thinking of juicing my motor up..suggestions

[platinum350]

Ok, I see a lot of you are putting the high compression pistons w/ cams. And of course going w/ the 416 to 440 kit. I am new to this so bare w/ me. What I want to know is, what should I do. I see on ebay they list the stock size piston but high compression. Would that make a noticable difference? Would I need a upgraded cam to go w/ that?
Or should I just get the 440 kit? Can I just get the new kit and a cam and be done?
Of course I will have my carb rejetted a pipe & filter. I really don't want to spend too much money so any suggestions would be appreciated!
Thanks!!

[400exrider707]

If you go with a 440 kit expect to pay a lot more. You will need more things to be done to your engine as well to get the full potential out of a 440, like bigger valves, hardface the rockers, stiffer valve springs and a bigger carb and yada yada yada. I'm in the same boat as you. I am wanting to bump my power up and do a fresh top end, I think I'm going with either the 406 or 416 bore w/ JE piston (maybe ross haven't decided yet) stage 1 hot cam and probably a new cam chain while I've got it apart and valve seals. I'm thinking this is like middle of the road, not cheapin out and just throwing in rings, but not going all out either. I'm a broke *** college kid so this will have to do for now.

[cals400ex]

you will want a cam. that cam makes a large difference. i would get a 406 or 416 with a cam. you will be able to get these, gaskets, and the boring for less than $400. you need to install it though. you will get a nice increase of power.

[platinum350]

see, I could see spending $400 on a 416 kit. Other than the cam and installing would that all I would need to do. Or will I need to hardface the rockers, stronger springs and all that?

[400exrider707]

You dont need to, but I'm thinking I'm going to do a couple of things as preventative maitenance seeing as Ill have the thing apart anyways. i think i'm just going to do valve seals and heavy duty cam chain.

[RAPTORAZ]

Here's my list:

Stage II Hotcam = $125
Ross 10.8:1 piston = $125
Bore cylinder and fit piston = $35
Honda gaskets = $25
Labor = FREE(did it myself)

Dynoed at 34 RWHP(piped YFZ's typically dyno at 29 RWHP on this same dyno) and has been trouble free for two years running on 91 octane fuel.

[400exrider707]

Thats basically what I'm going to do except I only want a stage 1 hotcam cause I ride a lot of trails too and do SX more than MX so I need the bottom end. Who did you get your ross piston through??

[RAPTORAZ]

Originally posted by 400exrider707
Who did you get your ross piston through??


I bought it directly from Ross.

[Kennethyfz450]

Dynoed at 34 RWHP(piped YFZ's typically dyno at 29 RWHP on this same dyno) and has been trouble free for two years running on 91 octane fuel. [/B][/QUOTE]

thats a bunch of bs... a stock yfz puts more to the rear wheels....... :p

[cals400ex]

i am wondering if he ment 39, which i thought a stock one put out that.

[RAPTORAZ]

Originally posted by Kennethyfz450
Dynoed at 34 RWHP(piped YFZ's typically dyno at 29 RWHP on this same dyno) and has been trouble free for two years running on 91 octane fuel.

thats a bunch of bs... a stock yfz puts more to the rear wheels....... :p [/B][/QUOTE]


Sorry, I meant Z400's. Don't know why I typed YFZ. My bad.:ermm:

Just for reference, a piped YFZ typically does around 38-40 RWHP on that same dyno.

[400exrider707]

did you get the lightweight pin for that ross piston as well? I cant see spending $30 on a light weight pin, but if it makes that much of a difference, which I doubt it does, it might be worth it. Just curious.

[RAPTORAZ]

Originally posted by 400exrider707
did you get the lightweight pin for that ross piston as well?

Nope.

[cals400ex]

Originally posted by 400exrider707
did you get the lightweight pin for that ross piston as well? I cant see spending $30 on a light weight pin, but if it makes that much of a difference, which I doubt it does, it might be worth it. Just curious.



i did, along with thermally coating the piston. i am not saying it helped because i did it all at once. i can tell you that with my stock carb on my bike it is quicker than my buddies when he has the fcr. i am running a bit different setup but not very much difference.