ham2 Posted October 6, 2007 Report Share Posted October 6, 2007 Does anyone out there know of the mod' (light machining/grinding of the crank-case--I think?) to carry out when you change the main bearings on a Sherco 290. Like someone said on here recently,it's the sort of job you only want to do once. I think it's a simple shallow groove or two above the mains to guide a condensed oil trail down onto the journal when the bike has cooled. I know Paxua wasn't a fan of the procedure. I was told about it years ago by a source( and he never had a 'modded' one returned to him) but typically I can't recall the details now that I need to. Thanks Quote Link to comment Share on other sites More sharing options...
big john Posted October 6, 2007 Report Share Posted October 6, 2007 Contact Al the Spanner at White Bros, Darlington, I know they did an experiment such as that you describe! Big John Quote Link to comment Share on other sites More sharing options...
ham2 Posted October 6, 2007 Author Report Share Posted October 6, 2007 Correct..that was my source Quote Link to comment Share on other sites More sharing options...
baldilocks Posted October 7, 2007 Report Share Posted October 7, 2007 The problem is the bearing Ham not the crankcase. New sherco's come with sealed bearings now so the oil gallery mod is now redundant really spend and extra Quote Link to comment Share on other sites More sharing options...
copemech Posted October 8, 2007 Report Share Posted October 8, 2007 (edited) I know Paxua wasn't a fan of the procedure. I seriously doubt that mod is near as important as keeping the "crap and dirt" out of the motor in the first place! Edited October 8, 2007 by Slapshot 3 Quote box fixed Quote Link to comment Share on other sites More sharing options...
ham2 Posted October 8, 2007 Author Report Share Posted October 8, 2007 job will be a lot better than the montesa you built !! OOOH.. You wouldn't let it lie Quote Link to comment Share on other sites More sharing options...
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