i,ve had 2 or 3 issues in the last year with my 1098 but managed to fix them. now i have a new problem. the bike is running fine but when i return home it cuts out and will not start when the engine is hot. twice in the last 7 days the bike has done this with the dash reading at about 70. when i press the starter button it cuts out straight away not allowing the starter motor to kick in. i have done about 70 miles with a new battery and mosfet reg/rec. the battery is not a lithium and after this problem last week i moved the reg/rec to the right side of the bike, away from the exhaust but the same thing happened again. both times the bike has started once the temperature has dropped to 40. has anyone encountered this problem ?
Here are some checks. From free to expensive. Free / Very Low Cost Checks Poor battery or ground cable connections (loose/corroded terminals) Weak or ageing battery (test voltage under load) ECU mapping / fueling issue (if aftermarket exhaust or ECU installed) Low Cost Fixes Faulty starter relay Engine temperature sensor giving incorrect readings Dirty or partially blocked fuel injectors Fuel vaporisation / heat soak in fuel system Medium Cost Repairs Crankshaft position sensor failing when hot Low fuel pressure (fuel pump or clogged fuel filter) Worn or weak starter motor Higher Cost Repairs Valve clearances too tight when hot (desmo service) Worn starter sprag clutch (requires engine side disassembly)
Warm engine = more compression plus thinner oil = more strain on sprag clutch Try the free stuff in the list first.
