So.....in the past 4 years, I've trolled this magnificent website regularly, and have applied the knowledge to everything from Buells to watercraft, harleys, hondas, scooters and more!
That said, thanks for reading my first post!!
2001 WR 426. Particular bike is new to me, however the breed is not. I've had my YZ 426 for 6 years. took about 3 years to find the right WR for the right price. In the process of getting it plated now, so its intent is a street machine.
I don't see, or have missed, custom exhausts. Mufflers in particular. I say this because I cant help but notice upon inspection, or repacking mufflers, how much they resemble a glass pack muffler. No not JUST because its actually packed with glass "fiber", but in its design as well.
I also can't help but notice that the silencer insert, or spark stopper thingy, looks/acts alot like a "baffle" you might find stuffed in the tail pipe of harley that someone tried to quiet down with out dropping 600 bucks for new exhaust.
Glass packs are dirt cheap, come in numerous lenghts, with a decent choice for inlet/outlet diameters. And typically have an overall diameter of 3-3 1/2 inches. Oh and they're packed with glass fiber!
The inserts can be had in diameters to match the glass pack outlet, and are held in via set screw, trust me, it holds. The key to the insert is that they come in various lengths as well, and can very easily be cut! So now we have the ability to tune the muffler.
I've done just this on an old harley shovelhead bobber, ran great, trimming the baffle seemed to do more for sound then anything. I got better results from changing the distance of the glass pack in relation to the exhaust valve. But the point is it worked. That motor was a 1200 CC motor that rarely made it to 5000 RPM.
Anyone see an issue with running something like this on the smaller, higher revving motor in my WR? It seems to be the same concept as a factory muffler, just in a different package, so to say.