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Old 10-09-2011, 02:32 PM   #1 (permalink)
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rancher 420 top end kit! HELP!

Ive tackled numerous tasks in my day. im an automotive mechanic by day but have done motors in anything from boats to go karts, jet skis, but never a four wheeler. i have a 2008 honda rancher 420. its smoking after being warmed up. i feel comfortable rebulding the motor, NOT a problem. but over the years ive learned to ask for assistance from someone or group of people that have done things before.
SOO....
has anyone pulled a motor in a rancher 420? any tips? tricks? any will be much appreciated.

Also, where is the best place to order parts?
Thanks and im ready to ride so i need this help ASAP so i can
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12" ITP SS wheel
2500lb Warn Winch
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Old 10-09-2011, 02:49 PM   #2 (permalink)
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I order stock replacements from mrcycles.com. Performance parts from magicracing.com or rocky mountain.
I never worked on a rancher 420, but I've worked on alot of atv's. It's a good idea to have a service manual on hand, you can download one in the manuals section. make sure you check all the tolerances when rebuilding, ring gap, piston to wall clearance, valve lash, torque values, etc... just all the standard stuff, the manual has em all. Buy good parts and it'll last for a long time. I use a permatex valve lapping kit to reseat the valves whenever I'm in a motor.
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Old 10-09-2011, 02:58 PM   #3 (permalink)
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I agree, just go to the manuals/schematics section and download the service manual. Since you're a mechanic, you shouldn't have any problems at all. ATVs are easier to work on than automobiles, in my opinion.
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Old 10-09-2011, 07:57 PM   #4 (permalink)
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and you don't need to pull the motor out...just to do a top end job..motor stays in..that is..unless your splitting the motor ??..lol...which..i'd think you were crazy for doing that..just to do a top end over haul lol.
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Old 10-09-2011, 08:41 PM   #5 (permalink)
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Quote:
Originally Posted by shadetree View Post
and you don't need to pull the motor out...just to do a top end job..motor stays in..that is..unless your splitting the motor ??..lol...which..i'd think you were crazy for doing that..just to do a top end over haul lol.
Well i was planning on doing the rings along with the valve seals and all the goodies. so would i need to pull the motor for that? i kno it would be a hell of a lot easier. ill try it bc i want to do it as fast as possible so i can ride....
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2008 Honda Rancher ES
2" lift
27" ITP Mud Lites
12" ITP SS wheel
2500lb Warn Winch
HMF Slip on Exhaust
HMF Power Commander
-When in doubt, FLOOR IT!
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Old 10-09-2011, 08:43 PM   #6 (permalink)
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Quote:
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Quote:
Originally Posted by shadetree View Post
and you don't need to pull the motor out...just to do a top end job..motor stays in..that is..unless your splitting the motor ??..lol...which..i'd think you were crazy for doing that..just to do a top end over haul lol.
Well i was planning on doing the rings along with the valve seals and all the goodies. so would i need to pull the motor for that? i kno it would be a hell of a lot easier. ill try it bc i want to do it as fast as possible so i can ride....
No, you don't need to pull the engine to change the valve seals or the rings. You can remove the whole top end with the engine still in the frame.
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Most 4-wheeler problems are caused by a loose nut connecting the handlebars and the seat!!

You only need two tools in life -- WD-40 and duct tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape.
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Old 10-09-2011, 08:51 PM   #7 (permalink)
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Quote:
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Quote:
Originally Posted by shadetree View Post
and you don't need to pull the motor out...just to do a top end job..motor stays in..that is..unless your splitting the motor ??..lol...which..i'd think you were crazy for doing that..just to do a top end over haul lol.
Well i was planning on doing the rings along with the valve seals and all the goodies. so would i need to pull the motor for that? i kno it would be a hell of a lot easier. ill try it bc i want to do it as fast as possible so i can ride....
nope..all of that can be done with the motor in the frame..just like helmut said also.
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Old 10-10-2011, 11:07 AM   #8 (permalink)
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awesome! well guys i really appreciate the info! im starting to really enjoy this forum
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2008 Honda Rancher ES
2" lift
27" ITP Mud Lites
12" ITP SS wheel
2500lb Warn Winch
HMF Slip on Exhaust
HMF Power Commander
-When in doubt, FLOOR IT!
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Old 10-10-2011, 04:40 PM   #9 (permalink)
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awesome! well guys i really appreciate the info! im starting to really enjoy this forum
your welcome..we are very helpful here..alotttttttt of great members here !.
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