Stihi Carb

FrankyLynn

New Member
Feb 10, 2020
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Hi, Cannonball 2. Sorry to be so late coming to the party, but I just joined yesterday. I was searching the 'net to find ''the best carburetor for 66cc 2-stroke engines", and found your post. I like what you say about using the Stihl carburetor. I plan to get a couple from Amazon, based on your recommendation. I was also excited to see that you are using a 3 speed Sturmey Archer IGH as a transmission. I have one on a Schwinn that I bought from Walmart about 11 years ago, and am planning to use it as a transmission on a highly modified shopping cart I am building. I wasn't aware of the "fixie" being able to be left side driven. Neat! But I plan to use what I have, so a jack shaft is the way I will go. I would like to ask how you "hollowed-out" the 'geared' sprocket to get it to fit evenly over the body of the hub so that it can snuggle up against the spoke flange?

I like the way you think. Thanks ahead of time for your help. FrankyLynn
 

cannonball2

Well-Known Member
Oct 28, 2010
3,662
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Colonial Coast USA.
Search Cannonballs abbynormal 3speed build. All the info is there. As I remember the sprocket on the hub itself is from a 7sp SA hub just fit with a bit of drilling. The hub on the 7sp was much larger and turned out being just right to fit the 3sp got lucky!
 

FrankyLynn

New Member
Feb 10, 2020
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Thanks for the tip. It just occurred to me that a chain ring from a 21 speed derailleur might be a good way to go. Easier to find. Have a good one!
 

KCRickSS

New Member
Jan 21, 2017
3
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USA
Thanks for sharing! You inspired me to copy your design pretty closely and it is working well after the first day.

I love the quick tuning, I just need to figure out my mid range bog and it will scream. But the top end is pretty great so I think it is close.

I will never install anything else after doing this setup!

Thanks!
 

KCRickSS

New Member
Jan 21, 2017
3
0
1
USA
FWIW, I discovered my bogging was from running without the lid on my "airbox", which just happens to be an ancient tin of pellets I had sitting around. :)

Running like a champ today!