Main Motorcycle: 1971 t120r
Join Date: Mar 2005
Location: exmouth devon uk
Other Motorcycle: triumph rocket 111
Extra Motorcycle: BSA Spitfire
|Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.|
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The concern that has been voiced by others, although I don't recall any instances where this actually occured, is that the cleansing properties of syn have the potential to loosen up crud in your engine and circulate it thru the bearings, since there are no filters on these engines. In addition, their is thought to be a risk of some large piece of hardened crud coming loose and blocking a key oil port, such as a piece in the sludge trap coming loose.
My personal opinion, for whatever that is worth, is that if you run the bike regularly, you will probably slowly clean your engine a little at a time and with each oil change more old crud will be removed. But if you let the bike sit for long periods, it could have more potential to work at larger deposits without circulating them and when you start the engine after that period, could have a slug of crud run thru with the potential to plug ports and passages.
It's all conjecture as far as I can tell. I don't believe anyone has posted an example of syn oil destroying bearings with crud or old crud coming loose and plugging a port and killing an engine.
And maybe, and I do mean maybe, the apparent lack of cases where syn oil has caused engine destruction or severe damage might very well be telling us that all the concerns voiced, mine included, are just a bunch of hooey.
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