SX150 barrel on a LI 125 S1 Casing

[HartleyHare]

I'm after some advice please.
I have a S1 LI 125 frame breather which is very slow and needs running in.
Is it a straight swap to fit a SX150 barrel and piston which I've removed from a standard SX150. I also have standard carb from SX150 too.
Any advice from you guy's would be welcome.
Thanks

[Scooterslag]

Hiya, yes should be fine to swap over the top end and carb though might be worth replacing the crank, bearing and seals with a later li type as the early S1 set up had a weird arrangement with the lubrication of the flywheel bearing.Paul

[Knowledge]

Why not put the whole SX150engine into the Frammebreather? You can put the original engine on the shelf and save it for later.

[HartleyHare]

Thanks Paul and Knowledge.
I believe it had a new crank when restored by previous owner. I will leave mag side bearing as it is I think. I can't swap whole SX engine as it's in my SX with Mugello kit on it.
I'm just looking for a bit more power for summer then I'll rebuild S1 engine with a kit in winter.
Thanks