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Old 07-16-2010, 05:27 PM   #1 (permalink)
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Default cams vs. big bore kit

which one will give you the most power gains?
both hot cams or say a 435 kit?
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Old 07-16-2010, 06:00 PM   #2 (permalink)
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a 435 kit with both hotcams.
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On the to do list:Extra lighting-Dual piston rear caliper-Dyna CDI-And what ever else i find out about in the future.
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Old 07-16-2010, 07:09 PM   #3 (permalink)
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if you had to do one or the other what would it be?
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Old 07-16-2010, 07:48 PM   #4 (permalink)
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well, if you look in my sig, i have pretty much all of the supporting mods to do a big bore kit later on when i need a top end re-build. i just want to get my moneys worth out of the motor before i go and put in a new piston and cylinder. im happy with the power i have now though. not that i dont want more power. you just wont get the full effect of a big bore without the supporting mods.
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Yellow 05 Z400: Engine: DRZe fly wheel-DRZe Gaskets-Kibblewhite springs-Wiseco Cam Chain-Stainless reusable oil filter
Hotcams-Hotcams shim kit-HMF full system-DPI Header Wrap-FCR 39 w/AP cover and other mods
Jets-R-Us pull choke-Pro Flo kit with K&N filter-Custom EHS style lid(made it myself)-20 fin inline coolant cooler-Aftermarket CDI(Procrap)-Amsoil only

Everything else:ITP Holeshot HDs all the way around on ITP T-9s 22F/20R-Burgard +2 A-Arms-Fly fat bars-Cycra handguards
Trail Tech fat bar clamps/light plate w/Z400 logo-UM pro peg nerfs-G-force axle-Easy pull clutch lever
Motosport front bumper-PRM 6pack rack grab bar-Pro Armor skids front to back-OMF shrouds
YFZ450 front calipers-YFZ450 brake reservoir-Red Stainless braided lines W/Billet Clamps
Stream Line wave rotors/front-Rear caliper block off plate-PEP steering stabilizer
Billet aluminum Team Yoshimura starter cover-Billet aluminum case saver-Dr.D reverse switch
Tusk billet gas cap

On the to do list:Extra lighting-Dual piston rear caliper-Dyna CDI-And what ever else i find out about in the future.
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Old 07-16-2010, 10:01 PM   #5 (permalink)
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i often why people are going with the 435 , why not the 440 or even a 450 bore ,we all know your going to want more and more power .
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Old 07-16-2010, 10:23 PM   #6 (permalink)
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im not partial to the 435. personally, id do the 440 or 450 but i was just saying in my opinion id get all the supporting mods like i did first and then get a big bore. thats just my logic.
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Yellow 05 Z400: Engine: DRZe fly wheel-DRZe Gaskets-Kibblewhite springs-Wiseco Cam Chain-Stainless reusable oil filter
Hotcams-Hotcams shim kit-HMF full system-DPI Header Wrap-FCR 39 w/AP cover and other mods
Jets-R-Us pull choke-Pro Flo kit with K&N filter-Custom EHS style lid(made it myself)-20 fin inline coolant cooler-Aftermarket CDI(Procrap)-Amsoil only

Everything else:ITP Holeshot HDs all the way around on ITP T-9s 22F/20R-Burgard +2 A-Arms-Fly fat bars-Cycra handguards
Trail Tech fat bar clamps/light plate w/Z400 logo-UM pro peg nerfs-G-force axle-Easy pull clutch lever
Motosport front bumper-PRM 6pack rack grab bar-Pro Armor skids front to back-OMF shrouds
YFZ450 front calipers-YFZ450 brake reservoir-Red Stainless braided lines W/Billet Clamps
Stream Line wave rotors/front-Rear caliper block off plate-PEP steering stabilizer
Billet aluminum Team Yoshimura starter cover-Billet aluminum case saver-Dr.D reverse switch
Tusk billet gas cap

On the to do list:Extra lighting-Dual piston rear caliper-Dyna CDI-And what ever else i find out about in the future.
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Old 07-17-2010, 12:38 AM   #7 (permalink)
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I would prepare the engine first to be able to support the big bore and get the most out of it.
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Old 07-17-2010, 10:09 AM   #8 (permalink)
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Quote:
Originally Posted by cataway View Post
i often why people are going with the 435 , why not the 440 or even a 450 bore ,we all know your going to want more and more power .
I'd say the main reason would have to be the affordability. Some very good deals on the 434 kits vs. the others.

As for the mods....per another ongoing thread, do your suspension first.
I did mine (and not even very well) after I did everythng else. We do alot of racing up the big dunes at Glamis and most have a pretty good whoop section at the bottom. I could go like hell once I hit the hill but my buddy would already have 3 bike lengths on me cuz of his suspension.
At the end of the day you won't be any faster through most of the stuff you ride unless you upgrade your suspension to handle it.

You don't say if you have any mods already (pipe, filter, cdi, etc). There are other things you will need/want to do before cams or bbk anyway.
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Old 07-18-2010, 01:53 PM   #9 (permalink)
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i have a yoshi slip on, intake, and a rev box on it right now, reason why i was asking is my engine started to develope a little tap so while i take it apart to inspect i was going to throw a set of hot cams into it and i was just curious which one was the best.
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Old 07-18-2010, 01:56 PM   #10 (permalink)
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spize909 i totally agree with on the suspension that is my main focus but luckily for me i have to get into the motor so i figured i should just go ahead and throw some cams in it. how do you feel on running stock LTR shocks with triple rate springs?
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Old 07-19-2010, 07:37 PM   #11 (permalink)
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I put a 434 kit in mine and I really cant tell the difference but i got a hell of a deal on it thinking it would help me more than it did. And i have velocity intake, hotcams, full hmf, big gun rev. But i do have a 39mm fcr on the way that i hope with help out
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Old 07-19-2010, 08:28 PM   #12 (permalink)
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I put a 434 kit in mine and I really cant tell the difference but i got a hell of a deal on it thinking it would help me more than it did. And i have velocity intake, hotcams, full hmf, big gun rev. But i do have a 39mm fcr on the way that i hope with help out
in your case the hot cams are most likely holding you back
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Old 07-27-2010, 11:05 PM   #13 (permalink)
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What cams should i be lookin into? The only place i have found big cams is cycleworksracing.net Any help would be great i have tried to look up some of the cams i see people have in their quads but can't find them.
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Old 07-28-2010, 06:55 AM   #14 (permalink)
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you dont have to go with a big radical cam to get big power and your going to find there are more options than you may have even contemplated .
my self i went with RHC #187 which is a web cam , the lift is not really high but it does have a big duration, power increase over hotcams was huge
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Old 08-19-2010, 10:19 PM   #15 (permalink)
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Personaly i agree with hamilton. Think if your just putting a big bore in a z400 or kfx. your going to need a carb air filter and supportes just for the BIG BORE. Im going to build till theres nothing else to do then put a big bore. if ur just throwing one in for quick power your going to be in all sorts of issues.
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