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Author Topic:   150 Sport Trolling Speed
George McR posted 01-05-2005 04:07 PM ET (US)   Profile for George McR   Send Email to George McR  
My speed on idle is 4mph which is a bit too fast for some of my trolling (2003 150 Sport with 60hp 4 stroke).

Is it OK to adjust the idle speed down or am I asking for trouble with later maintenance on my motor?

Moe posted 01-05-2005 04:17 PM ET (US)     Profile for Moe  Send Email to Moe     
What's your RPM at that speed? I have the service manual at home and will look up the proper rpm and adjustment point for you tonight. That sounds a little high... ours is 2.5 mph with the 13" or 15" prop at 775 rpm.


Moe posted 01-05-2005 09:37 PM ET (US)     Profile for Moe  Send Email to Moe     
The idle speed spec, both for in neutral and in gear, is 725 +/- 25 rpm. You need an accurate shop tachometer to measure this... boat tachs aren't that accurate, especially at lower rpms. Mine reads 775 at idle.

The idle speed is determined by the Electronic Control Module (ECM) activating the Idle Air Control (IAC).

The IAC is an electrically operated spring-loaded solenoid valve, which controls the amount of intake air that bypasses the closed throttle shutter. Signals from the ECM regulate the duty cycle that the IAC remains open, or (spring loaded) closed. Duty-cycle of the IAC varies from 0-100%. The IAC controls three operating functions:

1. Provides additional intake air (bypass) for engine start-up and allows increased idle rpm during engine warm-up.

2. Controls idle speed according to varying engine loads and running conditions.

3. Functions as an electronic dashpot by providing additional bypass air as the throttle is quickly closed during a rapid deceleration, preventing engine stalling.
[end quote]

The only other thing you can check is to make sure the throttle arm on the throttle body is fully against the idle stop when the throttle is at idle or in neutral. This is on the port side of the motor toward the front.

Hope this helps,

Moe posted 01-05-2005 09:39 PM ET (US)     Profile for Moe  Send Email to Moe     
When I said, "The idle speed is determined by the Electronic Control Module (ECM) activating the Idle Air Control (IAC)" I forgot to add that the idle speed isn't adjustable. Only the computer can do that.


where2 posted 01-05-2005 09:54 PM ET (US)     Profile for where2  Send Email to where2     
Time to drag a couple of small sea anchors (like a parachute for use in the water). Alternatively, a couple 5 gallon buckets in tow would slow you down... (those new hulls are just so slippery...)

I take no responsibility for your fish getting hung up in the sea anchors, or buckets...

You could add one of those trolling brakes that mounts on the cavitation plate and blocks the prop thrust, but where's the fun in that?

George McR posted 01-06-2005 05:08 PM ET (US)     Profile for George McR  Send Email to George McR     
Thanks Moe, I will get the idle revs checked - failing all else I guess it's a sea anchor but that's not an ideal solution.
baybug posted 01-11-2005 08:08 PM ET (US)     Profile for baybug  Send Email to baybug     

A sea anchor works just fine. I, and many, many others spend hours trolling for walleye on Lake Erie each year at speads of .5mph - 3mph. The proper set up is to tie the bag off of the front cleat of the boat and let it drag under the boat only letting out enough line to keep it in the water - about 5-6ft. It will slow you down big time and allow you keep your RPMs up at a lower speed. If your not running a kicker, I highly recomend this.
Amishoutfitters buggybag is the only one really built for this application.

George McR posted 01-12-2005 05:11 PM ET (US)     Profile for George McR  Send Email to George McR     
Thanks BayBug, I had never really thought of a sea anchor as a viable proposition but I will check it out.

Regards, George

high sierra posted 01-18-2005 07:27 PM ET (US)     Profile for high sierra  Send Email to high sierra     
Baybug, I never thought of putting a sea anchor forward under the hull. Great suggestion. I'm going to try it next trip. High Sierra
Rich M posted 01-23-2005 12:01 AM ET (US)     Profile for Rich M  Send Email to Rich M     
Baybug - do you have any chaffing problems with that rig? I considered running my sea anchor that way but was advised by the manufacturer (Boat Brakes) not to. It then seemed logical to me that having rope and nylon under load and rubbing against the gelcoat for what would amount to hundreds (and eventual thousands) of hours would eventually cause damage.

I too was worried about fouling lines running it astern but it has yet to occur. The Boat Brakes style has a trip line attached to the inside center of the chute that makes for a quick and easy retrieval as well as allowing for drag adjustment by partially collapsing the chute. I run it close to the boat so it can be brought in single handed even while fighting a fish.

baybug posted 01-24-2005 08:27 PM ET (US)     Profile for baybug  Send Email to baybug     
After two seasons, I haven't seen any signs of wear or chaffing. After it opens, it just locks in with a sold pull and really no movement. I also run a trip line and tie it off forwad of the bag.

There are a ton of guys around here that us this set up.

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