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Old 08-22-2010, 06:21 PM   #53
niggles
Adventurer
 
Joined: May 2010
Location: BEND. OREGON.
Oddometer: 49
niggles

I made these, they have cone spark arresters on the inside very simple to make start with a small exit pipe 90 degree turn down would make less noise, then drill small holes to get the right balance of noise and flow.I did not re jet ,but I like to run my bikes a bit rich,the rear of the 690RR is a little weak my came with a metal support you can see it in photos.I also went two larger on my rear sprocket as my bike had 100mph+ the lower gearing made it much easier to ride tricky sections of trail.
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