Breaking-in a new engine

I've been running brand new engines with sabre at 50:1 even during brak in 4 so far that show no sighn of quitting

__________________
couldnt build my bikes without PIRATE CYCLES and billet from CREATIVE!!!!! THANKS JUSTIN!!

is there a specific mixture that your suppose to stick to? you say you used 50:1 ive been told 28:1 is there a factory set mixture for these engines?

This is a very contested subject. I lost one of the ring groove pins that keep the rings from rotating. I did the lots o oil real slow break in the first time. I did get 2500 miles out of it. I tore it apart to fix it and the piston showed tons of blowby. Heavy black streaking down the majority of the outside of the piston. I just rebuilt the top end and this time I used opti-2 at 50:1. I warmed it up for about 5 minutes then rode it hard for about 20 miles. Going from wide open to about half speed then wide open again. the wide open parts for 2-3 minutes at a time. I let it slow to a idle twice during the 20 miles (that suppose to let any metals leave the ring grooves) I do have a shift kit now so my wide open is not over reved. I have about 150 miles on the rebuild now. I removed the exhaust and looked in the port while I rolled the motor over. The piston is very clean, I have great compression, the bike is faster then ever. These cylinders have such a fine cross hone on them you only have about the first 20-25 miles to get the rings broken in. Once the cross hone is worn off there's nothing left to break the rings in against. I vote in favor of breaking it in hard and quick. Let it warm up well at least 5 minutes then go for it. The old breakin methods were for motors with the old cross hones that were heavily grooved and took a while to wear smooth. Just my opinion thou.

__________________
Put something FUN between your legs..

I had similar experiience to Junster and favor "hard and quick" breakin. I learned this from ice racing and motocross buddies and noticed easy breakin was resulting in weaker motors. Only difference is I use 50:1 Walmart oil from the start instead of synthetic.

I run everything here that is two stroke on 40:1 mix.

The "instructions" can be thrown away as soon as you get them out of the box. They usually state 16:1 or 20:1. That is waaaay too much oil, and detrimental to the engine.

Break them in at 24 or 25:1 and go to 32 to 50:1 after.

__________________
If it ain't broke, and you mess with it long enough, it will be.

I agree with Joe, anything 32:1 or higher is better. My pet peeve is the 16:1 guys that leave a black trail up and down my driveway. Not to mention Al Gore spinning in his grave. (he IS dead isn't he? )

Nope, just a little fatter and a little grayer.

__________________
If it ain't broke, and you mess with it long enough, it will be.

how about speeds, arent you supposed to keep it at low speeds at first? If so how can you run it wide open for so long?

When ya first break the motor in run it at 16:1 and open it up from time to time....vary you speed....high low medium....medium low high...blah blah blah....one gallon of mix usually does the trick....that's what I did...then went to 32:1....then 40:1....am about to try a 50:1 synthetic mix...my bike has almost 1000 miles on it without any signs of wear....runs like a bat out of h*ll....hope this helps...


Laters,
Salty

so don't keep it under 20 or anything like that, just don't run it too hard the whole time.

Am i getting that right?

Also is there any oil would be better for break in than others? I hear good things about opti 2.