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Yamaha F70 Intermittent High Idle

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9.9K views 13 replies 6 participants last post by  matthew9778  
D
#1 ·
Was fishing a new area out of state recently and nailed a couple of firm sandbars at 25-30mph inside the "channel". Everything seemed fine after that but noticed that sometimes now it'll rev up to 12-1400 rpm when shifted into neutral.

It's perfectly normal 80% of the time, and it happens seemingly more at the end of the day and never at the beginning.

Could I have knocked something loose in the impact? Any ideas before I take it to the shop? Thanks
 
Discussion starter · #3 ·
I haven't noticed that before on mine, and I ran the old battery down when I first got the boat. I hooked it up when I got home and it was good on battery. Thanks for the suggestion though
 
Discussion starter · #6 ·
Still having trouble with this. The throttle is definitely a little sticky but what confuses me is that if I turn it off for 10-20 seconds and turn it back on, it idles normally at 700 rpm. If it runs in gear for a couple more minutes, it returns to the high idle problem.
The other day after running for an hour, I shifted into neutral and it jumped up to 2000 rpm. Turned ignition off and motor continued to run, got worried about it and pulled the kill switch. Still ran for 30ish seconds before shutting down. Turned back on a min later and idled normal at 700 rpm.
Anybody??
 
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