Expansion chambers & performance pipes for China 2 strokes

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brett7777

brett7777

New Member
Aug 19, 2011
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Auckland, New Zealand
A while back, over in the boardtracker threads, I came across a comment that suggested that changing pipes on China 2 strokes didnt make much difference.
I knew that couldnt be correct, as all my experience with 2 strokes in the past suggested that if you have a correctly tuned pipe then you can coax much more power outta them.
I changed to the simple 'performance' pipe on this page. It made an amazing difference.
Note that he has developed a more involved design on there too. He claims 74 km/h with a 48cc (carbon frame) with that design.
Performance Exhaust Systems Cycle Pro Motors
The pic is a diagram of expansion chamber theory
 

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bharmon

New Member
Nov 3, 2011
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Ohio
Thank you Brett, that was exactly what i was looking for. Did you fab. an expansion chamber exhaust using this guide?

Bruce Harmon
 
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talbotti

New Member
Sep 17, 2011
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Finland
Venice Motor Bikes

Venice Motor Bikes

Custom Builder / Dealer/Los Angeles
Mar 20, 2008
7,271
1,810
113
Los Angeles, CA.
That pipe looks awesome! All 2-stroke pipes are that way; you can tune them for either low, mid, or high RPM power, but you can't have it all... :(

Good job on it!! (^)
 
maniac57

maniac57

Old, Fat, and still faster than you
Oct 8, 2011
4,484
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memphis Tn
I welded a junk pocket bike chamber to my china exhaust flange...No way it was tuned right for the engine but it made a very large difference in power! Now it's one of the first mods I do with a new kit> Cheap and easy(if you have a welder)
 
allen standley

allen standley

Well-Known Member
Oct 22, 2011
1,126
238
63
Bangor, Maine
I used an expansion pipe from a pocket rocket. Tuned properly--probably not.
Immediately noticed better midrange seemed to breathe easier. Looks hotter'n **** and snds like an old McCulloch chainsaw my uncle used in the woods.
 
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Gan Man

New Member
Jan 22, 2012
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South east , Ontario
Hi members, I was wondering if SBP expansion chamber is about the same as one on bike berry &canada skyhawk site ? Prices are slightly different ,which is better ?
 
NunyaBidness

NunyaBidness

Active Member
Jun 29, 2008
1,062
2
38
memphis tn
Gan Man said:
Hi members, I was wondering if SBP expansion chamber is about the same as one on bike berry &canada skyhawk site ? Prices are slightly different ,which is better ?
Click to expand...
I've never used any of them but the guys at SBP are members here and take care of their customers. I've only ever seen people praise them for fast shipping and quality products. I don't think you could do better any where else.
 
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