cams or pistons???

personally i would just pick one up at a time then when you have everything through it together that would be the only way you will see good gains just my opinion though

...plus, you can't have good cams without the pistons too.

Good cams wont work with stock pistons the pockets are not deep enough you need both

And pistons alone are not much of a gain without the cams

if you want one thing on your stock motor to beat him just get nitrous

Understood, how about other mods that are external? Would ported heads help or are the castings pretty good stock??? 6degree key??? Bigger carbs??? UPP intake??? Help me out here.

Your gonna have to BBK or spray to beat a YFZ there is no getting around this.

I raced a yfz a year or so back when I had wiseco pistons, HMF's and a stage 3 clutch and not much else and it was a very close long race in the sand. Cams would have easily put me way ahead.

^^^ ah haaaa. So unless I wanna spend some serious dough I need to stick with raptors and such. Heart breaking, isn't it.

you can compete if you tweak your machine to perfection.
pipes,jetting open airbox,clutchwork and good skills
That means dynotime and time on the strip recording times and making small changes.Practice and attention to detail.

To obliterate the competition.

Man up---save up a grand or so---and build it!
They will all eat dust.

The v is slower stock from the box.
but
it can be built beyond all other machines--so far

JRENIGAR said:

^^^ ah haaaa. So unless I wanna spend some serious dough I need to stick with raptors and such. Heart breaking, isn't it.

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His was piped also. So if you figure I paid $175 to have my clutch machined, $250 for my HMF duals and $210 for the (2) pistons than my machine is doing very well against a quad that cost about $3000 MORE than what I paid for mine brand new.

I was holding my own pretty well against the 450's with my green V in short, 400' drag races at the dunes this past summer with just bolt-on mods and a stock motor. I think we have the advantage on the holeshot but if the races were much longer, they would have passed me. In the shorter races, they had to do everything correctly (holeshot, no missed shifts, shifting at right RPM, etc) or I would beat them pretty bad.

buddy of me n dixies yfz450 is piped(sparks), jetted n airfilter and we cant touch him . . . .

^^^ My old yfz had the same mods as that one, but it was hmf ful exh, and cam mod and it seemed faster than my v is. I guess I will have to buy some parts soon.

i have tried just doing the piston i went to a 800 and it wasnt much differance.. its the cams and piston combo that makes so much power. I think fundy and fst have kits that are priced pretty well and you wont need porting to beat yfz's. I think the 730cc big bore are the best bang for the buck.

Jrenigar, you can buy wiseco standard bore pistons for about $100 each and then order up some FST stage 3's and the yfz will no longer be a problem.

Cams are where the power is with these machines

if your only doing one or the other get pistons.. then when you get the money for cams its only a matter of a couple of hours to put them in..

Thanks for all the advice, Im probably going to do what sped force and kujo recommended. Im assuming any weisco pistons will do? What comp do I need for 93 octane with a 6 deg key?

JRENIGAR said:

Thanks for all the advice, Im probably going to do what sped force and kujo recommended. Im assuming any weisco pistons will do? What comp do I need for 93 octane with a 6 deg key?

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i think shelf wisecos are the same comp ratio, around 11:1 which is no problem with 91 or possibly lower octane.. i ran a fundy 820 11.5s on 91 and +6 timing without any problem.. alot of guys on here are running over 12.5:1 pistons on 93 with no problem..

ive got a 800 with cams upps and 36s with stg 3 clutch
mate has a efi yfz450r with ported throttlebody full pipe and filter with fuel controller and were neck and neck if i do even the smallest thing wrong hes gone and hes 125kgs on his 450