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Old 17 July 2014, 06:03   #1
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Country: UK - England
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Yamaha EFI Quattro 60hp problems

Hi

My Yam 60 has suddenly lost a third of it's power, speed is down for the same revs as before, and it won't rev above 4300.

I've changed the inline fuel / water separator filter, checked the fuel filter on the engine, tanks and fuel line all seem good.

Any ideas on what I should check / do next?
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Old 17 July 2014, 06:16   #2
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Try looking at the fuel injectors, I have just recently had to replace one of mine on my Yammy F115AETL 4-stroke as it had become blocked. I noticed that my WOT revs went down and the boat was noticably slower but didn't realise what it was until it was found by the engineer during it's latest service.

I'm yet to get favourable conditions coinciding with time out on the water in order to re-check my WOT and speed again, but the boat feels a lot better since changing it.
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Old 17 July 2014, 06:35   #3
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happened to me and all that had happened was one of the ht leads had come lose on the spark plug.
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Old 17 July 2014, 10:37   #4
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Quote:
Originally Posted by Ovey View Post
Try looking at the fuel injectors, I have just recently had to replace one of mine on my Yammy F115AETL 4-stroke as it had become blocked. I noticed that my WOT revs went down and the boat was noticably slower but didn't realise what it was until it was found by the engineer during it's latest service.

I'm yet to get favourable conditions coinciding with time out on the water in order to re-check my WOT and speed again, but the boat feels a lot better since changing it.
Cheers will cheek

Quote:
Originally Posted by henryfreston View Post
happened to me and all that had happened was one of the ht leads had come lose on the spark plug.
I hope it's as simple as that!
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Old 17 July 2014, 12:42   #5
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Cracked start plug was my problem with similar symptoms.
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Old 17 July 2014, 16:03   #6
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Quote:
Originally Posted by Red Fox View Post
Cracked start plug was my problem with similar symptoms.
Start ...I mean...spark
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