Author Topic: New Rebuild "Break-in"  (Read 1202 times)

hub350

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New Rebuild "Break-in"
« on: May 22, 2009, 10:25:19 PM »
Alright -almost ready to start my first engine break in but what process should be used. Break in fast an hard or slowly build out to it.
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Here are a couple I found:

#1
1) My trick is the heat cycle break-in, 3 times.

*1st cycle: Ride the bike. Go NO MORE than 1/2 throttle, with NO hard accelaration. Ride the bike until it is to operating temperature like normal, then park it. Wait until it is cool to the touch (on the pipes/radiators). You want the motor 'ice cold', not warm.

*2nd cycle: Take the bike out again, this time go NO MORE than 3/4 throttle. Go through all the gears, NOT WINDING it out- short shift. Stay away from hard accelartation. Get it to running temp, and park it again. Wait for it to cool down a second time.

*3rd cycle: Take the bike out, this time go through ALL the gears, but don't bring it to redline. You can go as hard as you want in any gear, but don't hit the revv limiter. Get to operating temp, and park it. Let it cool down one last time.

After it is cooled down the 3rd and final time, take it out and tear it up. Like I said, you will hear X different ways for break in, but this is my choice. I have 7 rebuilds, ranging from rings, to piston and rings, to cranks, seals, etc. and not once ever had a problem.

#2

If you have a pre-mix system (mixing oil and fuel in the fuel tank), then you should richen the ratio to about 32:1 for the first ten gallons of gas. If you have an injection system (putting oil in a separate oil tank), then you should put 50:1 premix in the fuel tank along with the oil injection system for the first ten gallons of gas.

During the first 10 gallons of gasoline, there should be NO full throttle operation. First idle the engine for about 10 minutes to ensure that the engine is properly warmed-up. Then begin varying the throttle position up and down, up to 20% throttle for a half hour. Then come back and let the engine cool off completely - it should be a good 30 min break. After it cools down, you may now ride it up to 50% throttle for another half hour or so. Then come back again and let it completely cool down again. Now you can go out and ride up to 90% throttle. Continue this for the remainder of the 10 gallons, never holding one throttle position for more than a few seconds. Do not run at a steady throttle position and do not go to 100% throttle. After your first tank of gas, replace your plugs with fresh ones. For the second tank, you may ride normally with one exception - do not hold it at 100% throttle for more than a few seconds. After the second tank of gas, you are completely broken in and may ride anyway you like.


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Please help!!!

PilotHawK

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New Rebuild "Break-in"
« Reply #1 on: May 23, 2009, 12:55:24 AM »
I've had success with the following.

Warm it up to operating temp blipping the throttle every 20-30 seconds. After it has been warmed up shut it down and let it cool off. After it has cooled off retorque all the cylinder head bolts and base nuts to the correct specs.

After you have retorqued everything to spec warm the machine up COMPLETELY again and ride it around for a few minutes. During this ride if everything is acting as suspected you can then ride normally.

With an air cooled or any other 2-stroke it is extremely important to warm the engine prior to riding.

As far as oil is concerned don't change the ratio you plan on running during the break in process. This will only change your jetting and lead to running lean and fouled plugs.

This is how I do it, but there are 2 schools of thought. Take it easy, or run it hard. I choose the second, and it has worked well for me.

hub350

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New Rebuild "Break-in"
« Reply #2 on: May 23, 2009, 05:51:42 PM »
Very nice - it started on the first crank -WOW!!  Thanks for the great advise on the break-in. She smoked real good in the beginning but once I took her out the second time she was dialed in.  I thing I have an issue with the clutch or tranny - it pauses when I firsat give it gas - maybe thats normal- anyway - shes running!!

Thanks