89 bayliner omc with 302

[Buttz]

Im having problems getting up to speed. Out of the water I can rev it up in neutral as I high as I want. But in the water and in gear I can only get up to 2300ish rpm be for it starts to bog out. The boat is 18 years old, do you think its time for a rebuild and thats why its a dog under a load? thanks

 

[DJ]

Re: 89 bayliner omc with 302

Don't do anything until you do a compression test and a leak down test. That will give you the general health of the engine.

 

[flabum]

Re: 89 bayliner omc with 302

Sounds like a fuel starvation issue. Check your filters for water or dirt, your fuel lnes for air leaks or kinks, the anti-siphon valve for obstruction and the fuel tank vent for obstruction.

 

[Haut Medoc]

Re: 89 bayliner omc with 302

Both answers are valid.....
I'd do the filters first....
That includes a look at the flame arrestor as well.... ​

 

[Bondo]

Re: 89 bayliner omc with 302

Ayuh,.......Here's your Answer,......Courtesy of Don,......

Here is a list of possible causes of low WOT. Mark them off as they are actually checked and actually do the tests and you will find your problem.

Engine Won't Reach Operating RPM. Check

• Fuel condition. Type and Octane possibly old fuel
• Propeller pitch or diameter, damaged blades
• Restricted fuel pickup tube or anti siphon valve Fuel System Test
• Crankcase oil volume, high oil level can cause aerated oil and lifter collapse
• Marine growth on hull and outdrive
• Wrong gear ratio in outdrive
• Restricted carburetor air intake (clogged flame arrestor)
• Restricted exhaust system (broken exhaust shutters/flappers) in engine transom shield or drive
• Poor cylinder compression Compression Test
• Carburetor defective, or wrong type.
• Fuel pump pressure and vacuum
• Boat overloaded, improperly loaded, or improperly trimmed.
• Engine Overheating
• Engine timing and ignition system operation
• Remote control cables and linkage for proper travel to open throttle plates fully.

 

[Buttz]

Re: 89 bayliner omc with 302

Thanks guys!! Anyone know what the compression specs should be? Or if theres a online manual? thanks again

 

[Haut Medoc]

Re: 89 bayliner omc with 302

140 would be good......​

 

[gdombroski]

Re: 89 bayliner omc with 302

First things I would do is as suggested above. Replace fuel filters and anti-siphon valve. Cheap and quick and just might resolve issue.