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Jet needle improves acceleration. 15 Nov 2012 10:21 #558453

  • LarryC
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:lol:

Here's the flow chart you really want...


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Larry C.
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Jet needle improves acceleration. 16 Nov 2012 18:11 #558690

  • baldy110
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LarryC wrote: :lol:

Here's the flow chart you really want...


Attachment image06.png not found


I like it. In fact I will hang this quote in my garage.

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Jet needle improves acceleration. 21 Nov 2012 21:49 #559529

  • donthaveakawman
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size 136 jets in there....needle-jet to say it does alright fool mileage seems to have increased;) .

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...
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Last edit: by donthaveakawman.

Jet needle improves acceleration. 22 Nov 2012 04:23 #559582

  • donthaveakawman
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so, I noticed the following 4 cylinder kz models, when researched have the following hp to bore x stroke ratio's, all being oversquare(bore larger than stroke)
-80 kz550 fx makes 58hp, 58x54
-80 650 f, about 64hp 62x54
-80 750 l 74hp 66x54
-80 1000 ltd 95 hp 69x66
-2004 z750 68x50 100 hp
-2004 z1000 77x50 127hp
so if the larger bore makes bigger hp per cc vs torque then why mess around.

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Jet needle improves acceleration. 22 Nov 2012 04:52 #559584

  • bountyhunter
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baldy110 wrote:
I like it. In fact I will hang this quote in my garage.


I still like the sign I saw back in the deep part of the shop at Grand Prix Kawasaki:

SHOP LABOR RATES:

Basic Rate: $60/hr

If You Watch Me Work: $150/hr

If You Worked On It First: $300/hr
1979 KZ-750 Twin

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Jet needle improves acceleration. 22 Nov 2012 07:59 #559588

  • donthaveakawman
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bountyhunter wrote:

baldy110 wrote:
I like it. In fact I will hang this quote in my garage.


I still like the sign I saw back in the deep part of the shop at Grand Prix Kawasaki:

SHOP LABOR RATES:

Basic Rate: $60/hr

If You Watch Me Work: $150/hr

If You Worked On It First: $300/hr


thank you, that is funny

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Jet needle improves acceleration. 06 Jun 2013 09:01 #591052

  • baborz72
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Hi. I have this very same bike with thew very same problem.I put pods on and fabbed a 4-2-1 header. It is very lean during the mid and was lean on the top, but not as bad. Ran a 125 mainjet and she's too fat. Going back to a 120 main and going to run a different needle. I turned my needles down by hand and it got significantly better, but I screwed the off-idle up. I am convinced that I am on the right track with a needle swap. Going to run a 5FL14. I will post the results.
It'll go...or...It'll blow!

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Jet needle improves acceleration. 06 May 2014 19:09 #631593

  • nads.com
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Does it idle smooth and steady? Are all plugs th same color now? You never said how It runs at idle now, was just wondering if you have a plug cap that is bad.
The following user(s) said Thank You: Tomolu5

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Jet needle improves acceleration. 18 Mar 2016 15:37 #716073

  • car5car
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Patton wrote: For carb tuning considerations, if not already aware ---

Main jet size has no effect on air/fuel mixture until after 3/4 throttle, and has most effect at wot where the jet needle is high enough in the needle jet to allow all mixture available from the main jet to pass through the needle jet.

Jet needle taper and position in the needle jet (plus slide cutaway) governs air/fuel mixture from 1/4~3/4 throttle.

The pilot jet governs air fuel mixture from idle~1/4 throttle.
Up to 1/4 throttle position on large Kaw fours produces a surprisingly brisk road speed.

There is a progressive transition as the jet needle takes over from the pilot jet, and another progressive transition when the jet needle thereafter surrenders to the main jet (as the main jet supplies the needle jet absent limitation by the tapered jet needle).

Pods are typically more difficult to tune (than the stock air box) over the entire range of carb operation.

Good Fortune! :)

Thanks, very interesting about transition from needle to main.
96 Yamaha Royal Star
82 Yamaha Virago 920

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Jet needle improves acceleration. 25 Mar 2016 06:37 #717256

  • zirafin
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i have ?
kz550 b2 .tk22
i tace out jet needle ( just 1 to look ) its ok o i need to pot Needle Retaining E Clip lower ??
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Jet needle improves acceleration. 27 Mar 2016 06:52 #717554

  • loudhvx
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Never mind, old thread.

To Zirafin, probably best to keep posts for your bike on your main discussion thread, until the problems are solved. It's easier to help that way.

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Jet needle improves acceleration. 25 Apr 2018 22:27 #782385

  • Tesk
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My mechanic suggested me to buy a 140 jet because I recently bought air pods and my exhaust system is a 4 to 1. My motorcycle is a KZ 750 ltd 1982. Is 140 jet a good decision or nah?

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