 Engine lubrication was by oil pump to the crankshaft but no force lubrication went to the rocker gear.Instead, crankcase pressure forced oil mist up the short pushrod tunnels to the rocker covers, where two 'crow's feet' allowed mist to condense and drip onto the rocker gear.Although ingenious, it required riders to gentle warm up their engines before using maximum revs, redlined at 9,200 rpm.