Boat Maintenance: WaveVenture hard to crank

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	Name:	houseboat -
	Subject:	WaveVenture hard to crank
	Date:	7/8/2011 8:38:32 AM

We have a "95" Yamaha WaveVenture, 2 cyl. 80 hp, that has always been hard to crank. We put the choke in different places and eventually it cranks if the battery is hot enough. We have a WaveRunner GP with the same engine and it cranks up fast.
I am pretty sure that only 87 octane gas has been used lately but I remember that the first few years we ran 89 octane.
I wonder if we need to run 93 octane in it. We had to use starting fluid and a jump box to crank it last weekend.
Anybody else had this problem? I plan to replace the plugs and filters before we take it on our vacation next weekend. Anything else?
Houseboat