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Old 01-10-2014, 09:56 AM   #1
Jason_Canuck
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Break in Oil for Rebuilt Head?

Just had my head rebuilt on my CRF450X, basically valve swap, new seals, springs, seals, etc. SAME CAM. Do I need to run a conventional oil for break in or can I immediately go with the synthetic I have been using?
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Old 01-10-2014, 10:02 AM   #2
bluewave18
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Break in Oil for Rebuilt Head?

I see no need for break in with the changes you made
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Old 01-10-2014, 10:08 AM   #3
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agreed, run normal oil and have fun, break in oil/zinc is for cam and lifter surface wear-in
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Old 01-11-2014, 11:38 PM   #4
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Were pistons done? I'm only asking cause on automotives you need the break in oil and thicker conventional oil to help them seat right or else you'll get blow by, at least until you know the motor isn't burning oil anymore which you can switch to synthetic
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Old 01-12-2014, 08:49 AM   #5
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Unless u put new wrings on the pistons, then no need
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Old 01-12-2014, 10:09 AM   #6
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No piston, just head.
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Old 01-12-2014, 02:59 PM   #7
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I used to think synthetics are not good for break in, but plenty of cars are filled with Mobil1 ans such from the factory.

Now, I think the reason for using conventional oil for break in is not that synthetics are "too slick", but it would a waste to change it out after 500 miles. The early oil and filter change is important to get ride of particles left in the engine from the mfg or rebuild.
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