I'm looking at this engine and noticed there is 5 diff part numbers. Ipretty sure i need either a 2104 or a 2105 can anyone tell me which one will drop right in a mt2. Thank you

Its 2104 that u want mate, it will drop straight in. Use the Cen clutch setup and pipe - unless u fancy one of OSs own pipes, I have the T1030, and its a jump up from the Cen pipe in performance.

Its a great little motor, good choice man.

thanks poor judgement you are a big help

Just to confirm with on this one which one would I need for my ST2
4531028003927 OSMG2003 OS 12 TR BB w/10J Carb
4531028004955 OSMG2100 O.S 18 CV-R P w/11G Carb
4531028004832 OSMG2105 O.S 18 CV-RX s w/11J Carb
As my LHS has all 3?

Cheers!

I am not sure if either of those will fit. See if they have the OSMG2104 O.S. .18 CV-RX w/11J Rotary Carb. I think this is the one you want. The 's' in the 2105 is the short shaft.

Its the OS .18 CV-RX 11J you want.