errr... less lift and duration than prior WRs ? Ditto compared to YZs as well ! They call that DETUNING. See my cam selection table !
So they decreased the lift in 2007 why ? The YZ, which runs the same aftermarket exhaust systems as the WR must have the wrong cams then because they retained the high lift. The WR exhaust cam lost duration as well. You need to go tell Yamaha !
My bike forgot to read that bible. I'll slap it around and tell it to smarten up. Or maybe the FI is pretty smart already ??? Hmmm.... 50 hours since I changed the exhaust, no hole in piston, no backfire, runs great, great power, great throttle response.... stupid bike ! I need a carburetor. NOT !
I done with all this.
First off its called Tuning. Cams, Heads, Bore and Stroke, Porting, Piston, Exhaust tuning, Fuel and Air Delivery and Timing.
What, your just going to go up the compression kick up the lift and duration as high as you can to go. Would that work for all situations? Of course not. Yamaha Has setup the WR to run in an all around off road condition. Yamaha change the heads the cams and the fuel system. Yet it is one of the best WR's made. The old WRs uncorked compared to the new WR's uncorked is night and day. So did Yamaha do the right thing with the WR. I think so.
Cams are a part of the tuning and that's just the way it is. Where the YZ was designed to be a hard hitting MX track bike. A bike that is rode just off the rev limiter all the time. The WR was not built to be rode like this. They have the YZ for that.
The WR was build from the factory to need the comp ECU and all the restrictions removed. That how they come in other places in the world.
The stock USA ECU cost $399 were the Comp ECU is less than $100. They want you to have it.
This is were you come in with your stock map. Yamaha made the Comp ECU's stock base map so that if you unplugged the muffler that the bike would run well.
But Yamaha also knew that even with this setup and the new FI that you could adjust the map for different riding conditions. So they give you a list of other maps to use with the programer.
Which change the bikes behavior in so many ways.
You would not know this because you have not tried it WHY?
OH I know its because when you rip out all of you electrical to save weight you loss the ability to flash the ECU on the bike. I know this as I tried to help you back then.
I'm 100% sure that the cam made the bike just the way you wanted it to be. Its just to bad you never got to see or will see the way a map changes the bike.
Edited by vlxjim, September 16, 2014 - 03:05 PM.