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Whats this RB barrel?
Posted: Thu Dec 10, 2009 11:51 pm
by carlos fandango
Picked this barrel up recently, and im a bit puzzled as to what it is.
Is is unused, RB225 ports, but is 72mm bore, the spigot is 78mm and not stepped like the rb250s so very close to the stud holes
The spigot is as cast not welded or anything?
so what do you reckon?
Re: Whats this RB barrel?
Posted: Fri Dec 11, 2009 6:50 am
by odd mod squad
hello there
you will find its a very early one
if i remember correctly jb tunning used to machine and step the barrels and mod the piston
has anyone got a 250 new or old
and any feed back on their pros and cons
happy days
Re: Whats this RB barrel?
Posted: Fri Dec 11, 2009 9:58 am
by eibargum
Looking at the inlet it looks like a RB22 as the only 25s ive seen have had two fingers in the inlet to support the rings, unless like odd mod says its a early one and they changed them, if its got a number on you could ring Kempy up as they keep records
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Re: Whats this RB barrel?
Posted: Fri Dec 11, 2009 10:32 am
by carlos fandango
Well it is an early one number 27
Re: Whats this RB barrel?
Posted: Fri Dec 11, 2009 2:43 pm
by RobD
If it's an early one then I believe the port timings will be for a 58mm stroke crank. I've got one the same and had the barrel top and tailed for 58mm stroke. A bored out RB22 effectively. Alternatively could machine to suit 60mm stroke as taffspeed did.