F2 Carbs

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F2 Carbs

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F2 Carbs - 9/3/2008 5:14:40 PM

cbr600f3DD

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will they fit the F3?

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RE: F2 Carbs - 9/3/2008 5:26:02 PM

td137

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I''ve heard they will as long as you use the right carb boots that mate to the engine. F2 carbs would need F3 boots to go to F3 engine. I have NOT done this just heard this. Maybe someone can confirm.

(in reply to cbr600f3DD)

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RE: F2 Carbs - 9/3/2008 5:30:17 PM

cbr600f3DD

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if someone can confirm this that''d be awesome. I was going to rebuild mine, but I don''t know much about Carbs and for what it''d cost to have mine rebuilt i could buy some off ebay. unless Carbs are easy to figure out?

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RE: F2 Carbs - 9/3/2008 5:33:21 PM

Hurricane rider

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rebuilding carburetors is VERY easy. if you''d like I do this for a hobby and would be more than happy to do it for you, or explain how to do the job. it''ll be significantly cheaper than replacing your carbs.

(in reply to cbr600f3DD)

Post #: 4

RE: F2 Carbs - 9/3/2008 5:38:16 PM

cbr600f3DD

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I guess i''''ll just look for a write up on f3 rebuilds then. if it''''s really that easy. i mean, i do all my own work on my bikes, but there are some things i don''''t feel comfortable with. i think i have a float sticking in my 3rd carb. atleast that''s what i''ve gathered from reading up on the issue i''ve been having. is that easy to check?

(in reply to Hurricane rider)

Post #: 5

RE: F2 Carbs - 9/3/2008 5:44:16 PM

td137

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If you think the float is sticking, tap the bowl and see if it fixes the problem. If it does, pull the carbs, remove that float bowl and inspect the float assy/valve.

What is the issue you have?

(in reply to cbr600f3DD)

Post #: 6

RE: F2 Carbs - 9/3/2008 5:55:15 PM

cbr600f3DD

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the issue i''ve been having is my bike will sputter under light acceleration or when i''m just cruising it will act like i''m rolling off the throttle then pick back up to speed, but when i get on it, it goes away. that''s the only thing that make me think floats, but again, I don''t know the mechanics of carbeurator.

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Post #: 7

RE: F2 Carbs - 9/3/2008 7:07:17 PM

Hurricane rider

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I would recommend you remove your carburetors, and simply pull the float bowls off. you will probably want a dremel with a cutting wheel to put a flathead slot into each screw on the bowls, as some of them may be quite tight and they''re VERY soft metal.

I speak from experience on that one too. alternately, you could pull one screw out, go to a store somewhere and match the thread and replace with allen heads of equal length to eliminate the issue.

once you have the float bowls off, basically use a can of spray carb cleaner, or PB blaster and a toothbrush to scrub the bowls, any dirt you see visible, and such.

removing the pins that hold the floats in place is a bit of a PITA if they''re stuck. note this is ESSENTIAL to cleaning the dirt out of your carbs because you need to take the seats out to get all the dirt that may be lurking under them. 10mm socket will take them I bet.

an 8mm wrench will remove the main jets so that you may clean them, and the orifices under them.

hopefully this helps. I''ve got a set of EX250 carbs that I will use for photo purposes if you wish to have pics. PM me if you need help.

(in reply to cbr600f3DD)

Post #: 8

RE: F2 Carbs - 9/3/2008 8:16:52 PM

td137

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Sounds like you may have a pilot jet that is dirty. Low throttle opening is probably your pilot jet(s)...one per carb. If it pops/backfires on deceleration (engine braking) that would also indicate pilot issue (lean mixture).

Here''s a reference. I''ve seen better but this was a quick find...
http://www.ducatitech.com/2v/img/fcr_graphs.gif

If you going to take the carbs off, you can check both the jets and the floats easily. Remove bowls, check that floats and float valves are working properly then remove pilots and inspect them. While you''re in there, check the mains, record all sizes, clean with carb cleaner and put back together.

(in reply to cbr600f3DD)

Post #: 9

RE: F2 Carbs - 9/3/2008 9:24:44 PM

Hurricane rider

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as I see it, if you pull the carbs, remove as much as you physically can and remove ALL traces of dirt possible.

that was the source of my 87''s dumping fuel out the overflows, was rust in the tank, that got past the fuel filter and built up behind the seats for the float needles.

(in reply to td137)

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RE: F2 Carbs - 9/3/2008 9:35:03 PM

cbr600f3DD

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Thanks a ton for all this help, guys. Yeh, my bike has definately been backfiring alot more since this issue has popped up. I''ll be off all day tomorrow, so it''s looking like I''ve got a project. I pulled my whole airbox apart and noticed there was a small bit of fuel in the box. and my filter smelled like fuel. what could this be?

(in reply to Hurricane rider)

Post #: 11

RE: F2 Carbs - 9/5/2008 8:55:46 AM

td137

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Not unusual to find a little bit of wetness or a sheen in spots inside the airbox. That''s normal. I believe the crankcase vents to the airbox. It''s probably a bit of oil residue. I''ve heard that if you were to overfill the engine with oil or have a little too much in the engine, you will see a lot more of that residue in the airbox.

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RE: F2 Carbs - 9/5/2008 2:12:40 PM

lonewolfcbr

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If i remember correctly...F2/F3 carbs are different....F3 carbs are set up for ram air...don''t think the F2 carbs would like that very much as we have horrible problems with just adding a K&N filter on F2''s and getting too much air for the carbs

(in reply to td137)

Post #: 13