Bigcbr Posted January 11, 2023 Share Posted January 11, 2023 Hi all. Have a problem with my 2016 cbr125 . Bike starts first time when cold , but once it warms up it will not start . Does anyone have the same problems and if so what did it take to fix it. Thanks Quote Link to comment Share on other sites More sharing options...
Mississippi Bullfrog Posted January 11, 2023 Share Posted January 11, 2023 What is it doing when it won't start? Does it turn over, or just not turn at all? Common hot restart problems can be.. . Poor battery charge. A hot engine has higher compression than a cold engine. Too rich a fuel mix will cause poor hot restarting. The engine will spin but not fire. The exhaust may smell of unburnt petrol. Blocked air filter. Damaged or poorly gapped spark plug. Failing coil. Crankshaft sensor failure...if fitted. The coil expands when hot and breaks circuit if it is damaged. A mate has just spent a fortune on his bike and it turned out to be a dud crankshaft sensor. Blocked fuel tank vent. When did it last get a proper service? 1 Quote Link to comment Share on other sites More sharing options...
Bigcbr Posted January 25, 2023 Author Share Posted January 25, 2023 It will start straight up , then if you turn it off within a minute or for ever long as you leave it running ,,until you turn it off then back on, It will not start ,,it will turn over then try to start for about a second then goes back to just turning over. Now it doesn't matter how long you leave the bike ticking over ,,once you turn bike off it will not start just keeps turning over until you flatten the battery Quote Link to comment Share on other sites More sharing options...
Mississippi Bullfrog Posted January 26, 2023 Share Posted January 26, 2023 12 hours ago, Bigcbr said: It will start straight up , then if you turn it off within a minute or for ever long as you leave it running ,,until you turn it off then back on, It will not start ,,it will turn over then try to start for about a second then goes back to just turning over. Now it doesn't matter how long you leave the bike ticking over ,,once you turn bike off it will not start just keeps turning over until you flatten the battery Have you checked the colour of the spark plug and the condition of the air filter? (As before - when was it last properly serviced?) Have you checked the battery voltage when cranking for the hot restart? Quote Link to comment Share on other sites More sharing options...
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