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I have a 1979 40 hp Yamaha 2 cyl outboard that I need to set the ignition timing and the accelerator link to the carburettor can any one assist with the procedure or specifications etc

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: low idling on daihatsu charade 83 model

My first thouhts are your ignition is still your problem, but upu haven't made it clear if the problem exists only when the engine is cold.

On the Charde you must push the pedal down before pulling the choke lever for the choke and fast idle linkages to engage... then start the engine.

The idle circuit consists of an emulsion tube and a solenoid. The solenoid is on the back of the carby and has a green wire running to it. If there isn't 12 volts on this at startup you wont be able to get the engine to idle without pedal assistance.

The carburettor also has an acceleration plunger that squirts a shot of fuel into the engine when trying to increase speed. This has a concetrina boot that can leak. It is situated on to op the carby.

The vacuum hoses need to connected correctly, especially one of the distributor hoses. That one must be connected to AD port on the carby. The following diagram is one of my modified layouts, but should work satifactorily. It is configured so that you can set the ignition timing a little more advanced than factory. When you set the timing make sure both hoses to the dizzy are removed and blocked. You adjust the dizzy position until the dimple on the flywheel lines up with the notch in the timing plate above.

Diagram here

For a test try blocking the hose coming from the oil cap to the bottom of the carby. The cap is also a PCV valve and if it's not clean it can allow excess air into the engine at idle.

My feeling is your points gap is not correct. It should be about the thickness of a hacksaw blade when open. The rubbing block on the points is notorious for rapid wear if hi temp grease hasn't been applied to the rotor lobes. A small gap will cause arcing under load and not provided sufficient dwell time for the coil to charge, resulting in a weak spark, missing, over fueling and lack of acceleration.

I also recommend you replace the plugs with Bosch Super 4's. They will last you a very long time and tend to be very forgiving with older worn engines.

Posted on Oct 11, 2008

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SOURCE: I need a maual for a Yamaha 85 hp outboard motor 1992 model?

Hello nic nic 68, I know that a autozone will have the manual you are looking for. If you still need assistance please post again and i will gladly help.
Please post what you decide to do and how you do it. I look forward to your posts.

Posted on Nov 11, 2008

Editor925
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SOURCE: Missing operators manual for Evinrude 2 hp outboard motor

Your best bet is ebay for a replacement user manual. Take a look around, you will come across one... For the meantime, gas oil ratio should be 50 parts gas to 1 part oil, i.e. 50:1. General care: Dont go full throttle for any length of time. Cruise of 3/4 throttle... Always flush engine after use in saltwater, including washing down exterior. Keep spark plugs in good order and check prop for fishing line wrapped around in near the prop hub. Otherwise, get a yearly service and have them check the water pump and replace as needed, get it tuned etc and gearbox oil changed.

Posted on Jun 20, 2009

bytestream
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SOURCE: need firing order for a 86 chrysler outboard boat engine

Firing order 1 2 3 is common on most three cylinder outboards. 1 3 2 is the only other combination.

Posted on Jul 26, 2009

  • 86 Answers

SOURCE: Spark plug gap 150 hp Yamaha outboard

The correct gap is .035

Posted on Oct 16, 2009

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