Have a new Yamaha project, Serial number JY459V009GC005116, and would like to know the year of manufacture! I know it has an extra tire, but it shares a lot with other projects!
New one is a Yamaha MOTO4, YFM225, think it is an 87 model. My ongoing project is a YTM225DXL, SN 29U077758184, thought to be an 84, which I have fought with over three months, trying to get the idle stabilized. It idles good, but after 10+ seconds, it spits, or backfires, or ? often with a mechanical sound, usually dying instantly. Restarts immediately, first time over, settles down, then repeats. If one tries to ride it more than 25 yds, it may take a brief throttle excursion/wheelie, etc. Have felt it was a too rich situation, tried to lean it out, failed. I have an almost new carb to try, hopefully, as the throttle slide is a much tighter fit; old one seems worn out in comparison. Any hints, or directions to solution appreciated.
I finally found the chart I was seeking, and after further examination, letters 10 & 11 are G C resp. So it appears the sellers guess of 87, is in error. Could have been purchased in 87, but manufactured in 86.
Still need any hints, or directions to solving the carb issue!
Thanks in advance,
John in Texas