Re: From Yamaha's Website, Nuff Said
Re: From Yamaha's Website, Nuff Said
Just to add to the confusion
http://bbcboards.zeroforum.com/zerothread?id=99872
I spoke with a guy named Mark at Yamaha Corp. in Atlanta, GA and here is what he says is the official answer about how to properly flush a Yamaha engine.
If the engine has a flush adapter and your water source has enough pressure to cause a stream of water to discharge from the cowling drain (pee hole), then it is fine to run the engine on the flush adapter only, but it's limited to 1500 RPM max and no longer than 15 minutes. This also ensures adequate water for water pump lubrication.
If the overheat horn sounds or you cannot get enough pressure for water to flow from the cowling drain hole, you are required to use BOTH the flush adapter and a lower unit flush adapter simultaneously. Additionally, you should never start the engine out of the water until you have allowed adequate time for the engine block and lower unit to fill with water and start draining out. If water is draining out of the lower unit, it is in fact lubricating the water pump.
Please don't assume that I'm trying to tell you how to maintain your engine, just merely trying to alleviate all the ambiguity surrounding this issue. I shared with him that their technical data (Owners Manual) is inconsistent, but he had no response. I hope this helps