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Old 12-15-2012, 11:01 AM   #1
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Default carb questions or advice

ok 2006 BF 650 SRA

i am going to rebuild my carbs. lot of good deals on ebay for rebuild kits. any one have problems with non OEM rebuild kits?


while i am in there should i rejet or do anything else while i got them off?
i dont drive fast, mainly trail riding and sometimes alot of deep mud...

the bike is factory with the exception that i plan on putting 28 inch tires on it.

any helpfull comments, or advice would be greatly appreciated
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Old 12-15-2012, 12:27 PM   #2
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I personally won't use aftermarket carb kits.
Why do you feel the carbs need rebuilding? They almost never wear out; they just get dirty or gummed up.
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Old 12-15-2012, 01:00 PM   #3
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Default carb

well i just bought it and the guy said it sat a while. it would only idle and run with the choke all the way out. and it would run great.. as soon as you push the choke in it would die. if i gave it gas while pushing in the choke it would run fineover half throttle. less than half it would spit and sputter and backfire occasionaly.

so took carbs out cleaned out the best i could( the 2 jets inside than you can unscrew) reinstalled and now it does run with the choke off but still does not idle correct. and spits and sputters at low rpm.

so i fixed 50 percent of the problem being that now it will idle with no choke as long as i give it a tinny bit on the throttle.(where as before it wouldnt)

also the idle screw is turned all the way in.

so i think i need to take back off and soak the carbs. hopefullt there is just some varnish in the carbs that i could not see or clean with just the 2 jets being removed. and i was thinking that while i had them all apart and soaking that i would need a rebuild kit to put them back togather.

any more advise would be great... thanks
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Old 12-15-2012, 01:11 PM   #4
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There is a screw in each carb that goes into the body; it's the pilot screw. If those are the ones you have turned all the way in, then open them 2 turns. If it is the idle speed that's turned up as fast as it will go, then the carbs are still dirty; most likely the pilot jets and idle circuits.
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FPS 12:1 pistons
FST Stage II Cams
Mild porting
Crossover intakes
Modded airbox
Full Muzzy
Dalton weights
VFJ Springs
Other weird stuff

2011 Stratos 186XT Bass Boat
Mercury Optimax 115hp
Minn Kota 70lb 24v trolling motor
Lowrance Electronics
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Old 12-17-2012, 06:11 AM   #5
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general carb advise: take a little piece of wire or small pick and poke through every single little hole.
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Old 12-17-2012, 06:59 AM   #6
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I'd bet you anything that it isn't a need for the rebuild kits. Best thing you can do is spend that money on a gallon of Gunk parts wash. (I actually think its carburator soak but can't remember) I got mine from Advanced Auto or O'rileys. Either way it comes in a gallon can with a little basket in it. Pull the carbs, disassemble making sure to remove ALL plastic parts, drop it in overnight and then the next day use compressed air to blow out ALL small orfices and reassemble.
My 650 set for like two years with very little running and ethanol gas in it. I had treated the gas but didn't realize it would still do this until now. Mine had green moss looking stuff growing inside the carbs and I even had problems with the fuel pump doing the same thing. I promise you don't want to have to buy one of those things either. Kawie wants like 500 bucks for it.
One other thing I'd recommend you check is the front and rear diff oil. If it has been setting for a while it would be a good idea to get that changed or you might end up like me and be doing a rebuild before long. These things are known for leaking and if it got water inside it before it was parked.... Trust me its a pain in the butt to have to do especially if you could change the oil and not have that problem.
Just a word from one that has been there. Hope you enjoy the ride.
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Old 12-17-2012, 02:15 PM   #7
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Default carbs

thanks for all the advice, i think i am going to break down and soak them and see what happens. am going to buy bowl gaskets and o-rings also.

ill let you know what happens.


thanks again. todd
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Old 12-17-2012, 04:52 PM   #8
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Quote: Originally Posted by VTwinKawi View Post
general carb advise: take a little piece of wire or small pick and poke through every single little hole.
This advice is absolutely critical especially the pilot jets. Sounds like you only took out the main jets. You need to take the pilot jets out also. They are smaller and next to the mains. You should also take the float needle seat out and clean it and inspect (although this doesn't effect idle). Adjust the pilot screws with engine hot and running. Start at 2 1/4 turns out.
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Old 01-19-2014, 02:51 PM   #9
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This may sound dumb but I'm an old guy with limited flexibility. I can access the carb allen head float drain screws & the idle speed adjustment but can't seem to get at the idle circuit mixture screws. Do I have to remove all the higher stuff to get at them? It';s a 650 brute force, 2008.
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Old 01-19-2014, 04:53 PM   #10
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No, get a small pocket screw driver, if there are no plugs over the screws, it should be real easy.


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