Yamaha 450 yfz TPS AND JETTING

[Jay Nel]

I have 450 yfz 2005 with less then 1 hour on it. After riding it for the first time I was so disappointed on it's low end and overall performance. After asking around I heard that exhaust and rejetting makes a world of difference.

So this is what I did.

BUB Moto C4 Carbon Fiber/Titanium System

K&N Proflow w/o lid

175 Main jet

NCVQ on 7th position

Stock pilot 4 turns

About 825ft above sea level

It still lack in the low end and runs a little rough. Any suggestions?

Also while doing all this I unhook my tps (throttle position sensor), and now I'm not sure if I hook it up right? HELP ME PLEASE!!!

[dems450yfz]

i think you have jetting set to high position set high also

[Ford350R]

Sounds like your main is about right for that altitude, I am at 7K Ft and run a 155 main. I had the NCVQ needle but it doesn't seem to work as well up here. With the needle at 4 turns out your pilot is lean, to make adjustments easier get an aftermarket TY needle then up your pilot one to two sizes. I went with a Dr D exhaust and -6 TT flywheel I run mainly in the woods and trails of Co. I have never had a problem stalling it they tons of bottom end torque when jetted correctly. Also do the CAM mod that will increase the power all around

[125shifter]

Where did you unhook the TPS? At the thumb throttle or carb? The system takes these (2) points as inputs.

[Jay Nel]

at the carb