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View Full Version : off topic kinda - exhaust mods


tokarev
12-10-2007, 09:39 AM
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
12-10-2007, 09:59 PM
looks good. :o obviously it must be 2 -cycle.

Mike38
12-10-2007, 10:19 PM
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
12-11-2007, 03:11 AM
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
12-11-2007, 10:45 AM
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
12-11-2007, 04:39 PM
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.