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Re: Kips sub shaft o-ring
Posted: 09:57 pm May 29 2025
by Kawibunga
OK - so I finally had some time to engineer nerd out here. The drawing below has all the info and measurements I have. Use at your own risk obviously. But my plan is to modify the groove diameter as per the drawing and give it a go! I also compare used stock measurements to Fredette's oring and to the 008 Xring. My take is use the Fredette's solution, or the Xring, or keep searching for the unicorn packing. Mine will be in the machinists hands tomorrow. If any one is interested, I'm happy to share the SolidWorks files, or as STL / STEP files, and the actual PDF of this drawing. Just PM your email and I'll fire it off............ Cheers - Robert
Re: Kips sub shaft o-ring
Posted: 10:04 pm May 29 2025
by Kawibunga
- KDX Packing Info.JPG (149.72 KiB) Viewed 9393 times
Re: Kips sub shaft o-ring
Posted: 01:13 pm May 30 2025
by Chuck78
Excellent work! Thank you, sir!
Re: Kips sub shaft o-ring
Posted: 06:32 pm May 30 2025
by billie_morini
Kawibunga. that's a neat summary drawing. Thank you! Curious to hear any feedback from the machinist that will cut the groove.
Re: Kips sub shaft o-ring
Posted: 02:08 pm May 31 2025
by Kawibunga
billie_morini wrote: 06:32 pm May 30 2025
Kawibunga. that's a neat summary drawing. Thank you! Curious to hear any feedback from the machinist that will cut the groove.
The young fellow picked it up yesterday. Said it shouldn't be a problem. Their standard narrow cutter is 1/16" and the groove width is .080" so it shouldn't take any special tools. Will post how it all turns out. Just going cost me beer and chicken wings!
Re: Kips sub shaft o-ring
Posted: 02:14 pm May 31 2025
by KDXGarage
Thanks for the update!
Re: Kips sub shaft o-ring
Posted: 11:30 am Jun 02 2025
by Chuck78
Kawibunga wrote: 02:08 pm May 31 2025
billie_morini wrote: 06:32 pm May 30 2025
Kawibunga. that's a neat summary drawing. Thank you! Curious to hear any feedback from the machinist that will cut the groove.
The young fellow picked it up yesterday. Said it shouldn't be a problem. Their standard narrow cutter is 1/16" and the groove width is .080" so it shouldn't take any special tools. Will post how it all turns out. Just going cost me beer and chicken wings!
I'm going to bet that my parting tool bit (tall skinny cutoff tool steel bit for lathe use in cutting off a section from the end of a lathe turned work piece) will do nicely. I'll probably finish it off with a piece of emery cloth folded in a U-shape to deburr/polish it.
Re: Kips sub shaft o-ring
Posted: 01:49 pm Jun 30 2025
by jamiethegiraffe
Kawibunga, that technical drawing is awesome. thank you for taking the time to make it!
I just wanted to stop by and say my ebay 5x8 red silicone O ring is still holding up. I think it has about 40 hrs on it now and has seen some really high coolant temps and hard running in muddy enduros. I'm tearing the motor down due to a crank seal leak, but the Fredette-inspired economy fix is still holding back air pressure when leak tested @ 5 psi. No visible wear or marring on the O ring.
I've recently acquired a few O rings of the same size made from buna. I will probably try one of these out when i reassemble the engine, but so far the silicone seems totally adequate.
Re: Kips sub shaft o-ring
Posted: 06:51 pm Jul 01 2025
by Chuck78
Thanks for the report back, Jamie! I will be putting in one of these o-rings after Friday morning's ride when I tear my top end down for inspection, cleaning, piston ring and Gap measuring, and cylinder bore measuring...
Re: Kips sub shaft o-ring
Posted: 01:12 am Jul 02 2025
by billie_morini
jamiethegiraffe wrote: 01:49 pm Jun 30 2025
Kawibunga, that technical drawing is awesome. thank you for taking the time to make it!
I just wanted to stop by and say my ebay 5x8 red silicone O ring is still holding up. I think it has about 40 hrs on it now and has seen some really high coolant temps and hard running in muddy enduros. I'm tearing the motor down due to a crank seal leak, but the Fredette-inspired economy fix is still holding back air pressure when leak tested @ 5 psi. No visible wear or marring on the O ring.
I've recently acquired a few O rings of the same size made from buna. I will probably try one of these out when i reassemble the engine, but so far the silicone seems totally adequate.
Thank you, Jamie Giraffe. This is good news from someone that understands performance and bench testing.