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So I rebuilt this engine completely with all factory parts. Transmission was damaged, so customer wanted to replace crank while I had it apart. After putting everything back together, everything worked great. Customer picked up bike and ran it for about two months (he uses it daily for work in crawfish ponds). Brought it back to me because it was overheating and would rev up to about half throttle and the cut out over and over while holding the throttle at anything above half throttle. Radiator was plugged. Everything with ignition tests good. I never loose fire while this is happening. ECM is brand new, fuel pump is new, injector is new, swapped TP Sensor with known good one. Fuel pressure is at 51psi at idle and its hard to tell because of vibration, but seems to drop to about 42psi while its cutting in and out at high rev. Any ideas on what could cause this?

I've got a 2014 Honda Trx420 that I'm having some issues with all of a sudden. I don't have very much experience with fuel injection so hoping someone can point me in the right direction. I bought this unit new and I've never had any issues with it ever until now. When I first start it, it seams to take a few extra cranks to fire up than usual, and then when it does fire it will only run for a second or 2 and then die out right away. Without cycling the key off and on again, I can crank it again and the same thing happens, running a little rough and I want to say I think I can hear the odd puff in the air box and then dies out again. A few more of these and it will start to slowly run a little longer each time, until finally the engine will idle on it's own. After its been idling for a little while and the engine seams to be at operating temps, then it seams to run great, I have no issues with idling or lack of power after that, and I can shut it off and it will start back up right away, unless I let it sit again for a few hours and then it's back to the beginning. New spark plug, Clean fuel tank, new gas and never sits long enough for the gas to go bad anyway. Battery shows 12 volts and battery tester shows good when a load is put on. I quickly checked the IACV and looked a little dirty so I cleaned it up and cycled the key with it removed and it spun the way it should. No change. I can hear the fuel pump running as normal when I first turn the key on. Computer isn't flashing any codes or engine light either. Put an an inline spark tester on to make sure nothing was cutting off the spark and it shows good consistent spark. I thought at first that it might be starving for fuel, but seams odd that it would get better once it was running for a while. I thought about changing the fuel filter right away but this model has the filter in the fuel pump and it would be a week at least before I can get a rebuild kit in my hands. Again I lack experience with these new models so I appreciate any and all advice. I use this machine nearly everyday on my farm and with calving coming up soon I need it to be reliable again.

This bike has a straight axle that is moving horizontally in the housing in both directions about 2 inches. Has anyone had the same issue if so what did it take to repair it? Thanks.. Darryl

View File 2007-2010 Honda TRX 420 Rancher Service Manual 2007-2010 TRX 420 Honda Rancher Service Manual Submitter flyinbrian365 Submitted 08/28/2018 Category Honda ATV

View File 2007-2014 Honda Rancher TRX420 Service Manual 2007-2014 Honda Rancher TRX420 Service Manual Submitter davefrombc Submitted 10/16/2017 Category Honda ATV