CBR 600F3 1995 - 1998 CBR 600F3 Forum

Next round of attempted repairs

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Old 09-15-2009, 10:46 PM
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Default Next round of attempted repairs

The lack of power is still here. Bad enough that I'm gonna park the bike until the next attempt is ready: re-jetting the bike.

Knowing the main jets aren't stock (or anywhere near any jet kit I've seen), I decided to take the carbs back as near to stock as possible. OEM wasn't cost effective so a Dynojet stage 1 jet kit has been ordered.

I'm also positive the CCT has gone. Somewhat concerned how much damage that can do to the engine but it hasn't been been noticeable till very recently.

Any thoughts?
 
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Old 09-16-2009, 06:34 AM
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you said your main jets arent stock... can you read the jet number on top of it, and the other ones??
 
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Old 09-16-2009, 08:43 AM
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Originally Posted by Kuroshio
I'm also positive the CCT has gone. Somewhat concerned how much damage that can do to the engine but it hasn't been been noticeable till very recently.
Any thoughts?
None. Nobody has been able to personally report a situation where a loose CCT has actually caused a failure. There are reports of people going 75k on a loose CCT with no ill effects.
 
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Old 09-16-2009, 08:45 AM
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Originally Posted by Kuroshio
re-jetting the bike.
Any thoughts?
Don't. Jetting doesn't just involve swapping the jets; it involves drilling new holes to accomodate those jets. The new jets may be too small for the existing holes, and you can't "drill" the holes into being smaller. Also, I still contend that the jets are not your problem. It also involes days of tedious tuning and testing, but you may want to do all that anyway to figure out your problem. Jetting really requires a dyno to be done properly, as you need a precise was of knowing what effect your needle positions are having on things. Barring the dyno, you may at least want to install an air/fuel guage, so you can eyeball it like that.
 

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Old 09-16-2009, 08:59 AM
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145k on carbs 1 & 4. 142k on 2 & 3. Had a stock air filter but now has a k & n. Still has a stock exhaust.
Originally Posted by intiractive
you said your main jets arent stock... can you read the jet number on top of it, and the other ones??
 
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Old 09-16-2009, 09:32 AM
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Originally Posted by johnnyx
Don't. Jetting doesn't just involve swapping the jets; it involves drilling new holes to accomodate those jets. The new jets may be too small for the existing holes, and you can't "drill" the holes into being smaller. Also, I still contend that the jets are not your problem. It also involes days of tedious tuning and testing, but you may want to do all that anyway to figure out your problem. Jetting really requires a dyno to be done properly, as you need a precise was of knowing what effect your needle positions are having on things. Barring the dyno, you may at least want to install an air/fuel guage, so you can eyeball it like that.
Well I'm open to suggestions. Running out of small things to attempt. Getting ready to hit major repairs. The jets are way off from stock. The dynojet stage 1 kit includes stock size main jets. It really should be done anyways.

Fuel filter is a possible. Spark plugs would just he a symptom since I just replaced them. If they're already bad then something is causing that. Fuel pump now works. Carbs are clean. all the hoses are touted by the book and fiche.
 
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Old 09-16-2009, 11:25 AM
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Originally Posted by Kuroshio
Well I'm open to suggestions. Running out of small things to attempt. Getting ready to hit major repairs. The jets are way off from stock. The dynojet stage 1 kit includes stock size main jets. It really should be done anyways.

Fuel filter is a possible. Spark plugs would just he a symptom since I just replaced them. If they're already bad then something is causing that. Fuel pump now works. Carbs are clean. all the hoses are touted by the book and fiche.
. . . . . . . . .I will bet a pint of ice cream that the Stage 1 kit is actually SMALLER than stock. The 1st-gen F3's actually ran a bit rich stock, and Dynojet corrected that with the smaller jets, which actually creates about a 5% performance increase while also increasing or maintaining fuel economy.

Other than that, swap the fuel filter. It's like $7, and right there. Have you balanced the intake vacuums? I can't remember. That made a HUGE difference for me in the same situation.
 
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Old 09-16-2009, 05:48 PM
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Originally Posted by johnnyx
. . . . . . . . .I will bet a pint of ice cream that the Stage 1 kit is actually SMALLER than stock. The 1st-gen F3's actually ran a bit rich stock, and Dynojet corrected that with the smaller jets, which actually creates about a 5% performance increase while also increasing or maintaining fuel economy.

Other than that, swap the fuel filter. It's like $7, and right there. Have you balanced the intake vacuums? I can't remember. That made a HUGE difference for me in the same situation.
Have not balanced the carbs yet. Going to have to buy a tool + adapters. IIRC when I had the carbs off, there were screws instead of plugs for hoses. Are our fuel filters available from local auto parts stores (pepboys / autozone) or do I need to visit the stealership again?
 
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Old 09-16-2009, 08:47 PM
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when i got my fuel filter only my honda shop had it. still cheap though.
 
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Old 09-16-2009, 09:04 PM
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Originally Posted by intiractive
when i got my fuel filter only my honda shop had it. still cheap though.
stopped in pepboys while walking to get some smokes. They had an inline fuel filter for hoses 1/4" diameter rated for 10 psi. Any good?
 


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