CBR 600F2 1991 - 1994 CBR 600F2

Have a feeling I overtightened my jets....

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Old 04-02-2009, 01:22 PM
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Default Have a feeling I overtightened my jets....

I cleaned the carb so its one less thing I have to do before its all done and I while I have some down time waiting for my front tire and my darn rear sprocket.

Which jet do I need to back off like 2 screws? I mean I didn't crank it down but i turned it until it is tight. Think it should be fine or do I back them off a little?

 
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Old 04-02-2009, 03:10 PM
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they're fine they bottom out and you can't tighten them too far
 
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Old 04-02-2009, 06:26 PM
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The screw that is external to the float bowl with the head shaped like a "D" is called your mixture screw.

That screw should never be tightened, only screwed in until lightly seated then backed out as per manuals specifications (2 1/4 turns I think, can't remember...)
 
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Old 04-02-2009, 06:34 PM
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The one that is like on the out side of the bowl? Them where DIRTY. Pretty sure I tighten them down too.
 
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Old 04-02-2009, 06:40 PM
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Yes they are outside of the bowl, they require the special "D" shaped tool (easily made at home with steel brake line)

If you tightened them down you have probably damaged the tips and will need to replace them... Take them back out and make sure there are no marks near the end of the needle.

The way these jets work is that the tip of the needle goes through a very small hole, and when they are lightly seated the hole is sealed up. You back it out a couple turns to allow a very controlled amount of fuel to flow through the hole around the tip of the needle.

When you tighten these jets the needle gets mashed into the hole, and as it is made of brass which is very soft it will damage the needle and it will no longer flow fuel properly.
 
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Old 04-02-2009, 07:04 PM
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Ok so chances are I didn't take it out then if I need a special tool. I didn't use anything other than a screwdriver.
 
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Old 04-02-2009, 07:14 PM
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Old 04-02-2009, 07:17 PM
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ok, I didn't touch them.

I took out the 2 in the pic and then cleaned the bowls and the little passage ways. I also did the ones on the actual bowl covers (dont know the proper name).

So I should be good?
 
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Old 04-02-2009, 08:06 PM
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The big jet in the middle has 2 pieces, the small jet that screws into the base is the "Main" jet and the base is the main jet holder, both need to be removed and cleaned.

The screws on the bowl covers are just drains, not jets
 
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Old 04-02-2009, 08:49 PM
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Yeah I pulled them apart and sprayed them out well.

Them drains where dirty.

Ok, cool, cant wait to start it up and take her down the road!!! Scared about the new tires!

Thanks again hersh!
 
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