RB20 fitting problem!!

[kevspeed]

Helping a mate out,putting together an RB20 engine,anyone had problems fitting this kit??
Problem 1,The barrel wont slide all the way down onto the gasket face,even tried on a different set of cases,it stops about 10mm short.
Problem 2,Cant get the piston into the bore much past the rings.The Piston is marked 65.79,is this correct?
Problem 3,The centre of the 'cassette' clutch doesnt seem to want to fit in its hole,any ideas?
Just thought i would ask here first before contacting the dealer and being told '''we've never heard of this problem before''.

[10 inch Terror]

http://scooterotica.org/forum/viewtopic.php?t=28920
This may help with the tight barrel issue.

[kevspeed]

Thanks for that,problem sorted,i just have to find out why the piston wont go in the barrel properly!!
This is as far as i can get the piston in!!

[Spanish Fly]

i just have to find out why the piston wont go in the barrel properly!!
This is as far as i can get the piston in!!

Will the piston go into the cylinder when unassembled? i.e. just the piston and the cylinder? No rings, no con rod, no crankcase.

SF

[kevspeed]

Yep,just way too tight with the rings fitted!,rings on their own,no problem,piston on its own no problem!

[fairspares]

have you put the rings in the barrel and checked they have the correct clearance?

http://www.lambrettaspares.com/info/set ... -+163.html

[carlos fandango]

I've posted on lcgb for you.......
Basically the rings will catch on the fingers of the boost ports

[kevspeed]

have you put the rings in the barrel and checked they have the correct clearance?

http://www.lambrettaspares.com/info/set ... -+163.html

Got to be fair!,that link was a very interesting read,we will be having another go at the RB in the week,with the info in that link taken on board!

[soosh]

Thanks for that,problem sorted,i just have to find out why the piston wont go in the barrel properly!!
This is as far as i can get the piston in!!

So the studs were causing the barrel not to slide down fully?

[kevspeed]

DONE!!,basically a combination of odd thin/fat studs,and the stud holes catching on the last couple of threads.Ive now drilled out the bottom of the barrel stud holes to 9mm.