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02 case fits 03 CR250R?

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Does anyone know if the 02 left engine case fits the 03 CR250R?

The Honda numbers are 04922-KZ3-L21 for the 02 and 04922-KZ3-L31 for the 03, so I recon they are interchangeable, but I'm not sure.

Thanks! :banana:

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I think 02 to 07 are the same, but odd there is a different part number, better safe than sorry

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I've always bought cases as a set, and always recommend it. Even though they are run on a CNC machine, there is no guarantee of the exact dimensions from year to year. This is the reason you have shims sometime on your main shaft and countershaft, so the gears mesh evenly and will not wear uneven. Keep that in mind if you do replace just one side case. Make sure you have a service manual that tells you the clearance's in the trans.

I think that crankcases are line bored too. At least I would hope they are. That means the halves are put together and then the machined straight through so that the bores on both sides line up evenly for the transmission shafts and crank shafts.

SK's $0.02 worth

Edited by STILL_KICKIN

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I think 02 to 07 are the same, but odd there is a different part number, better safe than sorry

I think they're the same too, and since there's only one number different in the last part of the Honda parts number, I think they'll fit. But I'll have to be sure. Problem is I can find several 02 cases on eBay, no 03 case.

I've always bought cases as a set, and always recommend it. Even though they are run on a CNC machine, there is no guarantee of the exact dimensions from year to year. This is the reason you have shims sometime on your main shaft and countershaft, so the gears mesh evenly and will not wear uneven. Keep that in mind if you do replace just one side case. Make sure you have a service manual that tells you the clearance's in the trans.

I think that crankcases are line bored too. At least I would hope they are. That means the halves are put together and then the machined straight through so that the bores on both sides line up evenly for the transmission shafts and crank shafts.

SK's $0.02 worth

You are absolutely right. This is for a friend who has a budget. Instead of letting his dealer order a new case he tries to find one himself cheaper.

The dealer will check the alignment of the cases and do the shimming, if necessary.

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I think 02 to 07 are the same, but odd there is a different part number, better safe than sorry

NEW FOR 2005:

* New cylinder design features RC exhaust valve housed in removable case for improved sealing.

* New precision-cut stainless steel cylinder base gasket and revised port timing .

* New cylinder head combustion chamber shape.

* New one-piece exhaust valve for improved sealing.

* New piston dome shape.

* New piston features single keystone piston ring for reduced friction and improved sealing.

* New crankshaft design.

* New crankcase with redesigned intake port for smoother air flow and increased journal thickness to decrease crank deflection.

* New six-petal reed valve with narrower profile.

* New reed valve mounting angle.

* New carburetor settings.

* New shift fork shaft, shift forks and shift drum.

* New ECU mapping and RC valve control settings.

* New exhaust pipe shape has increased volume.

* Thicker radiator core (from 24mm to 28mm) improves cooling capacity.

* New front axle placement for improved fork action and turning.

* New swingarm features a dual-axis, double-taper design with a large cast aluminum cross member that is lighter weight and stronger.

* New rear hub is stronger and lighter.

* New rear shock valving for improved bump absorption.

ENGINE:

* New exhaust header and expansion chamber.

New crank and cases for '05-'07 makes intermixing with the '02-'04 design questionable.

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Does anyone know if the 02 left engine case fits the 03 CR250R?

The Honda numbers are 04922-KZ3-L21 for the 02 and 04922-KZ3-L31 for the 03, so I recon they are interchangeable, but I'm not sure.

Thanks! :banana:

They changed the case porting from 02 to 03, so they won't be exact.

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