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| Merc 50 4cyl 4 stroke '99 |
| Author |
Message |
    
ruben stubby
Visitor
| | Posted on Tuesday, June 10, 2008 - 07:44 am: | 
|
can't get any power/speed out of motor when under a load. changed all fuel lines, spark plugs, fresh gas. in nuteral revs up 6k on tach, but when running only about 3k on tach. |
Benjamin Jones
Member
Username: benjamin_jones
Post Number: 23
Registered: 04-2008
| | Posted on Tuesday, June 10, 2008 - 09:29 am: |
|
Hi there!
Please never tell us that you rev to that level under no load, you'll lose a motor faster than you can say "gone!"...
Does the motor run well on the water? Labouring?
When was last lube service?
Has the boat run correctly before this gripe?
I ask because there are many potential problems...
1) Incorrect pitch of prop, too coarse for the hull design. If so, come down by an inch or three.
2) How's the compression? When under load, compression must be good, otherwise no pull.
3) Timing could be out, not advancing under load.
4) Is motor trimmed correctly? I've seem a motor labour because of this...
Hope this helps!
From a wintery Johannesburg in South Africa,
Regards!
Benjamin. |
ruben stubby
Visitor
| | Posted on Tuesday, June 10, 2008 - 11:03 am: |
|
The motor labours under a load. Was last lube this spring. The motor is on a pontoon boat, its a outboard. problem seems to have start late last summer. |
Benjamin Jones
Member
Username: benjamin_jones
Post Number: 31
Registered: 04-2008
| | Posted on Wednesday, June 11, 2008 - 02:18 am: |
|
Hi there,
Sorry buddy, I'm out of suggestions now...
Maybe the veterans here could assist?
Best of luck!
Regards from a chilly Jozi!
Benjamin. |
ruben stubby
Visitor
| | Posted on Wednesday, June 11, 2008 - 04:31 am: |
|
Thanks for your suggestions, I will look into the ones you suggested. Ruben Stubby |
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