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Cannot accelerate full speed

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Stella49er View Drop Down
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    Posted: 07/23/2014 at 10:03am
I am new to owning a pontoon as well as new to this site. We bought a used 2008 Sylvan with a 60 hspr. motor. Everything has been working fine until recently. It will no longer accelerate past half speed. You can push the throttle all the way up, but the speed does not increase. It was suggested to us it may be a loose cable on the throttle. Before hiring someone to repair it, I'd like some input from you experts so we know what to expect from a repair bill. My sis nor I have any motor experience. we just love to ride and fish. Please help us!
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fatdaddy View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote fatdaddy Quote  Post ReplyReply Direct Link To This Post Posted: 07/23/2014 at 10:26am
What are rpm at WOT...pull off cowling and work throttle and see what happens!!  Throttle cable is an easy fix even for someone who is not an outboard mechanic....I would guess it is something fairly easy to find!!
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Stella49er View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Stella49er Quote  Post ReplyReply Direct Link To This Post Posted: 07/24/2014 at 8:41am
I think the rpm's were about 40 when we had the throttle at full speed. But sometimes it would jump around. Would the cowling be the motor cover? Would this problem also make the motor suck a lot of gas? We are going though gas at a rapid rate! Your help is most appreciated.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote fatdaddy Quote  Post ReplyReply Direct Link To This Post Posted: 07/24/2014 at 9:08am
4000 rpm seems low....is the prop in good shape?....and yes cowling is motor cover, pull cover and have someone work throttle to see if it is working properly....at WOT that engine will burn close to 6 gallons of fuel per hour!! older tachs will jump around a little, not unusal..
Keith Winders
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My 1989 SYLVAN REBUILD
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Something2do Quote  Post ReplyReply Direct Link To This Post Posted: 07/27/2014 at 9:19am
Check your linkage and get a manual for the motor if you are going to try and fix the issue yourself. I had a similar issue and the problem was with the timing.
 
Depending on the motor, there are different linkages that work together to advance the timing as the throttle increases. The timing advance (trigger) is just under the flywheel and should move forward as the throttle advances.
 
Could also be a number of other things, but that is my first guess. If it suddenly happend, it might be that something broke that connects part of the linkage. The flywheel key could also have sheared.
 
Let us know what you find out.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Stella49er Quote  Post ReplyReply Direct Link To This Post Posted: 07/29/2014 at 7:33am
We checked the throttle cables and they move when the throttle is moved up and down. I guess that is not the problem. Another person on here suggested the prop might be chipped. Checked that out too and no chips. I guess we will have to bite the bullet and hire someone from the marine center.    Thanks for your help.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Stella49er Quote  Post ReplyReply Direct Link To This Post Posted: 07/29/2014 at 7:38am
Thanks for your suggestions. We were hoping for a simply fix as neither my sis nor I have any experience in motors. Checking out the linkage is way beyond our capabilities!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote RcgTexas Quote  Post ReplyReply Direct Link To This Post Posted: 07/29/2014 at 2:35pm
The prop may be your problem. Too much pitch maybe. Do you know what you are turning now? a "prop shop" may be able to loan you one to try with less pitch and see if that helps. Too much load will make your engine suck more gas.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Stella49er Quote  Post ReplyReply Direct Link To This Post Posted: 09/11/2014 at 8:24pm
Just wanted to let you know what the problem was with the acceleration. It was a coil pack that went bad. I don't know what that is, but as I understand what the mechanic told me, it's something to do with the carburetor system. It's fixed and running beautiful. Thanks for all your suggestions of help.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SunBlocker Quote  Post ReplyReply Direct Link To This Post Posted: 09/11/2014 at 9:04pm
Actually it's part of the ignition system (not carbeuration), but glad you got it fixed!
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