Engine options

[Meds]

It really depends on how much you want to spend and how much needs done to make the engine fit for purpose.
All of the kits will at least double the power output of the engine.
If you don’t want to do much the the casa kit can be run with a clubman exhaust and a 22 mil carb - I’ve a mate who did it successfully using points. (I believe the scootopia kit is similar but I’m sure someone will give more info on that) and it wasn’t a slouch
After trying to get a standard 150 running right I gave up and bought a complete RT set up which nearly tripled the power - but that’s kit-crank-carb- exhaust + sundries and is the think end of £1k- there are faster and more powerful but it really suits the way I ride.

Read MB Tech site on the RT-
Search on here about the casa kit/rt/gt kits.
So far the Biggest downside with the casa is piston replacement - repairing a kit is as expensive ( again I’m sure someone has done it successfully)
They all have their pros-cons, fans and detractors.
Good luck

[Warkton Tornado No.1]

I'll come in with a vote for the RB20- road and race proven, very reliable kit, very reasonably priced, here's a few in action at 3 sisters race track
https://www.youtube.com/watch?v=Cao6xTRerHw

The RB range of kits are very good @ what they do, but are fierce by their nature. They can be detuned to attain a more 'civilised' engine, as I am sure Ben @ Rayspeed will attest, but that does involve further costs.

I doubt it will ever happen, but were there a rule change in the "Production" class in the BSSO to allow other Lambretta kits (say, like there is with the Vespa) then the MQ would be the natural choice, I would wager......

The MQ has standardish geometry, meaning the carburettor can be where it should be, & doesn't require it's neck wringing to simply ride it. Very much an all-rounder that should suit the majority of scenarios, & there is bound to be even greater potential when other established tuners get their grubby mitts on them & experiment with the exhaust in particular.

(*Currently, a large block engine I am working on had the owner stipulate that he wanted to 'revert' to TS from RB because of the nature of the power delivery, & he rides everywhere as if he has stolen his own bike)

[rossclark]

Does the MQ kit also require a specific exhaust?

[corrado]

Does the MQ kit also require a specific exhaust?

Yes due to the angle of the exhaust port, and currently there isn't much choice.

I have an RB20 that was built for sprinting but it will happily ride around time with no issues. I had to use it as part of a funeral procession, as my normal road scooter was out of action, and was expecting it to not want to trundle about at low revs but was pleasantly surprised.

I'm currently (very, very, slowly) building a Quattrini engine and the most noticeable aspect of the kit is it's ability to run much taller gearing than the RB, even in race guise. I suspect that the Quatt will be a game changer given another year of experience of it and more available exhaust options.

[dscscotty]

The tendency for RB's to be known as a revvy kit is as much down to the pipes available as the port timings, they can be a good touring set up if tailored that way, our production class RB 20's run quite tall gearing considering their required use, this is mainly down to the wide power band and the torque available from the pipe used,