Post by
VStar650CL »
https://forums.nicoclub.com/vstar650cl-u299034.html
Sun Dec 10, 2023 8:18 am
It all depends on the transmission and how well the owner treated it. The QR25 engine is as bulletproof as any 4-banger ever built, but the CVT trannies can be big trouble if they've been neglected. If you can find a pristine '04~'06 gen3, that's not an issue, they have a 4-speed A/T which is pretty ironclad. I'd stay away from the '07~'09 gen4's, those were the first years for the CVT. They didn't have proper cooling and were very problematic. The '10~'12's still had the '10A transmission but had a heat exchanger and were a lot better than the earlier ones. From '13 up they all have various implementations of the '10D and for the most part get better with time. The exceptions are the '16's and early '17's, those had some serious Valve Body issues.
I'd suggest downloading a copy of the CVTz50 app and getting yourself a compatible ELM327 dongle (the VeePeak VP11 is the best-cheapest one). That will let you pick the brain of the transmission controller (TCM). If it has any P07xx, P08xx, or particularly P17Fx codes in it, pass and go to the next car. Also go to "CVT Information" and look at the parameters CVT-A and CVT-B. If either one is non-zero, pass on it. Even if the TCM is clean, be prepared to do an immediate fluid change when you buy it and change the fluid every 30K miles thereafter. CVT's are not like regular automatics, fluid is life.