Jets - Honda Motorcycles - FireBlades.org
Honda FireBlade Discussion of the Honda CBR 900RR, Honda CBR 929RR, Honda CBR 954RR, and Honda CBR 1000RR Motorcycles.

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post #1 of 9 Old 12-02-2004, 2:40 AM Thread Starter
 
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Jets

Anyone know the easist way to identify what jets are in ur bike?

I dont know if mine has been jetted. My bike is in desperate need of a tune up but it will need jetting first (if its not already).

Poking the Devil with a stick then running away
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post #2 of 9 Old 12-02-2004, 3:18 AM
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Re: Jets

Damn, thought this was about the NY Jets

Yes it's Fast. No you can't ride it.
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post #3 of 9 Old 12-02-2004, 3:31 AM
 
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Re: Jets

Only way i know of is to take ur carbies out and look for the main jet size on the jet itself. Compare those sizes with the stock sizes whatever they may be.
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post #4 of 9 Old 12-02-2004, 8:24 AM
 
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Re: Jets

Quote:
Originally Posted by SouLJahz
Only way i know of is to take ur carbies out and look for the main jet size on the jet itself. Compare those sizes with the stock sizes whatever they may be.
IF you picked it up used I would say without guessing that its stock you have to pull the carbs and take a look
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post #5 of 9 Old 12-02-2004, 10:53 AM
 
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Re: Jets

Get it run up on the dyno and if its got a hugh hole in the torque curve at about 5k its not jetted!!!
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post #6 of 9 Old 12-02-2004, 1:43 PM
 
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Re: Jets

Check the a/f mixture plug. If its been removed it has probably been rejetted.
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post #7 of 9 Old 12-04-2004, 6:22 AM
 
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Re: Jets

The '98 900RR runs #120 main jets in all four carbs. After a foam air filter and a slip-on (slip-ons make a difference on this bike. don't believe me, then compare the stock pipe to a slip-on and do back to back test rides) and a little improving on air flow to the airbox, I increased my main jets in carbs 2 & 3 to #122. I run a little rich in my midrange (most noticable there), but the topend (7000+) pulls harder. I just gotta tune it up, and it will be fine.

Steps:
-Remove seat
-Disconnect fuel lines
-Remove tank
-Remove air box
-Loosen bands along bottom of carbs
-Disconnect choke cable from carb bracket
-Lift/pry carbs upward (I just left the throttle cables connected)
-Open up the metal side (the part towards the back of the bike). The other side is for springs and needles. Be careful about stripping the screws.
-Couple turns with a standard screwdriver, and you've got your main jet out. Check cylinders 2 & 3 first, since those are the most likely to be modified.
-If your jet says 120 on it, you're stock. 122, 125, 128(!!)... it's been rejetted.
-Put bike back together

I can strip the bike down, swap springs, needles, and jets, and put the bike back together and have it running in under 40 minutes now. First time took a little longer though.
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post #8 of 9 Old 12-04-2004, 6:28 AM
 
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Re: Jets

Quote:
Originally Posted by big pimpin
Check the a/f mixture plug. If its been removed it has probably been rejetted.
I don't see why a carbureted bike would have this, since the carbs don't adjust to a rich/lean signal from an O2 sensor like an EFI bike does. The 900RR is a mix of old school tech (that my carbureted domestic car mind can follow) and some random electro-trickery, so I'm not saying that it doesn't have one. I just never noticed anything like this when I wrapped my header the other day.
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post #9 of 9 Old 12-05-2004, 5:31 AM Thread Starter
 
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Re: Jets

thanks 66drop....muchos gracias

Poking the Devil with a stick then running away

Last edited by Cowboy1600; 12-05-2004 at 5:32 AM.
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