PDA

View Full Version : My first three wheeler.



jamieghester
05-07-2017, 10:01 PM
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.https://uploads.tapatalk-cdn.com/20170508/4edb90ad33d1f3f10bc704a0c46ad707.jpghttps://uploads.tapatalk-cdn.com/20170508/aa66e467c81ba1c49186bbc974a46613.jpg

Sent from my XT1585 using Tapatalk

mgusciora
05-08-2017, 06:43 AM
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
05-08-2017, 07:16 AM
Nice buy!

Sent from my SAMSUNG-SM-G930A using Tapatalk

mgusciora
05-08-2017, 05:47 PM
And obviously DO NOT run in the tank till the rust is fixed


~Matt Gusciora

mrmclooperson
05-08-2017, 06:58 PM
Time to pull out the trusty points file and adjust some points.

Sent from my SCH-I545 using Tapatalk

jamieghester
05-08-2017, 09:34 PM
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?


https://uploads.tapatalk-cdn.com/20170509/19c0f1f17dc6669306a98ce0fcc774d9.jpghttps://uploads.tapatalk-cdn.com/20170509/ee894b478b05bdd31fee78f2fa4153c3.jpghttps://uploads.tapatalk-cdn.com/20170509/354607624bcbfd8a06c643dd8a40646e.jpghttps://uploads.tapatalk-cdn.com/20170509/69badecf7d9178329bf09d442ae42326.jpg

Sent from my XT1585 using Tapatalk

jamieghester
05-08-2017, 10:53 PM
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.https://uploads.tapatalk-cdn.com/20170509/db09985e6a71f454ef9283b4a97b15c0.jpg

Sent from my XT1585 using Tapatalk

Henrii
05-09-2017, 02:56 AM
Nice buy ! It looks in good condition but there is a lot of work to make it shine. good luck !

mgusciora
05-09-2017, 06:30 AM
If it only runs with the choke the carb is either clogged or needs some fuel/air adjustment


~Matt Gusciora

jamieghester
05-09-2017, 09:01 AM
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.

Sent from my XT1585 using Tapatalk

jamieghester
05-09-2017, 07:32 PM
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.

Sent from my XT1585 using Tapatalk