I need help tracking down the problem on my dads 450 es, no spark at the plug. I do not have a manual or wiring diagram. I did swap the ignition control module and no change. I dont know the resistance specs on the coil but I dont seem to be getting any voltage to the coil itself

 

The ignition power can be traced with a test light. While cranking over the engine, check the test light should flash as a signal is sent to the coil. Green wire at the coil is ground so go from there. I don't have a manual in front of me for wire colors so I will have to shoot from the hip here. Locate the ignition pulse wires coming out of the rear crankcase cover. They are not the 3 yellow wires as those are the stator wires. I believe blue with yellow wire is what you are looking for. Probe the wire at the connector and while cranking over the engine, the test light should flash. If not, the pulser may be bad.
Before condemming the pulser, make sure the voltage regulator is good. No power coming out of there = no spark

Can't guarantee a follow up on my posts. I am behind 168 units at my shop so I have been extremely busy

Hondamechanic should be able to help you out with diagrams etc.. that you need to trace the issue any farther


----- Gimpster -----

 

thank you for the info, i did notice today that the reverse light is on as well as the neutral light and the shift buttons are not working so I think i got off on the wrong foot... Kenneth

 

I emailed you the switches & the wiring sections .. I would first check the gear position switch coupler for moisture , if it is good check the switch using the info.. I believe your problem is that reverse light being on, the bike won't start if it isn't (or doesn't know) it's in neutral..

Here is the basic coil test , the ignition tests for the 1998-04 TRX450 that I have require a " peak voltage adapter "

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thanks for the diagrams they are great I have not looked them over yet but I will shortly, mornings are rough for me I have osteoarthritis in my spine. I sent you a e-mail before i checked the atv forums. Thanks again, Kenneth

 

I also sent you the ESP section the shift button test is there ..

 

thank you I will read it over and work on it Tuesday, thanks again you have been most helpful, Kenneth

 

well,now I am really stumped..LOL checked the gear position switch and it tested fine. then I unplugged the ecm and ohmed the grey wire(reverse) to ground, no short.With the ecm 16 pin unplugged the reverse light goes off plug it back in reverse light on. unplugged the gear position switch both neutral and reverse light on, if I jump the neutral pin to ground(at the gear position switch) the green led gets brighter..but the reverse light is still on..While I had the ecm unplugged and the key on i did a voltage check on all the pins the most I got was 9.6vdc

 

well I got the reverse light to go off,the lcd display in working as it should and the shifter buttons are working again but I still have no spark. The coil and spark plug are good( put them in my 250 and they work fine.any suggestions ?

 

So, did you find the reverse switch we spoke about on the phone? Sorry, I don't know what to say @ the NO SPARK !!! Just a thought....what did you bypass or do to make the reverse light go off?