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rotary valve timing

Discuss rotary valve timing in the SNOWMOBILE RELATED DISCUSSIONS AND RIDING AREA's forums; now i done it! took apart rotary valve without marking were it was now i dont know were to set ...


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    Member hogwild's Avatar
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    rotary valve timing

    now i done it! took apart rotary valve without marking were it was now i dont know were to set it. is thier any way to figure this out with out a trip to dealer ?.. had to tighten fitting under the rotary valve it was leaking thats why i took it apart..
    mud in the blood , rocks in the head, 2012 outlander1000 lotsa good chit



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    Re: rotary valve timing

    Quote Originally Posted by hogwild View Post
    now i done it! Took apart rotary valve without marking were it was now i dont know were to set it. Is thier any way to figure this out with out a trip to dealer ?.. Had to tighten fitting under the rotary valve it was leaking thats why i took it apart..
    i have a shop manual if you want..... You're the guy that knows gerald melloy..... He is now a member on this site too.... He is under the name of his car(can't remember the name...dam....gettin' old i guess). It's on one of my t-shirts......let me know if you want to borrow the manual..... This is a 670 i take it???
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    Re: rotary valve timing

    Assuming its a 670 the timing on valve works well at

    opening 145 degrees and closing 71 degrees with mag cyl at TDC and the measurments being made on the mag side intake port. Now you will need a degree wheel for this. However to be more specific what year and model is the machine? There are 2 pages of timing specs all the way from 1975 up to 1998 for every rotary valve engine ever made.
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    Re: rotary valve timing

    ya i know gerald, his car name is after shock.looks like my sled is going to dealer i dont have a degree wheel.thought there might be a simpler way. its not a 670 its a 785 union bay based on 670, wonder if timing should be different for this engine.
    mud in the blood , rocks in the head, 2012 outlander1000 lotsa good chit

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    Re: rotary valve timing

    Quote Originally Posted by hogwild View Post
    ya i know gerald, his car name is after shock.looks like my sled is going to dealer i dont have a degree wheel.thought there might be a simpler way. Its not a 670 its a 785 union bay based on 670, wonder if timing should be different for this engine.
    hi...... Yup, you should contact union bay, as they liked to have a specific timing......i think they recomended the 583 timing spec, but it would be best to find out their recomendations for sure..........

    Gerald's site name is "aftershock"......obviously after his car....
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    Re: rotary valve timing

    You will have to contact a company called Fastrax Motorsports as they have purchased union bay and all the rights and specs to there products (253)848-0908. Has there been any modification made to the intake runners of the engine?? I might have a spare degree wheel i can send you.
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    Re: rotary valve timing

    ya the intake runners have been worked. i am trying to find out who biult motor . waiting for guy i got sled from to get back to me
    mud in the blood , rocks in the head, 2012 outlander1000 lotsa good chit

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    Re: rotary valve timing

    Quote Originally Posted by hogwild View Post
    ya the intake runners have been worked. i am trying to find out who biult motor . waiting for guy i got sled from to get back to me

    If it is without a doubt a union bay engine call Fastrax, they should have all the specs for that engine
    MAD MOTORSPORTS CUSTOM SNOWMOBILES. Visit us at http://www.madmotorsports.ca or find us on facebook



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