Greetings forum members, I was on craigslist a few weeks ago and decided, "screw it Im gonna buy a little 80 2 stroke to rip around on for friends to ride". So low and behold 340$ later, here I am with a 1983 RM80. Didn't run when I picked her up but fresh premix and cleaned the gunk and varnish of 30 years out of the carb and she fired 3 kick. Original seat, faded plastics but other than that original. So I think it was a good buy. Chain snapped on third day so got a new one and its working great. Leaks tranny fluid and coolant out of the right side water pump and clutch gaskets but only a few drips every day so I really dont mind topping off the rad and tranny before every ride. Its pretty much what I expected for a 31 year old bike. Anyways heres the only issue, sometimes when Im flying in 6th or 5th it will just cut out full throttle just wuuwuwuwu then after a sec BRAAP it comes back to life. It also will cut out and oscillate in revs on and off when full throttle in neutral. Im 99%sure its running a bit rich because Im at higher elevation but Id rather have that than lean since I am riding it very hard to carry my weight. Because of this if you're not on the gas or lugging it it will foul. It would not start one time, So I pushed it in gear and eventually it started. Idk if that is a common way to "unfoul" the plug but every time it has fouled I have been able to get it restarted by pushing it. I replaced the plug and it ran fantastic for a few minutes and did not cut out or do the weird neutral rev thing but after a bit of riding it started doing it again, not as bad as the fouled plug but not as good as when it was fresh fresh. I did a plug check and it looks pretty good. Im running lucas oil semi synthetic at 32:1 and 91 pump gas with some generic octane boost (add it to all my gas) and atf in the tranny. My friends old 96 RM80 did a similar 'pulse rev' when full throttle but this one seems to cut rather than just 'pulse'. Anyways sorry to ramble but if theres anything contributing to these issue or anything else that is common with these bikes let me know. thanks!