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Honda MX & Off-Road Dirt Bikes
What size jets on an XR400 w/ hi-flow setup?
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[QUOTE="snaggleXR4, post: 243556, member: 24395"] Hey, NO, do NOT even think of using needle nose pliers! Jets use a standard metric hex, I don't recall which, maybe 6mm or something. 1) Remove the seat and side covers, and gas tank. Unbolt the exhaust from the rear subframe, 2 spots, unbolt subframe from the frame (down by foot pegs), Loosen airboot from carb intake and then just rotate the rear subframe up to point to the sky. Pull out your airbox while you are at it and give it a good scrub down, in and out, in the airboot, and clean your filter. You may want to support your exhaust pipe so it doesn't hang there and damage your header. 2) Now, remove the throttle cables and loosen the carb from the intake manifold. Pull the carb out the rear, to the right of the shock. Cover that intake manifold so nothing gets into the engine with the carb removed, but don't forget to uncover it when reinstalling the carb! 3) Watch out gas will spill out the carb! Flip the carb over, remove 4 phillips screws and the bowl comes right off. Watch how the plastic baffle thingy inside goes, then pull it out, if it didn't already fall off. Do not mess with the float, it doesn't need to come out. But you can check the float level if your Clymer manual shows you how. Now, you will see long brass hex thingys sticking up, one in the middle(main jet) and one up front(pilot jet). Unscrew them. Use carb cleaner and spray all over, in the holes, clean out any junk in the bowl of the carb. Now install the new jets, tighten them up until they LIGHTLY seat, do not over torque them, put the plastic baffle thingy back in on the main jet, and reinstall the bowl. 4) Now, reinstall the carb and throttle cables, and put everything back together. Route all your carb drain lines, don't forget to put the gas line back on when you put on the tank, and triple check a good fit on the intake manifold and airboot to the carb, you don't want any air leaks. Also, triple check your thottle operation. Make sure there is a bit of free play, and that the throttle snaps back closed, turn your wheel from side to side extremes to make sure there is no binding in the cables. You will need metric sockets, metric allen wrenches, phillips screwdriver, carb cleaner, pliers (for your gas line ONLY), and alot of patience. You really should get a torque wrench also, but you can get away without it. Keep all your screws and hardware in little groups so you know what goes where, and clean everything. Don't be scared, it's not that difficult. Just be very patient and careful and pay attention. Good luck, ask questions if you don't understand. [/QUOTE]
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Honda MX & Off-Road Dirt Bikes
What size jets on an XR400 w/ hi-flow setup?
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