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Join Date: Jan 2011
Location: Smack in the middle of Illinois
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There is no need to take the RH cover off for a broken cam chain, but if the cam chain broke, it will most likely result in the engine needing the top end rebuilt (broken cam chains usually result in bent valves if the was running above idle when it happened and many times the valves or a valve will be bent even at idle).
First, determine if the chain broke - remove the cover over the pulse generator (top of cylinder, LH side, 125 or CDI embossed into it) and the recoil starter - use your hand to try rotating the recoil starter cage both clockwise and counter-clockwise - if the pulse generator rotor turns in sync with the crankshaft, then the timing chain is fine - on to finding out what really happened.
If the timing chain is broke, you will need a service manual to properly remove the sub transmission prior to removing the alternator cover - also, you will need some special tools to remove the alternator rotor.