Dear ATVC: I have 2012 Yamaha YFZ450 with carb. The quad ran fine and all the sudden started dying whenever I would stop. Now it only starts full choke, and dies when I unchoke it. It also dies when I hit the gas any bit. Please help with the problem. Jlbisme The famous catch-22 when […] More »

Dear ATVC: Picked up a Honda carburetor off eBay. Inside is beautiful but the outside is completely oxidized. Before I mount I was wondering what’s the best method of cleaning it up. I fear if I ever need to adjust the external screws, there won’t be much left in this condition. Mr.Steele We typically view […] More »

Dear ATVC: I’m fairly new to ATVs and picked up a used 1987 Honda TRX250R (2-stroke). The jetting needed a little work and that got me wondering why none of the manufacturers offered a fuel injected 2-stroke. That would forever solve jetting worries and probably create less pollution in the process. Or is injecting a […] More »

Dear ATVC: My quad had been sitting a few years and when I opened up the float bowl to clean out the carb, the inner walls were coated in green crust What is this and how do I get rid of it? Green is the telltale sign of corroded cast aluminum. Contrary to common misconception […] More »

Dear ATVC: I’m building up my son’s Honda TRX90 with the following engine mods: Ported head, TBQ Race cam from Beatrice cycle and a 114cc cylinder kit With Flat top piston, stepped header pipe to stock muffler. Here’s the question; Do I run the stock carb and jet it up (I think it comes stock […] More »

There are certainly some advantages in the real world- namely saving you from having to make carburetor adjustments to compensate for things like elevation, temperature, humidity and modest modifications. Additionally throttle response across the entire RPM range is typically improved and fuel injectors are less susceptible to fuel varnishing that takes place during long periods of inactivity/ storage.

Dear ATVC: I have a 1987 Suzuki Quadracer 250 that pings every time I crack the throttle. It has a fresh top end but is still stock spec. The only other mods are a pipe and vented airbox lid. Any ideas? Pinging is actually the result of pre-ignition of the fuel in your engine’s top […] More »