I am wondering what you mean by a K&N intake? If you mean a K&N filter, they don't always breathe as well as the OE filter and it is important not to lose the cold boxing of the original setup. I am wondering if the performance exhaust included a higher flow CAT and an extractor manifold.
If those two mods are the only changes you have made and assuming the K&N is breathing better and is properly coldboxed, etc. then clearly it is likely the engine with the original valve timing is unhappy without some air resistance at the intake/exhaust back pressure - such things often play an important role in the overall tune/performance of the engine.
My initial instinct is to suggest you take it to a specialist and have the engine management remapped.
SOURCE: No power and high fuel consumption
Suspect worn needle valve & seat assembly !---Quick test , with care>Whilst riding on open road &holding throttle at set position, switch off fuel supply & note IF engine speeds up, IMMEDIATELY Back off throttle, watch rear vision mirrors for traffic behind & switch on fuel supply!---If that small test indicates Carburettor area of further examination, UNLESS YOU ARE QUALIFIED the needle valves need to be examined byTrained eye!-(Especially wear on sides of needle valve & ALSO, check "floats"Stay Upright Des
SOURCE: 5th. Gear
Sounds like you may have bent a shift fork or your cluster gear has some missing teeth on it now. I would venture to say that is it a bent shift fork. This will require the transmission be removed to gain access to inspect and repair.
SOURCE: NO 5TH GEAR IN MY 1995 MITS 3000,NO NOISE,NO PROBLEMS SHIFTING
I have the same problem. on the passenger side under the fender you will have access to the transmission. Remove the cap on the end. You will need to drain the transmission fluid and replace all the gears in the end cap if damaged hopefully they are not and you can just tighten up the nut. What happens is a nut comes loose and backs off the pressure on the bearings and you loose 5th. I removed the entire transmission and opened it up. There is nothing wrong with the other gears, because your problem is with the 5th gear synchronizer assembly. I let mine go too long and I'm having to replace everything. Make sure you put the appropriate torque on the nut and hit it with a hammer to lock it down. This should really be designed with a different method of keeping that nut in place. It's costing me lots of time and now money at the stealership. Good LUCK.
SOURCE: I have a 2008 kfx 450r and the cooling fan will
mine had the same problem,,, just pop out the hood,,and you will find two orange boxes,,,one is for the cooling fan i dont remember wich one is,,,and inside the box ,you will find,two fuses (one is the spear)and just replace ,,the blow fuse for the spear one,,,,,(sorry bad english) ,,,
SOURCE: 1998 GMC Sierra 2500 5.7L
starting definately has a lot to do with the crank/cam position sensors, but it wouldnt have nothing to do with hot or cold weather, oxygen sensor will make the vehicle run too rich if its out, you will smell fuel very strong out the exhaust, that could make it run sluggish also, and usually if the mass air flow sensor goes out the vehicle wont start at all...
here is one or you can go to kfx450hq.com good luck with your project.
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