Originally Posted by motomike14
Assuming you have;
1) compression in the motor
2) spark from the motor
3) willingness to work at it
Then, it can be a good project.
Things you really need to be wary of though:
If it's sat too long, bottom end seal could go. It that happens, you're in bad shape. Tell tale sign is if it bogs down and will not clear out with low RPMs. Bottom end seals are not too expensive on these, but do require a fair bit of work.
Double check oil in the oil injector/the oil pump. Real easy for junk and rust to get inside the those tanks and create issues.
If you de-rust the tank (whatever method you use), make sure to then run an external fuel filter afterwards. Rust will continue to appear for a long time, regardless of the method you use (always parts left).
Since it sat outside, I'd spray some WD40 or similar lubricant down the spark plug hole into the cylinder. Even if the motor is not seized, that's a long time without oil going over that cylinder. Don't attempt to start it until you do that.
They are great bikes with a huge cult following. I have a 75 as well that has been converted to a motocrosser. Reliable as anything else I own and definitely more fun to ride than most. Simple to work on and any parts you need are available.
It was running a few months ago so it should still have spark, it definitely has compression.
I dont think it boggs all the time i think its usually after its been run for a while which makes me think it might be rust breaking off and flooding it.
We disconnected the oil pump when he first got it so he just premixes.
How much wd40 should i use in there? and should i kick it a few times after spraying the wd 40 before trying to start it to get the wd 40 spread around?