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Post by scootnewb on Feb 13, 2019 15:07:19 GMT -5
I've been having some trouble with my scoot running after some crazy cold weather came though. I have a new carb arriving sometime today. I took apart the Keihin currently on there in hopes of a minor rebuild. I've never done it before. I removed the diaphragm and the main needle to check needle position and for any debris, it looked good but I can't put it back together now because the diaphragm seems to have stretched out. I didn't spray anything on it or pull it out hard etc etc. Has this happened to anyone else? Does that mean the diaphragm was bad?
Thanks
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Post by pinkscoot on Feb 13, 2019 21:03:16 GMT -5
That usually happens after they get sprayed with cleaner. I would take it all inside and let it sit and hope it goes back to normal.
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Post by lilpinny on Feb 13, 2019 21:12:17 GMT -5
You can get a new one from jetsrus.com
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Post by scootnewb on Feb 13, 2019 22:00:15 GMT -5
That usually happens after they get sprayed with cleaner. I would take it all inside and let it sit and hope it goes back to normal. IKR? I may have had some residual gasoline on my fingers. That is the only thing I can think of. |
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Post by scootnewb on Feb 13, 2019 22:00:46 GMT -5
You can get a new one from jetsrus.com Thanks, I'll most likely do that in the future. |
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Post by FrankenMech on Feb 17, 2019 14:17:18 GMT -5
Gasoline, especially gas with ethanol, can swell many rubber parts.
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Post by SMALL CC TEK on Feb 17, 2019 14:39:40 GMT -5
I put them in the ultra sonic cleaner cause it is heated i put the heat on 125 shrink them down a little and install! That is one method the other is take some rubber cement for paper . take a q tip and lay some in the groove all the way around then install the diaphragm flip the rubber down and install it in the up position . It works and i will tell you Kymco SYM Genuine all do this i have taken them all apart at times and found the same thing done in all of them . have your cap spring and screws and tools all ready so when you get it just right you close it up right away . Sometimes it takes 30 minutes to get right lol Or just order a new diaphragm ! The fuel does it most cases ethanol kills rubber parts dead ! lol
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Post by lilpinny on Feb 17, 2019 14:52:32 GMT -5
Just buy a new one.
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Post by FrankenMech on Feb 17, 2019 20:34:16 GMT -5
Most gasoline or chemical swollen parts will 'dry' out over time in a well ventilated area. Elevating the ambient temperature will speed the process. Some chemicals like ethanol will swell the rubber so severely that microscopic surface cracks will form. The rubber can spall away as very small sugar cube shaped pieces and the cracking can continue on through the material. This type of chemical attack is deadly on carb, petcock, and pump diaphragms, seals, gaskets, O-rings, fuel lines, and tubing.
Many Asian rubber parts are susceptible to attack by our fuel that contains ethanol because unlike Americans they are not so stupid as to mix gasoline and ethanol. Gas and ethanol are incompatible when mixed in anything but very low concentrations. Many materials are incompatible with each other and the containers and seals used, like oil in brake fluid.
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