Outboard Motor Problem?

[BassinNCstyle]

I'm new to using out board motors. Today while trying out my new boat the motor would would seem to slow down then shut off with smoke coming off as if overheating. Water pump working, but I eye balled oil amt to mix with gas and now wondering if maybe I didn't put enough. Would to little oil in gas cause what happened?

Thanks

[Nitrofreak]

I'm new to using out board motors. Today while trying out my new boat the motor would would seem to slow down then shut off with smoke coming off as if overheating. Water pump working, but I eye balled oil amt to mix with gas and now wondering if maybe I didn't put enough. Would to little oil in gas cause what happened?

Thanks

When you say new, Is it new to you or is the boat/engine brand new?

The boat "Engine" not motor requires most likely a 50 to 1 oil mix of good quaility oil mix to lube the internal moving parts.

Could this be your problem? Maybe?

How do you know your water pump is working?

More info is needed like make and model of the engine, If you took the chance at "eye balling" the mix and did not get enough oil in it and ran it long enough to shut the engine down chances are good you may have damaged it in some way.

Did it restart after this happened?

If so how did it run after that, did it have power or lacked in power?

Did you hear any sound coming from the engine after it shut down like eggs frying in a pan?

[BassinNCstyle]

When you say new, Is it new to you or is the boat/engine brand new?

The boat "Engine" not motor requires most likely a 50 to 1 oil mix of good quaility oil mix to lube the internal moving parts.

Could this be your problem? Maybe?

How do you know your water pump is working?

More info is needed like make and model of the engine, If you took the chance at "eye balling" the mix and did not get enough oil in it and ran it long enough to shut the engine down chances are good you may have damaged it in some way.

Did it restart after this happened?

If so how did it run after that, did it have power or lacked in power?

Did you hear any sound coming from the engine after it shut down like eggs frying in a pan?

It's a used 9.9 Yamaha. Guy told me to do 100:1. Water does shoot out when running. It does start after the last episode. used TM to get back, It did make a hissing type sounds after shut off.

Thanks for your help.

[Glenn]

When you pump the bulb, does it get really firm after a few pumps, or not at all, or something in between?

[BassinNCstyle]

When you pump the bulb, does it get really firm after a few pumps, or not at all, or something in between?

Didn't really notice, the motor did run well though but then stalled.

[Nitrofreak]

Does it smoke a lot with 100 to one?

After it stalled did the bulb take several pumps to reprime?

Also check the prop and see if the lower unit is hard to turn, it could be the lower unit is binding causing the engine to work really hard.

[BassinNCstyle]

Does it smoke a lot with 100 to one?

After it stalled did the bulb take several pumps to reprime?

Also check the prop and see if the lower unit is hard to turn, it could be the lower unit is binding causing the engine to work really hard.

Only smoke alot when first started. didn't notice if bulb had issues.

[Nitrofreak]

Only smoke alot when first started. didn't notice if bulb had issues.

Check your owners manual and your spark plugs I think it is supposed to be 50 to 1 there may be too much oil mix, But don't forget to check that lower unit.

Also what fuel are you using? non ethenol? or are you getting it from your local gas station?

[slonezp]

Check your owners manual and your spark plugs I think it is supposed to be 50 to 1 there may be too much oil mix, But don't forget to check that lower unit.

Also what fuel are you using? non ethenol? or are you getting it from your local gas station?

100:1 is actually less than 50:1. 100:1 seems to be the correct ratio from what I've seen on the web. How do you eyeball 100:1?

This is off amzoil website:

Although many of today's two cycle engines use oil injection to automatically mix oil and gasoline, many due to size, weight, cost, or other considerations use premixed gas. For an excellent smoke free, odor free injector oil, consider Amsoil's HP injector oil, or for engines with exhaust power valves such as power sports applications, try Amsoil's Interceptor synthetic two cycle oil, or Dominator two cycle racing oil.

The formula for mixing two cycle oil properly is actually quite simple. Think of all units as ounces. If your two cycle engine manufacturer recommends a 50:1 ratio like many outboard motors, it means 50 parts gasoline to 1 part oil. Newer engines might call for 100:1 ratios. This means 100 parts gasoline to 1 part oil. A weed eater or chainsaw might call for a 16:1 mixture, or a 25:1 mix.

Let's solve the formula . One gallon of gasoline equals 128 ounces. A pint of two cycle oil is 16 ounces. Suppose you have a six gallon fuel tank.

Six gallons gasoline x 128 ounces/gallon=768 ounces.

Divide by 50 for a 50:1 mixture ratio.

768/50=15.36 ounces oil (approx. 1 pint)

Divide 768 by 100 for a 100:1 oil mixture.

768/100=7.68 ounces oil (approx. 1/2 pint)

So for six gallons of gasoline at a mixture rate of 50 to 1 or 50:1, use 15.36 ounces of two cycle oil. This is only slightly less than one pint. For twelve gallons of gasoline at 50:1 ratio, use one quart or a little less than 32 ounces. Likewise a six gallon gas tank mixed at a 100 to 1 mix ration would use 1/2 the oil, or 1/2 pint. Obviously the less oil used, the less pollution your engine will cause. The slight difference between the calculated mixture, and the amount in the containers is insignificant.

See the table below for the amounts of oil and gas for popular two stroke mixtures.

Two cycle premix ratio chart (NON multimix)

Ratio Gasoline Two cycle oil

16:1 one gallon 1/2 pint

16:1 six gallons 3 pints or 1.5 quarts

24:1 one gallon 5.5 ounces

24:1 six gallons one quart

50:1 six gallons one pint

50:1 twenty five gallons two quarts

50:1 fifty gallons one gallon

100:1 six gallons 1/2 pint

100:1 twenty five gallons one quart

100:1 fifty gallons 1/2 gallon

Also water pump may be working but not working efficiently. Did you have a compression check before you bought the motor. If the compression is off the motor can still run, but not properly.

[Glenn]

As you can see, it could be a lot of things. It's very hard to diagnose yourself. I suggest taking it into a qualified marine mechanic to give it a once-over and full tune up. And if the gas is older than, say, 3 months, replace it.

btw, smoking a bit after first starting it is normal for those engines. I wouldn't sweat it.

[Nitrofreak]

100:1 is actually less than 50:1. 100:1 seems to be the correct ratio from what I've seen on the web. How do you eyeball 100:1?

This is off amzoil website:

Although many of today's two cycle engines use oil injection to automatically mix oil and gasoline, many due to size, weight, cost, or other considerations use premixed gas. For an excellent smoke free, odor free injector oil, consider Amsoil's HP injector oil, or for engines with exhaust power valves such as power sports applications, try Amsoil's Interceptor synthetic two cycle oil, or Dominator two cycle racing oil.

The formula for mixing two cycle oil properly is actually quite simple. Think of all units as ounces. If your two cycle engine manufacturer recommends a 50:1 ratio like many outboard motors, it means 50 parts gasoline to 1 part oil. Newer engines might call for 100:1 ratios. This means 100 parts gasoline to 1 part oil. A weed eater or chainsaw might call for a 16:1 mixture, or a 25:1 mix.

Let's solve the formula . One gallon of gasoline equals 128 ounces. A pint of two cycle oil is 16 ounces. Suppose you have a six gallon fuel tank.

Six gallons gasoline x 128 ounces/gallon=768 ounces.

Divide by 50 for a 50:1 mixture ratio.

768/50=15.36 ounces oil (approx. 1 pint)

Divide 768 by 100 for a 100:1 oil mixture.

768/100=7.68 ounces oil (approx. 1/2 pint)

So for six gallons of gasoline at a mixture rate of 50 to 1 or 50:1, use 15.36 ounces of two cycle oil. This is only slightly less than one pint. For twelve gallons of gasoline at 50:1 ratio, use one quart or a little less than 32 ounces. Likewise a six gallon gas tank mixed at a 100 to 1 mix ration would use 1/2 the oil, or 1/2 pint. Obviously the less oil used, the less pollution your engine will cause. The slight difference between the calculated mixture, and the amount in the containers is insignificant.

See the table below for the amounts of oil and gas for popular two stroke mixtures.

Two cycle premix ratio chart (NON multimix)

Ratio Gasoline Two cycle oil

16:1 one gallon 1/2 pint

16:1 six gallons 3 pints or 1.5 quarts

24:1 one gallon 5.5 ounces

24:1 six gallons one quart

50:1 six gallons one pint

50:1 twenty five gallons two quarts

50:1 fifty gallons one gallon

100:1 six gallons 1/2 pint

100:1 twenty five gallons one quart

100:1 fifty gallons 1/2 gallon

Also water pump may be working but not working efficiently. Did you have a compression check before you bought the motor. If the compression is off the motor can still run, but not properly.

You are correct sir but I could not figure out why you used my post until I re-read it again...as one Homer simpson would say...DDDUUUUUHHHHHHOOOOOOO!!!!

My statement is false, I am sorry for the lack of brain cells, and thank you for the correction and the information posted.