Not trying to step on toes, but it takes fuel (gas), spark, and air for an engine to run. Spark ignites the fuel and air allows for the burning of fuel. Timing is when things happen, such as the opening and closing of intake and exhaust valves. That said, if the timing is off by too much for some reason (or even valve adjustments are way out of spec), the motor will crank (turn over) but not start, or if it does start it will run poorly. When you checked spark, I presume you checked all the plugs, not just one. Check all fuel lines,make sure the butterflies on the throttle bodies are opening and working freely without binding. As others have said, you can also check the injectors, and IIRC, a faulty FPR might cause the bike to not start. Another thing you can try is to spray starting fluid in the throttle bodies and if the bike starts and runs for a short period or time (until the fluid is all burned) then you have eliminated both air and spark again and can look at fuel alone. And please, do keep us updated. Good luck.

 

not to be a d, but u jus used them as the same thing "turn over" to mean the engine will crank" ive bn in a garage 4 15 years & when told to crank it or turn it over it means ur using the starter to spin the engine

 

Yes, that's because that is what I meant. The engine crankshaft will rotate (turn over) but the engine will not start and run.

 

I would lean towards checking the fuel pressure regulator as nrwhiteknight suggested. Pull the vacuum line off and see if there is any sign of gas. F4i's have issues with them failing, so its worth looking into.

Also, I would try to start the bike, then right away, pull all sparkplugs to see if they are wet. Don't give them a chance to dry off. If they are wet, replace them. Many sparkplugs once fouled, especially thin electrode ones like these bikes use, will fire outside of the combustion chamber, but not inside the combustion chamber when compression and gas are added to the mix. Once they foul, they should just be replaced.

Shooting some starting fluid down the throttle bodies is also a good idea to see if you get any reaction.

I would also make sure you connected all of the wires back up to the battery. Some bikes have more than one lead going to the battery besides the main cables. Its probably not the issue, but just throwing it out there just in case.

 

anymore updates bud?

 

Im just going to throw this out there but I know a lot of people do gravity fed... I don't have a fuel filter on my bike maybe bypass it to see if it starts to just see if that's the problem just a idea.