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Thread: Breaking in 2 stroke - Am i doing something wrong?!?

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  1. #1
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    Default Breaking in 2 stroke - Am i doing something wrong?!?

    I'm trying to break in the EC25PS. I have followed the manual, with 30:1 ratio, varying the throttle, under load, mineral oil.



    The exhaust is VERY smokey - adjusting the air screw makes some difference, but not enough. The engine is warmed up (when started there's huge amounts).

    There is also a small amount of oily goo coming out of the exhaust joint and splattering off the fan.



    Plug is biscuit brown, no oil inside cylinder when cold.



    Idling @2000rpm is just about ok for a minute, but it will quickly drop revs eventually dieing.

    Varying the throttle will keep it going though. if the throttle is opened, sometimes it picks up slowly, sometimes it makes that deep chugging noise and drops revs.



    I was also adjusting the blade pitch - 45 degrees and it will go too fast, so it's at 50 degrees now. I thought that might be the problem with the not picking up quickly. doesn't explain the smoke though.



    I'm new to breaking in engines, so any help please give freely



    It's 9 x 3z blades, 550mm duct. I'm pretty sure the max rpm is 4500rpm for the blades.



    Thanks!

    Toby

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    Default Re: Breaking in 2 stroke - Am i doing something wrong?!?

    i'm not familiar with your engine but most 2 strokes are smokey and chokey and don't always pick up well until they are well and truly up to temperature



    it's also not unnusual for a 2 stroke exhaust flange to be oily, in fact i'd say it's a good sign overall



    check your choke is operating properly, that can often give a chugging feel, cause engines to die slowly and produce excessive smoke



    but get everything well warmed up before changing things



    Tony




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    Default Re: Breaking in 2 stroke - Am i doing something wrong?!?

    Thanks. I will check the choke tomorrow, then leave it going for a while!

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    Default Re: Breaking in 2 stroke - Am i doing something wrong?!?

    you need to de pitch till you are getting 6500 rpm at the engine, the smoke should get better as it warms up

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    Default Re: Breaking in 2 stroke - Am i doing something wrong?!?

    you should be able to go to 40:1 to help stop the smoke

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    Default Re: Breaking in 2 stroke - Am i doing something wrong?!?

    If its a new engine, or been completely rebuilt, chances are it will smoke like a good un for a while. Its due to all the internal surfaces of the engine having a protective coat of lubricant added during the assembly process.





    My 447 produced huge amounts of smoke on its first proper outing, once that was burnt off (by running the engine) its runs clear.



    you always will get some smoke at startup, thats the nature of 2 strokes, but once the engine is running it will disapear.



    Are you using mineral 2 stroke or synthetic? mineral oils are always smokey, and produce a lot of ash. Synthetic on the other hand tends to burn cleaner and not have so much smoke



    Mart

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    Default Re: Breaking in 2 stroke - Am i doing something wrong?!?

    It's direct drive to the fan, fan's limit is 5800rpm, so the engine limit would have to be likewise. but yeah, 50degrees is too much at the moment.



    The normal mixture is 40:1, but for break in the thing says use 30:1.



    I'm using mineral oil; it recommends for break in:)

    It's new, so i guess would take a while to burn off the coating then?



    be back with some results later i hope!


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    Default Re: Breaking in 2 stroke - Am i doing something wrong?!?

    <font color="royalblue">The problem with synthetic oil is that it is so dam good at lubing, nothing can ever 'bed in', hence sometimes the reason why some manufacturers say to use mineral to start with for however many hours till all the high spots have worn off and when everything seems sweet, go to the leaner mix of synthetic oil and let it rip. That's NOT 'rest in peace', by the way, that normaly happens around the final lap of the world champs.



    I can't see that you are doing anything wrong... Your neighbours might though... ha ha.[/COLOR]

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