I thought the cam follower breaking up and the resulting fragments was the real culprit? Naturally, that severe cam follower wear could be oil related. Voxan had trouble with the cam chain guides on the 1000 engine and Motul developed a special 15w-50 (Voxan) oil for them or they recommended Castrol 10w-60. They were both full synthetic though. I'm not quite sure why a mineral oil would be considered superior just because that's all you could get when Morinis were state of the art, but I do wonder if a -50 would be better than -40 in arduous conditions. I just changed the oil on the 350 'racer'. The Halfords 10w 40 semi-synthetic had done eight runs up Hartland, six round Curborough and one up Loton, as well as about 50 miles of 'running in' installed in the road 2C. Looked fine and I was encouraged to find not a trace of any nasty bits on the filter. Motul 15w-50 semi-synthetic has gone in now. I now see that an Amazon seller states: "Not compatible with Morini, Quad, MV Agusta F3, MV Agusta Brutale 675 - 800, Harley Davidson filters." - but I assume that means the 1200s - though no idea why - though I'd only be putting full synthetic in a Corsaro. I even put full synthetic Castrol Power 1 in the ER6n. Then I was used to changes after just a few hours on the KTM and Yamaha MX thumpers and a strict diet of Motul full synthetic.pedro wrote:I took the crank, which has some pretty serious wear on the big-end which went (front) up to Nourish engineering which is near me, The owner, Chris Bushell of Moto Giro fame and a huge Italian bike fan, immediate reaction, with absolutely nothing said by myself, was "the oil has broken down" he ran a Morini himself for five years, for the kind of use mine gets, he is suggesting Valvolene 20/50 mineral oil. That's two people suggesting that the problem is down to oil, I certainly won't be going back to Halfords oil myself. It looks like the crank will be going up to SEP engineering in the midlands for underwater welding to bring it back to standard. Conjures up a lovely picture of a bloke with welding gear and a snorkel in a swimming pool, perhaps it's just me.
Heh! An oil thread <opens popcorn>