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  #21  
Old 02-06-2003, 11:53 PM
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Question Re: Break in procedure

Quote:
Originally posted by woody_raptor
I have bought quite a few brand new four strokes and I have babied some, and ridden the heck out of others and I honestly have never been able to tell a difference.
Don't the 4-strokes go through somewhat of a break in before you buy them??
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  #22  
Old 02-07-2003, 12:14 AM
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Default Re: Break in procedure

As far as I know they don't ... well unless you get a pumpkin.
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  #23  
Old 02-07-2003, 12:22 AM
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Thumbs up Re: Break in procedure

Too bad all motors aren't broken in when you get them.

That way, you wouldn't have to hold back for the entire day (almost) when you finally get a chance to ride it!
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  #24  
Old 02-07-2003, 12:48 AM
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Default Re: Break in procedure

I hear you... It is almost more than one can stand to not get on it.
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  #25  
Old 02-07-2003, 11:49 AM
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Default Re: Break in procedure

Ther are a lot of different ideas on this thread and I will throw in my two cents based on 25+ years of machining and drag racing experience. NEVER EVER use synthetic oil to break in an engine of any kind it WIL prevent proper ring seal. Synthetic oil is fine after the engine is broken in. As far as RPM during break in ,don't use excessive RPM but do put the motor in a higher than normal gear and accelerate briskly. Do this three or four times and the load put on the rings will go a long ways towards breaking in new rings. Idling an engine especially when new is the worst thing that you can do, it accelerates cam wear, glazes cylinder walls, increases oil contamination and all sorts of undesirable conditions inside your motor. The varying engine speed helps break in by letting tight spots get hot and expand and then to cool back down when speed slows down, do this often for your first tank of gas. Piston clearance is based on bore dia. and piston design. If you check specs for most water cooled engines 2 or 4 stroke you will see that they are very similar or even identical as far as piston to cylinder wall clearance. The piston does not have much to do with compression other than ratio, the rings "hold" compression (when properly broken in) the piston just carries the rings. As a matter of fact look closely at a piston and you will see that the area where the ring package is located is undercut and never contacts the cylinder at all. As far as sanding a piston I would never disturb the finish that the manufacturer has spent thousands of $ on R&D to determine the best finish for piston life and performance. Lastly as far as break in I have found the best performance and the best life out of running the engine through one heat cycle changing the oil & filter then warming it up untill the OIL is warm and then ride it like you stole it. Infact in my drag race engines I heat the oil with an electric oil heater before I ever fire it, feeling the engine for heat does not tell you if the oil is warm.
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  #26  
Old 02-07-2003, 02:21 PM
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Thumbs up Re: Break in procedure

Good info tc66nova!

Also, wanted to say welcome to ATM (all things moto)!

Hope you decide to stick around, and post often!
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  #27  
Old 02-08-2003, 02:49 AM
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Default Re: Break in procedure

Welcome to ATM tc66nova

Where abouts in NE Ohio are you located? I was in Mt. Vernon about 8 Months ago, working for Rolls-Royce. Nice Area.

Anyway, thanks for the info. I think you are dead on there.

Oh, and can I say that your Birthday is the best day in the entire year.

From the look of your mods looks like you are buddy or relative of James?
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  #28  
Old 02-08-2003, 07:47 AM
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Default Re: Break in procedure

03 CRF450

Thanks, but no I don't know nor have I ever met James but I have been Building motors for a long time and I can usually see the reason behind new ideas and recognize what works and what doesn't. I think ATM is a great site and check it almost daily. Sept 15 is a pretty good day, have you ever noticed how many great minds were born in Sept? Just look at you and I LOL.
As far as where in northeast Ohio I am about half way between Cleveland and Akron in a really small rural town named Hiram. Except for the cold winters I think Ohio is the greatest place in the world. Thanks for the welcome, I hope that I can help a few on this board and learn some things myself.

Terry
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  #29  
Old 02-09-2003, 04:36 AM
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Default Re: Break in procedure

Right on. Ya, after reading the power now thread, I see that you aren't. So my bad.

I'd have to agree about Sept. Very good month for smart people to be born. Now if I could just ride
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  #30  
Old 02-10-2003, 03:03 PM
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Unhappy Re: Break in procedure

Quote:
Originally posted by Woody_CRF
Right on. Ya, after reading the power now thread, I see that you aren't. So my bad.

I'd have to agree about Sept. Very good month for smart people to be born. Now if I could just ride
I have to agree with you on this one!!!
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