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Post by toddmaples on May 8, 2017 18:37:16 GMT -5
Guys and gals,
Does anyone have a source for a pumper diaphram for a 23mm cvk carb? Apparantly between last summer and this my pumper diaphram has developed a leak. When carbs on bike this causes a siphoning effect and draws fuel thru the petcock at a slow rate. About 1 us gallon per four days. Gas is to expensive to evaporate away like that. Lol.
Carb is scrappys 23mm cvk "performance" carb. No manufacturer stamp/info found...
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Post by pistonguy on May 8, 2017 21:57:21 GMT -5
Call Scrappy, the Diaphragm may be the same size as a 24 or 26mm. I dunno for sure.
I have had great success with Partsforscooters answering the phone also.
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Post by toddmaples on May 9, 2017 1:42:01 GMT -5
Call Scrappy, the Diaphragm may be the same size as a 24 or 26mm. I dunno for sure. I have had great success with Partsforscooters answering the phone also. Scrappys out, and timeline is 4-6 weeks, forgot to mention that in my original post. Partsforscooters? I'll check them out, thanks. |
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Post by pistonguy on May 9, 2017 6:36:22 GMT -5
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Post by toddmaples on May 10, 2017 19:34:26 GMT -5
They're out also. Few weeks lead time as well. Has anyone ever used any of that plasti-dip stuff to repair a diaphram? Maybe flex seal or plasti-dip could seal the leak long enough to hold out until one of these places have stock... In the meantime, a manual shutoff valve will have to be the go-to. |
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Post by pistonguy on May 11, 2017 6:27:06 GMT -5
They're out also. Few weeks lead time as well. Has anyone ever used any of that plasti-dip stuff to repair a diaphram? Maybe flex seal or plasti-dip could seal the leak long enough to hold out until one of these places have stock... In the meantime, a manual shutoff valve will have to be the go-to. No I haven't had to use anything like that. At this point with you I don't think there is anything to lose other than the money it will cost for some of goop. I would recommend Permatex Ultra Blue, it is designed to work in Fuel and Oil, I don't know and don't think the Flex Seal is designed to do so, but I really don't know for sure. Good Luck |
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Post by dollartwentyfive on May 16, 2017 23:54:23 GMT -5
it all depends on how bad the hole/tear is.
if it's a tiny hole, then a drop of rubber patch glue might work for you.
i would try patching it with just glue if i could, and just enough to get a seal.
when replacing the diaphram, seat the bead in the groove, install cover, install screws but only tighten them halfway.
push up all the way on the diaphram, while holding diaphram up finish tightening the cover screws.
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Post by toddmaples on May 17, 2017 0:07:08 GMT -5
it all depends on how bad the hole/tear is. if it's a tiny hole, then a drop of rubber patch glue might work for you. i would try patching it with just glue if i could, and just enough to get a seal. when replacing the diaphram, seat the bead in the groove, install cover, install screws but only tighten them halfway. push up all the way on the diaphram, while holding diaphram up finish tightening the cover screws. Im an industrial mechanic for 12yrs, in my experience using rubber cement on vinyl and vinyl glue on rubber is a recipe for failure, so does anyone know what these things are actually made of? Rubber or some type of flexible PVC? |
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Post by dollartwentyfive on May 17, 2017 15:49:32 GMT -5
my diaphram resembled the type of rubber used in faucet washers, neoprene.
remember, air pressure makes this thing work, so whatever method you use, try NOT to add any excess weight to the diaphram.
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Post by toddmaples on May 17, 2017 15:51:42 GMT -5
my diaphram resembled the type of rubber used in faucet washers, neoprene. remember, air pressure makes this thing work, so whatever method you use, try NOT to add any excess weight to the diaphram. The accelerator pump diaphram is manually actuated when you twist the throttle. Youre thinking of the slide diaphram which uses pressure. Extra weight here wont matter much. |
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Post by chewbaca on May 18, 2017 10:48:10 GMT -5
A new valve probably cost the same as a tube of sealant
I just looked on Amazon $5.75 for a vacuum petcock
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Post by onewheeldrive on May 18, 2017 17:07:55 GMT -5
Scrappy sells an accelerator pump for the 139qmb carbs, does anyone know if they are the same pump between most of the different sized carbs? It's $4.
You are talking about repairing/replacing the accelerator pump (stem outside, plunger diaphragm inside of carb) and not the big slide diaphragm (top of carb under large cap), correct? Or, are you talking about the fuel vacuum petcock diaphragm coming directly from the fuel tank?
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Post by toddmaples on May 19, 2017 16:21:41 GMT -5
Scrappy sells an accelerator pump for the 139qmb carbs, does anyone know if they are the same pump between most of the different sized carbs? It's $4. You are talking about repairing/replacing the accelerator pump (stem outside, plunger diaphragm inside of carb) and not the big slide diaphragm (top of carb under large cap), correct? Or, are you talking about the fuel vacuum petcock diaphragm coming directly from the fuel tank? shaft/diaphram that the throttle cable actuates when twisted. I ended up ordering a $20 carb off amazon to use as a donor. Gonna put the choke and accel pump from the new carb into the old one. And fix the new one as a spare as the throat on it is 2.5mm smaller than my current one. |
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Post by dollartwentyfive on May 19, 2017 20:26:32 GMT -5
Youre thinking of the slide diaphram which uses pressure. Extra weight here wont matter much. yes, i'm talking about the main jet slide diaphram. i have to disagree with the added weight though. i'm pretty sure if you add weight to the diaphram, scooter performance will suffer. add enough weight and it won't open at all. the question is, how much is too much, especially for a temporary fix. that is something i can't answer. i've had my carb apart a few times and i didn't run across an accelerator pump. it had an air cutoff valve that eliminated backfires on closed throttle and an "enrichener" (choke). i had a 250 though. |
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Post by toddmaples on May 20, 2017 17:20:26 GMT -5
Youre thinking of the slide diaphram which uses pressure. Extra weight here wont matter much. yes, i'm talking about the main jet slide diaphram. i have to disagree with the added weight though. i'm pretty sure if you add weight to the diaphram, scooter performance will suffer. add enough weight and it won't open at all. the question is, how much is too much, especially for a temporary fix. that is something i can't answer. i've had my carb apart a few times and i didn't run across an accelerator pump. it had an air cutoff valve that eliminated backfires on closed throttle and an "enrichener" (choke). i had a 250 though. On some carbs there is a shaft behing the throttle linkage, this is the accelerator 'pump' its really just a diaphram that pulls gas from the bowl and squirts it through a small orifice when the throttle is twisted. www.scrappydogscooters.com/site/d4faf33a669343abab34a17e8762cbe3/139qmb-50cc-performanc-1?url=http%3A%2F%2Fwww.scrappydogscooters.com%2F139QMB_50cc_Performance.html#2725Look at scrappys 20mm carb, the black boot behind the throttle linkage protects the shaft, it goes through the housing and has a diaphram in the bottom where the red plug is barely visible in the pic. Take two screws loose from the botton side and it will pop right out. |
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