where do i start ? i bought a yzfr 125 as a project . The bike would start but would not take the throttle. I put it to an auto electrician who checked all the wiring ,replaced the fuel injector and changed ecu still no change. I put it to a garage and they said the compression was low , i purchased a second hand engine for them to fit and was told the compression was low on that one also, i took the bike back as i was not convinced that the diagnosis was correct. I then bought a gen two engine with low miles from a running bike .i fitted the engine using the gen 1 throttle body on gen 2 manifold . low and behold the bike starts but will not take the throttle. again changed injector and ecu no change .
Any help would be appreciated