See full version: Yamaha 225 4 stroke fuel problem
I had a fuel problem with my 03 f225 would only stay running if you pumped the bulb,stop and it would die. Ended up being the secondary fuel pump. turn the key to on position and see if you can here it run, it will only run for a second or two. This is an expensive guess.
Re: Yamaha 225 4 stroke fuel problem
Re: Yamaha 225 4 stroke fuel problem
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Re: Yamaha 25 HP 4 stroke problem
Re: Yamaha 25 HP 4 stroke problem
Re: Yamaha 25 HP 4 stroke problem [links]
How do Yamaha outboard engines work?
When these types of engine run, there is a compression stroke, a return stroke, an exhaust stroke, and then another return stroke.
This type of boat motor works with a compression stroke and an explosion stroke. The explosion stroke is powered by the fuel that was just compressed. For each revolution, there are twice as many strokes. [links]
Sorry to dispute what rubs says but no that is not completely normal for any 2stroke no matter what the age is, the problem that the engine has is almost certainly carbs which need a good proper cleaning
www.orcamarine.co.uk
February 2009
First thing you should do is check that you are starting the engine properly the yamahas are extremely good engines and when running correctly never ever need engine starting fluid this will wear your engine quickly and cover any possible early warning problems(the reason for excess wear is that starting fluid has no oil in it)the correct staring proceedure is pull out choke raise the revs on tiller/control box squeeze primer bulb until hard pull it over it should start in under 4 pulls(make sure you really pull it hard and fast)if the engine is not starting easily check that the idle mixture screw is out 1.5 turns from lightly seated position if it still has a problem you probably have a slight problem in your idle circuit of the carb. [links]