Breaking in a piston

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Breaking in a piston

Postby jack12 » Sun Jul 08, 2012 6:01 pm

I have a knew piston in my moped what is the best way to run it in? some say do it slowly some dont ? thanks
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re: Breaking in a piston

Postby John » Sun Jul 08, 2012 8:18 pm

I do hard heat cycles but there is always a nay sayer! Google, then make you decision. We can't tell you one way or another. I have never broken a bike in easy.... ride it like you stole it, but make sure you have the right oil/gas mixture and jetted properly with the proper plug for you bike. Get 'er done!
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re: Breaking in a piston

Postby greenhead » Sun Jul 08, 2012 9:11 pm

I'm new to this site and Mopeds in general, so grain of salt. I just got started in mopeds last year and have done two E50 rebuilds, with new kits, just like the previous poster I ride them hard and at 240lbs they get abused. I used this post from 1977 and I think its been part of the secret to my success of no seizes. https://www.1977mopeds.com/blog/2011/03 ... r-success/ . Without a tachometer I don't know how you would do a graduated break-in.
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Re: Breaking in a piston

Postby xrongor » Tue Jul 17, 2012 11:52 pm

jack12 wrote:I have a knew piston in my moped what is the best way to run it in? some say do it slowly some dont ? thanks


i doubt you will find things different here. some say slowly, some say quickly. the one thing i think we all agree upon is that you need to break it in with actual oil based out of the ground 2 stroke oil and not to use synthetic oil.
"In this world there's two kinds of people... Those with loaded guns, and those who dig." -- Blondie to Tuco
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re: Breaking in a piston

Postby Ike » Thu Jul 19, 2012 11:52 am

I rode a brand new Tomos wide open for six days from Ohio to Florida with Synthetic 2 stroke oil
That was six years ago. That bike is still running strong today.
I say run it wide open straight out of the box and don`t worry about it.

Ike
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and only Tomos can make a Moped!
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re: Breaking in a piston

Postby TPR950H » Fri Jul 20, 2012 6:02 pm

related question, lets say i got another cylinder (used, but new to me). is it safe to run my old piston or do i need to get another piston and break it in with the cylinder simultaneously?
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re: Breaking in a piston

Postby John » Mon Jul 23, 2012 4:38 pm

Probably want a light honing of the cylinder and new rings. Check big and small bearing tolerances.
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