You should just put a saddle on your ass so I can keep riding it.
You know -- the new fuels do like to eat the old style rubber parts.... so the diaphragm in the fuel pump --- or any rubber lengths in the fuel system -- maybe a short length from the tank to a hard line or? Sometime they APPEAR fine from the outside but are shot on the insides...
ASSume all the spark plug wires have been looked at.... where they might be fine at low rpms and power ranges until you put the boots to it. A quick check I've done is to wait until dark -- pull into the garage with all the lights off - and fire it up and open the hood... and look carefully for any arcing on headers - or a cracked boot to head - or ??
Plugs in good order?? Again they might be able to light off light loads but can't light the richer A/F ratios when the throttle is banged....
Valve adjustment? ASSume you're running solids....
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