motorbike ignition fault

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Joined: Tue Oct 02, 2012 6:16 pm
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Re: motorbike ignition fault

Post by Chris_W » Tue Oct 02, 2012 6:19 pm

I would have thought that if it had been a cam issue, either timing of the cams or the "wrong" cams it would be the same on all cylinders and not just 2 or 3?

Or maybe that's just me not being clever... :oops:

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Fat Freddy
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Re: motorbike ignition fault

Post by Fat Freddy » Wed Oct 03, 2012 7:16 am

Not sure I understand the underlined part ?
I think I possibly misunderstood your question and was remarking on the entire ignition event. But possibly where the clamp is in relation to fault will yield different results.
For example the rotor notch on the coil lead but not the plug lead. Although wasted spark is different again.

Nice animations though Rob.
Wish I had read your posts earlier. But here's a few images from a wasted spark system that I had yesterday that had very high resistance in the secondary coil.
At idle it appears very hashy. Underload it becomes very chaotic - each event different from the next. I couldn't say weather the partially fowled plugs were contributing to this.

Personally I find ignition hard at the best of times.

Under load
At idle

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Re: motorbike ignition fault

Post by Robski » Wed Oct 03, 2012 10:42 am

Personally I find ignition hard at the best of times.
Yes it is an interesting subject to get your head around :D

It's obvious there is a difference of a direct short to ground & a resistance to ground & a high resistance situation, if you check my case study on the Peugeot 206 you will see a similar capture with resistance to ground in a spark plug.

Thanks for the comments, always good to have such discussions as it's kind of a refresher & gets the mind active 8)

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