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Richard A. White
MOB Chapter President
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Re: RDE-18 powerhead to exhaust plate/gaskets
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Unread postby Richard A. White » Sun Feb 05, 2017 9:45 am
You mean open this hole up to 2 inches???
Anyone got a copy of tat service bulletin?
55 Bigtwin.jpg
55 Bigtwin.jpg (314.56 KiB) Viewed 16 times
Richard A. White
AOMCI Member
MOB Chapter President
Yes I mean that hole you marked in your picture. I would just take a 2” hole saw and use the existing 1/4” hole as the guide and make the hole 2”. Nice green paint job ! My father bought my 1955 Johnson 25 HP. brand new and although I thought it was a good running engine it never had close to the top end the 1956 30 HP. had. I thought that was just the way it was until one of my relatives mentioned to me that the engine used to be pretty fast but it seemed that over time it got slower but still ran good. What I think happened was the new design cowl when new did not seat as tight on the rubber seal as it did when everything sat together in place for a long period of time and then the engine was starved air to the carburetor when it ran wide open. Then it just ran as fast as the air it got would let it never reaching it’s full speed potential. You can see the 2” hole in the picture of the 1956 pan author posted. Bill,