Honda Spree and Elite 50 Forums

I replaced the CDI box on my 1985 nb50m, and I've still got what I think is a weak spark with a NEW spark plug. Yes, I did the electrical checks on the ignition system and everything checked out within specs. I tried a small motorcycle coil in place of the one on the bike and that didnt help either. The only thing left seems to be the stator. Could it be bad? The flywheel magnets and stator coils were slightly tarnished with rust, but wasnt bad. The flywheel key is undamaged and the ignition on/off switch works like it should. What else could it be? I've got a minarelli engine on a minibike with points that puts out a hotter spark than this scooter.

Does it run?

The stator can be checked pretty easily with a multimeter and by unplugging from the harness then checking for resistance. See service manual for specs...

tricolour wrote: I've still got what I think is a weak spark with a NEW spark plug.


Yes, I did the electrical checks on the ignition system and everything checked out within specs.

If you did all the checks , you should be OK
Is the weak spark affecting your scooters ride?

Check the gap on the plug.
Check resistance from battery ground to engine block.....it should be zero Ohms. (or really close to it)

Can you tell us more on how you think the spark is weak?

How well does the engine run/ perform?

Down on power?

Trafficjamz wrote:Check resistance from battery ground to engine block.....it should be zero Ohms. (or really close to it)

It has to be a ground issue just like tospreeornottospree's 87