Why does my boat have no power?

[trista690]

We have a 1984 Bayliner Capri with a Volvo Penta Aq 125a. It runs great out of the water hooked up to a hose, but when we put it in the water it idles fine, but has no power, it bogs down. The timing has been reset and carb was cleaned. Is it the accelerater pump?

 

[RicardoMarine]

We have a 1984 Bayliner Capri with a Volvo Penta Aq 125a. It runs great out of the water hooked up to a hose, but when we put it in the water it idles fine, but has no power, it bogs down. The timing has been reset and carb was cleaned. Is it the accelerater pump?

Timing re-set as in BASE advance???
If the ignition distributor flyweights have become rusty/corroded, they may not be centrifugally advancing.
No progressive advance = no power.


When you check igntion timing, not only check BASE, but also look at the progressive and TA (total advance).

We fire up on, and we idle on BASE, and that's it.
The progressive and TA are the important aspects of this.


All markings necessary are right on the front of this engine. No digitally advancing timing light necessary.
Connect up your timing light, start engine, look at BASE advance.
Increase RPM, and see if the progressive is working.
This is very easy and simple to do.

Volvo Penta lists these specs in their OEM service manuals.



Also, if the timing belt is worn/strectched/slipped a cog, this too will cause a power loss scenario.
If you replace this belt, replace the tensioner as well.


.

 

[signusx1]

Timing re-set as in BASE advance???
If the ignition distributor flyweights have become rusty/corroded, they may not be centrifugally advancing.
No progressive advance = no power.


When you check igntion timing, not only check BASE, but also look at the progressive and TA (total advance).

We fire up on, and we idle on BASE, and that's it.
The progressive and TA are the important aspects of this.


All markings necessary are right on the front of this engine. No digitally advancing timing light necessary.
Connect up your timing light, start engine, look at BASE advance.
Increase RPM, and see if the progressive is working.
This is very easy and simple to do.

Volvo Penta lists these specs in their OEM service manuals.



Also, if the timing belt is worn/strectched/slipped a cog, this too will cause a power loss scenario.
If you replace this belt, replace the tensioner as well.


.

If your prop has to agressive of pitch it will also bog down.