helmut..i think we ran across this '91 trx350 the other day..and they never sold any of these in the states..not that i know of..lol..anyway..if your timming chain is to far stretched..messing with the chain adjuster wont solve your problem..not if your hearing a ticking from it anyway...if your chain is to far gone..so to speak..you can fix it the right way...buy a new one..orrrrr..you can give it a temp fix...the ******* way..lol..pull the tensioner out..tap a 10 mm socket onto the end of the plunger..or..you can take a piece of flat tin..or metal..cut it wide enough to go in the hole...bend it back around the plunger..crimp it real good..then..use the screwdriver to pull the plunger back..install it in the cylinder..start your bolts..try to get them as tight as posb..then take the screw driver out..finish tightening the bolts..crank it up..see how it does.