Break-in period after rebuild? - Page 2 - Yamaha ATV Forum
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post #21 of 26 Old 05-24-2007, 07:12 PM
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Quote:
Originally Posted by tommy
I've been around all types of engines for years and this does work. Ya an easy break in works too, but I personally feel this is better. I did this with my raptor and everyone I know that has seen and or ridden it can't beleive it's just a 686. I dont think you'd notice any big differnece on a low horsepower application but when it comes to trying to get everything out of an engine it's the way to go. You dont see top fuel cars doing an easy break in.
Top fuel cars are built far different then your regular old car or fourwheeler engine. .and there only rebuilt every race.

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post #22 of 26 Old 05-24-2007, 09:12 PM
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I heat cycle the motor a couple of times to give everything a chance to expand/contract and then give it hell. Rings don't seal right without an engine load, many people knew that that long before someone posted it on the internet.

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post #23 of 26 Old 05-24-2007, 09:44 PM
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Originally Posted by UBETRUN
I heat cycle the motor a couple of times to give everything a chance to expand/contract and then give it hell. Rings don't seal right without an engine load, many people knew that that long before someone posted it on the internet.
Yup!

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post #24 of 26 Old 05-25-2007, 07:49 AM
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How do the rings break into the cylinder walls? With cylinder pressure. The pressure actually goes in behind the compression rings and push them out against the cylinder walls. Like said, do a few complete heat cycles and don't baby it. I have never "broke an engine in" in my life and I've never had an engine failure. Your quad will effectively end up with better compression and yes, that makes them faster.
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post #25 of 26 Old 05-25-2007, 08:12 AM
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Top fuel cars are built far different then your regular old car or fourwheeler engine. .and there only rebuilt every race.

I was making an extreme example. Most 8 and 9 second cars do the same thing without the rebuilds.

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post #26 of 26 Old 05-27-2007, 02:43 PM
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That's good info. I'm gonna give it hell after my re-build.....not like I'd be able to wait to put the hammer down anyways!

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