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help with quad carbs |
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Home away from home  
Joined:
2006/10/6 1:21
From Midway City, California
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ive been having trouble with some quad carbs that i got for my 1200. its running rich to a point where the engine is getting bogged down and dying. does anyone know what jet size (they use mikuni jets) i could use to rectify this problem?
Posted on: 2011/7/21 4:09
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Re: help with quad carbs |
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Home away from home Joined:
2006/10/6 1:21
From Midway City, California
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bumpety bump bump bump!
Posted on: 2011/7/21 16:41
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if it was easy to restore, they would call it chevrolet
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Re: help with quad carbs |
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No life (a.k.a. DattoMaster)  
Joined:
2009/8/26 6:58
From mandurah
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Do you know what model the carbs are or what bike they came off ?
Might be able to find a manuel for your specific carbs and see what jets you can change to correct it
Also ,what rpm is it at when it bogs down and dies ,if you can find out what circuit is too rich ,you might be able to take it to a bike shop and see what jets are available
Good luck
Cheers
Posted on: 2011/7/21 17:37
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77 1200 ute
77mm bore a15 ,12:1 comp
ported and reconed h89 head
fairly aggro cam ,billet rocker spacers
twin 40mm solex carbs on bpro manifold
MSD 6al2 with 2 step limiter
4speed 60a box
hd clutch
2 inch exhaust
locked 4:11 ute diff
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Re: help with quad carbs |
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Home away from home Joined:
2006/10/6 1:21
From Midway City, California
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yeah i already contacted the manufacturer because hte stuff on their site wasnt very helpfull, i was just wondering if anyone here had any similar issues.
if i drive normally, lets say im driving and let off the gas to stop at a stop light, etc. the rpm's will start dropping and it will die, but not all the time.
Posted on: 2011/7/21 20:13
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_________________
if it was easy to restore, they would call it chevrolet
don't piss off America, or we will bring democracy to your country
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Re: help with quad carbs |
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Moderator  
Joined:
2001/5/3 7:04
From 48 North
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Contentmaster
Usermaster
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This is fairly common with motorcycle carburetors -- they are jetted very differently from automobile carburetors.
The accelerator circuit is different, maybe something to do with accelerating a 500 lb bike versus a 1600 lb car. So guys richen up the main jetting to compensate. But it's the wrong way to fix the problem.
Take your too-rich jets and note the numbers. If they are 150, try 140 instead. Test it not by flooring it, but by slowly rolling on the throttle.
To tune it for large throttle openings, work on the accelerator circuit. If it is a slide carb this means changing needles or moving the needle up.
Posted on: 2011/7/21 21:22
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Re: help with quad carbs |
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Just popping in
Joined:
2011/1/10 7:00
From Melb
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My dad has a magazine article on this very subject i will post the article and magazine details maybe you can order an issue. I believe it was a pommy magazine Performance Fords.
Posted on: 2011/7/21 23:12
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Re: help with quad carbs |
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Just popping in
Joined:
2011/1/10 7:00
From Melb
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I was wrong the Magazine is Classic Ford November 2010 issue page 45. I am sure this is available worldwide, hope the article helps you it was quite informative. You may want to look at this website as the article was written about these guys that work on bike carb conversions for a living. www.boggbros.co.uk Cheers Ranny.
Posted on: 2011/7/21 23:56
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Re: help with quad carbs |
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Home away from home 
Joined:
2004/7/22 4:52
From Seattle ,WA.
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daves right, if slide carbs, round or flat figure out & note what the needle position clip is in & play with it from there. When tuning my Mikuni's on the old H1 repositioning the needle clip - ie, the needle position in the jet - makes dramatic differences in how the bike performs all across rpm/speed range. I'm not sure what your running but usually the idle circuit is completely separate from the primary fuel circuit in the carb although the needle position plays an important part in how it idles too.
what kind of carbs are they & what are they off?
Posted on: 2011/7/22 2:06
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Re: help with quad carbs |
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Home away from home Joined:
2006/10/6 1:21
From Midway City, California
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Registered Users
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Posted on: 2011/7/22 3:52
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_________________
if it was easy to restore, they would call it chevrolet
don't piss off America, or we will bring democracy to your country
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Re: help with quad carbs |
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No life (a.k.a. DattoMaster) 
Joined:
2002/10/28 6:49
From under the Firmament LOL no twiglight effect BS
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Which mode Lecs?
Posted on: 2011/7/22 4:03
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