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So it begins.....

Discussion in 'The Garage' started by sweatybetty89, Aug 13, 2021.

  1. grizld1

    grizld1 Grumpy old man Top Contributor

    Yep. Leaving the old guide and cam chain in place is false economy. Use the guide from Hoos Racing, it's made right. MMM at 650 Central picked up some Tsubaki "peanut plate" cam chains cheap awhile ago and passed on the savings to buyers; he may have some left.
     
    Last edited: Aug 30, 2021
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  2. 5twins

    5twins XS650 Guru Top Contributor

    21,930
    15,491
    813
    Correct me if I'm wrong, but wouldn't a badly worn and stretched cam chain make the notch appear off to the right, not the left? I say this because the tensioner is applied to the backside of the chain and taking the slack out there would roll the cam backwards a little.

    Can you tell if someone else has been inside this motor already? If they have, maybe they set the cam like it is because the chain was badly stretched. Putting it where it should be may have had the notch farther off than it is now, so they moved the cam a tooth over. Obviously not perfectly aligned, but closer than one tooth over.

    Carefully examine the front guide. They need to be aligned (perfectly vertical) when mounted and many I've run across weren't. This makes the chain run across the guide at an angle and wear off the edges .....

    [​IMG]

    [​IMG]
     
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  3. Raymond

    Raymond XS650 rider & fettler XS650.com Supporter Top Contributor

    Uhm, I wasn't sure of the orientation of the engine in post #56, thought we might be looking from the advance / r/h end which would mean the cam is rolled back a little. But I'm probably wrong.
     
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  4. 5twins

    5twins XS650 Guru Top Contributor

    21,930
    15,491
    813
    You see that notch on the cam when looking from the points side - if the cam is installed right.
     
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  5. Jim

    Jim Beyond the edge is the unknown. Here be Dragons XS650.com Supporter Top Contributor

    A visual on what one tooth off would look like.


    cam timing off.png
     
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  6. sweatybetty89

    sweatybetty89 XS650 Addict

    About to order some parts have the top end of wondering how I know if I'm needing o/s rings.
     
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  7. Jim

    Jim Beyond the edge is the unknown. Here be Dragons XS650.com Supporter Top Contributor

    Here's the top end thread in Tech. It explains how to measure the cylinders. Do that and compare yours to the book values.
     
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  8. 5twins

    5twins XS650 Guru Top Contributor

    21,930
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    ..... and you measure the ring end gaps. Usually, due to a combination of cylinder and ring wear, you find the gaps too big .....

    [​IMG]

    If the bores are still in spec, you could just replace the rings if their end gaps are too large. If you want nice, tight end gaps, get 1st oversize rings and file the end gaps to the minimum spec (.008").
     
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  9. sweatybetty89

    sweatybetty89 XS650 Addict

    This I understand.
     
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  10. Jim

    Jim Beyond the edge is the unknown. Here be Dragons XS650.com Supporter Top Contributor

    That info's also in the link I gave...


    10.jpg
     
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  11. sweatybetty89

    sweatybetty89 XS650 Addict

    I was going to take some time to read the thread tonight. I'm ordering parts Thursday defently going to read it before then.
     
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  12. sweatybetty89

    sweatybetty89 XS650 Addict

    Slid my ring in and was able to get feeler gage of .010 in to slot. I assume I'm needing to go to one of the o/s sets?
     
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  13. Jim

    Jim Beyond the edge is the unknown. Here be Dragons XS650.com Supporter Top Contributor

    The book calls for .008" to .016" for the top 2 rings.

    * (.0079" actually, I rounded up)
     
  14. 5twins

    5twins XS650 Guru Top Contributor

    21,930
    15,491
    813
    Yes, the ring is still in spec so you could re-use it. So far, I've only rebuilt one that still had in spec rings, and we re-used them. That bike has been running fine for a good ten years now. Normally, I find end gaps up in the 20's, lol.
     
  15. sweatybetty89

    sweatybetty89 XS650 Addict

    Got all the parts going to attempt to tackle it tmrw wish me luck. Found a guy selling a 75 in real decent shape may buy it tmrw too
     
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  16. sweatybetty89

    sweatybetty89 XS650 Addict

    So got my motor all buttoned up and ready to put back in the frame. Sorry it has been a while since last post life and shit. Ya know? Well I got the bb magnet system mounted in my cam. I'm just wondering how I hook up this coil I've read a few things and am just wondering where wore that are coming from the stator plate. There are 5 wires on the box and 2 coming from the magnet pick up that replaced my braker points. So red goes to positive on coil spliced in with hot red/white from o.g harness. Black goes to negative and white is my ground. The other 2 are black/yellow and something else(I'm at the house now bike is at the barn or I'd look) the instructions say these go to the stator plate. Is this from my pig tail coming off my motor or do these connect to my magnet pick up. I suck at wiring just FYI.
     
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  17. sweatybetty89

    sweatybetty89 XS650 Addict

    Pretty sure color photos figured it out for me. jeez I'm a dumb ass some times:doh:
     
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  18. grizld1

    grizld1 Grumpy old man Top Contributor

    Remember, lining up the white spot on the Boyer magnet with the hole in the timing plate only gets timing close enough to start. Be sure to follow up with a strobe. For some reason guys tend to line up hole and paint mark at TDC. Big mistake, Boyer marks should be lined up with engine timing marks at full advance.
     
    Last edited: Oct 14, 2021
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  19. sweatybetty89

    sweatybetty89 XS650 Addict

    so i just got my motor back in to my bike. i put the new ignition in its a b.b. blue box. there are 5 wires that come from that box. white; ground, red; to my red/white tracer and also to my positive on my terminal, black; to my negative on my terinal, black white tracer; to magnet pick up, yellow black tracer; to magnet pick up. so i hooked it up correct from what i can see. im getting 12 v + on my battery when it is checked. im getting power to both the sides of the coil on the neg and the pos. I am not getting spark. is there something i am missing. am i suppoused to have power coming from blue box to magnet pick up plate???? any help will help
     

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