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Old 09-29-2011, 12:06 AM   #21
DCChadow
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Quote:
Originally Posted by mcvierh
Good hint.

Have searched for the topic for a couple days now...but no luck.

I found several cracks in the diaphram while i was inside the carbs...looked everywhere that i can think to look....are there aftermarket replacements for the spirit 750 diaphram or is it a dealer only 108.00 each piston situation? I dont mind used ones but im not finding that either...

I can normally find my answers...but im out of places to look....
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Old 09-29-2011, 05:28 AM   #22
mcvierh
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Quote:
Originally Posted by DCChadow
Have searched for the topic for a couple days now...but no luck.

I found several cracks in the diaphram while i was inside the carbs...looked everywhere that i can think to look....are there aftermarket replacements for the spirit 750 diaphram or is it a dealer only 108.00 each piston situation? I dont mind used ones but im not finding that either...

I can normally find my answers...but im out of places to look....
This is from the Wolfs bike shop:
Motorcycle carburetor diaphragms become torn, dry, cracked, delaminated, hard, and or brittle over time. All of these signs are bad and deem replacement. The diaphragm's function is to act as a bladder when velocity in the carbs venturi increases. This pressure differentiation lifts the diaphragm against the spring and hence the slide. If the diaphragm has any holes, cracks, splits, etc. then the pressure will leak past the diaphragm and not raise the slide at the correct rate or at all in some cases. Also delamination is a sure sign that more damage is surely on the way.
As for my solution for this problem of holes in diaphragms I think I may have a cure for this common problem. First, disassemble the diaphragm from the slide as far down as possible. Second, go to your local NAPA parts store and purchase a can of spray rubber coating. Third, paint your diaphram with the rubber coating with a thin coat on both sides, allowing to dry over night.
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Old 09-29-2011, 10:54 AM   #23
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K...thank you for your response Mc V. I have tried to coat over the cracks with a dab of butyl rubber type polyurethane glass sealant for now...but the spray is a plus brilliant idea because it will coat the entire diaphram....and surely once the cracking has started it will spread....

all boils down to picking up a dead horse and riding it for 100 more miles i suppose.

I will post the results of this attempt.... If it works ....it will be a lot cheaper than buying new pistons at 108.00 each.
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Old 09-29-2011, 11:41 AM   #24
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You can probably buy a set of stock carbs for $100....
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Old 09-29-2011, 11:44 AM   #25
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Stock carbs AND a factory pro jet kit.

http://www.shadowriders.net/forums/s...ad.php?t=23037
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Old 09-30-2011, 02:09 AM   #26
DCChadow
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Quote:
Originally Posted by pyrplhaze
Stock carbs AND a factory pro jet kit.

http://www.shadowriders.net/forums/s...ad.php?t=23037
Carbs AND the kit for 100.00....i may be interested...will send pm....
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Old 10-07-2011, 01:02 PM   #27
DCChadow
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Well...ive put a couple hundred miles on the makeshift repair and it seems to run exceptionally well...i havnt opened the carbs back up yet to see if the patches are still intact but it hasnt acted out in a negative manner...
One seemingly obvious thing that may be worth mentioning is:

The thinner you can make the patch...(or layer of rubber if using the spray) the better. So the repair doesnt affect the movement capabilities of the diaphram slide. The rubber will get thicker and in turn movement may be restricted by the change. Just a thought.

Hopefully the carbs i just bought from purplehaze will have good slide diaphrams anf i can just switch them out....
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Old 04-17-2013, 08:53 AM   #28
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Just curious but if they are hanging up even just a little will the bike not start. I cant start a new thread as im new but have a feeling this has to do with my problem
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Old 04-17-2013, 03:23 PM   #29
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Quote:
Originally Posted by stevo7181
Just curious but if they are hanging up even just a little will the bike not start. I cant start a new thread as im new but have a feeling this has to do with my problem
No. Torn diaphragms don't have a thing to do with starting. In fact you can still ride with trashed diaphragms you'll just have really shitty throttle response and usually run real rich.
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