I bought this carb for my XR600R from a Tuning Company named Bergos in Germany, it made the 600 run like a wild horse on chilly. I sold my XR600 some time ago, but took of the carb, because I intended to use it in another project bike. This never happened and it has been sitting around for a couple of month now and I will let it go for 6500.--THB, that's half the price from what I paid and there's absolutely nothing wrong with this carb. Turned my bike into a one kick affair. This carb is jetted for XR600R or XR650R there's an aluminium spigot to the airbox side that make fitting easy and uncomplicated. A great upgrade for many 600cc bikes