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Old 02-19-2014, 04:59 PM   #1
Shooter1 OP
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Mik BST40 on Lc4, o-ring question

I instaled a BST 40 on my '98 RXCe620 over the weekend and it puked gas out the overflow tube. When inspecting the needle and seat, the seat is inside a brass barrel that has a rubber o-ring around it and press fits into the carb body, with the o-ring creating a seal. This barrell/seat would fall out in your hand after you removed the float assembly and turned the cab right sied up. I concluded the rubber o-ring had compressed/shrunk over the years of the carb being not in use. I wrapped some teflon tape around the oring and pushed it back in place and it was snug and now the needle seats and seals up properly. I put the carb on the bike and it doesn't leak anymore and it runs real well but I know I need to get the PTFE tape out of the carb.

Thsi is a long winded way of saying I need to replace the rubber o-ring on the seat barrel. I checked a few places on line and can buy the seat for about $47 but can't buy just the o-ring. I can get all kinds of o-rings locally but they are for plumbing use. Chances are they would work fine but I though I'd ask what others have done if they had to replace this o-ring. I've got another spare BST parts carb and I have some new o-rings that are to be used on an o-ring chain that are almost perfect. I may wind up using them unless someone can suggest a better option.

Thanks for any replies.
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Old 02-19-2014, 05:58 PM   #2
wrk2surf
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Motolab has parts for the BST
http://advrider.com/forums/showthread.php?t=528038
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Old 02-19-2014, 09:42 PM   #3
gunnerbuck
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Quote:
Originally Posted by Shooter1 View Post
I instaled a BST 40 on my '98 RXCe620 over the weekend and it puked gas out the overflow tube. When inspecting the needle and seat, the seat is inside a brass barrel that has a rubber o-ring around it and press fits into the carb body, with the o-ring creating a seal. This barrell/seat would fall out in your hand after you removed the float assembly and turned the cab right sied up. I concluded the rubber o-ring had compressed/shrunk over the years of the carb being not in use. I wrapped some teflon tape around the oring and pushed it back in place and it was snug and now the needle seats and seals up properly. I put the carb on the bike and it doesn't leak anymore and it runs real well but I know I need to get the PTFE tape out of the carb.

Thsi is a long winded way of saying I need to replace the rubber o-ring on the seat barrel. I checked a few places on line and can buy the seat for about $47 but can't buy just the o-ring. I can get all kinds of o-rings locally but they are for plumbing use. Chances are they would work fine but I though I'd ask what others have done if they had to replace this o-ring. I've got another spare BST parts carb and I have some new o-rings that are to be used on an o-ring chain that are almost perfect. I may wind up using them unless someone can suggest a better option.

Thanks for any replies.
If those chain o-rings are the right size they will work...I use regular o-rings out of my bulk kits without issue...
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Old 02-20-2014, 03:39 AM   #4
Shooter1 OP
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Thanks guys for the replies. I've bookmarked the Moto-lab data for future use. I think I'll use the chain o-rings as they work well for the intended purpose.
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Old 02-20-2014, 08:12 AM   #5
Kawidad
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Found a green fuel resistant o ring from a Harbor Freight kit that worked. It was uber tight, but it worked. I got nervous and replaced it with a real one from MotoLab when I completely overhauled the carb.
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