Well I'm trusting Rich Llewelyn knows how to turn out a good road engine. Itching to ride it even more now. Bring on some dry weather.
I once built an engine (as a 750) leaving off the flywheel entirely, i.e. just leaving the alternator and the starter clutch hub in place (the ignition was taken from elsewhere). It made for an exciting ride, with rapid spin-up and instant throttle response. Idling had to be high, and prone to stalling. It was a fun experiment, easily reversed so glad I tried it; not sure I would recommend it for general use though.
That story makes me remember when I geared my OWO1 to a flat out speed of about 85mph . It was almost unrideable in the first 3 gears and was trying to kill me all the time in the next 3 .
The next thing it got was an exup engine and turned totally track . All good fun when you're young enough not to care.
Having never ridden a BMW boxer twin I would imagine it's mainly down to the higher compression? but BMW may have an even bigger flywheel mass also? Don't know quite how the firing sequence; 90/270 degrees rather than the regular 180 degree of a BMW might affect engine braking?
Lightened flywheel, fitted and new impeller. Had trouble fitting the acquired impeller until I realised that the shaft/pump seal was different.
