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Old 11-30-2012, 07:42 AM   #1
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Default CRF 250 X Engine

Has anyone tried to put a CRF 250R or CRF 250X engine in a CBR 250R?
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Old 11-30-2012, 08:47 AM   #2
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I've got One question... WHY?
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Old 11-30-2012, 10:02 AM   #3
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Where would you find an engine? It's not like a lot of people are parting out CRF250X & R motorcycles. Late model used CRF's sell for as much, or more than a new CBR250R. Doing an engine swap would not be cheap, even if you could source an engine. It wouldn't be a direct swap, so there would be a fair amount of fabrication work.

Or you could put your money toward something like a CBR500R.
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Old 12-03-2012, 07:43 AM   #4
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The reason I am asking about a CRF engine is as an alternative to a Moriwaki 250. As you know a Moriwaki 250 has a CRF X or some are putting in a CRF R engine. A new Moriwaki cost about $11k and in 3 or 4 years it will be worth about $7k. An RS 125 2 stroke puts about 35-40hp which is about what a CRF engine puts out but, the CRF has a lot more low end torque. My son is currently racing an RS and I would like to move up to a 4 stroke and I thought buying a CBR to start with would get him use to a slower 4 stroke and then the possibiltiy of putting a CRF to get his speed back up to that of the RS would be a good stepping stone. If the CRF engine would fit, he could run it for a few years then put the CBR enging back in and sell it in either race or street trim. Spending $3k on a CRF engine is pretty cheap when you add up the cost what it takes to keep an RS running.
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Old 12-03-2012, 08:22 AM   #5
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11K?! That to me sounds like an extravagant amount for 35-40 HP, better to spend half of that and get closer to 50HP in a CBR500R, no?
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