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Help with 1975 Yamaha ty 175

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So my 1975 ty175 will start right up after sitting for about a day but after riding it for a bit the bike will die and not start again for a few hours/overnight. If anyone has suggestions about what the problem might be it would be greatly appreciated!!

Last time I had a problem like that it was a bad ignition coil.  Could be a bad spark plug as well.

 

good luck.

1 hour ago, jonnyc21 said:

Last time I had a problem like that it was a bad ignition coil.  Could be a bad spark plug as well.

 

good luck.

Yes a bad coil will heat up after use then tip over,plugs well I find in lawn movers ,chainsaws,scooters and ride -on mowers they don't appear to last long....a fuel quality thing,not really sure?.

Good point, I forgot about the fact that a 75 TY175 would have points.  

I agree with lineaway, condenser and points then check your coil.   

Have you tried to loosen the fuel cap when it dies ?

Guy

  • Author

Where is the condenser located? I just put a new ignition source and ignition coil on the bike. It has a fresh spark plug also.

Depends where the previous owner fitted the condenser, it could be next coil or still in original position behind flywheel/mag. Check carb breather pipes not kinked, crushed or blocked. Fuel tank cap breather is this clear as guy53 suggested. Full ignition check, contact face condition (dark royal blue colour on contact faces indicates condenser ? Air filter is this clean and unrestricted/ bunged up with crap etc. Is exhaust relatively clear and not carbon loaded or oiled up. Piston is compression good and not too noisy piston slap wise, rings could be gummed up and causing running issues. 

At the end of the day diagnosing running faults etc is very difficult at a distance but hopefully you have enough to go at. Let us know if you sort the problem??

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