I have a small problem with my carburettor. I bought a 2000 te610 recently. It has been converted to supermoto with a tuned engine. The engine has been bored to 600 with increased cr, changed cam and valves, guides and stage 3 gas flow. Anyway, all was going well with the recommissioning. Had the carb off and cleaned everything as it was completely bunged up. Put it all back together and turned on the fuel, which poured out of the overflows. Took the float chamber off and tested the floats in some meths, they float (though meths is more viscous than petrol). Checked that the needle would stop fuel by pressing gently against the arms. Checked the arms were parellel with the carb body, which they were. Adjusted the arms so that the floats should cut off fuel early. Put the bowl back on. Same result, petrol pouring out of the overflows. So, my question to those who have been down this road, should I change the needle, the two floats, both, or something else? Thanks Sean
I'm guessing you have the Dellorto PHM 40 carb? I had the same problem on my '93 WXC 610, and it turned out to be the float needle was not able to close when the floats pressed against the plunger. For some reason the plunger ( top piece on the float needle on left) would fall too far down in the needle housing and cause the plunger shaft to no longer be concentric with the hole that it should slide in. When this happened the float arm would push it into the float needle body at a slight angle which caused it to stick open, and flood the carb. I gave the float needle plunger a good cleaning, and just slightly bent the portion of the float arm that makes contact with the plunger in a way to prevent it from falling out of concentricity with the body. In my case I verified that the plunger was the issue by removing the carb bowl and pressing the float arms up as high as they would in normal operation. I was able to see that the plunger was "falling out" of the float needle body, and when I released the float arms the plunger prevented the arms from falling down again by their own weight. Might not be the exact cause of your issue, but this is just my 2 cents. Hope it helps.
