Break-In Procedure

Discussion in 'Motorized Bicycle General Discussion' started by Vistaman73, Dec 16, 2009.

  1. Vistaman73

    Vistaman73 Chat Box Junkie

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    Hi, I would like to start a new thread all about how to properly break in your engine.
    Which way is right? Which way is wrong? How have YOU broke in YOUR engine? Do you reccomend your style? Do you regret anything? Please feel free to leave tips. I still need to finish my bike and I want to know how to break it in. Thanks!
    scratg
     
  2. Nougat

    Nougat New Member

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  3. Venice Motor Bikes

    Venice Motor Bikes Custom Builder / Dealer/Los Angeles

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    I agree with everything in the link above!!!

    I use 24:1 mix for the first 2 gallons & ride the heck out of it!! (always warm up the engine completely before going to WOT!!!)

    Then, after the two gallons of 24:1 mix, I switch to 32:1 for the life of the engine.

    My engines all run strong & fast using this method!!
     
  4. Finfan

    Finfan New Member

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    I used fossil oil at 20:1 for the first 2 gallons, then fossil oil at 25:1 for the second 2. Then I went to synthetic oil at 30:1 although that may be a little too thick. The reasoning is that the fossil oil will allow the engine to wear in properly. Then you switch to synthetic to keep it from wearing out.

    As far as use I would say to take it easy for the fist half hour or so. If there are any major problems with the build they should show by then. From there ride it like you are going to normally.


    brnot
    .wee.
    .duh.
    .dnut
     
  5. wes

    wes New Member

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    I fired up my last motor and it was suggested to let it sit at idle for 30 min in front of a box fan, i let it sit in front of the fan for about ten minutes at idle and took off, for the first 4 tanks i ran 24:1 and never held the throttle and a steady speed for to long, what i mean is i constantly feathered the throttle, i speed up for a few minutes and than let off and slow down for a few, than i speed back up but i kept away from WOT for too long for the first hundred miles or so, and my motor is a torque monster with a 36t sprocket and it is very responsive with Jims intake and a breathable exaust, Good luck and welcome to the forumn!!!
     
  6. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    Never idle an engine for any long period during break in, that's the worst possible thing you can do.
     
  7. DonnnN

    DonnnN New Member

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    I broke in mine with synthetic 2 stroke oil.. 24:1 during break in.. Never rode it longer than 30 minutes.. After break-in Im using 32:1.. Running strong and fast.. ; )

    dance1
     
  8. bairdco

    bairdco a guy who makes cool bikes

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    i used Opti-2 at 60 / 1 ratio, and full throttled it from day one. i also took the time to basically blueprint the motor before i ever installed it, and then i put it on backwards.

    i'm running about 80 / 1 right now, and the motors three weeks old with a few hundred miles on it.

    almost all of those miles are WOT.

    i don't recommend my method. at least not yet. if the motor lasts a few thousand miles, then i'll recommend it.
     
  9. Venice Motor Bikes

    Venice Motor Bikes Custom Builder / Dealer/Los Angeles

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    I concur!!!

    Just get out & ride it!
     
  10. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    Vary the throttle amount and engine speed.
    Don't do a lot of closed throttle downhill runs. (never a good idea with a two stroke).
    Check your plug after the first 15 minutes if all else is O.K., sooner if it's not. (to make sure your mixture is close).
    Don't go far from home for the first hour of operation, though you'll likely need to tweak the installation, not the engine itself beyond maybe a carb adjustment.
     
  11. wes

    wes New Member

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    Thanks Joe, I was skeptical about that one myself.
     
  12. bairdco

    bairdco a guy who makes cool bikes

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    basically, when you're going fast downhill with the clutch in, no throttle, or engine braking, since it's not getting any gas, it's also not getting any oil. so you're doing 40 downhill with a piston scraping all the oil of the walls.

    if i'm coasting down a hill, i usually "blip" the throttle a few times, just to give it some lube...
     
  13. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    I believe bairco was saying "with the clutch in" meaning "engaged".
    Depends what part of the country you are from.
     
  14. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    Anyhow, short idling periods especially with air flowing over the engine will hurt nothing. However, idling your new engine in front of a fan for a long period can glaze the cylinder, or worse. It's just not a good idea.
     
  15. xlite

    xlite New Member

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    I break in with 50:1 marine oil and do not baby it. I did this with 7 of my own engines and dozen or so I broke in for others. Some of these have many thousands of miles now and none ever seized or wore prematurely.

    Once I accidently idled a HT for 48 hours straight til gas run out, didn't seem to have any effect.
     
  16. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    That has to be an epic story, I have to hear it!!!!

    I know that many air cooled engines (without cooling fans) can idle for a long time without overheating, like the flat head Harleys of day gone by.
     
  17. xlite

    xlite New Member

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    I intended to "cook" the paint off for a few minutes like I do all new engines and simply walked away and forgot. Couple days go by and I was suddenly aware of a deafening silence. Went outside and found a hot engine that just ran out of gas. I'm amazed it idled so long w/o stalling.
     

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