OzVMX Forum

Clubroom => Tech Talk => Topic started by: John Orchard on August 01, 2012, 03:34:34 pm

Title: RM125 what are these parts?!!!!
Post by: John Orchard on August 01, 2012, 03:34:34 pm

Hey Guy's, I have come across a couple of head & barrels to suit RM125, either A,B or C  BUT the strange thing I find is, firstly the barrel has a T shped exhaust port (where the stock A,B,C is square) and an 'un bridged' intake port, unlike all other RM125 A, B orC's I have ever seen.

Secondly, the cylinder heads have a factory squish-band !!!!

What could these be off?!!

I'll get a couple of pics soon.

Title: Re: RM125 what are these parts?!!!!
Post by: jerry on August 01, 2012, 03:38:53 pm

Gaston Rahiers RA125? J

Title: Re: RM125 what are these parts?!!!!
Post by: TM BILL on August 01, 2012, 04:03:41 pm

Sounds like a stock RM 125A set up  ;) T shape exhaust port , unbridged intake port 56mm std bore and different sqish in the head to B and C models  :)

Title: Re: RM125 what are these parts?!!!!
Post by: TM BILL on August 01, 2012, 04:07:48 pm

Does it have provision for the case reed ? if not it could be RM 125S or RA 125 ;)

Title: Re: RM125 what are these parts?!!!!
Post by: John Orchard on August 01, 2012, 04:47:13 pm

Come on Bill, I know my ABC's ;-)  Yes, case reed/piston port!

Title: Re: RM125 what are these parts?!!!!
Post by: John Orchard on August 01, 2012, 04:50:02 pm

The cylinder's are 56mm, they could be standard bore A models.  I always thought A barrels had a bridged inlet, ok I guess that explains the barrels but I know A heads do not have a squishband.

Title: Re: RM125 what are these parts?!!!!
Post by: TM BILL on August 01, 2012, 05:53:58 pm

Quote from: John Orchard on August 01, 2012, 04:50:02 pm

The cylinder's are 56mm, they could be standard bore A models.  I always thought A barrels had a bridged inlet, ok I guess that explains the barrels but I know A heads do not have a squishband.

The 4 RM 125A heads i have sitting on the shelf with Squish bands must be specials then  ;)

Title: Re: RM125 what are these parts?!!!!
Post by: John Orchard on August 01, 2012, 05:58:48 pm

Oh ok then, hmmm, of all the pics of 125A heads on ebay, none have them have squishbands, they must be B or C heads.

You wanna sell a 125A head? I want to try a squishband on my B.

Title: Re: RM125 what are these parts?!!!!
Post by: John Orchard on August 01, 2012, 06:00:32 pm

(http://i1093.photobucket.com/albums/i423/JohnnyRacer89/nobridgeinletport.jpg)

(http://i1093.photobucket.com/albums/i423/JohnnyRacer89/Squishband.jpg)

Title: Re: RM125 what are these parts?!!!!
Post by: TM BILL on August 01, 2012, 06:04:27 pm

(http://i40.photobucket.com/albums/e204/tmbill/RMA001.jpg)

B head on LHS  A head on RHS   Would sell a head but might look odd as finning area is much smaller .

RM 125A Cylinder

(http://i40.photobucket.com/albums/e204/tmbill/RMA005.jpg)

(http://i40.photobucket.com/albums/e204/tmbill/RMA003.jpg)

(http://i40.photobucket.com/albums/e204/tmbill/RMA004.jpg)

(http://i40.photobucket.com/albums/e204/tmbill/RMA002.jpg)

RM 125 DG head

(http://i40.photobucket.com/albums/e204/tmbill/DGhead002-1.jpg)

(http://i40.photobucket.com/albums/e204/tmbill/DGhead001-1.jpg)

Title: Re: RM125 what are these parts?!!!!
Post by: John Orchard on August 01, 2012, 06:42:10 pm

Ahhhh thankyou Sir, that eplains my error  ;-)

I'd be cool to try an A head, if it works I'd blend the barrel fins to make it look ok.