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I agree with C.Fritz. If it'll fire off with starter fluid, It should be fuel/system related. You said the fuel pump has been replaced. Have you verified the fuel pump is getting power? With the ignition on, before trying to use the starter, can you hear the pump inside the fuel tank running or humming?
 

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Mine wouldn't start at all. I used starter fluid with the tank off and with it on. So I don't think the diode is your problem. Maybe a relay? Did you change the fuel pump and housing or just the pump?
Just the pump, I cut pink wire on ignition switch and getting 10vdc so I assume diode good, my fuel pump primes just get no spark unless I disconnect fuel pump under tank. Kill switch good, stand switch good. Was thinking on moving on to BAS? Is that a common failure? Bike has not been dropped or stunts. Just shut down on me while riding
 

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Discussion Starter · #23 ·
Maybe there is a wire grounding out making it not get spark. I am an amateur to working on motorcycles. So maybe someone with more experience knows something.
 

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I have a 2018 Honda CBR 300r,and it's been sitting there for 2 years. Now i decided to ride again, drained out the old gas and filled with new; changed the oil and battery. It still doesn't want to start. I am very frustrated now. I have noticed the engine light is flushing, i am counting as 53, don't know if i should include the 2 very long flush when i first turn on the bike. Can anyone verify if i count correctly, and what else should i check?

 

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Someone who has a workshop manual may be able to help with diagnosing the flashing CEL code. But yeah thats trying to tell us something's not right. Your fuel pump sounds healthy when you first flick the ignition on.
Its not easy to get to on this bike unfortunately but if you could flick the spark plug lead off then you can put a test spark plug in there and hold it against the engine block while you turn it over. This will tell you if you have spark or not.

Remember the three key components to combustion are Fuel, Spark, and adequate Compression. There's a few variables in there in that the spark needs to be strong and timed correctly and the fuel needs to be fresh and mixed with air at correct proportions and also timed correctly.
Good luck!
 

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Someone who has a workshop manual may be able to help with diagnosing the flashing CEL code. But yeah thats trying to tell us something's not right. Your fuel pump sounds healthy when you first flick the ignition on.
Its not easy to get to on this bike unfortunately but if you could flick the spark plug lead off then you can put a test spark plug in there and hold it against the engine block while you turn it over. This will tell you if you have spark or not.

Remember the three key components to combustion are Fuel, Spark, and adequate Compression. There's a few variables in there in that the spark needs to be strong and timed correctly and the fuel needs to be fresh and mixed with air at correct proportions and also timed correctly.
Good luck!
Thanks for such quick response, I will purchase a new spark plug and test it.
 

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Thanks for such quick response, I will purchase a new spark plug and test it.
Cool, just make sure your holding into the rubber spark plug cap on the end of the lead when you crank it over so you don't get a shock!
 

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If the bike was not stored properly with fuel stabilizer there is a good bet the injector is clogged up
 
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