650 starter
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Thread: 650 starter

  1. #1
    Senior Member DenH's Avatar
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    DENIS
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    650 starter

    Hi all.has anyone any experience of the electric starter on a 650s tornado,mine spins but doesn't engage with the engine,not sure if it's not spinning fast enough or if it failing to engage with something ? Any advice or info gratefully received.
    when i was young i was very indecisive,now im older im not so sure.

  2. #2
    Senior Member R Powell's Avatar
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    Richard Powell
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    Hi Denis, some times they stick when not used regularly. Try jump starting from a car battery, that should spin it up faster and make it engage. I once found using a different oil made this problem worse!
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  3. #3
    Senior Member DenH's Avatar
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    Quote Originally Posted by R Powell View Post
    Hi Denis, some times they stick when not used regularly. Try jump starting from a car battery, that should spin it up faster and make it engage. I once found using a different oil made this problem worse!
    Thanks for the tip,it crossed my mind to try jump starting it but was afraid I'd burn something out !.
    when i was young i was very indecisive,now im older im not so sure.

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    Member
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    Mark Hollingsworth
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    I think I had to replace the sprag clutch on my 650 when I owned it (back in the 70s).

    The engine is quite easy to work on- except every bolt seemed to be torqued to one million foot pounds.
    I had a bent shift fork, I popped the engine out, flipped it upsidown and pulled the bottom off. Easy to replace the bad parts.
    (Well, that is my memory- who knows how many troubles I had I am now glossing over).
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  6. #5
    Senior Member
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    Cam Douglas
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    Quote Originally Posted by DenH View Post
    Thanks for the tip,it crossed my mind to try jump starting it but was afraid I'd burn something out !.
    As long as you use a 12V battery and connect it he right way around to jump start it you won't burn anything out.
    Well, If you crank it on the starter for 10 minutes you could cook the starter motor or its power cable, but that's true whether it's connected to a jump start battery or not.

  7. #6
    Senior Member DenH's Avatar
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    Quote Originally Posted by Lotus54 View Post
    I think I had to replace the sprag clutch on my 650 when I owned it (back in the 70s).

    The engine is quite easy to work on- except every bolt seemed to be torqued to one million foot pounds.
    I had a bent shift fork, I popped the engine out, flipped it upsidown and pulled the bottom off. Easy to replace the bad parts.
    (Well, that is my memory- who knows how many troubles I had I am now glossing over).
    I think I might have to strip it because the kick start jams down sometimes and I can see wear on the teeth.
    when i was young i was very indecisive,now im older im not so sure.

  8. #7
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    the sprag clutch bearing is the same as in the bevel ducatis so suppliers for those have them but can be a bit pricey. If it is not engaging the teeth are not throwing out for some reason.
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  9. #8
    Senior Member RichardJ's Avatar
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    Hi,
    If you are lucky the problem will be caused by old oil gumming up your sprag clutch. If you prize it open you can wash it out so that the teeth are free to move. I had a similar problem on my 654 and I found that the starter only worked when the engine was warm. I got around this on cold days by warming the oil with a camping stove under the sump. Obviously this was never going to be a long term solution to the issue so i removed and cleaned out the sprag clutch.
    Sadly , although t was better, it still did not work every time and need to be replaced. It was probably worn because it had been spinning without engaging.
    A healthy sprag clutch will bite even when turned very slowly. Using a bigger battery won’t help. In fact, spinning it faster when it is not engaging is likely to wear it faster.
    My advice would be to remove it, open it up and clean it thoroughly. When you re-assemble it, you should find that it locks when turned by hand. If not, yo will need to replace it.

    Good Luck.
    Richard.
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  10. #9
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    I have a similar problem with my starter. I attempting to remover the generator rotor the manual tells me I need a "Parallel Pin". I am guessing from the instructions and a few measurements thet this is just a 6.2mm x 60mm rod. Can anyone confirm this? I dont want to make one and then get it stuck or ruin the inner thread.

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