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The clutch pin modification involves grinding 3 flats down the length of the push pin (in the centre of the clutch) to allow more oil into the clutch but I believe it can take pressure off the feed to the top end of the engine.
The modification in well documented on here if you do a search and it might be worth stripping the clutch to see if a previous owner has done the modification.
 

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I'm sure their gear and fork oil is fine , the name means nothing.
My original post was only to recommend the use of a quality oil not a specific brand. Most oil reviews concur that the more expensive oils use a higher grade base and better additives, so basically you get what you pay for.
As to knocking a particular brand or type I will keep my opinions to myself and reiterate my original post.. run whatever oil you wish just don't run cheap.
 
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