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  #1  
Old 03-18-2004, 09:17 PM
BeastlyCowlick's Avatar
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Default How to break in a two stroke

After I finally get the bike back together with a new crank, rod, and top end how should I break it in? I've heard idle it for 30 sec then run it at 1/4 throttle for two tanks of gas. What do you guys think????
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Old 03-18-2004, 09:26 PM
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Default Re: How to break in a two stroke

don't go hard on it, but don't go easy. Go in the powerband at least, just don't scream it the whole time like you're racing it. Ride it somewhat hard, but not really hard.
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Old 03-18-2004, 09:28 PM
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Default Re: How to break in a two stroke

Well I'm working through a $600 rebuild and I don't want it to blow prematurely. You sure this isn't hard on a new engine to run it like that?
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Old 03-18-2004, 09:32 PM
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Default Re: How to break in a two stroke

I have always done Heat Cycles...I warm the engine up like you should always do before riding(I warm it up until the radiator is good and warm)then I ride for around 10 to 15 mins...like Mikey said..I get in the powerband for short bursts and I don't baby it..then i stop and let it cool..then do it 2 more times...
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Old 03-18-2004, 09:36 PM
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Default Re: How to break in a two stroke

Ok thank you, and Honda_Rider_XR I wasn't trying to be mean and make it sound like I don't trust you its just I'm 14 and I don't have a lot of money so I want to make sure i am doing the right thing. Thanks for helping.
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Old 03-18-2004, 09:38 PM
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Default Re: How to break in a two stroke

The bike was designed to run in the powerband it won't kill your $600 job to run it in the powerband. I will kill your $600 job to scream it in the powerband. I mean all the time, full revving. You can get into the powerband for short times and not do any harm, infact it helps seat the rings a lot better than babying it. And change the gear oil after EVERY ride


Edit: No prob dude, i was 14 once and have a KX80 and i know it's hard to believe but it's true! Just don't scream it but ride it a little hard (like 1-2sec. in the powerband, or little bit longer, remember to shift!)

Last edited by Honda_Rider_XR; 03-18-2004 at 09:41 PM.
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Old 03-18-2004, 09:42 PM
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Default Re: How to break in a two stroke

Thanks alot sounds like a plan.
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Old 03-25-2004, 08:45 AM
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Default Breakin In

I have a rule of thumb I use.

First of all, I premix my fuel a bit richer than normal.

A good warm up period, as MattXR stated, is a must for each ride period.

Overall, the first 4-5 hrs I run bout 3/8-1/2 throttle with short throttle opening bursts. It's good for seating as HondaRider stated. Don't run for more than an hour at once without a cooldown period.

Gear oil has nothing to do with your top end, but now is a good time to change it if you desire.

For the next 5 hrs. of operation, I get a little more throttle up to 3/4, still experiencing full throttle blips (in the turns and stuff).

Change gear oil

After this period, I change to my normal mix ratio, and I will ride normal with the exception of full throttle openings no longer than 5-10 seconds. That's only for the next couple hours.

Balls out from there!!!:
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Old 03-25-2004, 08:48 AM
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Default oh yeah

I'm going through the same thing as you as I am boring my cylinder .20 over, milling the head, and putting back in an oversized Wiseco Pro-lite piston
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Old 03-25-2004, 08:57 AM
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Default Re: How to break in a two stroke

I did a total rebuild on my CR also. Tore it down and put in new Wiseco Crankshaft,OEM Crank Bearings and main seals,Brand new cylinder(didn't feel like waiting forever to get it back from USChrome),Wiseco Pro-Lite piston. Mine is running AWESOME. Very Strong motor.
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  #11  
Old 03-25-2004, 09:05 AM
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Default Re: How to break in a two stroke

"First of all, I premix my fuel a bit richer than normal."

this is impossible....actually you are just leaning the fuel
adding more oil but just leaning the burn

if you want to richin the fuel mixture your gonna need to rejet.

Please read this article

[Only registered and activated users can see links. ]
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  #12  
Old 03-25-2004, 09:24 AM
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Default Re: How to break in a two stroke

Quote:
Originally posted by carey14
Please read this article
[Only registered and activated users can see links. ]

A strong word of caution:

One evening I read every article that web site listed above has on it. Unless I missed something, every context in which the author writes is with fourstrokes in mind--not two strokes.

I am not a betting man, but I would surely lay money down that if the principles outlined in those articles were applied to two strokes, your break-in procedure would be over in roughly five minutes, and then you would be faced with a top-end rebuilt once again.

Mind you, in the fourstroke realm, the author does make an interesting argument for his position on break-in procedure. But he does acknowledge that sincere, knowledgable individuals in the industry do disagree with him on his approach . . . .
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Old 03-25-2004, 10:05 AM
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Default Re: How to break in a two stroke

dcox.....I just emailed him to find out if his theroy is applicable to 2 strokes.......I thought I read on his website somewhere that it was.....but I'd like to confirm it also

thank you for making this point.
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  #14  
Old 03-25-2004, 10:44 AM
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Default Re: How to break in a two stroke

Please do post what his response is and why.

I do know of one ATM member who, if their record of how things transpired is correct, applied the "hard" break-in on their newly-rebuilt two stroke and had the outcome I mentioned above. I do use his approach for new Cummins diesel engines, however, because that is precisely what Cummins engineers advice.
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  #15  
Old 03-25-2004, 11:07 AM
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Default Re: How to break in a two stroke

I will post the response as soon as I get it

but from my personal experience with the RS I rebuild the top end approx every other race unless It ends abruptly.............and I havent put much time on the meter...........
...........my break in procedure thus far has been
after a rebuild in the garage I do a few heat cycles up to operating temps just to make sure I put everything back together correctly.

then I load everything up in the trailer go to sleep and after work the next day I head to the track, adjust jets for conditions and proceed out for a warm up lap, then it's a full on practice session

I have yet had a problem with this but Im always willing to listen
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