new BOAT OWNER HAVING PROBLEMS

[MIKEROWAN]

I HAVE A BOAT WITH I/O MOTOR. NOT SURE THE YEAR, THIS IS WHAT I CAN FIND ON IT.
BZC
2.24.87
GM6269732
FIRING ORDER 165432
WHEN I START SOMETIME IT WILL BACK FIRE. AND NOW AFTER I CHANGED THE SPARK PLUG. WHEN REV IT UP IT WILL RUN OVER 6000 RPM. WHEN I PUT IT IN GEAR IT DOES NOT WANT TO GO OVER 4500 RPM. AND IS REAL SLOW...

I SEE THE FIRING ORDER LISTED BUT WHAT CLINDER WOULD BE NIMER 1

 

[Bondo]

Re: new BOAT OWNER HAVING PROBLEMS

WHEN REV IT UP IT WILL RUN OVER 6000 RPM.

Why would you Do That,..??............Are you Trying to Blow it Up,..??....

Is this a V8, V6, or a 4 cylinder,..??.....

Welcome aboard to the forums here at iboats.........
And,......
Please loose the Cap-Lock,...........

It's considered Rude,+ Yelling............
And Nobody likes to be YELLED at....................

 

[MIKEROWAN]

Re: new BOAT OWNER HAVING PROBLEMS

Sorry for the caps. it is a v6.

 

[180shabah]

Re: new BOAT OWNER HAVING PROBLEMS

Going out on a limb here and guessing that this is a 1987 4.3 V6. IF it is a 4.3 then the cylinder numbers are cast into the top of the intake manifold.

STOP] reving your engine in neutral, it doesn't mean anything and you are going to break things.

IF it is a 4.3, then 4500 RPM at WOT ain't all that bad.

Seriously though, more info is needed from you. Is it OMC, Volvo, Merc, Yamaha????? 2 or 4 bbl carb???

 

[MIKEROWAN]

Re: new BOAT OWNER HAVING PROBLEMS

i'm not sure i thought it was 4.3L GMC motor and the back says OMC. it has a 2 brl carb. when i got it we took it out ever weekend and pulled a tube it ran fine. then the points went out and i replave them. It still ran fine. but the last 2 times i took it out it does not want to run. it will not gain speed like it use to. it takes a long to to plan out. even with a small kid on the tube. (thanks for your help)



ALSO i will stop reving it up that high...

 

[Bondo]

Re: new BOAT OWNER HAVING PROBLEMS

Change your Fuel Filters,.......

It sounds like you picked up a dose of Water in your Fuel...............

 

[Don S]

Re: new BOAT OWNER HAVING PROBLEMS

Are you using the trim???? Have you ever operated an IO with trim before? What year is the boat?, and what length and type boat.
Most boat engines should run around 4200 to 4800 rpm at WOT (Wide Open Throttle) so rpm is not your problem, possibly.

 

[MIKEROWAN]

Re: new BOAT OWNER HAVING PROBLEMS

replace both of them about 3weeks ago. should i replace it again?
and do u think i should replace spark plug wires cap and rotor. i have no problem doing this just don't want the wife to say "see you bought a money pit!!!"

 

[180shabah]

Re: new BOAT OWNER HAVING PROBLEMS

just don't want the wife to say "see you bought a money pit!!!"

Unavoidable - it is a boat, and it is an OMC - you gotta double whammy!

If you don't know the age of your ignition components, then by all means, it is time for a new cap, rotor and plugs.

 

[MIKEROWAN]

Re: new BOAT OWNER HAVING PROBLEMS

should i try to fix it and sell it. try to find an outboard?

 

[WillyBWright]

Re: new BOAT OWNER HAVING PROBLEMS

Did you get automotive points? They won't last more than a few hours at best. You need marine points.

 

[Bondo]

Re: new BOAT OWNER HAVING PROBLEMS

should i try to fix it and sell it. try to find an outboard?

There's Nothing Wrong with an I/O,......... I Love'm.......

It's the OMC that's the Problem..........

Get it Running,+ Dump it for a boat with a drive built by an Existing Manufacturer,.............

That means No OMCs, or Yamahas, or those German 1s that I see talked about now,+ then..........

Which leaves you a Choice of Mercruiser or Volvo.......... Which both run Chevy engines.....

 

[MIKEROWAN]

Re: new BOAT OWNER HAVING PROBLEMS

yes i do. how do i get marine parts (will an auto part store have them?) because i don't know what motor i have we just match the points up with what ever he had in the back of the auto part store.
Where could i find any type of number to tell me what kind of motor it is?

(just wondering why would automotive points won't last?)

 

[Bondo]

Re: new BOAT OWNER HAVING PROBLEMS

NAPA carries the full line of Sierra parts,......Ask for catalog # MSP-7......

 

[Gary H NC]

Re: new BOAT OWNER HAVING PROBLEMS

NAPA has a good line of marine parts made by Sierra. Don't try Autozone or Pep Boys ect...They have no clue on marine parts.

Replace points again,plugs,wires,cap,rotor and condesor. Make sure the Dwell is set correctly.Then if it still runs bad you know you have ruled out the ignition except for the coil. Use only AC MR43T plugs..gapped at .035

The OMC drive can still last you a long time if properly maintained. It is still a GM engine.

 

[MIKEROWAN]

Re: new BOAT OWNER HAVING PROBLEMS

OK THANKS!!!!!!
Some where to start...
what is the DWELL? the gap for the points? and what should it be.

one more thing is 87 gas ok to use?

 

[MIKEROWAN]

Re: new BOAT OWNER HAVING PROBLEMS

I ALSO REPLACED the coil with one i matched up in the auto part store should it be a marine coil????

Some where to start...
what is the DWELL? the gap for the points? and what should it be.

one more thing is 87 gas ok to use?

 

[superpop]

Re: new BOAT OWNER HAVING PROBLEMS

You need to make sure you are only using marine parts on your boat especially anything electrical or you will have a serious fireworks display on your hands. Boats with Auto parts go boom, I think the coil is indeed different for marine apps.

 

[180shabah]

Re: new BOAT OWNER HAVING PROBLEMS

Great advice on using marine parts. however the coil is one thing that you can use a auto eqivilent. Some folks will tell you that you have to get an epoxy filled coil for a boat, because of the vibration, but the stock Merc coils are oil filled and they hold up just fine. You will need to make sure you are replacing like for like (internal or external resistor) though.

 

[MIKEROWAN]

Re: new BOAT OWNER HAVING PROBLEMS

napa is closed today so i went to advance auto and found the cap, btn and points, looked in the book and it said for mercruiser engine would this be fine?

do you know what the gap should be (.019)?
i also have a prop that is 21 should i change to a 19?