I typed this up as a reply to a thread on another, non Raptor Forum forum ...
The running-mods-without-an-aftermarket-fuel-controller-discussion is the great debate when it comes to the Raptor 700. I have an opinion on it but rather than just posting information that could potentially harm someone's quad I decided to contact Yamaha Sport Customer Relations and ask them. Attached is a transcript I typed while I was on the phone:
Me: "Is an aftermarket fuel controller required to prevent a lean air/fuel condition on a Raptor 700 that is stock other than a GYT-R slip on muffler?
Yamaha customer relations tech: "Using an aftermarket fuel controller is not recommended."
Q: "Why is it not recommended?"
A: "Yamaha does not recommend using aftermarket parts on Yamaha products."
Q: "OK. Yamaha does not recommend using aftermarket parts. Will adding a GYT-R slip on muffler create a lean air/fuel mixture requiring me to figure out a way to compensate for it using Yamaha parts?
A: "The factory fuel controller will be able to handle it."
Q: "I've read that dealerships can perform some sort of flash reprogramming to the fuel controller that will adjust the lean air/fuel condition created by adding GYT-R mods. Why would that be necessary if the factory fuel controller is able to handle factory modifications?
A: "I've never heard of authorized flash reprogramming of fuel controllers."
So there you go. My take on it: If you stick with GYT-R parts you do not need a different fuel controller. GYT-R (Yamaha) sells all sorts of mods that can change the air/fuel ratios (intake, various air filters, pipes, slip ons, quiet tips, etc.). It does not sell a different fuel controller. There is a reason for that.
The running-mods-without-an-aftermarket-fuel-controller-discussion is the great debate when it comes to the Raptor 700. I have an opinion on it but rather than just posting information that could potentially harm someone's quad I decided to contact Yamaha Sport Customer Relations and ask them. Attached is a transcript I typed while I was on the phone:
Me: "Is an aftermarket fuel controller required to prevent a lean air/fuel condition on a Raptor 700 that is stock other than a GYT-R slip on muffler?
Yamaha customer relations tech: "Using an aftermarket fuel controller is not recommended."
Q: "Why is it not recommended?"
A: "Yamaha does not recommend using aftermarket parts on Yamaha products."
Q: "OK. Yamaha does not recommend using aftermarket parts. Will adding a GYT-R slip on muffler create a lean air/fuel mixture requiring me to figure out a way to compensate for it using Yamaha parts?
A: "The factory fuel controller will be able to handle it."
Q: "I've read that dealerships can perform some sort of flash reprogramming to the fuel controller that will adjust the lean air/fuel condition created by adding GYT-R mods. Why would that be necessary if the factory fuel controller is able to handle factory modifications?
A: "I've never heard of authorized flash reprogramming of fuel controllers."
So there you go. My take on it: If you stick with GYT-R parts you do not need a different fuel controller. GYT-R (Yamaha) sells all sorts of mods that can change the air/fuel ratios (intake, various air filters, pipes, slip ons, quiet tips, etc.). It does not sell a different fuel controller. There is a reason for that.