What is the exhaust stud size and thread pattern?
SOURCE: I have a 2004 Yamaha TTr 125 with a bent exhaust
Usually nothing.
The valves usually bend easily , and the connecting rod bearing usually can take it.
With bad luck, you could have cracked the piston, bent the rod, squashed the bearing, damaged the crank, and worn the valve guide.
You can tell if the guide is warn by inserting a new valve and seeing it is rocks side to side too much.
Of course the real questions is how you threw the timing chain and allowed the valve to get bent?
SOURCE: 2003 Yamaha TT-R 125 L valve clearance
valve lash on the intake .003 to .005 inch, .08 to .12 mm,exhaust .004"to.0055 inch,.10 to .14 mm (cold engine).
SOURCE: chain size for dirt bike yamaha ttr 125
If it is a 00 - 06 Yamaha TTR125/TTR125E it is 116 link.
If it is a 00 - 06 Yamaha TTR125L/TTR125LE it is 122 link.
I’m happy to help further over the phone at https://www.6ya.com/expert/al_e83b1941f9c0f302
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