My brother just had his 2-stroke motor completely rebuilt, top and bottom end. He has been told several different ways to break it in. A service guy at SBMS told him to take it easy for 10 hours. MW mech said 1.5 hours ride it like he stole it. And the people who rebuilt it said easy for 15 min let cool down and repeat a few times then after about 1.5 hours it should be good to go. Which is closest to being correct if any? Are the ways anyone found to work best for them. Oh his bike is a 97 Suzuki RMX 250. I know it is a dirt bike, but he couldn't find any decent dirt bike forums and I told him there are alot of knowledgable people on this one that know about more things than just trikes. I figure a 2-stroke is a 2-stroke no matter what machine it is in. Thanks for any help we can get.

 

Your friend that says to ride 15 min and let it cool is a good way to break in the motor, if you ride it like you stole it the piston will get to hot and expand and stick. You need the piston to expand and wear in slowly.

 

wut i would do is rip it but what ever u do dont hit power band for about 2, 3 hours. start it up and get the motor nice and warm and shut it off do that a few times. You'll be able to tell when the motor has set nice

 

97 Suzuki RMX 250, NICE bike!!!!!!! I cant give you advice on the 2 smoker yet, I will watch this thread closley, because I will be firing my YZ250 up next weekend, and I need to know how to break it in also. I do know he needs to bump up his fuel mix though for the break-in. And with that being a water-cooled, I'm sure he won't have to worry too much about the engine getting too hot right away and siezing the engine.

And here is a little tid-bit for the no-mechanics [img]i/expressions/face-icon-small-happy.gif[/img]......a Engine uses a fuel source....ie. gas......a Motor uses electricity...[img]i/expressions/face-icon-small-happy.gif[/img][img]i/expressions/face-icon-small-happy.gif[/img][img]i/expressions/face-icon-small-happy.gif[/img]

 

What about General Motor,s, Ford Motor company. By the way I have been a auto tech for 22 year,s.

 

Mike isnt exaclty unfamiliar with that stuff either bud[img]i/expressions/face-icon-small-wink.gif[/img]

 

You have a Engine in a car for the powerplant, and a wiper motor, stater motor, blower motor, not a blower engine, Any respectable school will tell you that aEngine uses a fuel source....ie. gas......a Motor uses electricity. Yes I don't have a darn clue why FMC, GMC uses that in there name? One of the mysteries of the world I guess, LOL [img]i/expressions/face-icon-small-happy.gif[/img][img]i/expressions/face-icon-small-happy.gif[/img]

 

Motor definition.... a rotating machine that transforms electrical energy into mechanical energy from websters
Engine....a machine for converting any of various forms of energy into mechanical force and motion from websters

 

Easy cowboy! let,s not argue about this without having a beer or two. Anyway I just hope you have fun on your enginecycle.

 

The way that I break a 4-stroke engine in, crank it up and let idle for the first 15 minutes, shut off and crank back up about 20 minutes later, on the second 15 minute interval i kinda play with the revs a little although never anything over half throttle. I do this for about an hour. then I take it out for about a 30 minute stroll being reasonable with it. I do that on and off till I get about 3 tanks of gas through it. Now, I am planning on applying the same theory to my 2-stroke scambler that I am rebuilding right now. I was planning on using a simialr theory on My 2-stroke scambler when I get it back in 1 peice. I could be way off base here but thats how I would do it.