Trials Australia Forums

Hi i have recently purchased a 1981 Montesa Cota 200 trials bike and new to this forum. I was wonderin if someone knew where i could purchase a new ignition coil or new of a way to repair the high tensile lead as it is completely severed. any help would be much appreciated. thanks.

If you carefully dig arround the broken end I have managed to sloder on a new copper HT wire and the build up a new section in epoxy to hold it all in place.
Is it a pionts ingition system or is it a Motoplat? If it's pionts ignition then any other pionts Magneto coil will work. Most of the trials Bultacos and TY Yamahas coils will do the job.

the ignition coil is a motoplat one and the whole coil needs replacing cause there was no spark from it before i severed the HT lead. Ive had a look on ebay for a new one but they are so expensive. Is there any other model like suzuki, yamaha that would have a coil to replace it with because the price is so much cheaper?

If its CDI I doubt a jap coil would work.

I'm lead to believe Small Coil Rewinds in Vic can fix motoplat coils, at reasonable cost

Nothing other than Motoplat will work. It could also be the stator assemble that has failed if there is no spark.
Send the hole lot to Small coil rewinds and they can test and or repair.
If you can find someone to borrow a coil from you could test the stator before going to the trouble of removing it.

What area do you live in?

turns out the bike does have spark and was running before the ignition lead was severed and the coil inside the engine case is all fine and no problems. When it was running it only ran for about 10-15scecs then cut out but i think that was due to the fouled plug and the fact that the ignition lead was almost completely cut at that time. im about to join a new section of the lead together and change the spark plug and hopefully it will fix it. i live on the sunshine coast to sending the parts to VIC makes it a little more expensive.

well i joined the lead but still same problem, the bike will run for about 10-15secs and then cut out. i know the key sheared and was replaced by previous owner and im wondering if the timing might be slightly out. any ideas?

cam46nsr wrote:well i joined the lead but still same problem, the bike will run for about 10-15secs and then cut out. i know the key sheared and was replaced by previous owner and im wondering if the timing might be slightly out. any ideas?

If you have a timing light that clips over the plug lead. Start the motor and watch the flashing light, if it keeps flashing as the motor dies then it is not the ignition. The timing would have to be out a long way to stop it running and then it wouldn't start. If the key has broken again it could cause a few problems. Take off the mag cover and with the motor at TDC put a felt pen mark on the flywheel in line with some reference on the case run the motor and check it hasn't moved after it stops again.
People in the past have out up a Video of there bikes playing which would make it a lot easier to diagnose.