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Old 08-23-2011, 08:35 AM   #1
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Question Brute force 750 carb sync

Ok guys got a small problem. I dont know if this has been talked about... if so a link would be fine. But..

I have jetted my brute to where I htink it should be by checking spark plugs. Now I have a small poping at idle and a little popping half throttle. If I go wide open it clears rights up. So I read alot about carbs being synced together. So I have ordered a flowmeter. My question is the syncing part. Is there a specification to do in relation to the jet size? Or do I just pick the higher one or lower one and sync together? Any help would be great!

A lilttle info on the atv.
2005 Brute force 750
Hmf full exhaust
K&N air filter
mud insdustires snorkle with outter wear
ehs mudder lid with outter wear
dyna jet (155-160).
and thats all i think that would have to do with this problem
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Old 08-23-2011, 03:17 PM   #2
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Default carb sync

I know the service manual tells you how to sync the carbs,but I forget what it says.I do know the carb butterflies should have the same clearances when they are closed/open,and the vaccum should be the same.
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Old 08-23-2011, 05:37 PM   #3
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Just syncronize them; i.e. draw the same amount of vacuum. It MIGHT help the problem at idle, but won't do anything for the half-throttle issue.
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Old 08-23-2011, 08:24 PM   #4
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The screw that adjust the sync (between the carbs) adj. both at the same time, It opens one as it closes the other
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Old 08-23-2011, 08:45 PM   #5
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U just have to adjust them to where they're the same u also have to wait for it to get to operating temps before adjusting. Ull also prolly have to adjust ur idle while doing it cause it might cause it to idle slow and die if it does that just idle it back up to original idle rpm
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Old 08-24-2011, 05:29 AM   #6
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Default jetting

Also did you check your carb needles.what needles are in there - stock needles NFKK front/NFKL rear.I shimmed my needles with two #3 washers,and it helped the carb stumble go away.Post back on how the sync of carbs go - just curious cause alot of people say you should'nt have to sync normally unless some previous owner played with the syncing.
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Old 08-24-2011, 05:40 AM   #7
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i use a number 30 drill bit to adjust mine i use the idle screw to get it in the front to where its a fine fit in the butterfly . then the sync to get the rear, then all you need to do is reset the idle
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Old 08-24-2011, 06:38 AM   #8
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Thanks guys! I will let everyone bows how it goes this weekend. I'm still waiting on the flow meter. Hope it comes in by Friday!
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Old 08-24-2011, 12:44 PM   #9
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rdm531, my butterflys just touch the bottom wall of the carb venturi wall - is this wrong - not putting you against the wall - just asking. A # 30 drill bit is like an 1/8th inch bit I believe,and that is alot more clearance from the butterfly to carb wall than where mine is set.And it runs ok this way - would it run better set the way your adjusting it?
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Old 09-05-2011, 05:03 PM   #10
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i have a small studder in the bottom end of my 05 bf 750 but its only on take off, and ive heard the carbs could be out of sync and how exactly do you sync them?
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