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08-02-2007, 01:55 PM
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#1 (permalink)
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Senior Member
Joined: Apr 2007
From: Nowhere, MO, USA
I Ride: 1997 ZX-9R
Posts: 462
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how to fix carb stumble on 2000+ 9r's?
title says it all. roll on the throttle and there a little empty spot then more power than should be. how can you smooth this spot out? about 3k rpm on an 01'. i'm sure theres a way... anyone?
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08-04-2007, 07:31 AM
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#2 (permalink)
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Newbie
Joined: Apr 2007
From: Canada
I Ride: 01 zx9r
Posts: 27
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I've heard Ivans Jet Kit is suppose to eliminate this problem
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08-04-2007, 10:44 AM
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#3 (permalink)
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Senior Member
Joined: Apr 2007
From: Nowhere, MO, USA
I Ride: 1997 ZX-9R
Posts: 462
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ivans? anyone else got any ideas. i feel like this should be a simple problem (and popular) to fix.
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11-21-2007, 09:29 AM
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#4 (permalink)
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Newbie
Joined: Nov 2007
From: SoCal
I Ride: '03 ZX9R-F2
Posts: 12
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Recently saw an article addressing this problem in an older issue of Motorcyclist Magazine (maybe '02?) on the 9R. The problem lies in the pilot jet (or slow jet) system being to lean. They didn't want to take the carbs completely apart, so they took just the slides out (with carbs still in the bike) and shimmed the needles up with a washer. This richened up the air/fuel mixture at part throttle and got rid of the stumble.
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11-21-2007, 05:34 PM
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#5 (permalink)
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Senior Member
Joined: Nov 2007
From: Nowhere, NE Missouri
I Ride: Kawasaki Zerox9R
Posts: 168
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... was there any specifics or did it just say they "shimmed" it? size is a pretty important factor ya know!  |
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11-21-2007, 07:03 PM
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#6 (permalink)
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Newbie
Joined: Nov 2007
From: SoCal
I Ride: '03 ZX9R-F2
Posts: 12
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They did not give any specifics; just a quick reference to fix to a common problem. I would try using a narrow washer one a time until the stumble is gone.
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11-21-2007, 09:27 PM
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#7 (permalink)
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Newbie
Joined: Oct 2007
From: pa in the woods 18421
Posts: 20
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0.5mm shim
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11-22-2007, 08:57 AM
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#8 (permalink)
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Member
Joined: Nov 2007
From: JACKSON, TN
I Ride: 98,99,00,01,02and03 zx9r
Posts: 35
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I have also heard that an ignition advancer helps with this problem
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11-24-2007, 08:45 AM
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#9 (permalink)
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Member
Joined: Aug 2007
From: Denver, NC
I Ride: 2000 ZX9R
Posts: 30
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Whats this shim everyones talking about?
__________________
2000 Kawasaki ZX-9R- D&D full system, Gears, RC component wheels, lowered.. and on and on.
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11-24-2007, 10:08 AM
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#10 (permalink)
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Senior Member
Joined: Nov 2007
From: Nowhere, NE Missouri
I Ride: Kawasaki Zerox9R
Posts: 168
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.5mm? will definately try that. hope it works! really don't like messing with carbs! REALLY. DO. NOT. LIKE.
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11-26-2007, 12:21 PM
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#11 (permalink)
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Newbie
Joined: Jul 2007
From: redford, mi
Posts: 27
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A friend of mine bought a '98 zx-9r same time as I did and they both had the 3 grand stumble.I didn't notice it until he mentioned it.basically if I was stopped and held it at 3 grand,it would stumble but on the go i never noticed.I guess the question is how much time do you spend at 3 grand? Is it really an issue ? If it is the before mentioned Ivan is the man I would talk to
also a change in gearing might take it out of equation for you.
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11-26-2007, 07:48 PM
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#12 (permalink)
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Senior Member
Joined: Sep 2007
From: Sarasota, Florida, via Chicago ,Montreal,PQ & other places around N.A.
I Ride: 99'ZX9R,02'ZZ-R1200,03'Z1000,03'ZG1000GTR
Posts: 433
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Green..you can fine em' at Radio Shack in packages of 10, I believe. 020" ..and it really works.
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11-28-2007, 04:46 PM
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#13 (permalink)
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Senior Member
Joined: Nov 2007
From: Nowhere, NE Missouri
I Ride: Kawasaki Zerox9R
Posts: 168
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thanks 911! winter project on a friends 9! off to radio shack then...
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11-28-2007, 05:19 PM
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#14 (permalink)
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Newbie
Joined: Apr 2007
From: Canada
I Ride: 01 zx9r
Posts: 27
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Quote:
Originally Posted by oldgreenmachinetwo
thanks 911! winter project on a friends 9! off to radio shack then...
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Let us know how it goes. I do remember reading an article about using a shim (can't find the link right now) but it did say that although it worked wonders on the C models, there was no benefit on the E models. |
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11-28-2007, 05:25 PM
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#15 (permalink)
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Newbie
Joined: Apr 2007
From: Canada
I Ride: 01 zx9r
Posts: 27
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11-29-2007, 12:42 AM
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#16 (permalink)
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Newbie
Joined: Nov 2007
From: SoCal
I Ride: '03 ZX9R-F2
Posts: 12
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OK, Feb 2000 Motor Cyclist says "to do it right, you'd replace the slow jet with the next biggest size (stockers are 38's)". You need to remove the carbs to do this, so they tried something easier; remove the tops of each carb and raise each jet needle 0.5mm with a little washer. They say this is an old trick and it is as "effective as ever on the ZX9. An easy modification, and almost free."
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07-16-2008, 11:25 AM
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#17 (permalink)
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Newbie
Joined: Nov 2007
From: SoCal
I Ride: '03 ZX9R-F2
Posts: 12
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So did anyone have any luck using the 0.5 mm washers?
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