trying to ID a big bore kit - Parts is Parts https://www.airheads.org/community/parts-is-parts/trying-to-id-a-big-bore-kit/ Airheads Beemer Club Discussion Board en-US Mon, 20 Apr 2026 09:24:30 +0000 wpForo 60 RE: trying to ID a big bore kit https://www.airheads.org/community/parts-is-parts/trying-to-id-a-big-bore-kit/#post-12628 Wed, 10 Feb 2021 13:30:22 +0000 That looks like a stock bmw cylinder.  I believe my r100 cylinder have the same mark. Its the casting company trade mark. Let me dubble check my 3 different r100 bikes. 

]]> Parts is Parts Donald Beverage https://www.airheads.org/community/parts-is-parts/trying-to-id-a-big-bore-kit/#post-12628 trying to ID a big bore kit https://www.airheads.org/community/parts-is-parts/trying-to-id-a-big-bore-kit/#post-12626 Tue, 09 Feb 2021 23:03:08 +0000 I've acquired an early '86 R80GS motor which the unknown PO had begun to rebuild with a 1000cc big bore kit. I am trying to ID the maker of this kit. It could be Siebenrock but doesn't exactly look like the pictures on their site. It has a mark which resembles a dollar sign with the right hand vertical slash mark being 'C' shaped. See attached pic and please let me know what I've got. N

]]> Parts is Parts Hal Smith https://www.airheads.org/community/parts-is-parts/trying-to-id-a-big-bore-kit/#post-12626