R/C Tech Forums - View Single Post - Mugen Ninja JX21 B01A 5-Port Off-Road Competition Buggy Engine (Light Weight Head)
Old 07-16-2010, 03:25 PM
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it's easy. Just watch your temps and don't stress the rod. In other words, use a heat gun and be gentle for the first few tanks. I break mine in a little leaner then the factory settings.

you should be able to put a race tune on it after a little more the a quart of fuel. I used to drag it on for a gallon etc, but i find the shorter, less lengthy break in is better, saves time, money and wear on your engine!
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