jeepwm69

Well this is @basfnb's, so I ordered one off of ebay. I have two of these in the yard, but didn't want to tear down an engine for a $30 part (got the whole input shaft with all the gears). And the afternarket cylinders, pistons, rings, etc have all dried up for these! Hopefully it's temporary, but it's all unavailable now! Nuts! Gaskets are no problem, but the others bits are unobtainium.

You can download the factory service manual free in the toolbar at the top of the forum. It's under "Service Manuals" button. This is a 2016, shows some details on what's under the front cover starting at about the 2 min mark. The 420's really haven't changed over the years.

So # 19 in this schematic? https://www.partzilla.com/catalog/honda/atv/2011/trx420fa-a-fourtrax-rancher-at/gearshift-fork My guess is either #18 is broken, or the spring fingers are not straddling it. Unfortunately no way to know without pulling the front cover.

You should be able to shift gears with the machine off. If you can’t you probably have problems with the shift linkage under the front engine cover. Lets look into that first. If you’re stuck in gear my guess is it is something similar to this

Welcome aboard. Is it an FA (auto/ ES with independent rear suspension) or a 420 FE (ES, or manual electric shift on handlebar)?

Found the shifting problem. Spinning the transmission on the bench was catching in either direction. Transmission gear on the input side of the transmission.

@rich250rracer you having any luck? I’m still in the same boat with this 2013 Foreman that has no spark.

My old air cooled, carb’d Foremans are easy to work on! This EFI “bigger 420” is giving me fits!

Everything else plugged in or ?

Did not. No change. (Well it went up like 2/100’s)

Well we all know my number of working brain cells is getting pretty low in number

I think maybe @_Wilson_™ or @Wheeler painted wheels silver and found the right color? I don't envy you having to break down some 589's. Those tires have some STIFF sidewall/beads. I found @shadetree's method of smearing grease on the beads to work well for most bead leaks. I rub the beads down good with steel wool, then smear a thick gob of grease all the way around.

Thanks for reporting back! Glad to see it worked out for you!

I’m out of daylight here. I’ll see what that does in the AM. Gotta get the mini-me to bed

yes sir. I did that. On the battery side I get full voltage. When I put a fuse in I get a voltage drop across the fuse. Tried multiple fuses. Something is drawing it down

I did check and clean the grounds per @retro as well

Thank you for your help! This one is a bugger. All from using an aftermarket coil.

11.53 with my voltmeter negative probe on the battery. 11.22 with the negative voltmeter lead on the green wire on the injector plug

@Wheeler

Fuse spot shows no corrosion etc. I’ve tried a different coil and a different coil with no change. From the test on the pick up coil I think that’s good. Not sure where else to look other than the ECU, but hate to buy a $210 part if that’s not it

11.15 at coil with wires jumped

10.94v at coil 12.28 at battery

Heading home from work now. Will report back shortly

Correct, sounds like it’s time for a new oil pump. The 05–14 updated oil pump is a much better design and bolts right in. You will see that part supersedes the original oil pump part number from 01–04