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Old 04-18-2012, 04:33 PM
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GMC190 GMC190 is offline
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Speed at Idle

Last fall I purchased a new to me '87 prostar powerslot. When idling around picking up skiers docking ect.. the speed seems really fast for just an idle, like 10mph and rolling a wake. Is this normal for this boat or can something be adjusted?
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Old 04-18-2012, 04:40 PM
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thatsmrmastercraft thatsmrmastercraft is offline
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Simple as a turn of the idle speed screw. Idle speed fully warmed up should be about 800 RPM in neutral and about 600 RPM in drive (in the lake, never put your boat in gear on the trailer).

Great looking boat. Where in the Midwest are you?
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Old 04-18-2012, 04:46 PM
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Originally Posted by thatsmrmastercraft View Post
Simple as a turn of the idle speed screw. Idle speed fully warmed up should be about 800 RPM in neutral and about 600 RPM in drive (in the lake, never put your boat in gear on the trailer).

Great looking boat. Where in the Midwest are you?
How are you supposed to get it off the trailer? And what about power loading?
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Old 04-18-2012, 04:49 PM
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How are you supposed to get it off the trailer? And what about power loading?
Thank you Captain Literal. You know my caution was to not put the boat in gear while running in the driveway.
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Old 04-18-2012, 05:05 PM
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Chicago area. When in gear engine rpms are in the 600- 650 range but the actual boat speed seems fast for just being at idle
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Old 04-18-2012, 05:21 PM
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How are you supposed to get it off the trailer? And what about power loading?
I think this is what he was looking for...

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Old 04-18-2012, 06:21 PM
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thatsmrmastercraft thatsmrmastercraft is offline
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Originally Posted by GMC190 View Post
Chicago area. When in gear engine rpms are in the 600- 650 range but the actual boat speed seems fast for just being at idle
You can set the idle speed as low as you like. You will reach a point where the engine won't idle well and want to stall around 500 - 550 RPM.

Is this your first inboard? They certainly have different characteristics from outboards and I/O's.
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Old 04-18-2012, 07:01 PM
FrankSchwab FrankSchwab is offline
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If the engine's idling at the right speed, there ain't much to adjust. You'll just have to do like the rest of us, and bump into gear, and out of gear, and into gear, and out of gear, and.....
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Old 04-18-2012, 07:05 PM
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HEy GMC ...where in Chicago...do you ever go down to the Illinois River or Des Plaines to boat?

I am always on the look out for other MC owners in the area.
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Old 04-18-2012, 07:36 PM
ted shred ted shred is offline
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Take a screwdriver with you next time you go out. Once the motor is at operating temp and you are away from the dock and others, put it in forward gear and turn the idle speed screw until the tach reads 600 RPM.
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