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       #Post#: 2291--------------------------------------------------
       Re: la grignoteuse de kilomètres
       By: randall Date: February 19, 2018, 8:27 am
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       Wow!
       This is an abnormal wear!
       Most likely due to insufficient lubrication;
       It must be taken into account that it could also be a material
       defect (incorrect hardness or wrong surface treatment) has
       already occurred in the past, and some cases are known
       #Post#: 2293--------------------------------------------------
       Re: la grignoteuse de kilomètres
       By: cloggy Date: February 22, 2018, 5:30 pm
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       I beg to differ. Having turned over the engine by hand with the
       rocker box covers off, great dollops of oil were being deposited
       on the ground; this  before  fitting the additional feed which
       also delivered an excessive amount  of oil by the same hand
       cranking. I expect the guides are worn, but since it wasn't
       using any oil, it wasn't a problem. And I don't believe excess
       guide wear causes valves to break since that was recorded as
       happening with brand new thin stemmed valves which also showed
       no sign of galling. Indeed the builder thought it was due to
       running the sort of  tiny clearances promoted by North Leicester
       Motorcycles. That may be fine for chuffing around at 45 on a
       touch of throttle  but not at speed. I think what happens is the
       massive pushrods expand a lot and hold heat longer than the
       castings. That holds the valve off it's seat leading it to
       soften and then break when the engine cools down sufficiently
       for it to start slamming into the seat again. I've run the
       engine for miles at 70+ [without realising it]  and taken it up
       to an indicated 78. The only problem being the ignition keys
       blew away....
       Oh and I got severe leg cramps after around 250 miles of mixed
       welsh roads so I got the saddle raised at the nose by 4".
       Didn't happen again after doing an all day orienteering event
       so that worked.
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