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o.s .25xz break in procedure

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Old 02-19-2011, 07:11 PM
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mx51
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Default o.s .25xz break in procedure

I was wondering what the o.s recamended break-in procedure for an o.s .25xz is? I have 20 different people tellin me 20 different ways,but want to do it the way o.s recamends, and the owners manual wasnt very clear on this subject....
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Old 02-21-2011, 07:09 AM
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Default RE: o.s .25xz break in procedure

You drive the car. Keep it leaned just below max RPM and drive the car at varying speeds, up to full and down again. Gradually work the high-speed needle towards peak RPM. If you can accelerate up to speed and the RPM will hold at full throttle, you have the mixture OK. If it accelerates up and sags, it's too lean.

Anyone who claims to break in an engine by idling it for a few tanks' worth is not breaking in their engine, but breaking it. It won't last very long if you do that. The engine must be run under load.
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Old 02-21-2011, 07:41 PM
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Default RE: o.s .25xz break in procedure

How many tanks do i do that for till it is ready to hit the track?
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Old 02-22-2011, 06:55 AM
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Default RE: o.s .25xz break in procedure

When the engine runs consistently with a good top-end, good idle, and good throttle transition, you're ready to go. There's no specific number.
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