Near the end of a ride yesterday I began experiencing problems with the bike stuttering. Luckily I had just made it out of the Jungle and onto some tarmac where the bike completely died. It then began to rain heavily (sods law) but I managed to push it a few hundred meters where I found some cover. Let the bike cool for a minute or two and then tried firing her up again. She barked into life instantly and off I went again. Another kilometer down the road and it died again. Now I was in the middle of nowhere and had to push it for a further 2 k/m. (luckily some downhill). I initially thought there might be water in the Carb/Fuel Tank from the jet wash the previous day. I removed the Float Bowl drain plug from under the carb, refitted it and let it fill up. I didn't notice any water from the drained fuel. The biked fired up first time and didn't have any further issues til i stopped. I then noticed the Carb overflow hose venting fuel. This indicated that the Float Needle must be sticking open and closed randomly. This morning I proceeded to remove the Carb. The Aluminum framed WR's are not as straight forward as the old Steel frame models as you have to move the sub-frame and shock to get at the carb. Now I didn't have to inspect too far to find what I had suspected, Gasahol Gunk! This is the inlet side of the Carb. You can clearly see the red gunk at the bottom of the slide. The particles you see is from the dirt on removal. And the engine side. You can see the gunk build up on the mating face. Inside the slider chamber. Again gunk, noticeably around where the seal is. Forgot to take a photo but the float chamber was the same. The needle valve wasn't as bad as I thought but it wasn't what it should have been either. So thoroughly cleaned the Carb with appropriate cleanser. Here's some photos after its cleaned. Im off working for 4-5 weeks so ill not bother fitting it until I get back. Im pretty confident this issues is a result of Gasohol residue. It does seem to be reacting with all rubber/plastic components which produces the residue resulting in moving parts sticking or jets blocking up. Yamaha indicates that Gasohol can be used with my bike so why is the Thai Gasohol reacting with components!!!???!!! I was able to completely strip the Carb down using just this Leatherman.