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Old 03-13-2010, 04:49 AM
Bikeguy Joe Bikeguy Joe is offline
Godfather of Motorized Bicycles
Join Date: Jan 2008
Location: up north now
Posts: 11,531
Default Re: Simulated Break In Period

Sure, they need the "heat cycling" of various throttle amounts to seat the ring. When on the throttle, you are putting more pressure on them than when off throttle. Also, part to full throttle produces more heat.

Also, believe it or not, there is a microscopic amount of stretch and some elongation of the crank at various rpm, so unless you are going to run your engine at one speed all the time, you'll want to vary the rpm during break in.

Here's the bottom line- if someone wants to let their engine idle for a few hours in front of a fan, instead of riding the bike, go ahead and do it.

Let us know how it goes, and how many plugs you foul.
How can you tune in an engine when it's sitting there idling?

You can't.
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