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Topic: ZRX Fans  (Read 2438 times)

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sodapop6620
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« on: September 29, 2014, 11:46:09 pm »

I have had my ZRX for 11 years and am thinking about putting smaller jets in the carbs.  Has anyone done this?  I am only using at most 1/4 of the throttle twist and at times it seems a bit choppy.
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« Reply #1 on: September 30, 2014, 11:44:00 am »

Don't know your elevation but at sea level, stock, they run a touch lean to keep Mr EPA happy. That may be the "choppy" response you are feeling. So, if you go down I think you're asking for trouble.

You've heard of everyone and their brother getting Power Commanders and programming their FI bikes, well, they're richening up the low speed circuit.
If you don't care about a slight drop in MPG go a pilot jet bigger or put a shim under the jet needle.
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« Reply #2 on: March 23, 2015, 02:33:22 pm »

a lot late to this post, but jetting to your location is key.    I normally take a stock ZRX and ditch the smaller jets/needles in #2/#3 and replace with the larger jets/needles the #1/#4 have in them.   Also shim with a single .010 washer.    Once that is done set your fuel screws about 1 1/4 or 1/2 turn out to 2 turns (varies by location).   Putting it on a dyno to get it sniffed would be best to get a a/f reading to get it spot on.    

Of course, this is with stock exhaust, and airbox.   No K&N filter at this point, as it flows too much air for the stock exhaust to get rid of.
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« Reply #3 on: March 23, 2015, 07:21:42 pm »


a lot late to this post, but jetting to your location is key.    I normally take a stock ZRX and ditch the smaller jets/needles in #2/#3 and replace with the larger jets/needles the #1/#4 have in them.   Also shim with a single .010 washer.    Once that is done set your fuel screws about 1 1/4 or 1/2 turn out to 2 turns (varies by location).   Putting it on a dyno to get it sniffed would be best to get a a/f reading to get it spot on.    

Of course, this is with stock exhaust, and airbox.   No K&N filter at this point, as it flows too much air for the stock exhaust to get rid of.


I didn't know Kawasaki jetted the carbs different. Sure it hadn't been "tampered" with?

Kawasakis are like lawn mowers. Not much power and changing anything goofs them up.                      Bigsmile
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« Reply #4 on: March 23, 2015, 10:05:18 pm »

yes, at least the 1200s are set up with the outer carbs different from the inner ones.  NAGU needles on inners and NAGZ needles outside, can't remember the jet sizes but something like 92 and 90s...just a couple sizes off from each other.   Has something to do with inners running hotter than outers or something like that.     My simple tune up consists of swapping to all Z needles and shimming, the larger jets across the board, turning the fuel screws out, adding an ignition advancer, unplugging ktric and getting rid of all the emmission crap and pluggin hole in airbox and capping off reed valves.   Bike runs so much smoother and has better throttle response.    

Of course, this is with stock exhaust....mine has not had that for many years.  lol  

« Last Edit: March 23, 2015, 10:13:28 pm by quarter pounder » Logged
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« Reply #5 on: March 23, 2015, 10:17:14 pm »

In the old drag racing days we ran one size smaller main jet in the center cylinder of the three cylinder two strokes.
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Past bikes: Dirt- '74 MX360, SC500 x 2, '77 YZ400, '78 YZ400, '83 CR250, '85 CR250, '86 CR250   
 Street- '74 S3400, H1500, '72 H2750 x 2, '78 GS1000C, GS1000EC x 2, '80 GS1000S, '00 1200 Bandit, '05 FJR1300, '07 ZX14, '06 FJR1300(2 wks), '12 FJR1300
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