4 Stroke Engine Break-in

What do you think is the best break in procedure for a 4 stroke?
Dealer has synthetic oil in the bike right now.
I am thinking that synthetic oil will not let the rings seat properly.

I am considering draining the syn. oil and replacing it with 10/40 Valvaline

Then riding the bike hard as h$ll
Kidding.... But kinda serious...

Check this article out:
MOTOMAN

Another concern is I've already installed the White Bros. pipe which the dealer says I don't need to rejet for....
But Superbikes says that I need to go bigger on the main (160)
and drop the clip on the needle one notch.
Now lets say Superbikes is right.... but, I don't rejet that means I'm doing my break-in in a lean condition which can't be good Any intelligent thoughts/suggestions ??

[ 01-10-2003, 12:02 AM: Message edited by: treshombre ]

The owners manuals on all the new 4 strokes I've owned say ride for 15 minutes, then let the engine cool down,,, do this 4 or 5 times.

I believe this,, my Raptor seems to be a bit peppier than my friends who ran theirs in the ground the first day,,,,

All I know about synthetics is Consumers Reports says they're a waste of money. But they've been worong about alot of other things,, so who knows??

Whats your thinking behind the ring seating thing?
If the factory put it there to begin with that is what I would stick with.....just my .02cents
As far as riding during break in.....I've always gone 1/4 to 1/2 throtle on the first tank then 1/2 to 3/4 sometimes full throtle on the second tank....after that change the oil and I'm out!

Shane

Did you guys read the MOTOMAN ARTICLE CLICK ME CLICK ME ?

BTW ... I will be taking the White Bros. off during break-in

well i agree with the motoman article, and the engine builders i have dealt with say the same. you notice that its stressed that you fully warm up the enige before you run it hard. thats a good way to go all the time, not just for break in. as far as heat cycles i dont buy into that either.

Thanks Kevin....
I know thats some ratical concepts...
And you would think the manufacturer would know best But the manufacturer also told me to run my R at 20:1

The not breaking in with synthetics makes sense too. But the manual says to do it....

I really don't think that by its very own nature syntheic oil will allow the rings to seat in properly ...

Maybe some break-in time at Kennys this weekend is in order.....

When I got the 450, they were 'concerned' about breaking the bike in at Glamis.
Micnic came out and said to ride the small stuff (usuall for me anyways) and sand highway for 2 tanks. Change the oil and off you go.

As for not rejetting.. I think that is absolutely crazy personally. You can toss on the pipe anytime, but if you change the Intake at anytime, your air-flow going in changes and unless its fuel injected you must add more fuel. I just dont see any way around that. I went from a 150 to a 155 and now I find out from FMF that I should be at 155 min and probably at 160 or in the middle.
I also got a new needle with a better taper than the stock (OH the stock needle did NOT have any clips. only one position).
Run C-12 from the get go , But somehow I know you will do that anyways.. When you heading to Kennys? maybe I bring the KX for a little romping also..

Found a place called The Superbike shop its: http://www.esuperbikeshop.com/index.html
I called and talked with the Owner, Gary who is a really nice guy .
They are doing the R&D for the Polaris Predator for Polaris.
Kind of like Yoshimora (Sp?) is for Kawasaki ( His words )
He sounded very knowledgable and this is what he said...
Use the Motul 3000 ( 10/40) to break-in the bike
The WB pipe does not add enough horse power to effect the process..
He does recommend the jetting as quoted in my last post. But he said it is not enough of an issue
to worry about.

Also he stated That the 500 engine in the Pred is freeking bullet proof!
He said Polaris probably over built the thing not wanting durability issues and that you can beat the heck
out of it. Anyway thought I'd share I'll give Kenny a call and see whats the best time to go over there.... Hope its not muddy cause I hate to get the bike dirty

Give it a good 10 minutes to warm up than run the crap out of it. That’s what we do on the race bikes.

As far as the synthetic oils go, we run the synthetic in the top-end of the 450 but not in the bottom-end. Try to stay away from a synthetic when the oil comes in contact with clutch plates. It will cause your clutch to slip because the oil is to slick for the clutch plates to grab.

actually in the 450 alot of guys i talked with are running mobil one motor oil in the tranny. i run it and dont have a slipping issue with the clutch.

tres, its mostly dry at kens, there is mud but you dont have to ride in it, but i couldnt resist, i had to blast thru it .

Hey Chummin I'm thinkin Sat. Tomorrow about 1-2pm Talked to Kenny he said anytime was cool..... He can't ride though just had surgery yesterday I think.....

he had it wed

Some interesting theories. I wonder what he thinks of 2-stroke break-in...

Check out:
http://www.duncan-racing.com/
under tech center

What’s on Duncan’s site is the complete opposite as that Motoman article. The Motoman says, "...these principles apply to all 4 stroke engines..." and so I was wandering if he had a different theory for 2 stroke.