2003 Yamaha WR 250 F "testing intake manifold leaks" Questions

own is usually a sign of an air leak. Commonly at the crank case, reeds (reed block), Intake manifold (rubber split), magento side crank seal, CARB CAP.... If no obvious leak, have it leak down tested

...manifold. You may just have an intake leak. Shine a flashlight between your jugs and see if their is black sooth around your manifold where it joins the jugs. The guy above doesnt have a clue. It ...

...intake manifold. You could have a bad spark plug. You could have a valve adjusted too tightly. You could have low compression. The list is long. When is the last time you adjusted your valves? The ...

...intake manifold. There is a vacuum hose that connects on the backside of the carb. It goes to the VOES switch. Make sure this hose is on and in good condition. If that's good, you may have a ...

...intake and clamps to find the leaks. Once the leaks have been stopped, work on the carb. If you're using the original Keihen carb, you'll probably find that the slow speed jet or the idle port is ...