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The 2-Stroke Garage => General Chatter => Topic started by: 2t Fan on August 10, 2026, 11:57:21 PM

Title: Ethanol resistant oil seal and gasket manufacturers
Post by: 2t Fan on August 10, 2026, 11:57:21 PM
Since India is now adding 20% ethanol in petrol,do we have any manufacturer who makes ethanol resistant Viton, PTFE. FVMQ, FFKM oil seal, gaskets etc for our vintage motorcycles
Title: Re: Ethanol resistant oil seal and gasket manufacturers
Post by: RDnuTZ on August 11, 2026, 12:08:29 PM
we won't be using India's gas in USA so I'm not concerned. Carry on  :devil:
Title: Re: Ethanol resistant oil seal and gasket manufacturers
Post by: m in sc on August 11, 2026, 01:44:50 PM
 10% ethanol in all mine zero issues. the uk has 20% or 15% ive heard. so.. not sure. good luck.  me? have never had an ethanol issue w 10%. ever.
Title: Re: Ethanol resistant oil seal and gasket manufacturers
Post by: 1976RD400C on August 11, 2026, 07:05:22 PM
In NY you can get 91 and 93 ethanol free all over the place, but they hit up another 75-95 cents a gallon over 87  octane.
Title: Re: Ethanol resistant oil seal and gasket manufacturers
Post by: RDDave on August 11, 2026, 07:17:25 PM


I was an Evinrude outboard mechanic when the ethanol was introduced. It destroyed all of our black rubber parts that it came in contact with.

Evinrude's answer; brown Viton. I never has any problems with the brown Viton in ethanol.

.

.
Title: Re: Ethanol resistant oil seal and gasket manufacturers
Post by: m in sc on August 11, 2026, 07:45:18 PM
viton, in general, is ethanol safe
Title: Re: Ethanol resistant oil seal and gasket manufacturers
Post by: RDnuTZ on August 12, 2026, 10:16:56 AM
any thoughts on jetting changes when using Ethanol added gas vs. Ethanol Free? My only choices here in CO are 85 octane "regular" Ethanol free or 91 octane premium Ethanol free.
Title: Re: Ethanol resistant oil seal and gasket manufacturers
Post by: m in sc on August 12, 2026, 11:08:25 AM
i run a few bikes dead stock with dead stock jetting on 91 e10 zero issue
Title: Re: Ethanol resistant oil seal and gasket manufacturers
Post by: BlueR32 on August 12, 2026, 09:28:30 PM
Quote from: 2t Fan on August 10, 2026, 11:57:21 PMSince India is now adding 20% ethanol in petrol,do we have any manufacturer who makes ethanol resistant Viton, PTFE. FVMQ, FFKM oil seal, gaskets etc for our vintage motorcycles
Some years ago I bought a couple of carb gasket/o-ring kits for my 1988 FZR400 from this company in Thailand. The gaskets & o-rings were made of Viton. I don't see any older Yamaha 2-strokes listed but might be worth contacting them. They were very responsive and kits were shipped quickly.
https://www.litetek.co/ReplacementPartsYamaha.html
Title: Re: Ethanol resistant oil seal and gasket manufacturers
Post by: 2t Fan on August 13, 2026, 02:26:35 AM
Quote from: BlueR32 on August 12, 2026, 09:28:30 PM
Quote from: 2t Fan on August 10, 2026, 11:57:21 PMSince India is now adding 20% ethanol in petrol,do we have any manufacturer who makes ethanol resistant Viton, PTFE. FVMQ, FFKM oil seal, gaskets etc for our vintage motorcycles
Some years ago I bought a couple of carb gasket/o-ring kits for my 1988 FZR400 from this company in Thailand. The gaskets & o-rings were made of Viton. I don't see any older Yamaha 2-strokes listed but might be worth contacting them. They were very responsive and kits were shipped quickly.
https://www.litetek.co/ReplacementPartsYamaha.html
Thanks, will contact them

What I do is adding STA BIL additive and use bigger jets. Ethanol free 100 octane fuel is available but only major cities

Thanks all
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