446 problems, motor build

[beastlywarrior228]

i actually heard of someone putting huge valves and crazy porting in a warrior head and getting huge flow numbers but i didnt see anything to back it up or to see how useful it was

 

[duneracerweston]

ya he was on the site like a year ago? claimed +2 intake valves and a +1 exhaust valve. id like to try that on mine but im a chicken and to nervous to screw up the port work on it

 

[beastlywarrior228]

na someone talking about a warrior his dad built awhile ago

but im sure if you send you head to rage theyll get some crazy flow out of it. ive seen what they do to raptor 250 motors

 

[jasonp]

yep mine will be with the je now, actually looks like well have the exact same setup. so its a 36mm carb correct

You are correct.

What cam you going to run?

In my opinion I would run a .005" copper base gasket and est 85mm custom head gasket from cometic. Make sure and ask for the thinnest gasket in est they make. That should get you close to the correct deck height.

You will have to get an adjustable cam sprocket and advance the cam timing like 7.5 degrees to get you back to stock.

I would also make sure the head and cylinder mating surfaces are in good condition. I would cut .010-.020" off the head get some more quench area.

Have the head ported at fourstoketech.

 

[jasonp]

hmmm, i guess i can go with that..

it would just make more sense to run something like a 39mm like they do on a 450 but thats just me. it must have about peak flow characteristics

450's have 4 to 5 valves so there going to flow more air and also have high velocity then a single valve setup. Also just look at the valve train on say the yzf450r. Dual cams, buckets, no rockers. It really is like comparing like a f1 car to a regular old 350 engine.

 

[jasonp]

ya he was on the site like a year ago? claimed +2 intake valves and a +1 exhaust valve. id like to try that on mine but im a chicken and to nervous to screw up the port work on it

Anything bigger then +1 you have to deal with shrouding.

 

[duneracerweston]

450's have 4 to 5 valves so there going to flow more air and also have high velocity then a single valve setup. Also just look at the valve train on say the yzf450r. Dual cams, buckets, no rockers. It really is like comparing like a f1 car to a regular old 350 engine.

but its the same cc's turning similar rpm's? right? for good performance gains wouldn't it help to have a bigger carb?

im still wrapping my head around this idea of it needing a smaller carb but it has the same displacement

 

[jasonp]

but its the same cc's turning similar rpm's? right? for good performance gains wouldn't it help to have a bigger carb?

im still wrapping my head around this idea of it needing a smaller carb but it has the same displacement

No a stroked warrior engine really is not going to be able to turn that kind of rpm a 450 can. Now it's not just the head the limiting factor here it's going to be piston speed and bore vs. stroke and how square the engine is.

 

[beastlywarrior228]

You are correct.

What cam you going to run?

In my opinion I would run a .005" copper base gasket and est 85mm custom head gasket from cometic. Make sure and ask for the thinnest gasket in est they make. That should get you close to the correct deck height.

You will have to get an adjustable cam sprocket and advance the cam timing like 7.5 degrees to get you back to stock.

I would also make sure the head and cylinder mating surfaces are in good condition. I would cut .010-.020" off the head get some more quench area.

Have the head ported at fourstoketech.

megacycle 252x1 with fst porting and +1 intake valve. im using a cometic gasket set. its all stuff that i got when i bought the 446

 

[jasonp]

megacycle 252x1 with fst porting and +1 intake valve. im using a cometic gasket set. its all stuff that i got when i bought the 446

Copy that.. That is the same cam I'm running. It's a little big for the 366cc so make sure and get as much static compression you can that will help with all the overlap this cam has.

 

[beastlywarrior228]

ya thats why i went with the 10.5 85mm je. i was worried the 12-1 would still be a bit too much. im gonna try and advance the timing a bit. also what do you think about that flywheel key

 

[DeadLastRacing]

In my opinion I would run a .005" copper base gasket and est 85mm custom head gasket from cometic. Make sure and ask for the thinnest gasket in est they make. That should get you close to the correct deck height.

You will have to get an adjustable cam sprocket and advance the cam timing like 7.5 degrees to get you back to stock.

I would also make sure the head and cylinder mating surfaces are in good condition. I would cut .010-.020" off the head get some more quench area.

Have the head ported at fourstoketech.

GREAT info Jason, good to have you back. I'm doing head work now so all this if deff going to come in handy.

 

[beastlywarrior228]

i may end up swapping for the megacycle 252x2 if this ones not enough bottom end

 

[jasonp]

ya thats why i went with the 10.5 85mm je. i was worried the 12-1 would still be a bit too much. im gonna try and advance the timing a bit. also what do you think about that flywheel key

If you take your time and get the correct gasket thickness it will bring that 10.5 to around 11.5. Shoot for 225 psi cranking compression. 12-1 will be a little much for pump gas.

Flywheel key will make it hard to cam time if you going to use adjustable cam sprocket, but it might be the only way now to advance the ignition timing as dynatek has stopped selling there programable cdi boxes for the warrior.

The other thing is. Watch your valve clearance on the exhaust valve if you run that .450" cam. I had problems with mine as I started to bring back the cam timing to stock. That is another reason I don't recomend running this cam with that piston,not unless you want to have the piston fly cut or be ok with cam timing being a little retarted.

 

[beastlywarrior228]

i think i have an adjustable cam gear, you recommend 5 degree of advance maybe

 

[jasonp]

i think i have an adjustable cam gear, you recommend 5 degree of advance maybe

You can check it out and see where your at after you get it together. I can tell you from building a couple warriors that if you do lower the cylinder and head you will have to adjust up to 7.5 degrees advanced just to get you back to the stock marks.

This will also bring your cranking compression back up, dynamic compression and move your power band lower which is going to be needed with that big of a cam. Most I would go is the web .430" cam with a stock stroke, that is still a little big.

 

[beastlywarrior228]

yep the problem i have is i already have a cometic gasket set, should i just use the stuff in a tube instead like weston

 

[jasonp]

yep the problem i have is i already have a cometic gasket set, should i just use the stuff in a tube instead like weston

Can you measure the gasket thickness?

You can, just make very sure the head sits square on the cases otherwise you have some problems.

 

[beastlywarrior228]

Can you measure the gasket thickness?

You can, just make very sure the head sits square on the cases otherwise you have some problems.

With calipers? Ill check tonight

Dude your scaring me out of this cam

 

[jasonp]

With calipers? Ill check tonight

Dude your scaring me out of this cam

Sorry about that I ment cylinder to case, not head.

Yeah it's a really big cam. It's great for the stroker. I would try it and see and if you need more all around power or bottom end you can always change it out. That is very easy to do.. and you can get your money back out of that cam and buy another one.

Just remember watch your exhaust valve clearance at TDC with this cam.. make sure and check it.