It kinda slipped by, but synthetic oil would crank a lot easier. I am curious though, what would be the lightest oil for these in cold weather? That with the new battery and I would be surprised if it didn't start right off.
Also, Do we periodically have to pour some oil in the left side case? I think this may not be required.But I still think it is something with the sprag clutch system (atleast in my MC) that is slipping the starter motor and not engaging the engine.
1. Does this still seem to be a sprag clutch getting weaker? - my dealer does think that is case. That is possible. Wear on the sprags from their slipping without fully engaging can damage the profile on the end of the individual sprags causing them to slip more.3. For UCE, even though there is no need to pour oil (same type as above) on the LH crankcase, would it help doing so? especially for cold start and what I am observing with the clutch plates having to be disengaged - again not sure this required...There is no need to do this. The right and left sidecover both communicate with the central oil sump thru several holes.When the oil level is correctly filled, the oil in both sidecovers are at the proper level.4. Could this be the auto-decompressor (?) needing adjustment, if any?The auto-decompressor is located on the exhaust cam and has nothing to do with the engagement of the sprag clutch. If it was not engaging, the starter motor would tend to 'bog down' as the piston rises on its first compression stroke but I don't think this would cause the clutch to slip more than it would with the auto-decompressor working right. As regard with oil, going with 15W-50 moto oil could help out. The following oil came up as options, any suggestions on these, or do I have to worry about this at all?Motul-5100-Ester-Synthetic-Enginehttp://www.motorcycle-superstore.com/14/71/988/21085/ITEM/Motul-5100-Ester-Synthetic-Engine-Oil.aspx?WT.ac=SLIsearchMaxima Maxum4 Extra Oilhttp://www.motorcycle-superstore.com/14/71/988/7376/ITEM/Maxima-Maxum4-Extra-Oil.aspx?WT.ac=SLIsearchI haven't used either of these oils but going to the thinner 15-50 weight oil could help quite a bit.The sprags are usually located within a spring loaded device and the increased thickness of the cold 20-50 weight oil could cause them to 'hang up' on the springs rather than allowing them to freely engage the crankshaft as they should.The thinner 15 weight oil will be more like the warmed up 20-50 so I would expect the clutch to act more like the 20-50 does when the engine is warmed.
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