you would be wise to take the suspension off it is far better than the R stuff ( i speak from experiance) get them both rebuilt by someone like K-tech and you are laughing.
i dont know exactly how to do the clutch conversion but i do know that it will require the gearbox and sundries from the SE.
Stephen RC45 has done this conversion on his 18......and on his drivewaay to i would imagine.
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MC21SP - Roth-tax
CBR400 - track
MC21R - sold
MC21SP - sold