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Old 01-30-2010, 06:16 PM   #1
TheCycleGuy
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Default Looking for advice with carbs Bandit 1200

Hi, I just bought a used 2001 Bandit 1200S. Bike has 40,000 miles on it. It came with a Holeshot slip on exhaust, no other engine mods, jetting is stock (I checked). It ran good, but not great. I believed I could make it run better (ha!) so I did some research and did the following mods: 1. removed the rubber snorkel from the airbox (I did NOT cut another hole in the airbox)2. Installed 1 tiny little washer (from Radio Shack) under each carb needle seat. 3. removed the brass plugs and adjusted each air screw to 2.5 turns out.

Now the bike accelerates really well, but at steady throttle it is not smooth. It has a miss that's noticeable. The other thing is that, at idle, if I open and close the throttle quickly, the revs linger for a second before returning to idle. It does not snap back like it should.

Any advice would be much appreciated.
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Old 01-30-2010, 07:46 PM   #2
seruzawa
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Steady running is usually set by the primary jet that regulates the CV carb needle position. It sounds like the jetting is a bit lean. You could try a larger primary or maybe raising the needle a bit more.

Holeshot sells a complete jet kit for that bike that goes with their slipon. It might be easier to just buy their kit and not spend hours and hours trying to guess the jetting.
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Old 01-30-2010, 08:29 PM   #3
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You need to stretch then anneal the carb slide-springs to "crispen" the throttle modulation. I don't know what the dimension is for the Bandito, usually 7" to 8", varies with the bike. Check Factory's website to see if they've got instructions to go with a jet-kit.
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Old 01-30-2010, 10:47 PM   #4
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Ditto on the Holeshot kit, they're the ones to call for Bandit carb issues. I had two of them, Longride has one and Seruzawa had one of their predecessers. Those engines are the small block Chevy's of the motorcycle world, easy to get some cheap and serious power out of them. A full Holeshot header and race can, their 5* ignition advancer and jet kit and some GSXR cams will make that an easy 130hp screamer
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Old 01-31-2010, 05:20 AM   #5
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I had an Ivan's kit in mine with a Yosh can. Ran like a champ. no flat spots or stumbling anywhere.
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Old 01-31-2010, 06:36 AM   #6
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Quote:
Originally Posted by longride View Post
I had an Ivan's kit in mine with a Yosh can. Ran like a champ. no flat spots or stumbling anywhere.
Yeah, in your case the only flat spots and stumbling were coming directly from the rider.
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Old 01-31-2010, 12:34 PM   #7
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Quote:
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Yeah, in your case the only flat spots and stumbling were coming directly from the rider.
'Specially when I start drainin' the tequila bottle.
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Old 01-31-2010, 02:00 PM   #8
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Quote:
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'Specially when I start drainin' the tequila bottle.

The flat spot come from your ol' ladies frying pan?
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Old 02-01-2010, 10:05 AM   #9
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Holeshot sells a complete jet kit for that bike that goes with their slipon. It might be easier to just buy their kit and not spend hours and hours trying to guess the jetting.


Then take it to a dyno for conformation. The base settings from the kit will put you right in the ballpark and are easy to intall.
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Old 02-01-2010, 03:15 PM   #10
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Thanks for the advice, and for the comedy!
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