jap engine no spark

Ive recently bought a jap engine, which i intend to restore. My knowledge of engines is very limited, and i could do with some help. There is no spark coming from the plug, but there is a current coming through the ht lead because i got a good shock from it! any ideas why there is no spark
Thanks.

Sparrow,
Try a replacement plug, is there a plug cap attached to the end of the ht lead? Might be worth changing that.
Is there a spark at the end of the ht lead if you remove the ht plug( if fitted), hold about 1/4" from the engine casing while cranking the engine...

No spark could mean a duff coil....

I was going to say the same as Chippie, I have had several of the supressor plug caps fail on me so I don't bother using them now.

Pete.

Thanks for the replys, i removed the plug cap from the ht lead, and there was a small spark, so i tried a different plug cap and spark plug, but there was still no spark coming from the plug. Any ideas?
Thanks

Can you try another piece of HT cable?
Check the condition of the points, are the faces clean? Are the points correctly gapped?
Try changing the condenser, if all of that fails then new coil......

I have found with these small Jap's that after a period of standing idle rust etc forms on the flywheel magnets and coil contact. I would remove the flywheel (they are keyed but on a parallel shaft so USUALLY come off ok!) and clean the inside of the flywheel and contact on the coil. Also clean the points and then refit the flywheel and try again.

Pete.

Thanks for help, i will try your ideas tomorrow, and will report back! I did try to remove the flywheel earlier, but it didnt want to come off. Is there a special way of removing it?
Thanks

You may need to use a puller...... You could try dowsing it Plusgas or similar release agent ortry warming the area around the shaft with a hot air gun

Thanks for the help, i cleaned the points up today, and got a decent spark, so pulled it over, and it fired second pull! Im really grateful for all the help!

sparrow wrote:Thanks for the help, i cleaned the points up today, and got a decent spark, so pulled it over, and it fired second pull! Im really grateful for all the help!

Result....

I love a happy ending.....

^^^^^^^Ditto! Onwards and upwards.

Pete.