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engine break-in?

This is a discussion on engine break-in? within the Engine forums, part of the Technical category; Well fellas..... I finally finished rebuilding my 660 into a 686 and have rejetted the carb with a 170 main and a 55 pilot for ...


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Old 02-27-2013, 08:09 PM
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engine break-in?

Well fellas..... I finally finished rebuilding my 660 into a 686 and have rejetted the carb with a 170 main and a 55 pilot for a baseline. Now the question that I have is how long should I let the engine idle for the break in period? Or what is the recommended practice for breaking in a new rebuild? I do not want to do any harm to the engine. Any and all advice will be helpful, Thanx.
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Old 02-27-2013, 09:07 PM
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Drive it.for break in..

Accelerate alittle then let it engine brake.. accellerate alittle more throttle more rpm and let it engine brake.. reapeat till your going wot. Or just run it wot and let it engine brake.... for break in run the heck out of it

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Old 02-27-2013, 09:21 PM
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Start and run around 1800 Rpms till motor warms up. Let cool all the way cool then repeat 3 times. Then you can drive it. This will make sure the rings get set in good......
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Old 02-28-2013, 06:16 AM
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I like to give it a full throttle rev up (don't overrev or hold it long) just up n down up n down. gonna set the rings in real good. I do 3 full heat cycles this way, then ride it like you stole it. just did a CRF450R like this last week and the dam thing rips! same gearing and has an extra 3-4 mph top end guess I need to freshen mine up lol
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Old 02-28-2013, 07:30 PM
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Allow the engine to warm up completely and then drive it like you would normally do........
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Old 03-01-2013, 08:01 PM
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Dont use synthetic oil for break in use mineral oil
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Old 03-02-2013, 05:52 PM
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Use the oil you always will use.
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[/SIGPIC]2005 Rhino, 686cc, Ferrea valves, 3 plughead, dual FCR 35mm carbs, Dual exhaust, ported head, Engine oil mod, Carrillo connecting rod on balanced crank assembly, Dyna FS ignition programed to the three plug heads requirement, overdrive weights, JBS machined sheave. Cold air intake with 4'' tubing, Dual cooling rads with fans.................
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Old 03-02-2013, 06:22 PM
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Quote: Originally Posted by Mike Hunt View Post
Dont use synthetic oil for break in use mineral oil
You run mineral oil in your rhino?? Don't you drink that when you can't ****?? Lol!
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Old 03-02-2013, 07:10 PM
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Quote: Originally Posted by willykiller View Post
Use the oil you always will use.
As noted earlier no synthetic.
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