expansion chamber info

keith alan williams /

Hi-I just joined and being unemployed I am looking for projects to keep my mind busy without spending money. I had to quit building a Lotus 7 from scratch and turn to something free so here I am. I have a 70 cc Chinese 2-stroke in an old Schwinn cruiser with a retrofit front springer on which I mounted a caliper brake. It is a Gru Bee, or China Girl, or Happy Time. I think building a chamber would be a fun project. I did a bunch back in the 70's as well as half-mile and scrambles steel shoes. I need the dimensions for one if anybody has them, as well as head pipe and stinger length/diam. Also, I could use port window mods, etc for that particular engine. If I knew a for-sure name for it I would search your archives in case someone has already posted what I need. Please be patient with me on that score. Directions rather than flack is what I would prefer.


Keith Williams

Re: expansion chamber info

BootyClap Ninja /

As much as most of us would like to help you, this website is dedicated mostly to vintage mopeds produced in the 70's and early 80's.

We don't deal with chinese 2 stroke junk here unfortuntaly.

Although there are a few other internet forums I have found that would maybe interest you.


Re: expansion chamber info

kieth is obviously trying to distract himself from freaking depression & somebody takes their moped too seriously

I do agree with andy on the website for the question

there is allot more info there on pipes & some freeware as well as some cheap software for calculating the angles & lengths

be nice andy :-)

have a great weekend all


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