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Author Topic:   Need advice on motor!
ChrisCT posted 05-07-2002 08:00 PM ET (US)   Profile for ChrisCT   Send Email to ChrisCT  
Ok, got stuck out on Housatonic River last night and had continual stalls and eventually got in 2 hours later - just as it was getting dark. I think we narrowed the issues down to the facty that the spark plug wire came undone again (even after crimping it tighter) . However the motor ran a little rough even after we tghtly secured the plug and got gas flowing again (another rookie mistake had the full gastank sealed tight...) Anyway - even though financially it would be tough and since my boating confidence is in the shi**er - thinking I would be much better off getting a new or almost new motor.

My questions:

1)What,how, where, and how much can I get for current motor (85 Yamaha 70 HP - did 35 MPH real nice at around 2500 rpms til spark plug wire came loose and I started to stall)?

2)Where do I look for late model motors and what is reasonable price? My mechanic is going to price something for me. I found a few nice engines at, and I called the local Yamaha dealer and he wants 6700 for a 70 HP new Yammy, while telling me that my current engine would probably be wholesaled a 200-300 bucks. Oh and each spark plug cable runs $53 - I tried that approach first to see if that might solve problems. Haven't ordered those as of yet. Lastly a friend has an ex eemployee that runs a smaller Yammy dealer that may sell me one at cost - will hear pricing on that in a few days.

3) are their cetain motors that are better for my '76 Montauk or ones that will not fit or mount on it?

*Anyway regardless I'll probably go out this weekend and see if I can still have fun on it 'til I get this situation figured out. See those of you in CT on LI Sound!

browning20ga posted 05-07-2002 08:43 PM ET (US)     Profile for browning20ga  Send Email to browning20ga     
Man, You've got a delema on your hands. I'd be tempter to spend a couple hundred on a good tune-up and wires, unless you just have a rotten feeling in your stomach about the motor. A new motor gives you a sence of reliability, but I don't know the background of your motor or where you use it. An '85 might have 10hrs on it or 5000hrs. Good luck on your decission!
pamlico posted 05-07-2002 10:03 PM ET (US)     Profile for pamlico  Send Email to pamlico     
Hold on to your cash$$$$

Check the compression on that Yammie,...I like 90lbs plus per cylinders and no less than 10% on the others. You can get a good compression gauge at Auto Zone or Advance for around 25 bucks. Bottom line if compression is good the block, pistons and rings are good. Now if you drop 53 bucks in a new plug cable check the spark, can do it the ol fashion way by using a set of plastic pliers and holding the plug next to the engine block and check to see if your getting fire to the plug. Of course dont hold it next to the plug hole when doing this since any gas that might be in the cylinder could ignite. Now the more up standard way of checking the fire is using the spark tester which has wire leads coming from it, you plug them into your plug wires and it has a clip you hook on to your engine block for a ground. In the center of the spark tester is a row of points and when you turn over your engine fire jumps back and forth from point to point to show you have fire going to that cylinder. Those row of points can be adjusted to seperate them farther to check the strength of the fire from your plug wire. I like around 3/8 of a inch, if im getting fire at that range thats decent spark to me. Spark testers run around 45 bucks, but maybe if you have a good relationship with your local marine dealer he might put it on there for free,...hell it only takes second. You know just because you have spark doesnt mean you have sufficent spark,...a poor firing cylinder can lead to stalling, poor fuel consumption, poor idling and may not even start at all. These are just some quick things you can do before you go blowing thousands into a new one, maybe it need just a lil TLC!! And I surely beleive your motor is worth more than 200-300 bucks! Happy Cruising!!

jimh posted 05-08-2002 12:01 AM ET (US)     Profile for jimh  Send Email to jimh     
Since the motor was just running well and nothing catastrophic happened to it, it seems like you ought to be able to get it going again without too much effort.

If you want to sell it, you'll get much more for it if it runs well than if it doesn't. So a few bucks invested should pay themselves back even if you sell it next month.

I would be careful about pulling plug wires off when the engine is running. You could damage the HV coil. If you can get a new coil for $53 that is a bargain!


jimh posted 05-08-2002 12:03 AM ET (US)     Profile for jimh  Send Email to jimh     
Also: check the plugs, especially the one in the cylinder with the loose plug wires. The plugs may be badly fouled and contributing to your rough running.

Also check you gasoline for freshness. Old gas could be a problem, too.

Whalerdan posted 05-08-2002 07:44 AM ET (US)     Profile for Whalerdan  Send Email to Whalerdan     
What you do is your call. I was in the same boat earlier this year. Opted for a new (used) motor that was still under warrenty.

My old motor was a '85 115 Evenrude. I advertised it for $600 and the first guy that called bought it. I must have gotten 40-50 calls after that.

tabasco posted 05-08-2002 10:07 AM ET (US)     Profile for tabasco  Send Email to tabasco     
Try Catalano (sp?) in Greenwich Ct. They are one of the largest Yamaha dealers in Ct. After you get a cheap price from them call Skip Barbarie in Brandford..HE IS NOW A YAMAHA DEALER. He is one of the nicest guys and will give you a fair deal. Probably the nicest boat & motor dealer I have ever met. I am sorry I didn't buy my new Montauk from him.His number is (203) 488-2568

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