Page 1 of 1
Relining a Rapido 250
Posted: Fri Apr 09, 2010 6:46 pm
by corrado
Mates fecked his Rapido 250 big style, lost a gudgeon pin circlip down the barrel.
Can it be sleeved smaller, say 70mm?
Can't see why not.
Re: Relining a Rapido 250
Posted: Fri Apr 09, 2010 6:50 pm
by sean brady scooters
that sounds like an improvement to me...
Re: Relining a Rapido 250
Posted: Fri Apr 09, 2010 6:56 pm
by cezeta
why would you want to sleeve it smaller?
Re: Relining a Rapido 250
Posted: Fri Apr 09, 2010 7:02 pm
by corrado
cezeta wrote:why would you want to sleeve it smaller?
So that next time it goes bang he can rebore it. The pitfall of a 250, no oversizes.
Re: Relining a Rapido 250
Posted: Fri Apr 09, 2010 8:10 pm
by joespeed
corrado wrote:cezeta wrote:why would you want to sleeve it smaller?
So that next time it goes bang he can rebore it. The pitfall of a 250, no oversizes.
oversizes are available ,but i can imagine the depth of the grooves left by the circlip!
Re: Relining a Rapido 250
Posted: Fri Apr 09, 2010 9:49 pm
by corrado
Yes, just noticed that AF do a 72.4mm piston, but the barrel damage looks terminal in the pics he sent me.
Re: Relining a Rapido 250
Posted: Sat Apr 10, 2010 9:15 am
by tavspeed
i'm sure one of the specialist 2-stroke engineers will be able to sort you out, pjme engineering comes to mind,i am running rapido 250,and seized it at 300 miles,cleaned piston and bore up and seems ok.how many oversizes do af do on this kit,also could i put a 200 barrell back on the casing,bearing in mind the neck has been machined larger,does the spigot need supporting by the neck,the spigot on a 200 barrell seems pretty strong,cheers all.
Re: Relining a Rapido 250
Posted: Sat Apr 10, 2010 12:34 pm
by carlos fandango
Ive just sleeved a RB250 down to 71mm at pjme (£140) with a MB piston and lowered port timings at the same time. In a Quest for more torque only done 30 miles
so far so not run in yet.
Re: Relining a Rapido 250
Posted: Sat Apr 10, 2010 10:51 pm
by Knowledge
Carlos,
That sounds like a very sensible idea. That might be a very wisely spent £140.
Let us know how it performs please. I am sure there are others who would be interested in the performance of a de-tuned RB250.
Martin
Re: Relining a Rapido 250
Posted: Sat Apr 10, 2010 11:25 pm
by carlos fandango
Knowledge wrote:Carlos,
That sounds like a very sensible idea. That might be a very wisely spent £140.
Let us know how it performs please. I am sure there are others who would be interested in the performance of a de-tuned RB250.
Martin
Will do
Its a 240, 60/110 alpha crank, 71mm, mb piston,jl3, 35tmx (which ill be changing to a 30mm) linner has been left 2mm higher than the gasket face and the head has been recessed to fit over it. Exhaust is 180 deg and trans 125 deg.