Hole in vacuum diaphragm - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 10 (permalink) Old 02-07-2011, 02:56 AM Thread Starter
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Hole in vacuum diaphragm

Well, I picked up an 1986 vn750 as a project. I just took the carbs off and started going through the Clymer's procedure on disassembly and cleaning. First thing I noticed is that I have a hole in the diaphragm on the front carb (haven't checked the rear one yet).



I don't think there's really any other options than replacing it? The question is, is there any point in continuing cleaning this carb? I checked the price of a new vacuum diaphragm, it is about as much as a used set of carbs on eBay.

Also, this is a pic of the carb body as it sits.



I was planning on using a bucket of Chemdip carb cleaner and soaking the whole thing. Is this everything I need to take off? Is there any parts I shouldn't soak (jets)?

--This is my first shot at cleaning/rebuilding ANY carbs, feel free to point out any glaring mistakes

1990 VN 750
First (hopefully last) time in the shop:
Carb rebuild New brakes front and back New radiator fan
I've done:
Spline Lube New (used - non-leaky) Gas Tank New Fork Seals New Pirelli tires New Yuasa Maintenance Free Battery
Fresh Dexcool coolant Upgraded Shunt-type R/R (Relocated) Headlight Bypass Stator tested - PASSED
Clutch Swap - EBC Street Racer Frictions with new eBayed steels ACCT to MCCT conversion
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post #2 of 10 (permalink) Old 02-07-2011, 08:47 AM
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Remove everything that will come off, including the jets. This will allow for better cleaning by the carb solution. Soak only the metal parts, no rubber or plastic. I'd let it soak overnight. Remove, rinse and be sure to blow compressed air through all the orifices, including the jets.

If you get used carbs from ebay, they may need cleaning/repair too. Have you tried looking for just the diaphram on ebay? http://motors.shop.ebay.com/i.html?_...b&_kw=diaphram

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
_____________________________________________
"Black Beauty"
1989 VN750 acquired December, 2008, 6,711 miles
Currently 23,298 miles

Old Blue
2001 Honda CMX250 Rebel acquired July, 2008

1987 VN750 project bike, acquired August, 2009, 33,000 miles and balancer sticking out of the case, currently awaiting attention and parts
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post #3 of 10 (permalink) Old 02-07-2011, 12:26 PM
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Here is a link to Crobins photo gallery with about a hundred carb pics. Should be some help to you.
https://www.vn750.com/photopost/showg...500&ppuser=962

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
Relocated R/R
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/11-vn750-general-discussion/9127-top-ten-items-you-would-suggest-new-owner-do-his-new-ride.html

Last edited by OlHossCanada; 02-07-2011 at 12:55 PM.
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post #4 of 10 (permalink) Old 02-08-2011, 01:45 AM Thread Starter
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Thanks for the feedback guys. I did check eBay for the diaphragm, no luck at the moment. Unless there's other bikes that use the same carbs? I have also looked through the carb pics in the gallery. Very helpful!

Disassembly went pretty smooth and wasn't as complicated as I thought, just gotta solve this problem, then on with the show!

1990 VN 750
First (hopefully last) time in the shop:
Carb rebuild New brakes front and back New radiator fan
I've done:
Spline Lube New (used - non-leaky) Gas Tank New Fork Seals New Pirelli tires New Yuasa Maintenance Free Battery
Fresh Dexcool coolant Upgraded Shunt-type R/R (Relocated) Headlight Bypass Stator tested - PASSED
Clutch Swap - EBC Street Racer Frictions with new eBayed steels ACCT to MCCT conversion
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post #5 of 10 (permalink) Old 02-12-2011, 04:45 PM
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Quote:
Originally Posted by kc_matt View Post
Thanks for the feedback guys. I did check eBay for the diaphragm, no luck at the moment. Unless there's other bikes that use the same carbs? I have also looked through the carb pics in the gallery. Very helpful!

Disassembly went pretty smooth and wasn't as complicated as I thought, just gotta solve this problem, then on with the show!
I just found 2 diaphrams on ebay, at the bottom of this page.
https://www.vn750.com/forum/eBay_Mark...unt&pagenum=91

Here is a link direct to one of them.
http://cgi.ebay.com/ebaymotors/KAWAS...QQcmdZViewItem

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
Relocated R/R
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/showthread.php?t=9127

Last edited by OlHossCanada; 02-12-2011 at 04:51 PM.
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post #6 of 10 (permalink) Old 02-12-2011, 05:10 PM Thread Starter
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Thanks man! RakerBill also gave me the heads up in my Sell/Swap thread. Just bought one!

1990 VN 750
First (hopefully last) time in the shop:
Carb rebuild New brakes front and back New radiator fan
I've done:
Spline Lube New (used - non-leaky) Gas Tank New Fork Seals New Pirelli tires New Yuasa Maintenance Free Battery
Fresh Dexcool coolant Upgraded Shunt-type R/R (Relocated) Headlight Bypass Stator tested - PASSED
Clutch Swap - EBC Street Racer Frictions with new eBayed steels ACCT to MCCT conversion
kc_matt is offline  
post #7 of 10 (permalink) Old 02-12-2011, 05:13 PM
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Quote:
Originally Posted by kc_matt View Post
Thanks man! RakerBill also gave me the heads up in my Sell/Swap thread. Just bought one!
Cool. Glad you found one for less than a king`s ransom.

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
Relocated R/R
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/showthread.php?t=9127
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post #8 of 10 (permalink) Old 02-12-2011, 05:16 PM Thread Starter
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Yea, now I just gotta get my head around droppin $60 on o-rings.

1990 VN 750
First (hopefully last) time in the shop:
Carb rebuild New brakes front and back New radiator fan
I've done:
Spline Lube New (used - non-leaky) Gas Tank New Fork Seals New Pirelli tires New Yuasa Maintenance Free Battery
Fresh Dexcool coolant Upgraded Shunt-type R/R (Relocated) Headlight Bypass Stator tested - PASSED
Clutch Swap - EBC Street Racer Frictions with new eBayed steels ACCT to MCCT conversion
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post #9 of 10 (permalink) Old 02-12-2011, 07:17 PM
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If there is a Tacoma screw, or Fastenal close by, go to them. They have all sorts of sizes of O-Rings, and just about any size of screws too. Whole lot cheaper.
Tacoma Screw has both SAE and Metric o-rings
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post #10 of 10 (permalink) Old 02-12-2011, 10:13 PM Thread Starter
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I've read that not all o-rings are made for use with gasoline? Or else I'd just make a run to True Value... Also there's a couple specially shaped ones that are needed.

I half-thought about just doin the job and putting it back together with the old rings, but what's the point? No way I want to wrestle those damn carbs back in just to have em leaking! They're all pretty crispy anyway, guess that's what 25 years will do.

1990 VN 750
First (hopefully last) time in the shop:
Carb rebuild New brakes front and back New radiator fan
I've done:
Spline Lube New (used - non-leaky) Gas Tank New Fork Seals New Pirelli tires New Yuasa Maintenance Free Battery
Fresh Dexcool coolant Upgraded Shunt-type R/R (Relocated) Headlight Bypass Stator tested - PASSED
Clutch Swap - EBC Street Racer Frictions with new eBayed steels ACCT to MCCT conversion
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