Hi, I was wondering how hard it is to clean the injectors of a 4 stroke Yamaha 115.
Is it a job for professionals or could it be done at home. I am no mechanic but trying to learn how to do some tasks myself rather than having to go to a mechanic every time.
In short, could I cause lots of damage by taking them off, cleaning and putting them back on? Is there anything I should know about before doing it?
It's a specialist job; leave them alone! You can brake them as they are tighten to a specific torque, you will not be able to open them as that's for the specialist. You could clean them in a ultra-sone bath, if you have that. You need new gaskets and rings at instalment.
The only thing you can do is add special cleaning stuff (loads of them about) in your petrol, even fill your filter with the stuff and let the engine run on it. That will do the job. Period.
I just use a fuel additive/injector cleaner every now and then (when I remember.) I bought a bunch of the Yamaha stuff (Ring Free) when the boat was new; it gets a dose in the fuel every third or fourth fill-up.
They are partially blocked due to some small particals in some bad fuel. It runs fine at low revs but anything over 10knts the revs increase but there is no more power/speed.
My boat mechanic is coming on Monday to sort them out. I will watch what he does so will know what to do if there is a next time (hopefully not)
The Yamaha 115 does seem to be affected by injector problems now they are ageing. A quick fix is a session in ultrasonic cleaner filled with petrol, if not then as said before Yamaha UK will test them and refurb as necessary - I've had a few which have failed their tests and had to replace with new.
