OzVMX Forum

Clubroom => Bike Talk => Topic started by: Nipper on May 20, 2012, 07:35:51 pm

Title: RM 125 crankcase swap
Post by: Nipper on May 20, 2012, 07:35:51 pm

Is it allowable to use RM 125C crankcases on a RM 125B motor and still comply the bike as a pre 78 ? I have had a look at Alpha sports web site and the part numbers for the B and C crankcases are the same.
I am currently rebuilding a motor for a RM 125B and there is some damage to the cases , so i thought i would use the C cases, is this a no no ?

Title: Re: RM 125 crankcase swap
Post by: crs-and-rms on May 20, 2012, 07:58:28 pm

i bought a nos set of 125 b cases and they didnt have any serial numbers on them

Title: Re: RM 125 crankcase swap
Post by: Doc on May 20, 2012, 08:16:34 pm

Theoretically the C engine in it's entirety should be deemed a legal 'flow on' having no major changes when compared to the B. Emphasis on the word 'should' ;) 

Title: Re: RM 125 crankcase swap
Post by: Nipper on May 21, 2012, 06:40:04 pm

Cheers Doc,maybe i will  just use them and beg forgiveness afterwards  wonder if that will be ok ?

Title: Re: RM 125 crankcase swap
Post by: Doc on May 21, 2012, 09:04:06 pm

sounds okay by me..but then so do lots of things that don't conform :D nothing a file wouldn't fix ;D

Title: Re: RM 125 crankcase swap
Post by: Nipper on May 22, 2012, 12:31:36 pm

Mmmm , I do some of my best work with a file. ;D