OzVMX Forum

Clubroom => Tech Talk => Topic started by: Nipper on November 30, 2012, 04:59:32 pm

Title: RM 125 cylinder
Post by: Nipper on November 30, 2012, 04:59:32 pm
I have a rm 125 b cylinder that is now at 56mm this is 2mm over the original and it is not looking pretty down there.
I am thinking of getting it resleeved so as to start with a standard piston. Is this the best way to go ,or should I just look for another barrel? Any thoughts .Cheers Nipper
Title: Re: RM 125 cylinder
Post by: oldfart on November 30, 2012, 05:33:02 pm
Are you cashed up ....
http://www.ebay.com.au/itm/SUZUKI-CYCLINDER-BARREL-11210-41310-RM125B-C-/160864592111?pt=AU_Motorcycle_Parts_Accessories&hash=item257446e0ef
Title: Re: RM 125 cylinder
Post by: Canam370 on November 30, 2012, 05:45:51 pm
I have a 125B engine with electrics I'll part with- no piston but the bore looks OK and the bore measures 54mm. PM if interested for details.
Title: Re: RM 125 cylinder
Post by: oldfart on November 30, 2012, 05:53:43 pm
I'll swoop on it if he is not interested.
Title: Re: RM 125 cylinder
Post by: Lozza on November 30, 2012, 07:53:12 pm
I have a rm 125 b cylinder that is now at 56mm this is 2mm over the original and it is not looking pretty down there.
I am thinking of getting it resleeved so as to start with a standard piston. Is this the best way to go ,or should I just look for another barrel? Any thoughts .Cheers Nipper

You can Nicasil over cast iron would cost the same as the NOS cylinder.
Title: Re: RM 125 cylinder
Post by: bigk on November 30, 2012, 10:34:01 pm
Use an Elsinore piston. 56-58mm should be plenty of cylinder to bore that far.. You'll have to do something about the increased compression unless you can get some better then pump fuel.
K
Title: Re: RM 125 cylinder
Post by: Bamford#69 on December 01, 2012, 12:42:28 pm
Hi,
If  you use an Elsinore piston 56-58mm, remember GCR rule 12.4.5.1 page 92, Engine Capacity Tolerances, Classic Motocross 5% permitted excess (bore/engine size).
cheers
Title: Re: RM 125 cylinder
Post by: firko on December 01, 2012, 05:39:54 pm
Quote
If  you use an Elsinore piston 56-58mm, remember GCR rule 12.4.5.1 page 92, Engine Capacity Tolerances, Classic Motocross 5% permitted excess (bore/engine size).
;D ;D ;D ::)
Title: Re: RM 125 cylinder
Post by: vandy010 on December 01, 2012, 06:07:25 pm
Quote
If  you use an Elsinore piston 56-58mm, remember GCR rule 12.4.5.1 page 92, Engine Capacity Tolerances, Classic Motocross 5% permitted excess (bore/engine size).
;D ;D ;D ::)
^^^
what he said ;D ;D ;D ::)
Title: Re: RM 125 cylinder
Post by: Nipper on December 02, 2012, 02:03:34 pm
Thanks guys for your input with the rm cylinder it has been great. Canam370 has come to the rescue with a spare parts motor to help fix the situation. Cheers Nipper.