Rancher 420 Engine Assembly
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- Опубліковано 21 жов 2024
- 2007-2013 Honda Rancher 420 engine rebuild. This is a complete engine assembly video with step by step instructions. This can also be used to show how to do a top end rebuild as well as a valve adjustment. This engine is very similar to the 500 foreman engine as well.
I also have a few other videos for this Rancher 420 so check them out.
Engine removal video: • Rancher 420 Motor removal
Engine disassembly video: • Rancher 420 engine tea...
Engine valve adjustment video: • Rancher 420 Valve Adju...
Fuel Pump rebuild: • Rancher 420 fuel pump ...
Careful at 3:40 when you took that little metal bushing off there's an oil hole that lines up with the transmission shaft. Some of the metal bushing aren't splined but that one is and it looks like you put it a spline off (just warning ppl watching)
Also, THANK YOU FOR THE VIDEO!!!! makes my life so much easier and less stressful having a play by play.
Great video making it look easy. Would like to see on how to replace the clutches/ redo them.
I have one coming next week and it will probably get the clutches replaced.
Very detailed and well explained, great video.
Excellent video
Might just give me enough confidence to tear mine down which has a gear issue, no dive in 5th gear!!
You can do with very few specialized tools.
Did you put your crankshaft in v blocks to true it up prior to installing the crankshaft?
Awesome video
Im getting ready to tackle this job, im getting a lot of aluminum glitter in my oil
I have a 2007 Honda Rancher 420, well taken care of, only 900 miles and 154 hours on it. Road it one week ago and parked it. Ride it regularly to keep it running. Went to start it, and one loud click. Have since replaced the battery, starter solenoid, and starter, same click. Removed the 3-bolt cover on the back of the motor to gain access to the 17mm crank bolt, and removed the spark plug to see if I could turn the crank (maybe feel or here something). Counter clockwise it's fairly easy to turn for 360 degrees. However, clockwise is really tight at TDC. Any ideas as to what I might be running up against. Never been under water, oil is ok, coolant is full. Looked in the cylinder with a bore scope, nothing obvious. Since it's over 10 years old the Houston Honda dealers don't want to work on it.
Turning it clockwise, it should be tight at tdc if the plug is in but should not be tight with the plug out. Have you tried to crank it over with the plug out?
@@FourwheelerDoctor Yes, seems to get stuck at TDC. Starter gets a little warm too.
@@FourwheelerDoctor Just tried it again with 17mm on the crank with the plug out, and it gets really tight. Crazy, because it ran so well last week.
@@FourwheelerDoctor Looks like I have a bad crank. Thanks for getting back to me.
I have a 2010 rancher 420 2wd and it has me stumped. The timing is dead on and the chain is tight. No one has ever been in the motor, has good compression and leak down test is good, getting fuel(intake valve has gas and tried starting fluid), won’t even pop or anything. Has spark but it might be weak because it should at least pop for a second I’d imagine. Bike was running and just cut off. Coil has 19k ohms on second winding, primary is 2.5 ohms, pick up coil is 5 volts when cranking(book says anything over .7 so I wonder if that’s high), stator is .3 ohms between the three yellow wires and has no reading when grounding it to motor so there is not shorts. Have tried multiple new plugs. Gets 12v to the green wire on the coil with key on and 120v when cranking. I’m so confused on this bike and it is driving me crazy. Only thing is the cdi but it has spark and voltage at the coil is correct so I’m not sure. Any help would be appreciated.
Great informative video
Thanks for watching
Got a question for a 2018 Honda foreman 500FM. On the camshaft there’s a loose piece and when I turn the crank that loose piece makes the cam follower click. Any idea what that piece is for? It’s on the sprocket side of the cam
That is what they call a decompression cam on the cam. It opens the exhaust valve at low RPM to help the starter to crank the motor over easier.
I recently purchased a 08 420 es, but the engine was swapped out for a foot shift model. I was wondering if I could converter it back to es with the case I have or will I need to buy a doner engine and swap the front and rear cases?
If I’m not mistaken I believe the ES use the same setup transmission wise as the foot shift. I believe you could get away with just swapping front and rear covers and not the entire crankcase
Thank you for your reply. @NRKDFILMS
Gives me confidence to tear my rancher down for gear issues, when it gets to 5th gear there is no drive, picks up again when back in fourth!!!???
Hello ,great video , I noticed just before you put the tranny shafts in that the largest gear came off in your hand and when it was put back on the inner bushing's oil hole was not lined up with the shaft oil hole , seen this on another video and it was stressed as very important which makes sense . I am doing one of these engines and the shaft in question has several of theses splined bushings with the oil holes. could not find a reference to this anywhere other than the the other video that I mentioned ?????? What are your thoughts
I know what you're talking about and if you can line the holes up line them up. But I'm not real sure it makes that much difference because I don't think this shaft is pressurized with oil so that oil would be coming out of that hole. Also at pretty much any speed I figure oil is sloshing around in here off of these gears everywhere so everything get coated in oil.
@@FourwheelerDoctor The two trannny shafts have several of the bushings but are a smooth bore with a internal groove that allows the oil to circle the shaft to find the weep hole . the bush that I mentioned is splined internally so the shaft hole and the bush hole should be lined up to lube the gear that rides on the bushing . I checked the Honda Manual and both trans shafts are pressure fed
@@keithbennett1359 you are correct. I just looked at the oiling diagram in the manual as well. I wasn't paying close enough attention on the reassembly so it does make a difference which way the collar goes. That's one of the reasons I really try hard not to let any gears fall off of these things because it's a puzzle putting them back together. In this case I didn't get it right.
I pulled a newer model 420 transmission apart last night and that splined bushing you're talking about looks like it has a groove around the inside of it that would allow oil to travel around it and out. It also had two holes in the bushing across from one another but only one in the shaft. Which makes me think oil could travel around the inside of the bushing to the two holes to lube the gear no matter the bushing placement.
@@FourwheelerDoctor I can't really see how oil would travel around a course spline without taking the path of least resistance which would be to follow the lowest splines in the shaft rather than passing through the small hole to end up between the bushing and the gear that rotates on it ??? I went to the manual again and the sketches of the two trans shafts clearly show grooves in the smooth bore bushings and none in the splined ones. This was my first Honda 420 engine , hope we both can learn something here , I will have to wait for the next one to be sure . Thanks for the great debate . PS : I run "Keith's Mechanical" an ATV service and repair shop in NS , Canada
Is it pretty much the same for rebuilding the engine on a 2019 Honda rancher and a 2008?
Yes all of the 420.engines are pretty much the same
Is there any chance at all of asking you a quick question by email?
Thanks
Sure fourwheelerdoctor@gmail.com
What changed from 2013 to 2014? Some sites say they are the same?
As far as I know the only major thing that changed was the body style. The engine is pretty much the same. They did change the frame a little and I think 2014 was the first year they offered the dct transmission but the manual and electric shift engines remained the same.
@@FourwheelerDoctor Did you prime the engine by turning it over without the spark plug for a min or two?
@@Darkipod no I didn't. I normally oil the cylinder before installing but they normally crank pretty quickly after you turn them over.
hey man im in the middle of rebuilding this same motor and have a question, any chance I can email you or message through here? thanks for all your help and taking the time in these videos!
Sure send me a message at fourwheelerdoctor@gmail.com
@@FourwheelerDoctor thanks! Email sent on Saturday, just wanted to check in to make sure it didn't go in your spam folder
@@KevNH I think it may be the washer at 11:28
@@FourwheelerDoctor that one is accounted for already! I'm starting to wonder if it goes to something else the previous owner had apart or a washer that has to do with mating the differentials to the motor? hmmm
@@KevNH is it close to the same size of that washer?