Calling all G-1 Folks - Carburetors

[mikeasis]

after comparing carbs the J10 carb has a bigger throat than the mokuni but the mokuni looks to be modeled after the J24 which also have a small throat diameter. they are 2 different carbs, both are mikuni but one is a Mikuni BV21-16 the other BV24-18

[cgtech]

Whoa, data! I love when I get new "nuggets of info", thanks. It's really cool to learn new things. (That arent speculative bits)

[mikeasis]

In case anyone is looking for jets

I Found that Mikuni main jet part number for these jets are N102.221 then your main jet size, so I ordered the following.

N102.221-105
N102.221-107.5
N102.221-110

These are Mikuni numbers so you can even find them on ebay. Soon as I get time Ill break the warranty on that new MOKUNI and see what happens.

[Snakeoil]

For those not familiar with carb nomenclature, the low compression J17 carb which I understand was also used on the J24 engine, was identified in an earlier post in this thread as a BV21-16. That means that the carb throat downstream of the venturi measures 21mm or 0.827 inch. The J10 carb also identified in that same post as BV24-18 has a 24mm or 0.944 inch throat. So, if you need a carb for a J10, you could look for any carb with a 0.944 bore or close to that and will accomodate your throttle set-up. Most slide carbs use cable so might be a challenge.

The Chinese Minoki knockoffs are based upon the J17 carb which is roughly 1/8 smaller in throat diameter than the Mikuni J10. I understand from reading here that many are running this smaller carb with good results on J10 engines. I would think that the smaller throat would probably result in much better throttle response. I'm not sure you would notice much loss of top end, but only a comparison between the two carb sizes would be able to show that. Where you might see it is in max power produced. It might run a tad slower with a heavy load, like two heavy passengers.