My first three wheeler.

[jamieghester]

1981 ATC 70 I got for 100 dollars. Struggles to run, has a rusted tank, but the plastics are in awesome shape. Frame and forks are straight, the tires hold air, but it has a very weak spark.

I will be cleaning it up and working on it tomorrow to try to get it running. If anyone has any tips on what to look for, I would greatly appreciate them.

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[mgusciora]

Always start the the carb. Take the bowl off and see how it looks. In my experience depending how clean it is gives a good outlook on how easy it will be to get running. I don't know if those have point or a coil.... either way I would say take a look at the stator if it has weak spark


~Matt Gusciora

[Lbox]

Nice buy!

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[mgusciora]

And obviously DO NOT run in the tank till the rust is fixed


~Matt Gusciora

[mrmclooperson]

Time to pull out the trusty points file and adjust some points.

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[jamieghester]

Turns out that the guy I bought it from doesn't know how to test if a plug is firing, plenty of spark, definitely enough to get my attention​.

I pulled off the tank and it is rough, the inside is very rusted but the hole on the side is fixable, I plan on getting some epoxy and tank liner, and see what I can do to patch it.

The bike will run, but only if I manually choke it, I made my own gasket to go on the bottom of the intake manifold so it is possible that there is a leak. The valves are set about right and the carb is clean. Any ideas on what to check?




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[jamieghester]

She's alive! With the help of some break clean and my beer bottle gas tank, I was able to take my first ride. It won't run without the choke being on, but it's a start. It smoked a lot at first, but quit after about 5 minutes of riding.

Found that I had a leak where the carb mounts to the manafold, electrical tape will have to work for now.

So glad to hear the engine run.

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[Henrii]

Nice buy ! It looks in good condition but there is a lot of work to make it shine. good luck !

[mgusciora]

If it only runs with the choke the carb is either clogged or needs some fuel/air adjustment


~Matt Gusciora

[jamieghester]

Found that I am missing gaskets where the carb mounts. Going to pull the carb and clean it, again, and make some gaskets this afternoon.

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[jamieghester]

Decided to check compression just for fun and it only has around 60 psi. Guess it's time for a top end rebuild.

Might be a little bit until anything new happens.

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