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my dad has a 1985 yamaha ss 440 and it is running funny. the symtoms are: idols nice and starts good, the tach will only go up to 4500 rpm even with the weight off the track. it there are any possible solutions you guys have that would be great. and when it gets hot it seems like it is running on one cylender. id you guys could help that would be good.
 

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look at the plugs to determine that one is fouled. put in new plugs.
 

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You might need to pull the carb and give it a good cleaning. I had an 82 ss 440 that did the same thing when I bought it. The jets were clogged. Also check the plugs and be sure to use fresh gas.
 
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