Which jet kit to buy - 900RR - Honda Motorcycles - FireBlades.org
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post #1 of 11 Old 04-20-2009, 6:46 PM Thread Starter
 
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Which jet kit to buy - 900RR

Any recommendations on a jet kit for my 98 900RR? I'm going to be cleaning and syncing the carbs, putting on a different exhaust and replacing the air filter. I would like to maintain my bike's excellent low-end and mid-range. Top speed isn't so important as this bike is mainly for commuting.

Is it even worth it to put in a jet kit or should I just keep it as is?
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post #2 of 11 Old 04-20-2009, 7:10 PM
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Re: Which jet kit to buy - 900RR

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Originally Posted by cbrsmurf View Post
Any recommendations on a jet kit for my 98 900RR? I'm going to be cleaning and syncing the carbs, putting on a different exhaust and replacing the air filter. I would like to maintain my bike's excellent low-end and mid-range. Top speed isn't so important as this bike is mainly for commuting.

Is it even worth it to put in a jet kit or should I just keep it as is?
What are you trying to address with the jet kit?
I haven't used a jet kit since 1990 but generally they're aimed at getting more peak power rather than midrange.

"I won't forget that ride for a while. Maybe you're right. Living fast might be worth the final crash. Maybe that's the secret you fliers know." - Flight of the Intruder
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post #3 of 11 Old 04-20-2009, 7:19 PM Thread Starter
 
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Re: Which jet kit to buy - 900RR

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What are you trying to address with the jet kit?
I haven't used a jet kit since 1990 but generally they're aimed at getting more peak power rather than midrange.
Yea, I don't know too much about jet kits I assumed they were more like power commanders or other EFI chips that let you adjust and smooth out your powerband however you'd like (of course it would much more involved turning screws on a jet kit rather than plugging a Power Commander into a laptop).

If I want to maintain the low/midrange, should I just stay with the stock jets?
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post #4 of 11 Old 04-20-2009, 7:22 PM
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Re: Which jet kit to buy - 900RR

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Yea, I don't know too much about jet kits I assumed they were more like power commanders or other EFI chips that let you adjust and smooth out your powerband however you'd like (of course it would much more involved turning screws on a jet kit rather than plugging a Power Commander into a laptop).

If I want to maintain the low/midrange, should I just stay with the stock jets?
The midrange is a result of intake and exhaust restriction. To get peak power you open both up. To boost midrange you reduce them.
The jetting is purely to allow the engine to combust effeciently depending on how much and how fast the airflow passes through the chamber.
I'd wait and see how the bike is after you replace the muffler and then decide if it needs jetting to suit.

"I won't forget that ride for a while. Maybe you're right. Living fast might be worth the final crash. Maybe that's the secret you fliers know." - Flight of the Intruder
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post #5 of 11 Old 04-21-2009, 2:13 AM
 
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Re: Which jet kit to buy - 900RR

factory pro - apk, no contest
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post #6 of 11 Old 04-22-2009, 6:29 PM
 
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Re: Which jet kit to buy - 900RR

Factory Pro in mine--works great.

Helpful advice, get the other mods first, ie pipe, airbox or filter kit, ingition advance what have you, and then work with the jet kit. Any changes or moads relating to air/fuel system will require an adjustment in the jetting to get it to your liking. Be prepared to do some reading and experimenting till you get it right. I just changed full pipe systems again this year from Yosh to D&D again and needed to adjust things. Not real difficult, but will take some of your time to dial it in right.

Once you get what you are going to put on it, post it for some ideas for other's setups.
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post #7 of 11 Old 04-23-2009, 5:51 AM
 
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Re: Which jet kit to buy - 900RR

If you're changing the air filter and exhaust then you'll probably need a re-jet as the 900's are notorious for not taking these changes too well without it. This was certainly the case for my bike.

I went with Dynojet, purely because there's a Dynojet centre with a rolling road in the town where I live. Also, the chap that owns it goes to my gym, and is a lot smaller than me - which might have been useful if they screwed it up!! (just kidding - anyhow they did a good job, runs lovely now).
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post #8 of 11 Old 04-23-2009, 6:12 AM
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Re: Which jet kit to buy - 900RR

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I went with Dynojet, purely because there's a Dynojet centre with a rolling road in the town where I live. Also, the chap that owns it goes to my gym, and is a lot smaller than me - which might have been useful if they screwed it up!! (just kidding - anyhow they did a good job, runs lovely now).
Do you have before and after dyno graphs by chance?

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post #9 of 11 Old 04-23-2009, 6:29 AM
 
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Re: Which jet kit to buy - 900RR

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Do you have before and after dyno graphs by chance?
Well I do, somewhere.... they're buried in the garage I think! They're also hard copy only... I'll see if I can a) find them and then b) take a photo of them, as I don't have a scanner
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post #10 of 11 Old 04-23-2009, 6:31 AM
 
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Re: Which jet kit to buy - 900RR

There was not much of a power gain - 1-2hp if I remember - but before I got it fitted I had a problem when rolling off / back on to the throttle where the bike would hesitate before going again - not good when entering corners! It stopped doing this as soon as I got it re-jetted.
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post #11 of 11 Old 04-23-2009, 4:16 PM Thread Starter
 
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Re: Which jet kit to buy - 900RR

very helpful info all, thanks
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