[judcrews666]

Well I put new plugs in. Changed the wires around and put new oil and gas in it. I rode around for about 4 hrs and I never fouled a plug. Now a problem I had in the spring is back. It runs rough from idle to 2000 rpms. Above 2000 and it runs fine. At idle the motor is really bucking around. If you are running at 2000 rpm it will drop down to 1600 to 1800. It might come back up to 2000 are it might not. When it did it the fisrt time in the spring the dealer said the blub was bad and changed it. I did not think they fixed it but they said the motor is fine. Now it is getting worse. Any ideas. Plus this motor might have 25 hrs on it. I am about ready to get rid of it. I got new so I would not have to worry about. My 20 yr old Johnson runs better this this motor. Thanks for the help. more

[dan.klasson]

Let us know the results and we'll take you to the next step.

[jiffy]

Do a search on DVA's here there are a couple of guides for making your own or you can buy one. [links]

[romanoza]

Then go over to www.cdielectronics.com and download the ignition/charging systems trouble shooting guide for your engine. [links]

[devrandom]

The spark plug is getting fouled with a wet brown deposit and has had to be cleaned prior to starting each time.
This has been getting worse for a while.
I did a longer run the other weekend and now the engine refuses to start at all.
I suspected the head gasket first and removed the head.
I can't see a problem with the gasket.
I have now removed the power head and split the crank case.
A lot of brown deposit and the crank has rust spots on it.
I suspect water getting into the crank case but can't find any obvious route past the gaskets. [links]

[sleasalo]

I am having a problem with my Tohatsu 3.5 - 2 stroke outboard.
I normally us the outboard the go out to our swinging mooring, about 5 minutes run each way.

[SheriffWoody]

Has anyone had a similar problem?
What is the cause?
Do I just put it all back together with new gaskets having cleaned up?

[donpdonp]

[mati]

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[xuO4k04c6Ng]

Carbon is conductive and the electricity follows this less resistant path rather than creating a spark at the electrode. Carbon fouling is not the plug's fault, however, the outboard's owner had installed a plug that was too cool for the engine. ( In fairness, the plug was recommended by a store clerk as a replacement for the original plug the owner had asked for>) At any rate, changing to the correct plug had the engine starting and running beautifully. [links]

[jwalck]

A visual inspection of your boat engine's sparkplugs can help you diagnose problems. In this instance, a case of hard starting was the result of carbon buildup on the plugs.

[ztristanmathisn]

For top performance, always make sure to replace any parts with those meeting the specific recommended by the engine maker.

[Robin]

[dob]

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[SawEfDir]

Over tightening can be as bad as under tightening. Or worse. Is your torque wrench known to be calibrated properly? 18 pound-feet is not much.

[jonibangetz]

Think about it. A properly torqued plug with a known good gasket has to keep high pressure within the cylinder from getting past the spark plug. If oil is getting past the plug then something is just not right with the seal of the spark plug.

[Kiv]

Think about it. A properly torqued plug with a known good gasket has to keep high pressure within the cylinder from getting past the spark plug. If oil is getting past the plug then something is just not right with the seal of the spark plug. here

[jomiller1017]

Hard to believe that all four plugs would have the exact same failure mode. [links]

[Peterv]

What brand of oil are you using? more

[Gavin Andresen]

Check the oil control rod to make sure the linkage or linkage clip is not broken.