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2004 40HP Yamaha power loss

3 stroke

New member
Have a problem with my 2004 Yahama 40hp.

Has been recently serviced and carbies cleaned, taken it back twice but still have the following issues.

It loses and gains power intermittently without warning. Will only give 1200rpm for 10 mins and then out of the blue ramp right up to correct power.

Also cranks over a lot more before starting than it used to.

A consistent fault is it cuts out halfway up the trailer when I’m driving it on. Same spot every time. No sputtering, just cuts out.

Any tips appreciated
 
Compression test on it reads ?????----------------Use a timing light to see if you can find out which cylinder cuts out , then kicks in.
 
Thanks for ideas guys, I also suspect the carbies have got muck in them again, so possibly a fuel line problem is causing crap to get through. Will try and get in there and do it myself this time. Thanks from Melbourne.
 
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