here's the link you need:


http://mototuneusa.com/break_in_secrets.htm


you can read it there....and discuss it here... :)

ive beat the piss out of my new topends the last 3 times now right from the get go.

always had good luck..

Hey cool john. I was going to ask you about this for my new motor.

thanks

DEREK

the hot rodding world has had a saying for about a half century now:

"break 'em in slow and they'll be slow, break 'em in fast and they'll be fast"

have to slightly disagree with how fast machines can be broken in on the dyno..... but that is probably because nitrided rings weren't in use at the time of the article's writing...

you can watch the power rise as ring seal gets better over each successive set of runs.....

6 runs to the rev limiter.... cool off with fans for a few minutes.... 6 more runs....etc...etc

until you have between 30 and 40 runs.....

and that's when the power stops climbing.... so break-in complete....

I always use the Motoman's theory. You have to get total ring expansion to fully seat, for a quality seal.

when I completed my last rebuild (venom 14:1 with nitrided rings) I fired up the quad (well, after a month of tracking down why it wouldn't start....stupid electrical connectors) and took off running it pretty hard. Not banging on the rev limiter or anything, but up through 3-4 gears and then engine braking it back to first gear, and repeating the process over and over for about 45 minutes. After that I pulled it back in the shop, changed the oil and filter and proceeded to ride it like I stole it from that point on.

My buddies thought I was being to hard on it for break in, as they like to putt around for about an hour before giving it any decent roll on acceleration, but it seems to me like the rings seated in very well and the motor runs a lot stronger than I expected it to feel for being no more than what it is (14:1 venom, fuel customs intake, and HC2). I know i'm not going to line up at the drag strip with the big boy quads and outrun them, but it certainly has plenty of power for having a good time!

Anyhow, what John has said in other threads, what the article above says, and what our local engine builder for our circle track race cars says all falls hand in hand. Break them in like you're gonna run them. We break in our 430 cubic inch small blocks on the dyno the same way.

Tell your Buddies they can use their procedures you use your's. And you'll meet them at the finish line.

Every top end I have ever done has ended up getting "broke in" at an XC race. 2 hours of beating the snot out of it and my boy loves the top end. Always worked out for us and the quads have all been fast.

for sure!

i was hoping youd post a link to motoman, he offers very good key points.

iv always been told this, but my dad hits me everytime i tell him hes wrong lol....moto-xperts has a page that tells u about there break in....check out the link, and tell me what you guys think...i dont like it...but my dads the one with the money, so gotta listen to the boss lol...let me know what you guys think..

http://moto-xperts.com/page19.php



now im all confused...how do i break in the two new race bikes?

Moto-Xperts, my ass. That is so old school theory. Convince your Dad to experiment with
each bike. Break the bikes in using each procedure.

if moto-xperts says anything contrary to what is outlind in this thread......

i'm not sure what they are experts on.... but i'm certain it isn't engines....

uh ohhh..... that statement should spark up a few comments.


I have dealt with Toby and he seems like a very smart person when it comes to the entire quad. From suspension to motor building, he sure knows his stuff. That and his excellent reviews is why I decided to have him perform the tranny mod and inspect my transmission during my last rebuild. 100% satisfied with the work performed and the customer service.


I do agree with the first post about a hard break in. I have done this with all of my fresh top ends and had excellent results with minimum blow by and no loss in performance. (until my crank locked up)

Yeah it will spark a few comments. I broke my MotoXperts motor in just as Toby said, and have over 100 flawless hours on it with NO smoke to this date. Runs perfectly.

To say one way is the only way is retarded.

wow mixxer...alittle harsh? i have trust in toby for everything to do with motors and suspension...but to cut up a competitor like that?


maybe ill break one motor in using toby's way...and the practice bike with the go hard off the start...

Here we go again with Mixxer.....

I broke mine in similar to Moto Xperts and have no problems related to break in.

The harsh comments are uncalled for.

Of course Toby isn't here to defend himself, with enough motors lined up who has time to bash other builders on forums?

uh oh this might get good....toby might not be here to stick up for him self..but everyone that has had work done by him is... why do you think it takes him so long to reply to his emails? cuz hes 3 weeks behind in work hes so swamped..and hes knows nothing to do with motors? sorry mixxer...think ur alittle off the game.

the take it easy break in procedure was popular back in the day, when you had big tolerences. These days things are machined much more tighter/accurate. I just give it two heat up cool down cycles and give her hell.

Looks like theres some confusion on what exactly they are breaking in!

I prefer to break in the rings and the bottom end seperately if possible. The bottom end will benefit with a few heat cycles an mild riding before you hammer the throttle.

Rings are the opposite, most rings are alot harder today as opposed to older ring designs, along with the newer honing. So rings that are very hard, nitrided being the hardest, will require you to ride it hard at the very first to seat them in properly.

So.... what should i do to break in my new topend and bottom end? thanks, Just a little confused now!

ok so what if you have a brand new cam and piston and rings dont they recommend that you rev the engine up to 2,500 rpm or so for 15 min for the proper cam break in. but here it says its bad to start it up and rev it because there is no load on the engine.