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Cylinder is the same part number from 02-08 on the crf450x and crf450r . So that can swap too. I think the quad is the same too

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Cylinder is the same part number from 02-08 on the crf450x and crf450r . So that can swap too. I think the quad is the same too

HELPFUL HINT #1

If you are going to correct someone's post for inaccuracy, it's helpful to do your homework first and actually be correct.

In this case that would have saved you from being WRONG.

The X cylinder is entirely different from the R cylinder. The part numbers are different as well.

The X cylinder contains the transmission vent feeding up through and coming off the backside of the cylinder.

The R cylinder does not as the R vents directly through a port on the engine case.

Using an R cylinder on an X bottom end will result in NO transmission vent and an engine that will blow seals immediately.

They are NOT interchangeable.

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HELPFUL HINT #1

If you are going to correct someone's post for inaccuracy, it's helpful to do your homework first and actually be correct.

In this case that would have saved you from being WRONG.

The X cylinder is entirely different from the R cylinder. The part numbers are different as well.

The X cylinder contains the transmission vent feeding up through and coming off the backside of the cylinder.

The R cylinder does not as the R vents directly through a port on the engine case.

Using an R cylinder on an X bottom end will result in NO transmission vent and an engine that will blow seals immediately.

They are NOT interchangeable.

So, you are saying that is a bad thing? :bonk:

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