Performance gains means tweaking the carb. Dear ATVC: I have a 2004 Honda 400EX and I’m getting a RS3 Yoshimura full system from someone that used it on a 400ex before me and I am not sure how to figure out what jetting I need for it to run good. I would really like to […] More »

Probably not the problem. Dear ATVC: I just picked up a 2002 Suzuki LT80 for my son. I have noticed the carb choke plunger only moves about 2mm up and down when pulled or pushed. It seems that the plunger should move more like an inch but I haven’t been able to find an answer […] More »

Fuel system failure. Dear ATVC: I rode my Bombardier DS 650x today and it kept dying from lack of fuel to the filter. It seems it’s not getting fuel despite a full tank of gas. I opened the gas cap and heard the pressure release from the tank. I have no idea what it could […] More »

Dear ATVC: My 09 Yamaha Kodiak 450 spits and sputters and has no power when I try to accelerate in forward and reverse. It sounds like it is flooded or not getting enough fuel. I Took the fuel tank off cleaned out the fuel tank clean and the fuel pump filter, cleaned the carburetor, replaced […] More »

What carb did I get? Dear ATVC: How can I determine if my carb is from a 300EX or a 400EX? I ask because I just got a 400EX and the main jet is only 127. Stock on the 300EX is 122 so I was wondering if this means someone installed a 300EX carb on […] More »

Dear ATVC: Did some trading and ended up with a 1995 Suzuki LT250 Quadrunner 4×4. I went through the carb, cleaned it and threw in a new battery. When I fired it up, I noticed the air box filling up with gas/oil mixed and discovered it was coming from crank case through the vent tube […] More »

The mysterious stack. Dear ATVC: I’m looking at a carburated Z400 that the ad states is equipped with velocity stacks. What is that and what does it do? That’s a solid question. You don’t hear a whole lot about them these days and it gets even more confusing because they are often called things like […] More »