Advice from the Haynes manual for a bike I'm buying - trouble-shooting if the bike won't start: 1. Is there fuel in the tank? On models without a sub-fuel tank, raise the seat and open the main fuel tank filler cap (Figure 1). On models with a sub-fuel tank, open the sub-fuel tank filler cap (Figure 2) and rock the bike from side to side. Listen for fuel sloshing around. WARNING Do not use an open flame to check in the tank. 'nuff said!