Yamaha 4 stoke F-50
SOURCE: tachometer needle does not move after the engine is running
sounds like a bad connection on the outboard or the gauge
SOURCE: yamaha 4 stoke runs good up to half throttle. runs 7000 rpms
This can be caused by a multitude of things. Firstly you will need a manual. I do not seem to have a freebie available but you can have a look, maybe one of them will do the job. http://www.carlsalter.com/motorcycle-manuals.asp .
I would start with making sure the air- cleaners were functioning correctly, if in doubt, change them. Your problem sounds more like a choking one. Cleaning the carbs could be a good idea anyway, but you have to know what you are doing, and it is always good to put a new gasket kit in when re-assembling.
Check to make sure the alternator cable is attached.
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