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| CR125 top end on a MR175 Bottom end https://vintagedirtbikeforums.alp-sys.com/viewtopic.php?f=21&t=1710 |
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| Author: | burkemotorcross [ Tue Jan 08, 2008 12:20 pm ] |
| Post subject: | CR125 top end on a MR175 Bottom end |
I remember reading that this was possible. what is all required to perform this swap? do i use the CR125 crank or the MR175 Crank? |
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| Author: | Elsinorestuff [ Wed Jan 09, 2008 10:01 pm ] |
| Post subject: | Re: CR125 top end on a MR175 Bottom end |
I do not think a CR125 will fit an MR175 bottom. The MR175 has long mounting studs that hold the cylinder and the head on and are not mounted in a square pattern. The CR125s cylinders mount with short studs that only hold on the cylinder. Maybe if you removed the long MR175 studs it might work. Anyway you would need the CR125 crank since the MR175 uses a bigger pin for the piston. |
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| Author: | cr399 [ Sun Jan 13, 2008 10:07 pm ] |
| Post subject: | Re: CR125 top end on a MR175 Bottom end |
No, this swap out does not work. Why bother anyways, just build either or? If you're trying to build a cheater bike you'll be snuffed out immediately, but if for fun then just build the MR175 motor with CR125 like porting and CR 125 gearing. |
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