RB250 Super Tourer Engine/Exhaust - 30bhp - 23ft-lbs

[drunkmunkey6969]

I built this engine a couple of months back, and have been waiting for the customer to finish his paint/build so we can get it back and on the dyno, which happened today.

The breif was to strip his old engine, and then provide whatever new parts were required to build a nice, user friendly touring machine, with a bit of 'oomph' at the top-end. I can state that 'oomph' is in fact a technical term, i assure you

The customer owned a couple of scooters 'back in the day' , i believe one was a Webster Tune, the other an MB tune, and so coming back to scooters he wanted something fruity - but friendly (and I don't think he meant Dale Winton!). So i did this RB250 for him, it pulls very strongly from just over 4000rpm, and peaks at just under 8000rpm, with a tad more on over-rev should he ever need it. Peak power is whisker under 30bhp, with 23ft-lbs torque. Job done, happy customer.

Customer: Simon Ancliffe

Parts Required:
RB250 Kit Inc Cyl Head
62/116mm Race Crank
Delly Carb
Franspeed Super Tour pipe
6 Plate Clutch
Jap Race Bearing pack Inc Rear
Hi-Spec Race Chain
Front sprocket
Cylinder Studs/nuts/washers
Packer Kit
Mid Flywheel
BGM Stator

Work done:
Strip back to bare casings, clean, inspect, and machine/lathe as required for 62/116 - 250cc engine. Port cylinder and casing to suit customer requirements. Build engine up to Scooterotica Spec, using new components, setting gearbox shimming, clutch free play, crank web clearance, ignition timing, port timing, squish and comp ratio to desired spec.

Details:
Ign Timing: 17 Deg BTDC
Tr: 129 deg
Ex: 188 deg
BD: 29.5 deg
30bhp
23ft-lbs
Main Power range 4250rpm – 7850rpm

RB250 by Scooterotica Scooter Garage, on Flickr

image by Scooterotica Scooter Garage, on Flickr

image by Scooterotica Scooter Garage, on Flickr

image by Scooterotica Scooter Garage, on Flickr

image by Scooterotica Scooter Garage, on Flickr

[Den 08]

liking that a lot, nice work,
that last pic looks like that could be some Italian garage what with that sunshine

[eden]

Not bad Dan, I don't have the balls to go higher than 16 degrees static ignition timing with todays fuels, what head comp does it have?

[Adam_Winstone]

^... like (motor and Eden's comment)

[drunkmunkey6969]

I use the AF lo-comp heads on these tour set-ups, and the Ron Moss heads on the 'Fast Road' setups.

[cartmel808]

Nice motor Dan ..... and cool shot of the garage too!

Those scoots look lovely lined up in the sunshine..... especially that Vespa on the right

[martints1]

...do you use the "RB-Tour"-exhaust or the "RB-Supertourer"-exhaust ? thanks

[drunkmunkey6969]

SuperTourer

[drunkmunkey6969]

Topic moved