Help Please!

1179 Views 3 Replies 3 Participants Last post by mike warren, Feb 20, 2008

Northbay

Discussion Starter · Feb 25, 2007

Ok, I've had this older (79-80) Yamaha 340 for about a year. I was riding this winter and it ran great as always until I put it in the garage for about 2 weeks after my last ride. Nothing was wrong when I parked it so I was all suited up for my next ride, when she didnt start. No Spark. I checked quickly under the hood for loose connections, etc, but nothing. When I went to fix my problem the next day I checked everything, all the switches and such, but still no spark. Replaced the coil and CDI, still no spark. Took apart some wiring, and thought I had stumbled onto my problem, because it was BAD. I cant find a wiring harness so I bypassed all the wiring and have my CDI/coil wired directly to the engine. I was so happy to see spark after that. But the thing will still not start. The spark is not the best, but it should atleast start. I have no idea what else it could be? what stymies me worst is it was running awesome and then nothing? I bought a flywheel puller, could the stator go instantly like that? I dont really have any more money to keep buying parts i dont need, so any help would be greatly appreciated. happy sleding... btw, anyone interested in a 79 kawi drifter340?

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HYDRAULICYAM

· #2 · Feb 27, 2007

Make sure no critters have nested in the pipe....but they normally will fire
on some squirted premix but quit or just idle , It builds back pressure in the
muffler and the fuel pump stops working as well if the bung is tight enough .
Had a nest /seeds/ etc in my 74 TL on Sunday .It had made its way up to the
main muffler and may have had debris all the way to the ports until I fired
it up ...No poof , poof from the tail pipe .
Otherwise , good luck..
RON

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Northbay

Discussion Starter · #3 · Mar 1, 2007

Make sure no critters have nested in the pipe....but they normally will fire
on some squirted premix but quit or just idle , It builds back pressure in the
muffler and the fuel pump stops working as well if the bung is tight enough .
Had a nest /seeds/ etc in my 74 TL on Sunday .It had made its way up to the
main muffler and may have had debris all the way to the ports until I fired
it up ...No poof , poof from the tail pipe .
Otherwise , good luck..
RON[/b]

Thanks for your help. I bought a flywheel puller and cleaned up the trigger coils. She started right up. Now all i need is cold weather.

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mike warren

· #4 · Feb 20, 2008

Ok, I've had this older (79-80) Yamaha 340 for about a year. I was riding this winter and it ran great as always until I put it in the garage for about 2 weeks after my last ride. Nothing was wrong when I parked it so I was all suited up for my next ride, when she didnt start. No Spark. I checked quickly under the hood for loose connections, etc, but nothing. When I went to fix my problem the next day I checked everything, all the switches and such, but still no spark. Replaced the coil and CDI, still no spark. Took apart some wiring, and thought I had stumbled onto my problem, because it was BAD. I cant find a wiring harness so I bypassed all the wiring and have my CDI/coil wired directly to the engine. I was so happy to see spark after that. But the thing will still not start. The spark is not the best, but it should atleast start. I have no idea what else it could be? what stymies me worst is it was running awesome and then nothing? I bought a flywheel puller, could the stator go instantly like that? I dont really have any more money to keep buying parts i dont need, so any help would be greatly appreciated. happy sleding... btw, anyone interested in a 79 kawi drifter340?[/b]

what do you have for compresstion in the cylinders must be over 100psi and the cly.s must be +/- 15%

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