Difference between yamaha yt125j and yt125k?

[Ivan]

Hi there I've got an 82 yamaha yt125. I'm looking at original repair manuals on eBay and saw there were two different versions available. The yt125k and yt125j. Does anyone know what the difference in these two models would be? Any input would be appreciated thanks!

[emmie357]

Yamaha liked to use different letters for each year, I don't know much about the YT125's so I'm not sure if those two are the same or if major changes were made (someone will probably pop in who does).

[Vealmonkey]

The only difference would mainly be the model year. The biggest differences in the yt125, would be 80 and 81 had several differences, mainly in the shifter parts, and the rear bearing carriers were different than the 82 and later models. The 82 and later yt125s, were pretty much all the same bits as the yt175 except for single fuel tank instead of 2 tanks, top end of course, fuel pump on the yt175 and the exhaust pipe. There may have been a couple more little differences, but, I can't think of them off hand. I don't remember which letters denote which year either. The 82 and later yt125s seem way more desirable than the 80 and 81 yt125 to me. I had a 1980 yt125 that I had put a Pro Tec bolt on rear suspension kit on. The frame had to be a little more modded than an 82 and later yt125, which was a super easy bolt on. Still was a fun wheelie machine though.

[Ivan]

Right on thanks for the input! Ya I couldn't really notice any major differences. It's neat all the things you can still buy for These trikes, mines almost like new again. And they are not worth anything really which I find to be the fun part. Everything I put into the yt125 equals 2 payments on my yfz450 haha

[sanchez]

My TF motocross bike is a yt125 payed 100$ for it putting the aftermarket exhaust on like50$
When i finally get the ports cut i might be able to place first agains worked 110's
Although they over heat easily nothing but the175 wheelied better

[85 atc 250r]

82 and 83 yt175 use different clutch baskets. 1982(5v7) yt175 uses a 5v6(1982 yt125) clutch basket. the 1983(20E) yt175 uses a 4mm taller clutch basket.