2007 honda rancher 420fm wont start, spark plug is dry - Honda ATV Forum
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post #1 of 6 (permalink) Old 07-06-2018, 09:31 PM Thread Starter
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2007 honda rancher 420fm wont start, spark plug is dry

hello, this is my first time posting in this forum, i have been searching for a few days and haven't ran across one with my symptoms. i apologize for the long description i'm just trying to be very thorough

i recently bought a 2007 honda rancher 420 4x4 from a family member of mine. knowing that is had been sitting for a while i knew i would have a little project on my hands but i am stumped. i got it and right away i had to replace the ignition switch because it had been cut and re spliced the start and light switch wires on the handle bars because he had cut them. then i cleaned the fuse panel with electric clean and replaced all fuses good or bad because of corrosion. then replaced fuel pump once i found that it had power going to it but not turning on.

hear is where is gets tricky. i sent the throttle body to a guy to get cleaned and checked(don't know him that well, was referred to him by a friend). i have good spark coming from spark plug, and i know i am getting fuel to the throttle body because i pulled off fuel line on it and turned it on. but i still cant get it to run. also none of the light on dash come on at all. i've checked all connections and everything seems good and clean. the fuel pump relay makes some very quiet clicks when i turn the key on. i also tried starting fluid and after about 5 to 10 seconds of turning over is will backfire and shoot a flame out of exhaust pipe. i also swapped pgm-fi off of my uncles bike which is a 2010 420es but i don't think it would have helped because the model numbers were different, i just wanted to try. mine wouldn't start his and his didn't help my problem. also swapped rectifier to a known good one with no change.

i am completely lost with the fuel injection bikes, and i am contemplating rigging up a carb and deleting everything or at least trying. so any information would be great full
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post #2 of 6 (permalink) Old 07-06-2018, 10:45 PM
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welcome to the forums. sounds like a clogged/dirty fuel injector to me ?. or fuel pump is not getting fuel to the injector ?. just because you hear clicking from the injector relay ?, does not mean it's getting fuel to, and through the injector. as for the dash lights ?, they should light up.

'89 trx350D foreman 4x4...'85 vf700c magna, '03 trx450fm foreman 4x4 , 2015 Yamaha waverunner fx cruiser ho, '08 vt750c2 shadow spirit
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post #3 of 6 (permalink) Old 07-06-2018, 10:48 PM
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unless your shooting to much starting fluid ?, it should run for a sec or two on it, if not ?, then you don't have enough compression, timing off ?, stuck rings ?, bent valve ?. why was it put away back then ?. was it ever sunk ??. if so ?, then you got worse troubles than trying to get it to run !. please don't '' hack '' the wire harness, and try to '' jerry rig '' it !!.

'89 trx350D foreman 4x4...'85 vf700c magna, '03 trx450fm foreman 4x4 , 2015 Yamaha waverunner fx cruiser ho, '08 vt750c2 shadow spirit
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post #4 of 6 (permalink) Old 07-07-2018, 09:53 AM Thread Starter
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thanks for the reply. i started this morning by digging around and found my compression tester. and it turns out that i have major problems on the top end. gauge wouldn't get over 30 psi. i went off my cousins word when i got the bike from him when he said he parked it because he ran bad gas in it and couldn't get it to start the next day after riding about 5 hours. i don't believe it would have been sunk but i may be wrong. so i will be tearing the top end off when i get back from offshore in 2 weeks. with that low compression i am thinking that the damage is going to be sever and will most likely be replacing the cylinder and piston as well. as far the wiring problem, sorry i should have mentioned that i am an I&E tech offshore(instrument, electrician) so i am pretty confident in my wiring. not saying that i didn't overlook anything, that a lot of wiring for a bike.

also, if i do end of having to replace everything, has anyone ever put the 500cc big bore kit in and did they like the extra power it provided?
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post #5 of 6 (permalink) Old 07-07-2018, 01:08 PM
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Quote:
Originally Posted by Michael Hubbard View Post
thanks for the reply. i started this morning by digging around and found my compression tester. and it turns out that i have major problems on the top end. gauge wouldn't get over 30 psi. i went off my cousins word when i got the bike from him when he said he parked it because he ran bad gas in it and couldn't get it to start the next day after riding about 5 hours. i don't believe it would have been sunk but i may be wrong. so i will be tearing the top end off when i get back from offshore in 2 weeks. with that low compression i am thinking that the damage is going to be sever and will most likely be replacing the cylinder and piston as well. as far the wiring problem, sorry i should have mentioned that i am an I&E tech offshore(instrument, electrician) so i am pretty confident in my wiring. not saying that i didn't overlook anything, that a lot of wiring for a bike.

also, if i do end of having to replace everything, has anyone ever put the 500cc big bore kit in and did they like the extra power it provided?
I can't speak for the big bore ?, but I can tell you, it wont be worth the hp gain. I keep my atvs stock. as for the 30 psi ?, yeah, i'd say its time to dig into it, and see what your problem is.

'89 trx350D foreman 4x4...'85 vf700c magna, '03 trx450fm foreman 4x4 , 2015 Yamaha waverunner fx cruiser ho, '08 vt750c2 shadow spirit
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post #6 of 6 (permalink) Old 07-07-2018, 03:03 PM
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You will see a noticeable gain in low end torque. Not much horsepower gain tho. It is about the same price. It think Fishfiles or Jeep did this swap and liked it.
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