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Breaking-in a new engine


Discussion at Motorized Bicycle Engine Kit Forum in the 2 Stroke Bicycle Engines & Kits forum. I got my engine from PowerKing about 3 months ago but haven't had the time to install it. Over ...
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Old 09-19-2009, 05:31 PM
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Join Date: Jul 2009
Location: Canada
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Default Breaking-in a new engine

I got my engine from PowerKing about 3 months ago but haven't had the time to install it. Over the last two weeks I've finally gotten around to getting a frame ready, stripped and painted and all that and I'll be mounting the engine this week sometime.

Anyhow, my question deals with the break-in procedure. The instructions that came with the kit call for a non-synthetic 2 stroke oil for the brean-in. Most of the oil for the gas mix sold in most stores is now synthetic or semi-synthetic and it's hard to find non-synthetic. But I found an S2 oil which the chainsaw store guy says is non-synhtetic. It is pricey though at almost $10 per quart compared to $2 or $3 for the synthetic stuff.

Anyways, so do you guys use the non-synhtetic stuff for break-in to help seat the rings and such?

In additio to the usual greasing of the chain and sprockets and clutch lever and taking it easy for the first few miles of riding, what what other preparations should I make. In another post I read to take off the side covers and check for metal shavings from the machining and casting process so that's what I'll be doing. But my concerns is also metal shavings in the crankcase itself. I would like to avoid splitting the crankcase to check for any irregularities since I want to avoid leaks or ruining the gaskets.

What about prelubing the engine before the initial start by squirting oil into the combustion chamber and crankcase to lube the cylinder walls and bearings and such?

Thanks in advance foe all the comments. Cheers.
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Old 09-19-2009, 10:47 PM
Motorized Bicycle Elite Member
 
Join Date: Feb 2009
Location: australia
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Default Re: Breaking-in a new engine

And so it starts again. My opinion synthetic is fine, ive broken it my motor this way and it goes just fine and ive never seen smoke from the exhaust.
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Old 09-20-2009, 01:10 AM
GearNut's Avatar
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Join Date: Aug 2009
Location: So Cal
Posts: 341
Default Re: Breaking-in a new engine

Putting a teaspoon of oil down the sparkplug hole could not hurt.

I recommend getting the better quality engine hardware kit from SBP and install it before you install the engine in the frame. Way too many folks have bolt failure soon after getting the bike together.
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Old 09-20-2009, 01:40 AM
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Location: Washington St.
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Default Re: Breaking-in a new engine

I agree with Gearnut, I used valvoline for air cooled 2 strokes during breakin. I have joined the Opti-2 crowd now. My next motor with be run with Opti-2 from day one. Do not split the cases. Do put a little grease on the right side gears. The main thing is not to run the motor to hard for the first tank full and not to easy after that. You need to set the rings to stop blowby. Everyone has a different opinion on this. I have over 2000 miles on my motor and it's still running very strong.
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Old 09-20-2009, 04:14 PM
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Join Date: Nov 2008
Location: Colorado
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Default Re: Breaking-in a new engine

Run it hard but very load on the engine and engine rpm. Don't want anything to be constant (load/rpm). I'm fortunate that I live in a hilly area and I run it full throttle uphill and then full throttle on straightaway and lower throttle on downhill portion. Engine gets a great workout throughout its rpm and load range.

No better way to get this rings seated. Its combustion pressure that pushes the rings against the cylinder wall. If you pamper it for the first tank, the rings will not seal as they should.

For oil: Maxima 927 at 32:1 is all you will ever need. Once broken in, you can then go to 40-50:1 without any worries. I speak from exeperience.
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Old 09-20-2009, 04:26 PM
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Location: west-central Illinois
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Default Re: Breaking-in a new engine

You can get Valvoline Multi-Purpose 2-cycle engine oil
at auto parts store . I believe it is TC-W3 certified non
synthetic, if you choose to go that way. I broke in 2
engines using it before switching to synthetic.
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Old 09-20-2009, 05:31 PM
Salty Gator's Avatar
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Location: Florida
Posts: 327
Default Re: Breaking-in a new engine

Quote:
Originally Posted by meowy84 View Post
I got my engine from PowerKing about 3 months ago but haven't had the time to install it. Over the last two weeks I've finally gotten around to getting a frame ready, stripped and painted and all that and I'll be mounting the engine this week sometime.

Anyhow, my question deals with the break-in procedure. The instructions that came with the kit call for a non-synthetic 2 stroke oil for the brean-in. Most of the oil for the gas mix sold in most stores is now synthetic or semi-synthetic and it's hard to find non-synthetic. But I found an S2 oil which the chainsaw store guy says is non-synhtetic. It is pricey though at almost $10 per quart compared to $2 or $3 for the synthetic stuff.

Anyways, so do you guys use the non-synhtetic stuff for break-in to help seat the rings and such?

In additio to the usual greasing of the chain and sprockets and clutch lever and taking it easy for the first few miles of riding, what what other preparations should I make. In another post I read to take off the side covers and check for metal shavings from the machining and casting process so that's what I'll be doing. But my concerns is also metal shavings in the crankcase itself. I would like to avoid splitting the crankcase to check for any irregularities since I want to avoid leaks or ruining the gaskets.

What about prelubing the engine before the initial start by squirting oil into the combustion chamber and crankcase to lube the cylinder walls and bearings and such?

Thanks in advance foe all the comments. Cheers.
I used a non-synth Pennzoil .....initial break-in of a gallon..( two tank fulls )...at a ratio of 16:1
after that backed off with the same oil at 32:1.....the first batch did indeed smoke a tad....not that much though....ran rough for a bit......but I tell ya....it's broken in now and simply * The Scream*




Laters,
Salty
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breaking-new-engine-test-image.jpg  
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Old 09-24-2009, 11:26 PM
Motorized Bicycle Elite Member
 
Join Date: Jun 2008
Posts: 182
Default Re: Breaking-in a new engine

Quote:
Originally Posted by Salty Gator View Post
I used a non-synth Pennzoil .....initial break-in of a gallon..( two tank fulls )...at a ratio of 16:1
after that backed off with the same oil at 32:1.....the first batch did indeed smoke a tad....not that much though....ran rough for a bit......but I tell ya....it's broken in now and simply * The Scream*




Laters,
Salty
was it 2stroke or regular oil...the best i have found is 2 stroke marine full synthytic...????Dennis
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Old 09-24-2009, 11:30 PM
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Location: So Cal
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Default Re: Breaking-in a new engine

Quote:
Originally Posted by drhofferber View Post
was it 2stroke or regular oil...the best i have found is 2 stroke marine full synthytic...????Dennis
Be carefull of marine grade 2-stroke oils. All but a few very old marine engines I have seen are water cooled (the water you are floating in).
Air cooled engines operate at different temperatures than water cooled engines and typically require an oil matched to the task.
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Old 09-24-2009, 11:49 PM
Motorized Bicycle Elite Member
 
Join Date: Jun 2008
Posts: 182
Default Re: Breaking-in a new engine

Quote:
Originally Posted by GearNut View Post
Be carefull of marine grade 2-stroke oils. All but a few very old marine engines I have seen are water cooled (the water you are floating in).
Air cooled engines operate at different temperatures than water cooled engines and typically require an oil matched to the task.
THANK YOU...Dennis
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