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Discussion Starter · #1 ·
ok so i have a 07 420 rancher EFI i had 30" silverbacks on it eventually my transmission gave out but over all was happy with how it rode. so now i got it apart fixing the trans and i want to turn 33" tractor tires... which even though larger in size weigh less. so far i am doing a 53% gear reduction, as well as planning to have a 500 cylinder/head put back on it instead of the 420. i have a programmer/exhaust to richen the AFR was wondering if there are any other popular mods? cams? idk as well as will any 07-13 cylinder work? that is how im understanding it.
 

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The GR alone will make a BIG difference, personally I'd do what you've mentioned above and try it out. I think you'll be happy with it.
I plan on running 31" tractor tyres with my 57% GR, I'm going to cut the carcass (between the lugs) to allow the tyres to flex better with less weight on them and to reduce weight further.
 

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Discussion Starter · #3 ·
im sure ill be happy im not too picky as it is, my goal is more to get it all done while its apart. im just making sure im not over looking anything basic im going to have the head checked out see if its worth porting/polishing at all... s
 

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Head work I'm not sure on if I'm honest, I was always lead to beleive that porting and polishing is pretty pointless unless your fitting bigger valves and a higher profile cam etc.
@wheeler did a lot of engine work to his 300 and from what I gather it's quite a beast now, he may be able to give you some good pointers
 

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If you want to put a 500 cylinder on it you have to use a 2012-up Foreman 500 top end. Rubicon will not work, nor will a pre-2012 Foreman cylinder.
 

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Discussion Starter · #6 ·
exactly what im looking for hopefully someone can chime in with more info on it because idk first ATV ive ever owned just have a habit of doing it right if i got to do it hahaha
 

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Discussion Starter · #7 ·
If you want to put a 500 cylinder on it you have to use a 2012-up Foreman 500 top end. Rubicon will not work, nor will a pre-2012 Foreman cylinder.
got any more info on this? whats the difference between them? and is that any 2012-2017 foreman cylinder?
 

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Discussion Starter · #8 ·
another idea, a 420 is a true 420 the 500 foreman is a 475 to my understanding can a 420 cylinder be bored to match a 500 piston/ring set?
 

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If you want to put a 500 cylinder on it you have to use a 2012-up Foreman 500 top end. Rubicon will not work, nor will a pre-2012 Foreman cylinder.
got any more info on this? whats the difference between them? and is that any 2012-2017 foreman cylinder?
12100-HR0-F00 CYLINDER $254.90

The 05-11 Foreman was air cooled. Totally different machine.

The 01-14 Rubicons were liquid cooled, but totally different engine.

The 2012-UP Foremans are pretty much beefed up 420 Rancher motors. Same crank, same crankcase, different cylinders, different clutches, different stators.

Get the 500 cylinder, piston, rings, and gaskets and bolt it on. Use OEM parts. Don't know about boring a 420 cylinder out that much oversize. My gut says no, but not positive.
 

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Discussion Starter · #10 ·
If you want to put a 500 cylinder on it you have to use a 2012-up Foreman 500 top end. Rubicon will not work, nor will a pre-2012 Foreman cylinder.
got any more info on this? whats the difference between them? and is that any 2012-2017 foreman cylinder?
12100-HR0-F00 CYLINDER $254.90

The 05-11 Foreman was air cooled. Totally different machine.

The 01-14 Rubicons were liquid cooled, but totally different engine.

The 2012-UP Foremans are pretty much beefed up 420 Rancher motors. Same crank, same crankcase, different cylinders, different clutches, different stators.

Get the 500 cylinder, piston, rings, and gaskets and bolt it on. Use OEM parts. Don't know about boring a 420 cylinder out that much oversize. My gut says no, but not positive.

thanks better explained
NEW 07-14 HONDA RANCHER 420 BIG BORE KIT 500CC CYLINDER GASKETS PISTON
if i get something like that thinks its a true 500CC bore or a 475 like the factory foreman?
 

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Discussion Starter · #12 · (Edited)
well i got it all back together ended up keeping the 420 head on the 500 cylinder the guy building my engine says he thinks itll have more bottom end that way... anyways what brand programmer is everyone running? theyre ranging from 100-300$?
 
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