Motor Runs Great - Out of the Water!!-gctid400469

[Guest]

OK, so our second attempt at using the boat has not gone very well.

First attempt - The boat would not idle and when we did get it into gear it only ran at about 1/8th throttle. So I took it home, hooked the hose up and adjusted the idle and adjusted the linkage, making sure that the throttle opened up all the way. The butterflies in the carbs were not opening up at all.

Soooo. We launched the boat yesterday, fired it up, it idled ok (still a little rough), the wife went and parked the truck and trailer, gets in the boat and we back out of the launch and the motor stalls. Refire the motor and try and put it in gear, it stalls again. Refire the motor, try and just floor it putting it into to gear and it starts to take off then seems to starve for fuel and stalls. Try this over and over again with no luck. Now we have drifted about 100 yrds or so from the launch...break out the paddles and start paddling back, thankfully someone saw us and towed us back. Back at the launch I break out the tools and try to work on the motor. I could get it fired up, when I try and open the throttle it just starves and dies.

When the boat is out of the water and hooked up to a hose it runs great! In the water - puke

Anyone have any clue to what it could be? Fuel pump?

Thanks for any help or ideas

[2850Bounty]

I am not familiar with this outboard, but have a "long shot" suggestion for you:

Many of these older O/B's used an ignition advance system that was directly related to throttle position, rather than being derived via engine RPM.

Look at your throttle linkage for a connection to the ignition advancing system.

As you increase throttle position, you should see the linkage advance the plate that the ignition triggering unit is mounted to.

This may be rods and a bell crank.... or it may be via cams and arms.... I don't know.

But there will be some form of progressive ignition advance tied in with the throttle linkage.

This is very "Low Tech", but it works OK

You can throw a timing light on this engine just as you can with any engine.

Strobe the timing marks, and look for a progressive advance.

No Correct Advance..... NO Power!

This is likely a Reed Valve engine, so these may need to be checked also.

.

[Guest]

Not sure what the ignition advancing system is. Is it the linkage that is under the flywheel?Heres a pic of the motor, could you point it out?

[img]/media/kunena/attachments/vb/704236=29736-photo (1).jpg[/img]

[2850Bounty]

I don't know enough about this engine, but yes..... typically the advancing system would be underneath the flywheel area.

Ths linkage would rotate the triggering mechanism (probably contact points for this engine) and would pull it against the direct of the flywheel, causing the spark event to occur earlier.

Again, I don't know this engine, but if I had to take a stab at this, it would be the red arrows below.

Attached files [img]/media/kunena/attachments/vb/704258=29738-Force 85 hp outboard advance.jpg[/img]

[Guest]

Ooohhhh......op-

Yea, I messed with that the other day

Hmmm, looks like I will have to find someone with a timing light.

[2850Bounty]

If contact point triggering, it could also be a simple "dwell" issue.

Over at ME.com, there is a dedicated outboard forum for the Force engines.

It may be worth your time to join there, and post your questions.

[Guest]

Hey there.

I think bounty is right about the advance mech. Im 99% sure that it's a presto lite Cdi ignition which means no points. Check that all cylinders are firing! Out of the water with no prop load means nothing unfortunately.

The good new is these outboards are simple and reliable. Try the Chrysler force forum at I boats, there are some real experts there.

I have a 135hp Chrysler that shares your ignition. It has to idle higher than any other engine I know of to keep running when you shift into gear. It's weirdly high, but correct.

Chay