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« on: May 11, 2019, 02:38:37 AM »
Ive looked at all the options ,main problem is the case is not very strong..........same as the rest of it.......Anyhoo,Im thinking the cheapest option is to make a new outer race,and skim the case bore just enough to round it up........fortunately the 22mm mainshaft is good......looks like it was replaced....................the rebuild with INA bearings is probably the best,but too costly........The main bearing is somewhat similar to a WLA part,similar dimensions ,and I could use WLA cages ,but the JAP alloy cage is still good........................I suggested to the owner to rebuild the whole motor with new WLA parts,including flywheels,rods, shafts ,bearings..........but cost is an issue ..... and its only a sidevalve................the conrods are also problematic,but the owner wants the JAP system retained..........in fact the outer forked rod is completely wrong since day one,and machining out the centre rod space has made part of it paper thin ,and its cracked.......every non racing JAP ive ever worked on had serious issues with poor quality and bad design.