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You might end up having a long list to eventually check, but the very first thing that I would check is compression. Gauges are cheap to buy, even cheaper to borrow. Remember to open the throttle to wide open when you're cranking it over to take a reading.
After that I think that I'd check the fuel system, filters, hoses, etc. Maybe pull the bowls off of the carbs for a look and a cleaning, reset the float level. If you have Mikuinis, your main jet holes won't be round anymore. Balance the carbs to each other. Does the throttle open the carbs to wide open? I've been fooled by that one before. Are the CV diaphrams in good shape? Have a look at the air intake to make sure that a mouse didn't move in upstream from the air filter. Maybe a coil is dying but I would think that you would notice a miss.
Did your fuel milage change in this period?
Here's to it being something simple and inexpensive.
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