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OK i got this home, in the back of a Honda Odessey. Gotta pull the carb i think.

1984 Tri Zinger 60 The Yamaha Tri Zinger 60 was a 59-cc recreational three-wheeler that went down in history as Yamaha’s first youth ATV. With its shaft drive, tethered emergency stop switch, adjustable speed limiters, and fully automatic transmission, the ATC has won the approval of both parents and youngsters.

Here's another one close by me for sale, Yamaha Tri Zinger, $2500., Looks like he has another Honda classic in the background.

That looks OK from what I can see . No sign of any leaks now so I'm going to leave it alone.

Well; I cannot say that I know exactly what I did but the unit is operating 100% now. I replaced the angle sensor and tried going through the re-programming but wasn't successful. I downloaded the shop manual and went through the motions again. While moving the shifter trough the gates from R to L it got stuck in L. I rolled it backwards by hand and got it out of L. I started it and backed up noting the sputter was still there but took off down the drive in LOW. I noticed it seemed be changing ranges but couldn't swear to it nor am I sure it's able to do this in LOW. Took it back to the barn and turned it off and repeated the procedure one more time but also checked a few connections out back which seemed fine. Started it up and it backed up with no sputter. Put it in LOW again and dumped the throttle. Stopped and shifted into ESP. The gauge showed ESP and 1st gear. Not looking a gift horse in the mouth I went for a quick ride running up and down the range. It shifted fine. Tried D1 range and that worked too. Went back to ESP and that again functioned perfectly. All I can figure is that maybe I pushed the right buttons or the Angle Sensor was indeed bad. I take no credit for the fix because I couldn't repeat it. I MAY pull off the "motor" that controls the transmission and clean it. I appears from some videos I've seen these get pretty nasty. Mine is untouched since new. Otherwise I'm leaving it alone!

Just a little milk and no sugar thanks. Anyway it appears to be sorted this time. The drill do the trick. I polished it again after drilling incase there was a burr left. Test it in the bike with a full tank a number of times and it perfect. Thanks everyone.

A result. I used a cotton bud and some copper grease to polish out the seat. Irs holding fine now. Thanks for everything Misterclean

What do you mean you’re selling a 300?