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 Engine Top-end Rebuild

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Kenny G

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PostSubject: Engine Top-end Rebuild   Tue Oct 01, 2013 7:00 pm

Looking to get some more torque out of the 450 engine. Looked at an engine builder site that claimed big results with putting a 10.5:1 piston, webcam,kibble valve springs, more air and open up exchuast on the 450 and it would out run a stock 660 engine? I'm not real savy on engine building, but would like to do some upgrading to my 450. Any good ideas from any of you builders. I'm not interested in buying a new bike with bigger displacement. scratch

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06/450;JBS HR Sheave/12gr;Blue Spring;K&N Air/04 Style;HF Fuel Pump;Axia Tip;Dyna CDI;27X14 Mudlite/ITP/SS;2" All Four Corners;3" Xtreme Lift;Seizmik Versa Shield;Custom 2 Seat Cage;Digital Dash;Yamaha 2" Fender Flares/3 Spoke Wheelin Wheel;CRB Diff Support;EMP Rear Step Bumper;Warn Winch;Ryde-On Blanket;BR Graphics;
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rhino727

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PostSubject: Re: Engine Top-end Rebuild   Tue Oct 01, 2013 9:00 pm

Kenny how much would it cost , maybe check out a 660 swap then you could mod it even more later  Twisted Evil  an remember there is no replacement for  wait for it.... displacement  lol! lol! lol!

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2007 Special Edition 660, Hotrods crank 4mm stroker , wiseco 2mm over 10/1 piston, new head ported +2 valves,  mudbuster cam, billet middle gear support, JBS sheave 14g with purple spring an friction washers , new wet clutch + 6g lead, Gibson header&muffler,4000lbs winch,26 in mud-lites  ,3in lift, snorkeled, dyna jet kit, K&N air filter with pro-flow adapter, floorboard guards, radiator guards, fender flares
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Kenny G

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PostSubject: Re: Engine Top-end Rebuild   Tue Oct 01, 2013 9:37 pm

I've thought about the idea of saddling up a 660. What I've seen you are eye balling $2.5K - $3K + for a used 660 motor, and there isn't chit around here for used Rhino parts. I like the 450's low-end but she could use more torque with all the good I've got her packing. Lighten the load and she'd do just fine to run up and down dirt roads but that's not my ridin style. Maybe I think I can get to much out of the 450 engine. I'm like a dog with a bone, don't want to giver up.

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06/450;JBS HR Sheave/12gr;Blue Spring;K&N Air/04 Style;HF Fuel Pump;Axia Tip;Dyna CDI;27X14 Mudlite/ITP/SS;2" All Four Corners;3" Xtreme Lift;Seizmik Versa Shield;Custom 2 Seat Cage;Digital Dash;Yamaha 2" Fender Flares/3 Spoke Wheelin Wheel;CRB Diff Support;EMP Rear Step Bumper;Warn Winch;Ryde-On Blanket;BR Graphics;
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rhino727

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PostSubject: Re: Engine Top-end Rebuild   Tue Oct 01, 2013 9:57 pm

how big of a cylinder /piston can you go to  get that 450 up to 500 maybe , what about the grizzly 550 top end would it fit/work on your 450

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2007 Special Edition 660, Hotrods crank 4mm stroker , wiseco 2mm over 10/1 piston, new head ported +2 valves,  mudbuster cam, billet middle gear support, JBS sheave 14g with purple spring an friction washers , new wet clutch + 6g lead, Gibson header&muffler,4000lbs winch,26 in mud-lites  ,3in lift, snorkeled, dyna jet kit, K&N air filter with pro-flow adapter, floorboard guards, radiator guards, fender flares
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Kenny G

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PostSubject: Re: Engine Top-end Rebuild   Tue Oct 01, 2013 10:17 pm

The biggest I've found at JE was (10.5:1) 86.5 = 440 cc, the stock is 84.5 = 421 cc. I think if the memory is correct.

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06/450;JBS HR Sheave/12gr;Blue Spring;K&N Air/04 Style;HF Fuel Pump;Axia Tip;Dyna CDI;27X14 Mudlite/ITP/SS;2" All Four Corners;3" Xtreme Lift;Seizmik Versa Shield;Custom 2 Seat Cage;Digital Dash;Yamaha 2" Fender Flares/3 Spoke Wheelin Wheel;CRB Diff Support;EMP Rear Step Bumper;Warn Winch;Ryde-On Blanket;BR Graphics;
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08Rhino450SE

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PostSubject: Re: Engine Top-end Rebuild   Tue Oct 01, 2013 10:23 pm

if you work with a builder ask to see dyno sheets first and then talk about how much money it will take to get there.

keep in mind that runnability (heat output, smooth idle, noise, power band) will be affected as well as reliability.

make sure you know exactly what you want before you start the build bounce

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Kenny G

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PostSubject: Re: Engine Top-end Rebuild   Tue Oct 01, 2013 10:56 pm

Denny you always have good input, but I'd not even know what a Dyno sheet looked like, power to the wheels? Don't have any real atv/utv builders here other than dealership shops and I wouldn't take anything there to get screwed with.

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06/450;JBS HR Sheave/12gr;Blue Spring;K&N Air/04 Style;HF Fuel Pump;Axia Tip;Dyna CDI;27X14 Mudlite/ITP/SS;2" All Four Corners;3" Xtreme Lift;Seizmik Versa Shield;Custom 2 Seat Cage;Digital Dash;Yamaha 2" Fender Flares/3 Spoke Wheelin Wheel;CRB Diff Support;EMP Rear Step Bumper;Warn Winch;Ryde-On Blanket;BR Graphics;
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UnderDawg

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PostSubject: Re: Engine Top-end Rebuild   Tue Oct 01, 2013 11:04 pm

Kenny G wrote:
The biggest I've found at JE was (10.5:1) 86.5 = 440 cc, the stock is 84.5 = 421 cc. I think if the memory is correct.
what about Wiseco?  its 11;1. stock is 10;1

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Kenny G

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PostSubject: Re: Engine Top-end Rebuild   Wed Oct 02, 2013 12:09 am

Thanks Joel

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