MB Inlet RT225 Reed

Not only do we do the MBgm Race-Tour cylinder kits going out pre tuned with a 28/30mm MB inlet manifolds matched and flowed bolted on. Here we have a customer who's just returned from the French Euro and realised he needed more power for the Swiss Euro a year later.

I took a phone call with some questions about the RT kits modified for Reed Valve. Now, if your right with me I'm right with you, not only did we talk Scooters and the Euros we've both been on but I could give advice to the super roads over to Davos in Switzerland as I've been a few times on the big bike. So I had a clue to what type of Scooter engine is needed to climb these massive mountains.

Really all you need is a very torquey engine which the RT kits are. Add a reed valve and the extra tuning and things improve on the pulling side. Not only will they pull the steep endless passes but they will storm down an autobahn at speed pulling high gearing. And not only will they do that but they will give better fuel economy over other cylinders making a long trip abroad a fun experience!

A day later the order was placed and I did the tune and mods to a new kit and was posted the same day! I think that's service for you?

And cylinder tune MRB1734, who's done more?

MBgm Race-tour 195
MBgm Race-Tour 225
MB shorty reed assembly
MB tuning to an alloy cylinder


Fit two studs in the inlet port and offer up the MB shorty Reed block and scribe where the fins need cutting


Grind the fins and keep offering up the reed block until it seats on the gasket face


This is the amount of fins which need removing


Boost ports need marking out to suit the ring peg positioning


Finish tuned and flowed into the inlet port


The new MBgm Race-Tour forged pistons which come with the new RT kits,


A MBgm full skirt piston modified for reed tuning


MB shorty Reed block, opened, matched and flowed to the inlet port


Sand casting surfaces cleaned and flowed where it's needed


Inlet port opened out


Inlet port lowered and shaped to the reed assembly


Reed boost port cut into the cylinder, which is very important, transfers cleaned up but not tuned


Rounded inlet shape for reliability


Port edges chamfered along with the transfer cleaned up


Transfers cleaned up and dingle berrys removed


Clocking up some cylinder kits now!

Mark Broadhusrt 4.7.2013 if you have any questions ask mark@mbseriousoutdoors.co.uk