grotto
23rd November 2009, 18:26
I've got an old Yamaha TY50, mid-late 1970's, points ignition.
Wiring has been modified (no battery, lights, etc.)
I can't get a spark.
It was wired up with the black wire from the engine to the coil, HT lead to the plug, real simple but was it correct? (I don't get a spark).
The points open and close when engine is kicked over.
Using a multimeter there is minimal voltage (under 1 volt) at plug cap when engine is kicked over.
There are 4 wires coming out of the engine;
Black, Green, Yellow, and Green/Red.
There is another wire (light blue) in the same bundle, which doesn't go anywhere but has a terminal on one end which looks like it would screw onto something (maybe an earth?).
I was going to check the stator coils, but had a go at removing the flywheel/cover with a gear puller, but it seems to be on really tight, and I'm nervous about breaking something (I don't have a manual to check if anything other than the nut on the end of the crank hold it on).
I'd like to wire it up without a battery to get spark first of all.
Once I've got spark, if I can get it to run (it's only got 85 psi compression) I'll have a go at wiring in a battery.
The plan is to work on it over the holidays with my kids, and hopefully they'll be able to learn to ride a bike with gears, and gain a bit of hands on experience at bike repairs.
Problem is I'm a bit stumped at the moment as to how to proceed.
I don't have much spare cash, but have plenty of bits and pieces from other bikes around.
I've attached a couple of photos for reference
Hope someone can help!
Wiring has been modified (no battery, lights, etc.)
I can't get a spark.
It was wired up with the black wire from the engine to the coil, HT lead to the plug, real simple but was it correct? (I don't get a spark).
The points open and close when engine is kicked over.
Using a multimeter there is minimal voltage (under 1 volt) at plug cap when engine is kicked over.
There are 4 wires coming out of the engine;
Black, Green, Yellow, and Green/Red.
There is another wire (light blue) in the same bundle, which doesn't go anywhere but has a terminal on one end which looks like it would screw onto something (maybe an earth?).
I was going to check the stator coils, but had a go at removing the flywheel/cover with a gear puller, but it seems to be on really tight, and I'm nervous about breaking something (I don't have a manual to check if anything other than the nut on the end of the crank hold it on).
I'd like to wire it up without a battery to get spark first of all.
Once I've got spark, if I can get it to run (it's only got 85 psi compression) I'll have a go at wiring in a battery.
The plan is to work on it over the holidays with my kids, and hopefully they'll be able to learn to ride a bike with gears, and gain a bit of hands on experience at bike repairs.
Problem is I'm a bit stumped at the moment as to how to proceed.
I don't have much spare cash, but have plenty of bits and pieces from other bikes around.
I've attached a couple of photos for reference
Hope someone can help!