Winnipesaukee Forum - View Single Post - Engine suddenly stops and starts at full speed

DennisfromDanbury · 05-21-2019, 11:19 AM

I have a 19 year old Grady White 208 Adventure with a two stroke 200 HP Yamaha outboard engine. It has been well-maintained over the years, most recently receiving new plugs, fuel filter, etc. prior to the start of this season.

The engine idles well, and runs very well on smooth water, even at full throttle and 30-40 mph. However, when going over large wakes, or even more so in 1-2 foot waves, the engine will instantly stop and just as suddenly start up again after a second or so. It is exactly like a person suddenly pulls back the throttle and then instantly pushes it forward again. Very dangerous.

If I keep going at that speed, the boat will run for five seconds to one minute before it happens again.

With 1-2 foot waves, I can run at low speed (e.g., 5-10 mph). The problem is still there but happens much less frequently, probably only one tenth as frequently. So I can carefully crawl back to the dock when this happens .

Does anyone have any suggestions? Thanks!

05-21-2019, 11:19 AM	#1
DennisfromDanbury Junior Member Join Date: May 2019 Posts: 3 Thanks: 7 Thanked 0 Times in 0 Posts	Engine suddenly stops and starts at full speed I have a 19 year old Grady White 208 Adventure with a two stroke 200 HP Yamaha outboard engine. It has been well-maintained over the years, most recently receiving new plugs, fuel filter, etc. prior to the start of this season. The engine idles well, and runs very well on smooth water, even at full throttle and 30-40 mph. However, when going over large wakes, or even more so in 1-2 foot waves, the engine will instantly stop and just as suddenly start up again after a second or so. It is exactly like a person suddenly pulls back the throttle and then instantly pushes it forward again. Very dangerous. If I keep going at that speed, the boat will run for five seconds to one minute before it happens again. With 1-2 foot waves, I can run at low speed (e.g., 5-10 mph). The problem is still there but happens much less frequently, probably only one tenth as frequently. So I can carefully crawl back to the dock when this happens . Does anyone have any suggestions? Thanks!