Motorcycle Repair: kz 1000 kaw, mint shape, loose power

Question
hello i have a 1978 kz 1000 about 11000 miles  bike has ben parked for years, until , kids grow up. ok here is what im having problems with prior to parking it.   i going threw spark plugs like crazy can not even go 5 miles anymore, it starts to backfire and loose power,  i changed the spark plugs. it runs like a dream again for a few miles.  i notice that the plugs are wet and black like. i have taken it to repaire shops but no luck. people tell me its running to rich? do you have any clues  bike is in mint shape and with the price of gas now a days

Answer
Hi Mark,

Gasoline goes bad with time and changes chemically, or otherwise known as varnishes (gels). When varnishing occurs, jets and passage ways inside the carbs becomes obstructed. Requires disassembly and thorough cleaning. Carb kits may be needed to replace needle valves (float valves)and jets, etc... Cost about $20 a kit.

I suspect your carbs have varnished and need cleaned. Send me an email addy as requested. I'll return several repair info files on carb cleaning, adjusting, and spark plug reading. Send to: mshively1@woh.rr.com

Respectfully,
Mark Shively