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Discussion in 'Motorized Bicycle General Discussion' started by mapbike, May 27, 2011.
Proly doesen't matter, but I had a similar experience with a mountain bike I built. I did not like the stock exhaust, but my expansion chamber (not a SBP) would not run any better on that motor- ended up getting bored one day and chopped up a stock exhaust with plans to modify it, but just left it shorty straight pipe.
Wow! I got some great low end torque from that lil' motor after the change....
So- Yeah, I had a similar experience. But then again....I have learned to never follow, rather to try to find my own way. Common knowledge is not a book I normally read from.
-Just my experience-
Well Ive run stock and two diffrent expansion chambers and both gave my engines much more bottom end over stock. I tuned the SBP expansion chamber for max bottom end torque and it did give my bike the most hill climbing power over any of the other pipes. Now that said Iam at over 8000 feet so that might change a thing or two lol.
When you put on a expansion pipe, you'll have to change the jet again.
Also, the length of the header pipe will determine whether it will have 'bottom end' power or 'top end'.
I HAVE to rejet up here so I do it after I install a new pipe but how ever you look at it the SBP pipe made the biggest diffrence to my ride of anything Ive done to it other then port matching and cleaning up castings.
Hi! just got my first bike running and i am wanting to make my own exhaust. how did you make that, what kind of pipe and other materials did you use? And I appologize if you have made a post about this. Please give me a link if you have thanks much!
From this very thread http://motorbicycling.com/f3/well-i-just-had-say-see-30229.html#post288642