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KZ550 Main Jet Size Advice Needed!
- loudhvx
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As a matter of fact, make sure all 4 intake manifold vacuum ports are capped off.
1981 KZ550 D1 gpz.
Kz550 valve train warning.
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- 550rider
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1983 KZ550 LTD
1989 ZX-10 Ninja
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- 550rider
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Overall, I think idle to 1/4 throttle is fixed, as well as 3/4 to WOT. Right now, the main focus is the 1/2 to 3/4 throttle issue.
1983 KZ550 LTD
1989 ZX-10 Ninja
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- Patton
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Objective being to help determine whether existing mid-range is too lean or too rich.
Good Luck!
1973 Z1
KZ900 LTD
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- loudhvx
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Use a guitar string as the shim wire for the retainer.
1981 KZ550 D1 gpz.
Kz550 valve train warning.
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- loudhvx
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1981 KZ550 D1 gpz.
Kz550 valve train warning.
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- loudhvx
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1981 KZ550 D1 gpz.
Kz550 valve train warning.
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- 550rider
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1983 KZ550 LTD
1989 ZX-10 Ninja
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- loudhvx
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so if I use a shim washer that is 1mm thick under the stock clip, that would be similar to moving the clip down one notch on an adjustable needle?
Yes, correct. Be sure to use a wire ring in the slide like I have shown, but, obviously, use a thicker wire. Without it the retainer assembly will not sit parallel to the bottom of the slide. It will rock on the needle as a high-spot. When it's assembled, the needle should rotate freely, but have little to no end play.
Also, using shims raises the needle relative to the slide, but in fact, it also lowers the slide relative to the throttle shaft. This simply means you will have to turn-in the idle-speed screw to get back to the original idle position. You will also have to increase the choke's fast-idle setting. This is easily done if you do this mod:
www.geocities.com/loudgpz/GPZchokeScrewMod.html
1981 KZ550 D1 gpz.
Kz550 valve train warning.
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- kenball1980
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- Patton
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kenball1980 wrote: ... scared of running too lean....
Could consider spark plug readings at different throttle positions (throttle chop testing) to determine appropriateness of the air/fuel ratio.
Accurate testing requires good ignition (strong and properly timed spark) and decent compression with valve clearances within specs, and carbs in good serviceable working condition (clean passages, correct assembly, proper fuel levels, ample fresh clean fuel supply). Excessive oil burning can also make it impracticable to do plug readings.
Good Fortune!
1973 Z1
KZ900 LTD
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- loudhvx
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The plugs will tell you if you are way out.
Another thing to do, especially since you shimmed the needle, is check your WOT slide position. It should be right at the top of the throat. From the factory it's usually a little higher. This is a good safety trick if you are unsure. By setting the slide above the throat opening, the mixture will get a richness boost when the throttle is wide open at the stop. But ideally you want to find the correct main instead of relying on the boost. If you get the sensation of speeding up as you close the throttle very slightly from WOT, then the WOT stop postiion is likely too high.
I have some details on that in the TK22 site in my sig.
1981 KZ550 D1 gpz.
Kz550 valve train warning.
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