93' Yamaha 70 dies
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93' Yamaha 70 dies Expand / Collapse
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Posted 11/8/2008 11:01:54 AM
Ruby Red Lip

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I just got my first boat, so I'm at your mercy. One of the problems is, with the prop in the water, when the prop engages while throttling up the motor dies. I can trim it up to where the prop is half out of the water and it engages fine, then I trim down to operate.

My second problem is it seems to run slow. I open the throttle all the way without satisfaction. I don't have anyway to tell how fast I'm going, but I know I should be going at least twice as fast. I have a friend that has a 75 hp that hauls a**. So, I know mine should be close to that. Anyway, any advice would be greatly appreciated.

Post #216682
Posted 11/8/2008 12:09:08 PM
Snapper

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If you plan to do this yourself, start with a compression check and ignition check. From there you will need to narrow it down to what system (compression, ignition, fuel, other) that is causing the problem. You can have it diagnosed just about anywhere for a minimum charge and then decide to repair yourself or have the shop do it. I will be more than happy to swing by or meet you at the launch to test it. Give me a call if you want some more advice while you work on it.

  

  

  

Davlor Marine, LLC

Boat repairs and detailing

850-777-7303

Post #216706
Posted 11/18/2008 11:30:25 AM
Ruby Red Lip

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I just realised that the motor is actually a 97' model, not a 93'. Looking at the parts diagrams and lists, they're the same motor. Or am I wrong?
Post #222203
Posted 11/18/2008 4:51:36 PM
Snapper

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Basically identical. Only a few differences. Testing procedure is the same.

  

  

  

Davlor Marine, LLC

Boat repairs and detailing

850-777-7303

Post #222358
Posted 11/18/2008 5:50:49 PM
Trigger

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The way I understand it, the powerpack on the motor controls the voltage to the coils under load, so if it's running low on power under load it could be the power pack.

I would first check compression on all cylinders and if compression seems ok, then I would look at getting a power pack.

The other thing to check is to make sure there is spark going to all cylinders. It may not be running on 1 or 2 cylinders....

Sometimes if you crank the motor or run it in the dark with the cover/hood off of it you can see if some of your spark plug wires are "arcing/grounding out" that's one quick way to check for spark misses.

Hope these help, post back up what fixes your problem!


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Post #222388
Posted 11/18/2008 7:33:14 PM


Mingo

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The carbs could also need cleaning. Thats how my boat acts when the main jets get clogged. It only takes a TINY piece of debris or oil residue to clog the little hole
Post #222463
Posted 11/18/2008 9:24:18 PM


Ruby Red Lip

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First thing, remove the prop and check for line or string wraped around the shaft that could bind the motor down!!

amarcafina
Post #222522
Posted 11/19/2008 3:53:24 AM
Ruby Red Lip

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Thanks alot guys, all great tips. I'll definitely post the cure. It will about 9 days before I can even look at it though. Thanks again
Post #222583