More Power/Speed without Boring/Stroking

[teamyardsale]

Hey guys, I got a friend who set up his 500 Sportsman really nice, I convinced him into buying a supertrapp exhaust and get some clutching done from AAEN performance, he also runs 25" mudlite XL's (25" is stock size, just more aggressive tire).

He could beat me on top-end by 5+/- mph stock. We havent raced again yet (winter=snow) but I dont want to be totally blown away when we do, even winning would be nice

Im running a FMF Powerbomb Header with the Powercore 4 Muffler.

I also have the K&N air filter and an outerwears with stock box/lid on.

My carb is jetted for this setup (or so I was told)

Later on this winter I will be changing my stock gearing to a 38 tooth rear, if I find I loose to much torque, I will go to a 39, and a 40 (stock) If im not impressed with either.

My warrior has gobs of low end power, and I love it, being able to pop wheelies whenever I want. But what could I do without dumping more than 300+/- into it for more overall acceleration and top-end?

 

[97warriorrider]

wow are you serious that the sportsman beat you...I could always blow them away..what size rear tires are you running..for a cheap mod for more top speed trie going up a tooth on the countershaft sprocket..Or you could get a cam, high comp piston, valve springs and run his ass right in the ground

 

[yamarider]

The best thing you can do for the top end is a good cam. The stock cam has no top end at all. I'd say at least a webcam .430, if you want to go real extreme you could go .450 but you'll loose some low end power with that. A megacycle cam might also be a good one.

 

[jasonp]

The best thing you can do for the top end is a good cam. The stock cam has no top end at all. I'd say at least a webcam .430, if you want to go real extreme you could go .450 but you'll loose some low end power with that. A megacycle cam might also be a good one.

I think those racing cams with a stock piston would be just a little to much, you would a bunch of low end torque, where if you were to put a high compression piston it would help bring some of that back. I see though it doesn't look like he wants to go that deep. I do agree that really helps wake the top end up on a warrior.
I would sugest maybe a torque cam to go with that stock piston that way you still don't lose the torque but give your engine a boarder torque range and help get a little more power to the top end.
Like a web .390 or Megacycle 252x2. Web being more all around and hit in the mid range while the Mega more all out torque. Both will still have more top end then the stock cam.
I would open up the air box as the stock one doesn't flow to well with the lid on. You'll have to re-jet the main and the pilot but that is not to hard.
Go up a tooth on the countershaft sprocket and that should give you enough speed to take him.

 

[yamarider]

true. Usually people install the high compression pistons before or at the same time as the cam, so I really don't know if a .430 would be too much or not.

 

[teamyardsale]

Whats a "cam"? NooB quyestion, and do I have to pull my engine out? I really don't feel like going that deep. And I dont feel like messing with pistons.

 

[jasonp]

Yeah, if your asking that question then I would sugest that you don't go that deep.
Open up the air box if the riding conditions permit. Rejet. Go up a tooth on the counter shaft sprocket and you'll be good to go.

 

[yamarider]

Yeah, if your asking that question then I would sugest that you don't go that deep.
Open up the air box if the riding conditions permit. Rejet. Go up a tooth on the counter shaft sprocket and you'll be good to go.

Agreed

For future reference though, the cam is the part in the head (above the piston) that spins on a chain, and opens and closes the valves to let air in and exhaust out.

 

[97warriorrider]

are you serious?? A camshaft??

 

[ncwarriorrider]

Whats the highest compression piston you would reccomend for safely running on pumpgas? I'm starting to crave more power as well and I'm thinking a webcam .430 and a higher comp piston would help me get started or would you reccomend just getting the hot rod's 396 kit and a .450 cam all at the same time?

Apologize for potential thread hijacking, me and the original poster just seemed to have a very similar question.

 

[yamarider]

11:1 is the highest you're going to be able to go on pump gas with the warrior.

It depends on how much work you want to do installing the kit. The hot rods kit will take a lot more work to install, but you'll also get a big boost in power from it. I want to get a hotrods 400 stroker in mine sometime, they're nice for the money and you don't have to deal with getting the cases machined like the bigger kits.

 

[teamyardsale]

can you guys set up some links? If im gonna do this Ill start now so I can be able to ride it during summer. Do I have to adjust my valves?

 

[ncwarriorrider]

11:1 is the highest you're going to be able to go on pump gas with the warrior.

It depends on how much work you want to do installing the kit. The hot rods kit will take a lot more work to install, but you'll also get a big boost in power from it. I want to get a hotrods 400 stroker in mine sometime, they're nice for the money and you don't have to deal with getting the cases machined like the bigger kits.

I'm figuring if I'm going to tear into the motor I might as well get the power upgrades I'm looking for done all at the same time, so i guess its time to start saving the pennies.

 

[yamarider]

I think the best prices for the hotrods stroker and piston kit are on www.atvparts.biz, at least they used to be the cheapest at around $530 for the full kit.

When you install the cam you will have to adjust the valves after the installation, the new cam will have different clearances and specs.

 

[jasonp]

Yup, the 400 stroker kit is great for the money.

 

[teamyardsale]

Yup, the 400 stroker kit is great for the money.

I can't see how you became a mod, you have done nothing but bring my topic out of what I am asking.



BACK ON TOPIC


What would you guys do for gearing? Im gonna go from http://www.magic racing.com and get the F/R Sprocket and Chain setup, not the race one I think they call it "pro" Its the O-ring chain. What should I do for sprockets? the stock 13th front and a 38th rear or a 14th front and the stock 40th rear?

(up on the front=more speed and down on the back=more speed correct? and vice versa for torque)

 

[97warriorrider]

wow..calm down..the kit from magic is def. worth the money..i bought it for my warrior last summer during my build and its great

 

[jasonp]

[quote:l0dzg1o2]Yup, the 400 stroker kit is great for the money.

I can't see how you became a mod, you have done nothing but bring my topic out of what I am asking.



BACK ON TOPIC


What would you guys do for gearing? Im gonna go from http://www.magic racing.com and get the F/R Sprocket and Chain setup, not the race one I think they call it "pro" Its the O-ring chain. What should I do for sprockets? the stock 13th front and a 38th rear or a 14th front and the stock 40th rear?

(up on the front=more speed and down on the back=more speed correct? and vice versa for torque)[/quote:l0dzg1o2]

Listen up JR.
I've done nothing to help you out on this deal.
You should re-read you're own thread here and then read it again. Then figure out where I moved your thread off topic.
All this engine work is going to give you more speed when you gear up so the engine can pull the gearing, so in a since it's here to give you your options.
I think before going off at me you should consider the fact that I'm am here to help you. So you want me to help or what?
Lastly I recomend you have a look around and open you're eyes the questions your asking are not new.

 

[yamarider]

What would you guys do for gearing? Im gonna go from http://www.magic racing.com and get the F/R Sprocket and Chain setup, not the race one I think they call it "pro" Its the O-ring chain. What should I do for sprockets? the stock 13th front and a 38th rear or a 14th front and the stock 40th rear?

(up on the front=more speed and down on the back=more speed correct? and vice versa for torque)

Most guys just change out the front sprockets to different sizes and leave the rear the stock size, but since you're changing out both of them, it makes more sense to me to go with 13/38. There's not much of a difference, but the smaller rear sprocket will give you a little more clearance between your sprocket and skid plate so if it gets bent up some it won't be as quick to rub.

 

[dave76]

First of all don't question why somone is or isn't what he is, you have like 37 posts so that means you havn't been on here long enough to start badmouthing anyone. Jason is a mod because he knows his ****.


What your asking for on a stock motor is just not going to cut it. The stock motor puts out about 18HP at the rear wheels, and when properly jetted with a pipe and a good airfilter increases to about 22HP. Thats all she wrote. My experience with doing theses perticular mods is the motor revs freely now right to the point of valve float which kills HP and it'll fall flat on it's face. The quad has a very low MPH due to the valve floating issue which Yamaha designed into it. Adding a good aftermarket cam and springs will do wonders, so will a higher compression piston. Hope this will answer all your questions.