aq125b problems

[swallow]

i just pulled the boat out of the barn about 2 weeks ago after sitting for about 15 years if i prime the motor she will start and run for a bit then die out the carb is pumping feul into the motor and i have spark but not sure why it wont stay running. anyone with some tips on how to fix the problem i would appreciate it.

 

[grahamh]

Re: aq125b problems

The boat's been sitting for 15 years, you've got a long checklist to go through before any advice can really help you. Read up on the basics and go through that first....

 

[swallow]

Re: aq125b problems

the check list isnt as long as you think. ive spent 2 -3 weeks of 12 hour days workin on this boat and am now workin on the motor. ive already gone through the basics and its still throwin me a curve ball

 

[PiratePast40]

Re: aq125b problems

It'll be easier to help you out if you let people know what you've done to the engine so far. New plugs, wires, points, cap & rotor? Check dwell & initial timing? Fresh fuel in the tank & new filter? Alternate tank with new fuel? Carb rebuilt? Compression test? Timing belt in good shape?

Can be a ton of things keeping it from running correctly so it's time to start verifying and eliminating.

It's good news that actually starts.

Edit: One of the more likely scenarios is the carb passages being plugged. When it's running, look down the carb and see if you're getting any fuel flow out of the center standpipe nozzles. You mentioned that you have fuel from the accelerator pump nozzle but it won't stay running without fuel from the main nozzles.

 

[swallow]

Re: aq125b problems

i rebuilt the carb already and its getting fuel. i haven't changed the cap rotor plugs or wires yet but its getting good spark so im putting that off the timing belt is in good condition but i haven't actually checked the timing yet. i was guna do that today but i got called into work. but i had it running pretty steadily about a week ago and after the carb was rebuilt thats when the problems started. i adjusted the carb to the specifications that are in the owners manual and still no changes. also it back fires every once and a while while trying to start it. also im in the process if cleaning the gas tank too so im using fresh gas out of a Jerry can. and it has good compression

 

[captmello]

Re: aq125b problems

How long does it run before dying out??

BTW, IMO, you need to replace all the tuneup parts and set your dwell and timing.

 

[swallow]

Re: aq125b problems

it runs for about 30 seconds and i checked the timing today and its at about 8 degrees. how do i check the dwell

 

[PiratePast40]

Re: aq125b problems

For setting the points, this is a link to that section in the "adults only" sticky at the top of this forum:http://forums.iboats.com/showthread.php?t=335302

You're running into multiple unknowns - that's why everyone is recommending that you do a complete tuneup. Now that you know the ignition timing is pretty close, you can concentrate on the other items.

If you haven't replaced the plugs yet, at least pull and clean them. DOUBLE CHECK your firing order as well. It's real easy to have the wires crossed. As far as replacing the wires, I've actually had an old plug wire just break off at the boot when I bumped it so it's a good idea to replace those as soon as possible. There's nothing special about marine plug wires except that stainless steel core is best. You can buy those at any auto parts store. If you don't, you're just adding to the list of what the problem might be.

To look into the issue of why it stops running after 20 seconde AND why it's doing it after the carb rebuild, you have to verify what you do and do not have. You say you have fresh and clean gas getting to tha carb - that's a good thing. Is the accelerator pump working and squirting fuel as you open the throttle? While running is there gas coming out of the nozzles in the standpipe? These are the things to look at to see if your carb rebuild and cleaning was successful.

I've heard of people using a soup can with gas in it and just dribble some gas down the carb to keep it running. Of course, I'd never do such a thing but have heard of others trying that to keep an engine running.