Some Basic Carb Info--------------------------------------------------------------------------------
Minbo
(11/14/00 11:20 am)
Carb problems
Are the float height measurements in the shop manual? I cleaned my carbs and now it's very rich (stumbles and kills w/o a lot of idle screw) under 6000 rpm. I think I put the floats back in the wrong bowls or something. The top end feels better, but that may be due to the low and mid being so bad. I may order a Factory carb recal. kit if it's under $150. Any other carb advice is welcome. I noticed the main jets are 105. Is that stock?
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Hammer117
(11/14/00 6:47 pm)
Re: Carb problems
The stock mains on my '91 are 102.5's.
The floats control the rpm up to about 3k.
The needles control it to about 7.5k. Then the mains control it from about 8k to redline.
Go to
www.factorypro.com and take the cv carb link at the bottom. There is some excellent info on carb tuning in there.
Shane CCS#217 WERA#417
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Minbo
(11/15/00 10:45 am)
carb problems
Thanks. I'm gonna gonna check the floats and needles. The factory pro recal. kit is $100, but I'll put off getting it unless I have to. A shop I trust wants $500 or so for a complete carb service. So, now's my chance to learn.
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Hammer117
(2/1/01 8:35 pm)
Factory Pro's Website
Go to
www.factorypro.com and click on the cv carb link at the very bottom. It is a must for jetting carbs.
CV carbs do have slides and the B4 diaphram (mine anyway) does not have a notch. The slide/diaphram is made together and the slide will only fit into the carb body in one orientation. Another tip...plug one of the two holes on the bottom of the slide with just enough epoxy. This will improve acceleration a good bit. Don't use too much epoxy because you want to keep the weight to a minimum. Works like a champ for me.
Shane
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Minbo
(2/7/01 3:23 pm)
carb tuning
Thanks for the info. I screwed with 'em as much as I could and I still didn't get things right. Below 6k I'm certain all four weren't firing form the sound and pipe heat. Then above that all hell breaks loose. I finally sent it off to the shop last night. The carb clean/snyc is about $225 plus parts. It's been off the road for 2 long months.
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Minbo
(2/14/01 10:24 am)
carb problems no more
Well, it's fixed. They just needed a thorough cleaning and adjustment. It's a bit more perky and way better throttle response.