GL1000 Carb Button Design

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cfairweather
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Re: GL1000 Carb Button Design

#61

Post by cfairweather »

I have been fine tuning the size of the button and can now press one into a cap; however, I may make some more adjustments. You might be interested in knowing, this is a "trial and error" process to get to the correct size, because acetal shrinks as it cools. For example, the mold hole diameter at the top edge is currently 26.78mm, but the button shrinks to 25.50mm and this is the maximum size without cutting the rim. It is a very tight fit, but it will slip under the lip when it fully seats. I may make it just a bit smaller to make it easier to press it in.

One of these were pressed in cold and one was pressed in warm, and yes, it is easier when they are warm. I have removed a couple and they get stuck in there pretty good without any glue, but glue will be recommended.
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Fred Camper
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Re: GL1000 Carb Button Design

#62

Post by Fred Camper »

Seems like one size will fit all then. Good news that there is a tight fit without glue. Should be a solid replacement.
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rcmatt007
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Re: GL1000 Carb Button Design

#63

Post by rcmatt007 »

the '75 carb tops and slides will go out tomorrow (PO closed today). As you will see these carbs (and bike) must have sat out in the weather for a long while before parting it out. I got the carbs off fleabay about a decade ago. Took I will to get two of the slides unstuck. Cannot move the butterflies (yet) and rust was in the bottom of the bowls.

So perfect for trying them out, as I am not sure the carbs are rebuildable (although I haven't given up)
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cfairweather
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Re: GL1000 Carb Button Design

#64

Post by cfairweather »

I have rebuilt a lot of carbs in the condition you describe. If you put them in an ultrasonic cleaner at 70 degrees centigrade, it will help loosen things up.
cfairweather
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Re: GL1000 Carb Button Design

#65

Post by cfairweather »

Yes Fred, one size should fit all, so I am only going to have one version of this button. It has been a real challenge to make this item because it is small and precise. I am getting very close to my final mold. I am also working on a new sealing ring that will fit around the button and also on the bottom edge. The angle of the seal will match the angle of the button edge. It will be a very small, custom ring. I have already made a few with my 3D filament printer, but I will make the final version of this item with my high quality resin printer. The button will basically fit into a rubber pocket with a small amount of glue. Glue will not adhere to the acetal but it will help seal the hole and keep things in place.
low-side
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Re: GL1000 Carb Button Design

#66

Post by low-side »

I just bought a set of these from you on eBay. They look great. Thanks!
cfairweather
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Re: GL1000 Carb Button Design

#67

Post by cfairweather »

Glad you like them and please let me know if you need help getting them installed. Thank you for buying them.
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