the timing chain has slipped twice since i refreshed the upper end of my trx250x. there was no problem prior to doing this work. i retract the spring and hold it until the chain tensioner is bolted down and yet it still slips. perhaps the chain is worn but i find it too coincidental that it started after doing this work. does anyone no how much play there should be where the chain lay on top of the sproket? there is a little but not much. should it be very tight around the cam sprocket? if the tensioner is snapping out when i release it does that prove it is good or is there away to measure it? any help would be appreciated.
thanks dan

 

I think there is supposed to be 4cm of play in the chain located between the rear and front sprocket.

 

Make sure the front cam chain tensioner in particullar is properly in place. The end of it that goes down into the cases fits into a little slot just above the timing chain gear in the bottom end. If it's not in play you get good tension to begin with but after a while the chain starts to rattle around and jump teeth.