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2 stroke question

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2 stroke question

Postby chris moody » 01 May 2018, 09:47

I have a 2 stroke engine with about 10 - 15 hours on it. For the first 10 hours it was run on a 25:1 oil mix as per the running in guide in the operating manual. The engine has since not been used for around 12 months (other than occasionally starting on muffs with a 25:1 oil mix).

Should I repeat the running in procedure (on 25:1 oil mix) due to the lack of use for 12 months, or will I be ok running it on a 50:1 mix?
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Re: 2 stroke question

Postby Paul B » 01 May 2018, 09:51

I don’t see why you would need to re run it in. You’ve done the bedding in before , so it should be fine to run it at the 50:1 mix, just take it easy for a little while
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Re: 2 stroke question

Postby chris moody » 01 May 2018, 09:58

I was concerned that any lubrication within the engine internals may have dried out over the period of being layed up.

Paul B wrote:I don’t see why you would need to re run it in. You’ve done the bedding in before , so it should be fine to run it at the 50:1 mix, just take it easy for a little while
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Re: 2 stroke question

Postby Martin » 01 May 2018, 10:57

I have an old 1978 smoker Chris, I only use it once a flood.
Whilst laid up I add a little 2stroke oil straight down the plug hole and then generally just pull the motor over a few times every month (killcord detached)
Obviously this only helps to protect the rings from sticking and hopefully protects the cylinders somewhat, it’s certainly not as productive as running the outboard where the oil in the fuel gets to big/little ends whilst under compression in the crankcase.
If you want to be belts and braces I see no harm in running with a rich oil mixture for your first run out of the season, I still run mine with a high oil ratio even now.
Just remember it gunks up very quickly in the carb if you don’t drain it down or burn it off.
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Re: 2 stroke question

Postby sparerib » 01 May 2018, 14:41

Martin wrote:I have an old 1978 smoker Chris, I only use it once a flood.
Whilst laid up I add a little 2stroke oil straight down the plug hole and then generally just pull the motor over a few times every month (killcord detached)
Obviously this only helps to protect the rings from sticking and hopefully protects the cylinders somewhat, it’s certainly not as productive as running the outboard where the oil in the fuel gets to big/little ends whilst under compression in the crankcase.
If you want to be belts and braces I see no harm in running with a rich oil mixture for your first run out of the season, I still run mine with a high oil ratio even now.
Just remember it gunks up very quickly in the carb if you don’t drain it down or burn it off.



what he said :lol: :thumbsup
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Re: 2 stroke question

Postby chris moody » 01 May 2018, 16:52

So if I put the first tank of fuel through it at 25:1, and then switch to 50:1 after that I will not be doing something stupid and messing up an only just run in engine? As I've had it from new I want to take the best care of it I can.
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Re: 2 stroke question

Postby Paul B » 01 May 2018, 18:37

chris moody wrote:So if I put the first tank of fuel through it at 25:1, and then switch to 50:1 after that I will not be doing something stupid and messing up an only just run in engine? As I've had it from new I want to take the best care of it I can.

It won’t do it any harm, just will smoke a bit more, :lol:
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Re: 2 stroke question

Postby chris moody » 01 May 2018, 20:12

I'll try not to pollute your clean Scottish air too much with 2 stroke smoke

Paul B wrote:
chris moody wrote:So if I put the first tank of fuel through it at 25:1, and then switch to 50:1 after that I will not be doing something stupid and messing up an only just run in engine? As I've had it from new I want to take the best care of it I can.

It won’t do it any harm, just will smoke a bit more, :lol:
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Re: 2 stroke question

Postby Martin » 01 May 2018, 20:20

It won’t smoke anymore than it does already Chris.
It’ll be fine.
When’s the next service due ?
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Re: 2 stroke question

Postby Paul B » 01 May 2018, 21:22

Martin wrote:It won’t smoke anymore than it does already Chris.
It’ll be fine.
When’s the next service due ?

More oil in the mix the more a 2 stroke smokes, :Boxsmile
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