Do I need new Diaphragms?

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Do I need new Diaphragms?

01 Jun 2011 02:28
#454693
The bike is running good. Idling good, and moves pretty good too.

When I disassembled the carbs...the diaphragms were stretched and curled. I was able to clean them off, and lay them in properly and button them back up.

If there are no holes or tears, do I really need to replace the diaphragms?
Will it give better power with new ones?

Thanks in advance...first bike with the cv style carbs.
24 hours in a day...24 beers in a case

1981 KZ550 ***SOLD***
1982 KZ1100 A2

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  • JR
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Re: Do I need new Diaphragms?

01 Jun 2011 08:57
#454715
As long as there are no holes and they fit then you should be good
1980 kz750E1, Delkevic exhaust

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Re: Do I need new Diaphragms?

01 Jun 2011 09:04
#454717
I guess they can dry out and shrink get stiff etc. Like JR said, first clue is if they fit. Soft, and no holes. If they are stiff it would affect the way they get lifted by vacuum signal. Always make sure they are indexed correctly. You probably saw the small ear on one side that has a notch to go into. This puts the signal hole on the bottom, facing the front/ motor side.
These big motors haul some but don't they? :P
1982 KZ1000LTD K2 Vance & Hines 4-1 ACCEL COILS Added Vetter fairing & Bags. FOX Racing rear Shocks, Braced Swing-arm, Fork Brace, Progressive Fork Springs RT Gold Emulators, APE Valve Springs, 1166 Big Bore kit, RS34's, GPZ cams.
1980 KZ550LTD C1 Stock SOLD Miss it
1979 MAZDA RX7 in the works, 13B...

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Re: Do I need new Diaphragms?

01 Jun 2011 09:59
#454727
There are no holes or tears, but they are a bit....well, stretched out. They were almost too big for the carb.

What happens if the ear is not in the right spot? (if they are rotated)?
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1981 KZ550 ***SOLD***
1982 KZ1100 A2

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Re: Do I need new Diaphragms?

01 Jun 2011 10:04
#454730
The hole on the bottom of the slide valve must face forward towards engine side. If not the signal will be less to lift it, being lean and most likely a hesitation.
1982 KZ1000LTD K2 Vance & Hines 4-1 ACCEL COILS Added Vetter fairing & Bags. FOX Racing rear Shocks, Braced Swing-arm, Fork Brace, Progressive Fork Springs RT Gold Emulators, APE Valve Springs, 1166 Big Bore kit, RS34's, GPZ cams.
1980 KZ550LTD C1 Stock SOLD Miss it
1979 MAZDA RX7 in the works, 13B...

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Re: Do I need new Diaphragms?

01 Jun 2011 10:06 - 01 Jun 2011 10:20
#454732
Okay, I have to double check how they are oriented.

You are correct...these big fours are quick! Not as fast as a modern 1000 rocket, but not bad at all.
24 hours in a day...24 beers in a case

1981 KZ550 ***SOLD***
1982 KZ1100 A2
Last edit: 01 Jun 2011 10:20 by shizzomynizzo.

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Re: Do I need new Diaphragms?

01 Jun 2011 10:53
#454737
shizzomynizzo wrote:
When I disassembled the carbs...the diaphragms were stretched and curled. .

Like this?
[IMG


Thats what mine looked like, seem to work fine.
81 KZ650 CSR
77 KZ650B (not in my paws yet)
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Re: Do I need new Diaphragms?

01 Jun 2011 20:12
#454840
looks perfectly normal to me
1980 kz750E1, Delkevic exhaust

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Re: Do I need new Diaphragms?

01 Jun 2011 20:36
#454844
X2 on being normal. I use greese to hold them when I install them. Roy
1979 LTD Street Fighter.1977 KZ1000

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Re: Do I need new Diaphragms?

01 Jun 2011 23:03
#454874
The edges are so stretched out on mine that I am not sure I can get them to "seat" as nice as yours. Almost as if they were too big.

The edges themselves were curling inward too.
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1981 KZ550 ***SOLD***
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Re: Do I need new Diaphragms?

01 Jun 2011 23:22
#454878
Roy's tip about using a dab of grease is a great one. If you can get them seated and fit in the groove the top will hold them down.
Fit is important :)
1980 kz750E1, Delkevic exhaust

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Re: Do I need new Diaphragms?

01 Jun 2011 23:27
#454882
Yeah, looks like I am removing them again an giving it a once over again.

Thanks everyone!
24 hours in a day...24 beers in a case

1981 KZ550 ***SOLD***
1982 KZ1100 A2

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