KZR's Bikes of the Month for 2024

80 kz750h Ltd

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06 Jul 2021 09:19 #851377 by MarcG
80 kz750h Ltd was created by MarcG
Hey all new here can someone please advise me on my 80 h1 float height spec saw previous post about wet vs dry height not sure what that means but pissin out all overflows want to set floats before clear tube test thx!

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06 Jul 2021 11:35 #851384 by TexasKZ
Replied by TexasKZ on topic 80 kz750h Ltd
There is no float height specification. The clear tube method is how fuel height is measured. It is explained in the factory service manual beginning on page 155,
kzrider.com/modules/ServiceManuals/KZ750E1&H1.pdf

If your carburetors are overflowing badly, it is likely that the petcock and some or all of the float valves are at fault.

1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough

www.kzrider.com/11-projects/620336-anoth...uild-thread?start=24
The following user(s) said Thank You: Nessism, MarcG

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06 Jul 2021 14:40 #851408 by d4rkmatter
Replied by d4rkmatter on topic 80 kz750h Ltd
If the carbs haven't been cleaned in a while double check the float needle seats and needles.
I had to replace all the needles as they were hard and misshapen. Then clean the valve seats with a Qtip and carb cleaner. (I've also read to use Brasso to polish them up)

Regardless, clear tube test is the way to go. You don't have to mount them on the bike to do it. They just need to be level (as if they were mounted).
 

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06 Jul 2021 14:59 #851411 by MarcG
Replied by MarcG on topic 80 kz750h Ltd
Thanks for the manual Texaskz I don’t have one carbs have been rebuilt and cleaned so a little work on the tangs to raise float height then check fuel level will hopefully solve, 2nd owner here she’s only got 7100 orig mi on her n she looks great 

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06 Jul 2021 15:01 #851412 by MarcG
Replied by MarcG on topic 80 kz750h Ltd
Thank you sir will do fingers crossed I really think it’s something simple but!

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06 Jul 2021 18:14 - 06 Jul 2021 18:15 #851422 by Mikaw
Replied by Mikaw on topic 80 kz750h Ltd

a little work on the tangs to raise float height.
Backwards. If fuel is already coming out of the overflows the float level is to high. You will need to bend tag up, this will lower fuel level. Lots of other things need to be checked. One critical is rust/dirt in the tank. Add a gravity feed inline filter. As mentioned check float needle and seat. If they are worn match size (marked on seat) of original with OEM parts. 

1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.
Last edit: 06 Jul 2021 18:15 by Mikaw.
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06 Jul 2021 18:34 #851426 by Nessism
Replied by Nessism on topic 80 kz750h Ltd
Overflow tubes could be cracked.  Extremely common on the Keihin CV34's.  I've posted a tutorial on how to fix them in an older thread.  Or use google.  Lots of Honda Keihin carbs have the same problem.
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06 Jul 2021 21:28 #851435 by ghostdive
Replied by ghostdive on topic 80 kz750h Ltd
A good rule of thumb is that the floats themselves (not the tang) should be parallel to the gasket surface - if the float needles have weak springs be sure to check the heights with the carburetors sideways, or just hold the floats up.

My manual does specify a float height for CV34s (and BS34s), I just don't have my manual handy right now.

1982 KZ750 Spectre - 6 speed swap, BS34s, 18" rear wheel

2001 ZX-6R

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10 Jul 2021 05:30 #851533 by MarcG
Replied by MarcG on topic 80 kz750h Ltd
New question the guy that worked on my carbs is telling me he thinks I’ve got peacock in wrong position. He’s says it should run in prim position, and on when not riding this makes no sense to me please settle this debate.

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10 Jul 2021 05:35 #851534 by zed1015
Replied by zed1015 on topic 80 kz750h Ltd
On a vacuum tap the prime position is for initial starting and then switch to the ON position for riding.

AIR CORRECTOR JETS FOR VM CARBS AND ETHANOL RESISTANT VITON CHOKE PLUNGER SEAL REPLACMENT FOR ALL CLASSIC AND MODERN MOTORCYCLE CARBURETTORS
kzrider.com/forum/23-for-sale/611992-air-corrector-jets-





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10 Jul 2021 08:04 #851542 by MarcG
Replied by MarcG on topic 80 kz750h Ltd
So when not in use petcock should be in what position?

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10 Jul 2021 08:47 - 10 Jul 2021 08:58 #851544 by TexasKZ
Replied by TexasKZ on topic 80 kz750h Ltd
 On or Res. Do not leave it on PRI. As ZED1015 said, PRI is only for filling the carbs after the bike has been sitting long enough for fuel to evaporate.

In a perfect world, no petcock would be needed as the needle and seat valves in the carbs are supposed to shut the fuel off when the fuel in the bowl is at the proper level. Since the needle valves sometimes leak a little and tiny specs of dirt can prevent seating, the petcock becomes the safety backup system to prevent the crankcase from filling with fuel when the bike is parked.

We are assuming that the petcock is hooked up to a vacuum source and that it is functioning as designed.

1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough

www.kzrider.com/11-projects/620336-anoth...uild-thread?start=24
Last edit: 10 Jul 2021 08:58 by TexasKZ.
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