Stock Silencer with welded on "Sparky" is the Hot Ticket. A stocker is pretty darn quiet IF you keep it packed.
The Sparky causes virtually NO power loss.
Manny
I'm resurrecting this old thread from who I believe was one of the former Team Green mechanics. When I first bought my ex-Team Green KX500, it had an FMF pipe and turbine core silencer since the professional rider who owned it was sponsored by them. I also got a brand new turbine core with the bike, so I put it on. Here is the brand new turbine core I put on right after I brought her home (mind you, with an FMF woods pipe that Team Green was testing. It does NOT fall on it's face on high RPMs like many I hear claim):
I ride in the desert a lot, and within three months, the pipe was leaking (mind you, this was a professionally jetted bike, and when I did some throttle chops the jetting seemed spot on) all over my swing arm and rear brake.
So, I repacked the silencer and put some RTV around the o-rings and that sealed it up. However, now it's always a pain in the A$$ to break it apart for service. Not to mention, the tire barely rubs the turbine core, which was never an issue with the oem one.
So, I've mentioned this before, I've always wanted the Team Green silencer I would see on Destry Abbott's 500 as well as Danny Hamel's and a few others. They would take the stock silencer (which mine never leaked with new o-rings, never rubbed, etc), shorten it by about three inches, and welded a Cobra Sparky on the back.
Here is a pic of an old Team Green Bike up close to show how they did it:
You can also see it here on this older picture of Destry's race bike:
And, my new toy I picked up off Ebay for $50. It's barely used, and the welds look great. They did it a little different than the Team Green ones, but the end result is the same. Time to repack it, put in new greased up o-rings, and see what she's all about. I put it next to another spare OEM silencer I had laying around for comparison:
Even picked up an NOS sparky replacement core from Ebay before looking through old parts I have and discovered I have several from all the years my dad and I used them when we raced!