92 searay wont rev

[hotrod77]

Hello, I have a 1992 searay 170 with a mercruiser 4.3. last weekend we took it out to get something to eat< it ran fine for the 1 hour trip there< but after letting it sit for 30 minutes we fired it back up and took off when we tried to do so the boat stumbled and shut off, so we tried again we managed to get going but only about 10 MPH at (WOT). the boat burnt less than 1/8 of fuel there, but on the way back it burned a half of tank, so when we got home we ordered a remanufactured 2 bbl carb, new cap and rotor and new plug wires, we tried it again today and it did the same thing but when you gradually increased the throttle it will rev but but when you punch the throttle the RPMs refuse to rise............???????????? PLEASE HELP??????????

 

[hotrod77]

Re: 92 searay wont rev

Any Ideas???? Anybody?
Also last season we replaced the original motor with a new 4.3.

 

[Struc]

Re: 92 searay wont rev

My suggestion would be to post in the Mercruiser I/O section. This area gets very little traffic.

That said, it sure sounds like a fuel problem. Since you said you replaced the carb, that would have been my first guess. What about the fuel pump? I assume it's a mechanical pump? I can't explain how it would burn more fuel unless it is somehow creating more pressure than it should, and overpowering the float in the carb, though.

 

[hotrod77]

Re: 92 searay wont rev

Thanks< ive beem told that by a mechanic but ive also been told that my ignition might be bad, which is not allowing the spark advance activate so that causes to much fuel for very little spark.
Mercury I/O section?

 

[Struc]

Re: 92 searay wont rev

Yeah, this is the Sea Ray section. Your engine / drive are Mercruiser, however. There is a seperate posting area for that.

http://forums.iboats.com/forumdisplay.php?f=21

Do you have a timing light? It would be a pretty easy thing to check and see if you're getting timing advance or not.