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  #31  
Old 02-11-2003, 11:45 AM
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Default Re: Break in procedure

I didn't even notice that you were one of us... That is sweet...

I knew I liked you, I just wasn't sure why? Now I know.
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  #32  
Old 02-11-2003, 12:05 PM
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Default Re: Break in procedure

Quote:
Originally posted by Woody_CRF
I didn't even notice that you were one of us... That is sweet...

I knew I liked you, I just wasn't sure why? Now I know.
You mean it wasn't because of my charming good looks??
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  #33  
Old 02-11-2003, 12:15 PM
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Default Re: Break in procedure

LOL, Uhhh, Nope.
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  #34  
Old 02-18-2003, 11:18 AM
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Default Re: Break in procedure

I agree that you risk a cold sieze if you don't let the bike warm up before letting it rip, On my bike I start it and start letting it get warmed up while I put my helmet on, I then sit on the bike and wait until I can't keep my hand on the head or cylinder then I put it in gear and take off, This has given the Piston,Sleeve time to warm up and expand properly. I guess one way on a water-cooled bike to tell if its warmed up good is to put your hand on the radiator,when it gets good and warm then you know the engine is ready to go. Matt
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  #35  
Old 02-18-2003, 11:38 AM
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Thumbs up My procedure.

Ok, here is my procedure for breaking in an engine.
Hopefully I didn't leave anything out.

This is for a 2-stroke only!! I go with the Motoman method for my 4-strokes!!

Generally one tank of gas is plenty for break-in.
Use non-synthetic oil for your first tank of gas. Synthetics are too slippery, and will not allow the rings to break in properly.

There are many different methods as mentioned earlier.
I like to put my motors through several heat cycles prior to taking it out and riding it.
My last two motors I put through 10 heat cycles each, though it is not necessary to put them through that many. My theory is the more heat cycles the better.

I let the motor get warm to the touch and then shut it off. Let it get stone cold before the next heat cycle.
I lightly blip the throttle not holding it at any constant rpm the entire time (vary the throttle). Don't over-rev it, just lightly blip the throttle for the first few heat cycles.

Then I take it out (after 5-10 heat cycles in the shop) and ride it varying the throttle up to half throttle for the first ride. During this 1st ride, I'll vary the throttle (up to but not beyond) 1/2 throttle. Do this for ~ 15 mins.

Let it cool all the way till its cold.

2nd trip out, vary the throttle not going above 3/4 throttle. Ride it for 15 mins, and then let it cool to stone cold again.

3rd trip out, vary the throttle and take it to full throttle, but do not leave it there for an extended period of time. A few seconds at most. Do this for 15 mins and let it cool.

Do a jetting run now to be sure you are jetted correctly. Do this with a FRESH WHITE plug!!
Re-Jet if plug color indicates the need.

Now rip on it giving it gobs of throttle, still varying the throttle. Work the motor hard this time, and generate plenty of heat. Do this for at least another 15 mins.

Your motor should now be broken in.

Run the rest of the gas out of the tank and switch to a fully synthetic if that is what you normally run.
Re-Jet the bike for the new mixture, and you should be good to go!

Please note that whenever taking the bike/quad out on a run, it is ABSOLUTELY NECESSARY TO LET THE MOTOR GET WARM TO THE TOUCH BEFORE RIDING! OTHERWISE YOU RUN THE RISK OF SEIZURE AND YOU MAY HAVE TO RE-DO THE ENTIRE PROCESS WITH A NEW PISTON, RINGS, AND BORE JOB!!!!!

Last edited by 2fun; 01-14-2008 at 12:00 AM.
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  #36  
Old 04-17-2003, 09:21 PM
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Default Knowledge Base Candidate??

Cast your vote and rate this thread to send it to the KB for all time!
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  #37  
Old 04-18-2003, 01:22 AM
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Default Re: Break in procedure

Good stuff. 5 star here.
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  #38  
Old 04-18-2003, 11:01 AM
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Thumbs up Re: Break in procedure

Yep, I believe I gave it 5 stars too.

Either this one, or some of the others.:

I've rated more than one in the last few hours.:
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  #39  
Old 04-18-2003, 07:11 PM
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Default Re: Break in procedure

Looks like I did it the long way. First, I had to run 2 tanks of gas at 50% throttle. Then I had to run 1 and a half tanks of gas at 75% throttle. Then I got to go full throttle! I had gone 180 miles of breaking in before i could blast it!
Justin # 701

2003 KTM 250 EXC RACING FOUR STROKE
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  #40  
Old 12-18-2003, 12:14 PM
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Default Re: Break in procedure

HIG4s
"BUT NOTE, the web site says this is for any 4-STROKE engine, and I can attest that this is not the best way to break in a 2-stroke. Heat cycle 3 times, take it easy for a tank of gas. If you run a 2-stroke hard and fast right away they can seize"
Agreed but ->
This procedure is to be done only on a fully warmed up bike which can be done by the methods mentioned by others here "blip, blip" or slowly riding around on flat ground. The Heat Cycle method is designed to "heat treat" the metals. With common materials there isn't any heat treating going on. Also this procedure is so short the bike will never get very hot. You simply need to seat the rings. I agree it doesn't follow common wisdom but often truth is stanger than fiction. My friend broke in his new GSXR and cruiser this way and the oil comes out looking new.
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