NO SPARK after rebuild

8 replies to this topic
  • motodiver13

Posted April 06, 2010 - 02:11 PM


I just finished my rebuild. All is back together and AGHHHH no spark. I am in need of a little direction on where to start looking.

The bike was a basket case but ran untill it was hydro-locked and bent the crank. I do have a used flywheel and stator from e-bay. It's been a 5 month project and I'm so Thanks

  • motodiver13

Posted April 07, 2010 - 08:18 AM


Well found the problem. Coil wire not attached. DOH. But now it won't start.

I YZ timed it when reassembling so I'll double check the timing is correct. Would I get even a putter if the timing was off a tooth? I am not even getting a cough.

  • gsa102

Posted April 08, 2010 - 05:58 PM


On the old TT500s we used to advance the cam timing 1 tooth on purpose for more power, but it made it harder to start.

My guess it that it should run even if 1 tooth off. But you should be real close if the valves are not hitting the piston when you kick it over.

I would try a little shot of gas in the carb, but that's just me.:thumbsup:

  • motodiver13

Posted April 08, 2010 - 06:56 PM


So sometimes I wonder......

I pulled the timing cover off to double check the timing and :thumbsup: At some point the timing ended up completely backwards. At TDC my cams were facing in toward one another. Double:bonk:.

I will reinstall tomorrow and try again. Please tell me I didn't do any irrepairable damage... please. Would the piston hit the valves if the open at TDC?

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  • gsa102

Posted April 09, 2010 - 05:14 AM


180 off is still ok, It just won't run. It would lock up if the valves hit the piston. Trust me, I know.

Wait a second - did you know that the crank goes around twice for every time the cams go over? Your cam timing should still be ok. I don't know what triggers the spark - it could be out of time.

Edited by gsa102, April 09, 2010 - 05:18 AM.
New info

  • motodiver13

Posted April 09, 2010 - 08:20 AM


It was backwards with the timing marks lined up at TDC. I still really don't know how I screwed that up.

  • wartsnuff

Posted April 09, 2010 - 09:28 AM


where we at ? did you get it to start ?


  • motodiver13

Posted April 09, 2010 - 10:18 AM


Not yet. Have to button up the cam caps and put the valve cover back on. Should be today it tomorrow. I will keep you posted.

  • motodiver13

Posted April 11, 2010 - 03:33 PM


OH YEAH!!!! Got her fired up today!!!:thumbsup: I only had time to rip around the block a few times and jump off the small wall in the yard but I LOVE IT:thumbsup:

I need to dial in the carb a bit but it is not too far off. Also need to put on my new sneakers, got a set of MX51s. I can't wait to get it out and really ride.

Thanks all of you for the helpful advise and guidence. I'm sure I'll need some more soon.


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