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Moped Riders Association • View topic - MJ50J Yamaha Towny, 1982 model

MJ50J Yamaha Towny, 1982 model

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MJ50J Yamaha Towny, 1982 model

Postby tomven1967 » Mon Jun 03, 2013 6:34 am

Hello to all!,
I'm new on this forum and am looking for some guidance. My dad gave me his 1982 Yamaha Towny several months ago. He purchased this brand new back in 1982. It has always been kept in a garage & is in excellent shape. My son & I made it a winter project to try to get it running again. We succeeded in getting it to run after performing the following maintenance and replacing parts: new air filter, new spark plug, new fuel cock, removing & cleaning the carb, new piston ring set, changing engine oil, draining the old and replacing with new 2 cycle motor oil from the reservoir. Here is our problem, we only get about 30 minutes of riding time out of it before the spark plug gets charred to the point it's black and won't produce or maintain adequate spark to keep the engine running. We've tried different spark plugs with the same results. This Towny requires leaded gas so we ad a lead substitute to the gas can prior the filling the under seat tank. Could the 2 cycle oil injector pump not be functioning properly? What is the correct gas / oil ratio for this model? I want to try premixing the 2 cycle oil in the can to see if that will make a difference. I will, of course, drain the 2 cycle oil reservoir first.

Any thoughts & comments will be greatly appreciated.

Tom
Ft. Thomas, KY
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re: MJ50J Yamaha Towny, 1982 model

Postby John » Mon Jun 03, 2013 9:50 am

Don't add lead substitutes, not needed. Just use reg unleaded 87. Disable the oil pump, block/plug lines and run 50:1 with a good synthetic 2 stroke oil. N obviously. New plug in order. Adjust carb as per the manual.
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re: MJ50J Yamaha Towny, 1982 model

Postby tomven1967 » Mon Jun 03, 2013 10:59 am

Okay. I'll do those things. What do you think is causing the plug to char up?.....too rich??....too lean??......the lead substitute?? Is a 50:1 gas / oil ratio sufficient? What is the reason not to use the lead substitute?

Thanks for your prompt reply.
Tom
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re: MJ50J Yamaha Towny, 1982 model

Postby John » Mon Jun 03, 2013 2:01 pm

You just don't need it, my guess that is what is messing the plug up. Also check and see if the choke is coming completely off. Is it an electric bi-starter type or a slide/ butterfly setup.
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re: MJ50J Yamaha Towny, 1982 model

Postby tomven1967 » Mon Jun 03, 2013 4:31 pm

I don't know what an electric bi-starter type or a slide/ butterfly setup is. It has a kick start and a manual choke located below the left handlebar grip that is actuated by my left thumb. The choke lever is connected to a cable that runs down to the carb (I guess).
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re: MJ50J Yamaha Towny, 1982 model

Postby tomven1967 » Mon Jun 03, 2013 9:55 pm

This evening we drained the gas from the tank (that had the lead additive), removed, cleaned and reinstalled the spark plug, drained the 2 cycle oil reservoir, added 2.5 ounces of 2 cycle oil to one gallon of gas and filled the tank about half way. It started right up on about the 3rd kick and ran like new. I sure hope this keeps the spark plug from getting all fouled up.

Thanks,
Tom
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re: MJ50J Yamaha Towny, 1982 model

Postby John » Tue Jun 04, 2013 5:24 am

Use a good synthetic like Ipone or Elf at 50:1. Ipone is scented. Spark plug electrode will tell you nothing of the burn as the synthetic doesn't leave a tell tale coffee colour like dino oil will when you are dialed in. Plug and or remove any oil injection lines and remove the oil pump and block off or take out its coupling driver. You don't want any air leaks to make the bike run lean and then seize.
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re: MJ50J Yamaha Towny, 1982 model

Postby John » Tue Jun 04, 2013 6:13 am

John

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re: MJ50J Yamaha Towny, 1982 model

Postby tomven1967 » Tue Jun 04, 2013 7:00 am

Got it.

Thanks!!
Tom
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re: MJ50J Yamaha Towny, 1982 model

Postby tomven1967 » Tue Jun 04, 2013 7:00 pm

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re: MJ50J Yamaha Towny, 1982 model

Postby John » Tue Jun 04, 2013 7:32 pm

John

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re: MJ50J Yamaha Towny, 1982 model

Postby tomven1967 » Tue Jun 04, 2013 9:10 pm

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re: MJ50J Yamaha Towny, 1982 model

Postby xrongor » Thu Jun 06, 2013 12:12 pm

as you probably already know, the towny is basically a QT50. all mods for that bike will apply, however you do not need to regear the rear end.

i would take the exhaust pipe off and throw it in a campfire to burn everything out of it, then sand it and paint it with high temp bbq paint. Yes i am completely serious :D I do this with both my bikes every year whether they need it or not. Cook it for an hour or two.

When you have it off, check the exhaust port on the cylinder and clean it out as well.

good luck!
randy
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re: MJ50J Yamaha Towny, 1982 model

Postby tomven1967 » Mon Jul 08, 2013 6:31 am

I finally got the CDI & ignition coil replaced. I also tweeked the carb.....been fiddling with that since day one!! It started right up. Ran well for about 30 minutes, then stalled at a stop sign. Was easily able to get it started again. Will keep tweeking the carb. It runs better now than it did.

Tom
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