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Run-in Period XR250R

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I am not sure that I like this approach. I would much rather have some level of break-in period. I know that modern bike can handle it and in some cases it makes the engine more resilliant and powerful. I practiced the theroy with my new CBR600RR back in 2005 and I scrubbed the tyres in and thrashed it senseless:ride: The engine was fine and was a great runner up to 27000 when it was stolen in 2007. I would like to know what the people from this forum have done in the past when completing a top-end rebuild.

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I have been using the mototune method for some years, works good for me.

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Try the heat cycle method run upto temp then let it cold. Do this upto three times and then go for a gentle ride. then you should be good to go. This is how i do all my motors and o problems yet hope this helps.

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I will try this, I suppose the worst that can happen is I need another piston which is £80 with rings. Do any of you use car oil, or do you use your normal synthetic motorbike oil?

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I am breaking my new piston in this way. Use a non synthetic motor cycle oil or motor oil without "energy conserving" friction modifiers. I am using Shell Rotela for the break in.

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I was advised by an engine builder to use any oil for the first heat cycle, then drain and use Torco 20W-50 for break in and there after for best engine life. Since they build road race engines I thought the advice was good for dirt riding.

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