Novabiker

I found the part number. Its 146-24523-00 but my local Yamaha dealer could not find any parts listings for a YM1 in his database. I found that a UK site carries the part and sells it for $10.00.

Thanks fo responding. I have the YM1 parts manual but it does not show a part number for the four hole petcock gasket. I was thinking someone may have found the actual part number or a one from another bike that may fit. It has a 24mm diameter. I found a YM1 petcock kit on ebay for $25.00 but I only need the four hole gasket.

Hello, Does anyone know the Yamaha part number for the YM1/YDS3 four hole petcock lever gasket? And where I could find one? Thanks

Hello VMAX540, I am having the same problem on my 1973 DT3 and was wondering if you found a fix. Heres what I have done for troubleshooting so far: - checked the battery voltage with the engine not running and its at 5.9 volts - checked the charge rate and with the engine at 2500 RPM its at 6.1 volts, at 5000 RPM it goes up to about 6.9 volts. - checked the AC voltage at the yellow wire coming from the magneto with the engine running and key in the "lights on" position. At 2500 RPM the voltage is about 12.5 volts and at 5000 RPM its around 16.5 volts. The yellow wire remained connected during the check. - checked AC voltage with the key in the "lights off" position and the voltage is around 16.5 volts at 2500 RPM and 28 volts at 5000 RPM. - checked the AC voltage at the headlight blue wire and at the headlight socket and the voltage is the same as above. - checked the continuity of the handlebar headlight switch in both the high and low positions and it seems to be correct. I did not have a sealed beam headlight installed during the above checks since the bulb was blown and I did not want to risk putting in a replacement while I had such high voltage. I have read the threads on installing a 6V voltage regulator and will consider that as an option but the 'purist' in me says that if it didn't need one coming out of the factory then I should be able to restore it to the same condition. (but I do have a limit on how much pain and suffering I'm willing to endure to make that happen Would welcome help from anyone who has any ideas on other trouble shooting I can do to find and fix the problem.