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Old 05-21-2009, 07:53 PM   #1
tonyt915
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What to measure for a carb replacement?

So I have been messing with getting my Yamaha BW200 restored but when i was cleaning the carb a friend knocked over the cleaner and lost the main jet to the carb. I have searched for almost a year trying to get the part since its discontinued but no luck so I was thinking of just getting a carb from edlebrock or keihn but i dont know how many MM's the oem carb is. Does anyone know what I measure to find out. Am I supposed to get the inside or outside diameter of the carb.
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Old 05-21-2009, 08:27 PM   #2
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Usually you measure the diameter at the inside of the throat (intake manifold side). But some carburetors are measured at the venturi, not at the bell mouth (filter end) or at the manifold end, so it can become a little fuzzy. It's not a precise measurement on some carburetors simply because they have an oval venturi. In these cases it's an average number.

If you buy a whole new carb because you've lost the main jet, you're insane. Carb parts are everywhere for these. Contact Sudco.
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Old 05-21-2009, 08:35 PM   #3
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Quote:
Originally Posted by Racer997 View Post
Usually you measure the diameter at the inside of the throat (intake manifold side). But some carburetors are measured at the venturi, not at the bell mouth (filter end) or at the manifold end, so it can become a little fuzzy. It's not a precise measurement on some carburetors simply because they have an oval venturi. In these cases it's an average number.

If you buy a whole new carb because you've lost the main jet, you're insane. Carb parts are everywhere for these. Contact Sudco.
Is Sudco a member or a place? Thanks for the info on what to measure. Yeah If I can find the main jet I would rather go thst route but its a discontinue part, and the bikes were made from 86-89.with no aftermarket following. I've tried to cross reference see If there was another Yamaha 200 that used the same parts but it seems the parts for the big wheel are model specific.
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Old 05-21-2009, 08:42 PM   #4
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www.sudco.com

Call them and ask about your carb first.

A friend at the track has a BW pit bike and I recall he was telling me that he simply bolted on a plain jane VM for some reason or another. VMs are everywhere, and there's nothing special about the garden variety BW 2-stroke engine that prevents a VM from working.
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Old 05-21-2009, 08:45 PM   #5
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I have the bw 200 its a 4stroke on the 80 was 2 stroke
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Old 05-21-2009, 08:49 PM   #6
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Quote:
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I have the bw 200 its a 4stroke on the 80 was 2 stroke
Same difference.
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Old 05-21-2009, 08:51 PM   #7
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Ok so what's a vm?
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Old 05-21-2009, 08:58 PM   #8
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Quote:
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Ok so what's a vm?
A basic round slide, old-style Mikuni carb. I'm using it as an example of what will likely bolt on and work fine.

http://www.sudco.com/CatalogJPG/117.jpg
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Old 05-21-2009, 09:03 PM   #9
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Ok thanks for the info ill check with sudco
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Old 05-21-2009, 09:13 PM   #10
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Try Bike Bandit if you know what the model is. They have a lot of carb parts.

www.bikebandit.com

Or look on ebay.
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Old 05-21-2009, 09:19 PM   #11
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Tried eBay for a few years buy most parts so I can have replacements, only seen one carb go up for auction and I asked someone to bid on it for me and she didn't get it
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Old 05-22-2009, 06:15 AM   #12
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Tony,
Look at

MrCycles.com as well. I know for the 96 ninja they had allot of original parts for my bike
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Old 05-22-2009, 08:59 AM   #13
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If it's just the main jet I probably have it in stock.
I keep both the Mikuni big and little head jets, as well as the Keihin round and hex jets.
If not I know I can get it in a day or two, bring the carb with you when you come.
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Old 05-22-2009, 10:17 AM   #14
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Quote:
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Tony,
Look at

MrCycles.com as well. I know for the 96 ninja they had allot of original parts for my bike
Thanks they are cheaper than bikebandit, but both sites do not offer the main jet. gonna check with patrick and sudco if I cant get something to work Mrcycles. has a complete assembly for 211.00
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Old 05-22-2009, 10:24 AM   #15
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did you hear back from motorcycle garage sale home dude about the other BW?
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