I have bought front and rear sprockets with the chain, Genuine Japanese make. front 13 teeth, rear 46 teeth ( remember like it has to be 47) and 520 chain.

Just wanna know what would be the upper slack in the chain...should there be an upper slack? I know what happens with upper slack is that u start in neutral and right after u switch to the 1st gear...there is some powerful forward rotation of the front sprocket till slack straightens..if you get what I mean. This applies an unnecessary force on front sprocket teeth, front sprocket shaft, chain and the rear sprocket..in my other bike the front sprocket shaft was greatly worn so I had to get it the worn refilled with iron.

Am going to set up these to the same bike so dont wanna see that wearing happens again.

I think there should be no upper slack in the chain...what do u guys think?

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Hi kelum" you need slack, ..if its too tight, as soon as suspension loads up. stress is on the sprocket bearing, behind sprocket, [ on output shaft] rsulting in premature wear, the seal will also piss oil,

Hi kelum" you need slack, ..if its too tight, as soon as suspension loads up. stress is on the sprocket bearing, behind sprocket, [ on output shaft] rsulting in premature wear, the seal will also piss oil,

Yeah Buddy thanks for info. I know that issue. What I am asking is do u need an upper slack..I have mentioned the issue I had in my bike. O think upper slack was too much right aft I shifted gear front sprocket would rotate a bit straining the whole thing..so I had to refill the sprocket shaft's sprocket-fitting end...did you mean there should be a slack at both up n down?