Exhaust pipes discolored
It may indicate that but that doesn't mean there's anything wrong with it. If the bike sat for a long time while running, the exhaust can get hot enough to discolor the pipes...but that doesn't mean there's anything wrong with the motor. Improper carburetor settings can make the bike run lean (not enough fuel) which, in turn, can cause a hotter than normal exhaust and discolor the pipes...again, this does not indicate there is anything wrong with the motor. Ask if the pipes are stock or after-market. After-market pipes are a minefield for motorcycle riders. When the manufacturer puts the stock pipes on, they are tuned to the motor to give peak performance which usually results in little to no bluing of the pipes. Aftermarkets can throw the tune off and discoloration is the result. Ask the seller if there have been any changes to the bike...such as after-market pipes, rejetting the carburetor, changing the intake, etc. Most likely the seller will say yes, there have been some changes made. Please note: THIS DOES NOT MEAN THE BIKE IS BAD OR THE ENGINE IS WRONG.
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