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April 10th, 2007, 06:35 AM   #1
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spark in relation to cranking speed.

Hi we have a 2002 650 motor, which has never had the starter or kick fitted as its always been a road racer.
Now this bike is being put on the road, with the starter fitted, but have a problem with no spark at cranking speed.
Uprated the starter, starter gears, sprag clutch etc. Even using a 35amp battery, cranking speed is still no better then 360rpm.
We need min 450rpm to get a spark.
Have tried severally complete ignition systems from running bikes, and mine on theres.

Amazing all the other bikes had there electric starters removed!

My query is, is there any way of amplifying the the cdi at crank speed, or any other starter motor that spins faster.

Any other ideas would be a welcome help.

Thanks Sara
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April 10th, 2007, 08:14 AM   #2
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you can purchase a 04 onwards starter motor and adaptor from the dealer this is a much stronger unit and should spin the motor fast enough to start.

cheers doug
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April 10th, 2007, 08:25 AM   #3
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hi and thanks for getting back so quick, we have tried what you surgested with no luck.. but if you come up with any other ideas, please post asap thanks
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April 10th, 2007, 08:38 AM   #4
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I suppose you have tried different CDI-boxes, spark plugs and hats? No mismatch with MX vs street flywheel/stator?
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April 10th, 2007, 08:49 AM   #5
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hi, yes we have tried the enduro and the supermoto setup of running bikes of our friends, still no joy. please anything else. Its also not a compresion issue as the plug is removed too. Even Dave Clark racing who are friends are still scratcin heads on this matter! agh!!!
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April 10th, 2007, 08:50 AM   #6
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P.S im a girl, i dont have balls hehe
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April 10th, 2007, 09:46 AM   #7
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Hi
So you say its not a compression issue ...... have you taken jump leads directly to your starter motor, with the plug out and the manual decompressor pulled in ?
Have you removed the starter motor and listened to the approximate RPM, for comparison ?
When you do spin it as normal ... does it seem to slow down on the compression stroke, or is it constant ?
Keep on testing
And let us know how ya get on
Regards
Ady
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April 10th, 2007, 09:47 AM   #8
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you need to speak to our resident ectrical expert - sparks. Pm hm with your question.

the only ote tip i have is to reduce the p;ug gap to .024".

regards

Taffy
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April 10th, 2007, 09:53 AM   #9
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well no spark even without the plug on, just the ht lead end on the engine with nooooo spark, works on mates still!!!
there aint much on the wiring on these things so its totally confusing.
all the above done. Will venture to the electrical expert for more advice. Thanks kind sir
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April 10th, 2007, 10:37 AM   #10
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sara

so you're saing that this engine was fine in a roadracer? correct? or that the whole bike was a roadracer and has been conveted to road use?

well i would give it a tow start first. stick a rope around the left footrest and pull it along in third. having established that it runs you have to keep it running and check a few things on it/adjust the carb, the ignition timing. then try and start it as soon as you've stopped it etc.

does the bike have an ignition key and clocks etc?

regards

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