lines up with the head ,replace rocker cover ajust valves to 0.004 inch,do not move engine,
    then place front cam in, set as norma,l line on cam lines up with the head,replace rocker cover,
    TURN ENGINE anti clockwise till you get to FF/T mark,then set to T mark,
    ajust valves then to 0.004 inch ,
    this is what we did ! so now nothing jams ,
    we then rotated the engine using the 17mm bolt on the end of the crank about 5 complete engine FULL cycles,
    turns,then we went through the complete cycle, rear induction,inlet open,compestion fire,exhaust,
    did the same on the front cycle,checking vales as they open and close and also
    checking wher the RF/T marks were,and the same for the front cylinder FF/T marks were,
    all seem to be correct ?on the bench !!!!!!!!
    now just needs the bike rebuilt ,but this wont be now for a few weeks,other commitments
    but thats all i can say at the moment but if you look at the valves timing ajustment page
    in the manual,thats the same as we have done it,cams in the right place !
    FINGERS CROSSED but i no its right if you set the cams ANY DIFFERENT WAY it will jam !
    XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

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  6. #34
    M-J Lifetime Achievement Award
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    What firing interval is this engine?...do the pistons rise and fall together....360 degree interval or does one rise as the other is falling....180 degree interval...there is a 270 degree where one piston rises and at about two thirds of the way up the other starts to rise. Depending upon which interval the engine is may explain why the cams are set up as they are.
    Smoke me a kipper I'll be home in time for breakfast

  7. #35
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    Hi Steve,yes you have it( there is a 270 degree where one piston rises and at about two thirds of the way up the other starts to rise)
    i think thats just abou right ? they dont both rise together,
    im not that cleaver in this engine stuff but for WEEKS i myself and friends have tryed and tryed to sort this out by the book
    but had no luck UNTILL we looked at the valev timming photos and then looking at the way we had set it,it was different ?
    so by setting the cams by the photos,it works !!!! and fires at TDC on both cylinders wher it should, going by the RF/T
    for the rear and FF/T for the front ,
    as i said its going to be a while now before i get to put every thing back together,as im waiting for new gaskets,
    for the 2 chrome engine casese plus i have work comitments,all the summer time iv lost,so now every thing comes first and bike second,
    should be about 4 weeks time fingers crossed, plus my friend in now going to do a youtube video of it goinng back together
    including the cams being set,to resetting cam chains,and doing the tappet ajustment,then putting bike back together,
    HE will be doing it not me,LOL im holding the camera !!!!!!!!!!!! IM SHY LOL
    xxxxxxxx

  8. #36
    M-J Lifetime Achievement Award
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    Right at a 270 degree offset of the crankpins the valve timing will be very similar to each other...ergo why it has to be set the way it is. This is a Honda yeah?...they fiddled around with the timing on some their bikes to try and match other race machines speed out of corners at the track...(from the internet so it must be true!)
    Smoke me a kipper I'll be home in time for breakfast

  9. #37
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    Sreve ????? all this help you have given me and you think its a HONDA
    its a SUZUKI VS750 ,there is a clue in the heading
    you are half right its built in JAPAN !!!!!!!!!
    xxxxxxxxxxxxxxxx

  10. #38
    M-J Lifetime Achievement Award
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    Right I dont pay much attention...they told me this in school all those years ago!..
    Smoke me a kipper I'll be home in time for breakfast

  11. #39
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    UPDATE,we have the engine,loom and carbs in the frame,put a fully charged battery on it,
    hit the starter ? turns over fine,put plugs in,turns fine,plenty of spark,
    put a small Plastic tank on it with new fuel in it,just graverty fed not on the pump !
    it turned over twice then BANG and away she ran !!!!!!!!!!!!!!!
    SOUNDS FANTASTIC !!!! only ran for a few seconds,NO RAD,NO EXHAUST LOL
    so there you go ! all running no knocking just like a swiss watch !
    never sounded this good before Ha
    now just have to put the rest together,over the next week or two then ???
    back on the road again ,
    sad i missed all the great weather but ?????????????????????
    a good winter will do !
    just like to thank you all for your help !
    EXCEPT ! MRSUZUKITECH ? your so full of %%%%e !
    i bet even you EYES ARE BRONW ????????????
    grgmini likes this.

  12. #40
    M-J Lifetime Achievement Award
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    Excellent...worth the effort hey?
    Smoke me a kipper I'll be home in time for breakfast

  13. #41
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    UPDATE,Hi every one,just an update on the bike FANTASTIC !!!!!!!!!!!!!
    now covered over 1,000 miles,as sweet as candy,quiet as a mouse,and goes like the wind,
    these are FANTASTIC BIKES !and looks brill !
    had a slight problem with weeping lower hoes ? the odd drip ,but now new one fitted
    i love this bike so much,i get the chills before going out !
    so just a BIG THANKS for all your help
    MERRY CHRISTMAS AND HAPPY NEW YEAR !!!!!!! XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

  14. #42
    Newbie
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    Hello


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