off topic kinda - exhaust mods

[tokarev]

Last night we modified my sons pocket bike pipe - had to reshape radius around the head - split the expansion chamber and moved the front cone foward. Added 2 1/2 inches to the center. This goes along with a bunch of other engine mods he did. Hope it works OK - the engine that is. He wants to ride it this weekend in a Christmas parade.
http://i108.photobucket.com/albums/n34/tokarevsvt_2006/Pocketbikeexhaustmod.jpg

[warrior91]

looks good. :o obviously it must be 2 -cycle.

[Mike38]

Is there a reason why you did this? If you change the dimensions of a two stroke exhaust pipe, it can drastically change the engine performance. Four stoke exhaust is relatively fool proof, but there is a science to two stoke exhaust.

[czowner]

If you change the dimensions of a two stroke exhaust pipe, it can drastically change the engine performance.

I totally agree, but extending the front cone usually improves mid-range.

Jonathan.

[tokarev]

Mid Range is what hes looking for - My son researched the pipe mods - I made it happen (cutting/welding) Hes made a bunch of other mods to the engine in addition to the pipe. Started the engine last night - test ride this afternoon - YeeeHaa

[tokarev]

Well I rode it today - all 240 lbs - worked fine
My son is 60 lbs lighter
http://i108.photobucket.com/albums/n34/tokarevsvt_2006/pocketbike.jpg

Besides that it has a lightend flywheel, slightly tapered carb, triple stage black widow reeds, better air filter, DDM headkit w/ 2 boost ports, NGK spark plug wire/boot, homemade boost bottle, and third gear support.