Yamaha WR450F 2018 from factory has throttle limiter, intake restrictor and muffler amologated for public roads
Limiter and restrictor are already removed, and the muffler will be changed to competition one
The reversed Yamaha engine provides better mass centralization but needs longer exhaust pipe
The best solution would be full FMF titanium exhaust system which is also sold as original Yamaha GYTR
This system has megabomb pipe which increases low rpm power and reduces noise.
Titanium muffler 4.1 RCT with carbon cap is optimized for minimal weight, size and resistance.
The system weights 2.7 kg
First remove the seat and side rear fairing
The muffler is mounted with the clamp and two bolts
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Remove cover, loosen the clamp and unscrew three nuts to remove pipes
OEM gasket should be remained
Remove the starter bracket to make room for front pipe
In this case radiator bracers are in the way, so I have loosen the mounting bolts
OEM exhaust system weights about 2kg more than FMF one
Installation Starts with megabomb pipe
The shape of reservoirs simulates long header to increase torque, but has low resistance as short header for over-rev
Install starter bracket now, while the pipe is movable
Fit the rear pipe
Use exhaust high temperature sealant for pipe connection
Fit front mounting bolt and tighten cylinder nuts evenly
The pipe should be movable to provide tight fit to the cylinder
After tighten front mounting bolt and install OEM heat shield with the spring
Use exhaust sealant for muffler connection
FMF exhaust system is more lightweight and more compact than OEM one
The muffler is shorter and less susceptible to crash damage
The pipe is closer to the engine and provides better mass centralization
Frame mounting bolt should be used from FMF kit
The RCT 4.1 muffler has Resonance Chamber Technology which reduces noise, resistance and extends filler lifetime.
The kit includes removables part arrestor with stop clip
Heat shield and upper mounting bolt are remained OEM
FMF exhaust does not need remapping but it's better to do it for higher efficiency
European 2018 models have programable ECU in stock which connects to OEM Yamaha Power Tuner
Power tuner is plugged in to connector from left side of steering stem
It shows data from temperature and pressure sensors, RPM and throttle angle
Also, you can check mileage in hours
First set and save custom map into one of the templates. I choose ninth.
I'm going to use Hybrid Map which provides smooth torque at low RPM and strong power at high RPW
Which is good both for enduro and motocross races
Next upload this map to motorcycle ECU
If it's failed - turn on the ignition and try one more time
If it works - you'll see the confirmation
After disconnecting Power Tunes wishes you a good ride
At the end install useful moose racing seat strap to move and lift the bike conveniently
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