KTM silencer on YZ/WR?

NVR FNSH

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#1
I think I read a post somewhere on DRN about using a 400/520 EXC silencer on a YZ/WR to get a quiet yet non-choked down exhaust system. Can anybody point me to that thread? I can't find it....


Brian

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'99 WR400 - dual sport
'90 KX500
'92 XR250R - dual sport, wife's bike (I ride it more than she does because it goes ANYWHERE)
 
- a d v e r t i s e m e n t -

MWEISSEN

Whaasssup?
Mi. Trail Riders
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#2
Yeah, I'd like to hear about this. If anyone has a KTM 400 exhaust they'd like to part with, let me know at mweissen@chartermi.net. THIS is the way that Yamaha has to go on its next line of YZ's and WR's. I love the sound of their 4 strokes, but there's certainly a lot of peole out there that don't. We've got to be responsible to protect the riding areas we've got!



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Mark
'01 YZ250F,'01 Yzinger 80,'99 WR400F,'99 XR100
'98 Royal Star TC,'96 XR200
 
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#3
check out http://www.peterrenner.net/exc

be patient while downloading and please ignore the mess seen in the background

(btw. i was too busy lately to cut off the
remaining unused EXC tab and to finish up
the load bearing one)

I had an 520 EXC muffler welded onto an Arrows pipe.
The pipe fits more or less nicely onto the stock header.

At first i tried to use a spring like attachment like KTM, but this proved too loose, as the WR offeres only one point to support the muffler, whereas the KTM has two.

Effect:
up to mid rpms very stealth, no problems pull ing up to the traffic light near the cops at 2 AM. Beyond mid rpms the sound turns more into an XR600-w/out-baffle style, only less noisy.

Biggest plus:
Better throttle response down low.

Biggest drawback:
Muffler need repacking

cost (incl. 20% Austrian sales tax!):
$240 EXC muffler
$100 Arrows stainless steel mid section
$50 welding

not counting the DIY sawing and rivetting


HTH
Rowdy

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Rowdy, WRZ400EXCbrc '98