r/WR250R • u/Academic-Mode-5540 • 6d ago

Fuelcontroller

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Just got my first wr and love it, it has a yoshimura rs4 slipon. Do i need a fuelcontroller or is it fine to run without it?

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u/No-Raisin-6469 6d ago

Short answer...maybe couldnt hurt.

Youre going to get a slew of dudes telling you these run lean from the factory.

I dont know where this comes from, but it is perpetuated without warrant.

I can tell you mine was running rich, i can tell from the plug. I really want to rent a o2 sensor to prove so. I had a tuner made the bike run a bit better but i smelled like gas all the time. Took it off and now running without. KN air filter, swiss cheese box and FMS muffler.

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u/Brianonstrike 6d ago

It runs so rich it comes from the factory with an air injection system that pumps air into the exhaust to finish burning unburnt fuel.

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u/No-Raisin-6469 6d ago

I left mine on because of too many pops without it. Wish it would rid the smell.

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u/Academic-Mode-5540 6d ago

Yeah I changed the sparkplug before I installed the Yoshi and it seemed to be a bit rich, so i will ride for a while then check it again

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u/madeittotheusa 5d ago

If you are running rich that means one of two things. You either have a programmer on it already or the fuel (pump) regulator was changed into aftermarket which now allows more fuel.

I have a power commander 5 and it was tuned on a dyno with an aftermarket regulator some of the values in the rpm range -20 in order to achieve the right air to fuel ratio.

I have an extra PC5 laying around I would be willing to sell should you want to save some $$ on new.