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Foozle
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« on: October 01, 2010, 01:23:40 PM » |
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Guys (and Gals): In the process of changing out the needles in my carbs, I found one of the rubber vacuum pistons had a hole worn near the upper edge where the stealer incorrectly reinstalled the carb cover over it (it's been a couple of years - so this is water under the bridge). The vacuum piston is the umbrella-shaped rubber membrane that houses the needle-holder, carb spring, etc.
The cheapest price I can find for this item (which includes the slide) is $72.04 at HDL - which is highway robbery considering the part. Is this something that could viably be repaired with silicone (or some other sealant) - or am I just asking for trouble? Does anyone have any experience with this problem? FYI -this is part #16111-MZ0-A00. In advance, thanks much. Terry
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98valk
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« Reply #1 on: October 01, 2010, 02:05:12 PM » |
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depends how big the hole is for sealing.
but I would try Permatex® Form-A-Gasket® No. 2 Sealant
Slow-drying, non-hardening sealant designed for sealing cut gaskets and stamped parts. Allows for easy disassembly if required. Temperature range -65°F to 400°F (-54°C to 204°C); resists common shop fluids and fuels. Use where sealing is more important than adhesion.
they have a #1 with the same name, it will harden. better than $72.
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1998 Std/Tourer, 2007 DR200SE, 1981 CB900C 10speed
1973 Duster 340 4-speed rare A/C, 2001 F250 4x4 7.3L, 6sp
"Our Constitution was made only for a Moral and Religious people. It is wholly inadequate to the goverment of any other."
John Adams 10/11/1798
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Ricky-D
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« Reply #2 on: October 01, 2010, 02:36:34 PM » |
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The vacuum is not high so the strain on the material is slight.
Rather than trying to fill the hole with some kind of sealer I suggest getting a rubber glove like the kind you use to wash dishes with and cut a small patch out from the glove and glue it with some flexible adhesive.
Loctite makes a good flexible adhesive that is good on vinyl, fabric and plastic. You can find it at WalMart.
Glue it on the concave side of the diaphragm.
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2000_Valkyrie_Interstate
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Foozle
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« Reply #3 on: October 01, 2010, 05:07:19 PM » |
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depends how big the hole is for sealing.
but I would try Permatex® Form-A-Gasket® No. 2 Sealant
Slow-drying, non-hardening sealant designed for sealing cut gaskets and stamped parts. Allows for easy disassembly if required. Temperature range -65°F to 400°F (-54°C to 204°C); resists common shop fluids and fuels. Use where sealing is more important than adhesion.
they have a #1 with the same name, it will harden. better than $72.
It's a fairly small hole - so I went ahead and coated it evenly on both sides of the diaphram with Permatex® #2 Sealant (which I always have on hand). I'll let it sit overnight and install it tomorrow. I'll let everyone know how it works out. I'm keeping my fingers crossed! Thanks for the input, guys! It's much appreciated. |
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sandy
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« Reply #4 on: October 01, 2010, 05:38:13 PM » |
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My local shop had some valk carbs in and out and couldn't make it run right. Close inspection showed all of the diaphragms had tiny hairline cracks from extended dry storage. Owner wasn't happy needing 6 of those buggers. Ran like a champ after that.
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GOOSE
Member
Posts: 704
D.S. #: 1643
Southwest Virginia
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« Reply #5 on: October 01, 2010, 09:42:37 PM » |
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i hope that the permatex fix works for you, but i would doubt that it will. you would be better off just biting the bullet, and buying a new one. permatex might work just fine, .......and then again it might just leave you by the side of the road
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Ricky-D
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« Reply #6 on: October 02, 2010, 09:02:24 AM » |
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i hope that the permatex fix works for you, but i would doubt that it will. you would be better off just biting the bullet, and buying a new one. permatex might work just fine, .......and then again it might just leave you by the side of the road
I don't think from just one carburetor problem and the problem is not something that will shut the carburetor down completely. Not trying to criticize your post and I know there are some that will send for a trailer at the first sign of any kind of problem, again, not saying you would, but there are some! *** |
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2000_Valkyrie_Interstate
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Madmike
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« Reply #7 on: October 03, 2010, 10:03:41 PM » |
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I am real interested in hearing how this works out for you, please be sure to post the results whichever way it turns out - even if it turns out to work on a temporary basis. I work in the Arctic and so parts availability issues are always a problem here. Lots of people travel with spare pistons etc. when they leave town for any period of time and there are some real innovative folks when it comes to "roadside repairs".
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Foozle
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« Reply #8 on: October 04, 2010, 05:29:17 AM » |
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I am real interested in hearing how this works out for you, please be sure to post the results whichever way it turns out - even if it turns out to work on a temporary basis. I work in the Arctic and so parts availability issues are always a problem here. Lots of people travel with spare pistons etc. when they leave town for any period of time and there are some real innovative folks when it comes to "roadside repairs".
Will do. I'm out of town this week, but will check the "fix" after I run a tankful of gas through the Valk when I return. Thus far, the bike runs very well except for "wavering" a little at idle - which I expect (hope!) to remedy with a carb sync. Terry |
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Mr.BubblesVRCCDS0008
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« Reply #9 on: October 04, 2010, 07:45:55 AM » |
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I had a yamaha with a very small hole in the rubber that I repaired with alittle RTV sealer. The hole was right at the edge so it didn't have to move much. It was still working when I sold the bike several years later.
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Foozle
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« Reply #10 on: October 11, 2010, 05:08:31 PM » |
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Well, it didn't even take me an entire tankfull of gas to realize my "fix" using Permatex #2 to seal the hole in one of my carburetor vaccum pistons wasn't going to work. I removed the carb cover this evening after a short ride (the bike ran horribly), and found the hole in the rubber diaphram had re-opened and the sealant was a gooey mess. It's possible the hole was simply too large - or in a particularly bad spot - so I won't completely rule this out as a viable (or perhaps temporary) solution under other circumstances. Unfortunately for me, I'm now forced to drop ~$70 for a new vaccum piston. (Or, for another $150 or so, I suppose I could just buy an entire used carb bank to keep around for parts - but with no guarantee any of the vacuum pistons would even be useable). Man, I hate spending $$ for non-bling. Oh, well - a lesson learned. Terry
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Ricky-D
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« Reply #11 on: October 12, 2010, 07:51:12 AM » |
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It might be that a patch will still work.
I wouldn't just dismiss the possibility out of hand.
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2000_Valkyrie_Interstate
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Foozle
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« Reply #12 on: October 12, 2010, 08:14:19 AM » |
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It might be that a patch will still work.
I wouldn't just dismiss the possibility out of hand.
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No, I'm not; some type of patch remains a reasonable solution. In this case, however, my main concern is that the location of the hole (near the outer edge of the rubber diaphram) makes it difficult to get enouch surface area onto which to secure an airtight patch. If the blemish were more toward the center of the piston, I would absolutely give this a try. I still may; we'll see. Terry |
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98valk
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« Reply #13 on: October 12, 2010, 11:03:41 AM » |
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u could try rubber cement. used it on a hole that was in a woofer of a stereo speaker. worked like a charm for many yrs.
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1998 Std/Tourer, 2007 DR200SE, 1981 CB900C 10speed
1973 Duster 340 4-speed rare A/C, 2001 F250 4x4 7.3L, 6sp
"Our Constitution was made only for a Moral and Religious people. It is wholly inadequate to the goverment of any other."
John Adams 10/11/1798
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