any 420 ranchers here with 500 big bore kit?? - Honda ATV Forum
Honda Rancher Discuss all models of the Honda Rancher 350/400/420

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post #1 of 30 (permalink) Old 03-19-2015, 04:58 PM Thread Starter
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any 420 ranchers here with 500 big bore kit??

Im strongly contemplating doing this mod,

can you give me more info? worth it?

receommend exhaust upgrade with it?
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post #2 of 30 (permalink) Old 03-19-2015, 05:46 PM
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It's not really a big bore kit, it's basically just turning your 420 into a 500 Foreman, with slightly different gearing. You don't need to do any other mods, just a EFI tuner.
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post #3 of 30 (permalink) Old 03-19-2015, 05:52 PM
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Quote:
Originally Posted by mac102004 View Post
It's not really a big bore kit, it's basically just turning your 420 into a 500 Foreman, with slightly different gearing. You don't need to do any other mods, just a EFI tuner.
thats EXACTLY what i want lol should have this option at the dealer so i don't have to rebuild my engine
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post #4 of 30 (permalink) Old 03-19-2015, 08:05 PM Thread Starter
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Id like to hear from folks who have done this mod befor i buy one. What do u mean gearing?
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post #5 of 30 (permalink) Old 03-19-2015, 08:45 PM
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Toodeep over on Hondaforeman.com did it. Ask over there. He's the moderator.

I'm going to do it on the wife's 420. Just need cylinder, gaskets, piston, and a programmer
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post #6 of 30 (permalink) Old 03-19-2015, 09:27 PM
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Originally Posted by mac102004 View Post
It's not really a big bore kit, it's basically just turning your 420 into a 500 Foreman, with slightly different gearing. You don't need to do any other mods, just a EFI tuner.
I'm confused here. Just how does changing gearing equate to an increase in engine displacement?
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post #7 of 30 (permalink) Old 03-19-2015, 09:48 PM
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You're not changing gearing. What mac is saying is, you are basically making the motor a 500 cc motor by increasing the bore while maintaining the gearing of the 420.

2013 Rancher 420 AT.
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post #8 of 30 (permalink) Old 03-19-2015, 10:01 PM
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exactly, a rancher is geared higher in STOCK form than a Foreman
so your just making a 500 cc'd rancher, you will actually change the motor, NOT gearing with this mod
I could be wrong, but is the cost benefits really worth it?
seems to me your going to invest a bunch of $$ in this mod, maybe better off selling and just buying a foreman, as the foreman will handle larger tires better, as I am guessing your looking for more power to turn bigger tires!
due to the higher gearing you have, even if you get the same HP as a foreman, your higher gearing will NOT turn tires the same as a foreman!, so?? if your goal is turning larger tires, its NOT going to turn them as well as the foreman, , even after you do all the mods/buy all the parts, do all the work?
maybe sell and just buy a foreman is a better option??
just food for thought, your money your atv, do as you please, just offering info!
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post #9 of 30 (permalink) Old 03-19-2015, 10:16 PM Thread Starter
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Ok, what about exhaust, jetting,?

before finding out about the bigbore kit, i was going to do a hmf exhaust and efi optimizer.

im only turning 25"s, maybe do 26's down the road, but i just want more power but same size bike, i dont want a bigger bike, im 5 '6 137 lbs

Basically, if i do a big borekit, what else should i do?
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post #10 of 30 (permalink) Old 03-19-2015, 10:27 PM
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if your atv is EFI< you have no jets to worry about, its computer controled for air and fuel mixing
and exhaust will add a LITTLE more power, and BY little I mean just that, maybe 1 hp actually to the rear wheels, when you do an exhaust a better breathing aior filter is a GOOD combo, want more air in to get more air out, BUT even a good filter and exhaust on PAPER might make 2-4 hp, and that doesn't mean 2-4 HP at the tires, and even if it was 2-4 hp isn't much really if you think about it, and it again for the $$< is your call on if its worth spending to get that little
the exhaust will make the atv sound different, better to some, LOUD to others!, again your call!
the programmer will be needed to get the efi system up to the big bore mod, or just reprogram the atv;s brain/computer, to run right
never done this to an atv, but have used programmers on cars and trucks, they work, but as for the car truck one's I have used, they ain't cheap either,. 300-400 for the one's I have had!, NO idea what they costs for an ATV?

NOW if your doing the big bore plan, and your NOT doing the work yourself, ist going to get pricy add the exhaust and them 2-4 hp(or say 10-12 with the big bore) is going to be a over a grand I am guessing
SO< is it really worth it to you??
all the more so if your only looking to run 25-36 inch tires??
Most folks get by in stock form on that size tires
sure we all would love more HP, LOL
But HP always comes at a price, and good reliable HP gains tend to never come cheap
why they say, better many times to just buy bigger at the start
I hear you on wnating a smaller sized atv, I like my smaller sized one better too for most things

just info to think about, not trying to talk you out of anything, just giving you idea's of what all is gained and costs!
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