Just rebuilt an engine - replaced most of the bearings (ie those that were in need of replacement! - including mains), cam chain, tensioner, rings etc etc. Bottom end of motor sounds mechanically rough when it is running. No obvious wear in big end.

I suspect wear in the primary drive gear/clutch drive/oilpump drive since this is the area the noise is coming from & it sounds more like gear noise than a bearing going.

Has anyone else experienced similar symptoms?

I heard from a local mechanic that XL125/185 etc can sound rough in this area.

No idea about the engine problems Gordon, but the tank/ seat unit you were looking for is currently advertised on ebay . the guys number is 07761971756. There is no price mentioned, but you are loaded, or so Kenny tells me. Good luck!

Gordon,

Try swapping your oil pump from your other tlr.