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Motorcycle Repair/timing 1968 ym1 yamaha


I've got a 1612 mile 305 YM1 and I believe the timing was 1.8mm before TDC can you confirm. Of course I can't find a service manual for a bike this old and I've forgotten the specs for this bike 'cause I'm older!  
Thanks          TD

Hello Taylor,

Although this is way before my time, I did some digging and found a lead.
It's 19mm +-1 (18-20mm).
Further more, the technician who provided the info, told me that this bike works best if set to 19-20mm.

I hope I was helpful.

Best Regards,

Motorcycle Repair

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Lazaros Ampatzidis


I can help you on EVERY issue involving POST-1980 Japanese Motorcycles plus KTM and Husaberg. My field of expertise includes Engine, Transmission, Fuel system (carburation & EFI),Electrics and Electronics. Maintenance, repair and tuning. Road and off-road suspension tuning. Please don't ask me about non-Japanese Motorcycle, especially American built on which I have low to zero experience.


I'm a rider and hobbyist since childhood. 25 years motorcycle workshop mechanic.15 years motorcycle racing mechanic. In order of experience high to low:Kawasaki,Suzuki,Honda,Yamaha,KTM,Husaberg.

Hellenic (Greek) Technical School.Internal Combustion Engines Engineer. Automotive Electronics.

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