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Discussion Starter · #1 ·
My friends CBR250RR wont start guys. have researched the internet & tried everything from, using WD-40 all over the battery and its connection, took the petrol tank off checked the fuel lines, looks fine petrol comes out when on and doesn't when its' off,checked all the wires I can see with the naked eye incase anything loose or/and not connected, tried jump starting and push starting.. no F'ing luck...!!
The thing is, it cranks but doesn't follow through. And the exhaust backfires here and there because of the unburnt fuel. I am thinking it's the spark plugs but I don't know.

All I know is that one day it started up fine, then the next... just cranks but does not follow through. Really, really irritates my friend. Any suggestions guys ???
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