stroker vs port

[shortzt.15]

Hi, i have a 426 and im looking at a Stroker and bumping it up to a 440 bore and a 4 mill stroke, so a 460, would that be better than porting my head, i mean i plan on that down the road, also with an 11:1 piston what mods has to be done to run a stroker crank, ik the piston skirt should be shaved, but do i have to shave off the top of the piston for the extra stroke or?, any help would be nice

[CJM]

You would seriously be better off just buying a 450r if your looking for that kinda power.

A stock 06+ R puts out roughly 40hp, you will be making 40hp with a stroker or port work or perhaps close.

If you really want to keep working on the EX do the port work. Much easier and gains are impressive in most cases.

[shortzt.15]

My problem is im only 15 i have about $1200 total in my 426 i can get about $1700 if i sit on it long enough mabey, $1800 ,and then sell my bike for 700 thats still not enough for a 450, and how reliable would a 450 be compared to stroked 440?

[CJM]

450 is much more reliable b/c your not doing any real work.

Unless you race theres no real point to even bother with having the fastest bike. I can beat my buddys on a 300ex if need be so long as we arent drag racing.


It is your money, but there is only so much you can squeeze out of the EX. When a 450 can basically be making the same power stock.

Id leave the 400 alone and just keep riding it.

[shortzt.15]

I got looking and can pick up a 04 450r for about $2500 is that a good deal

[JOHNDOE83]

keep searching for deals and try not to buy on impulse, If i search craigslist and ebay everyday for what im looking for, ill find at my price sooner or later.

I see 450rs sell for $1800 in my area, but you have to be patient and look for a good deal.

[CJM]

Agreed, Ive found Rs for 1800 very easily.

Honestly the 04-05 kicker has less power but a better trans than the 06+. 06+ has a better topend with more power and more support tho, but as said trans is weak. Also uses titanium valves that wear out, older motor uses steel.

I got the kicker, a 12:1 piston and some porting make 50-55hp easy.

[ish416]

I got the kicker, a 12:1 piston and some porting make 50-55hp easy.

You will need quite a bit more than a piston and porting to get anywhere near 50hp on an old 450R...

[CJM]

Originally posted by ish416
You will need quite a bit more than a piston and porting to get anywhere near 50hp on an old 450R...

Really? Id say your very wrong, heres just one example: http://www.garyhott.com/dyno-2012-JUL.html

After talking to john at RE and dee at rage they say its entirely possible.

I mean I didnt list the standard stuff like cam and exhaust but thats to be expected as part of a build usually.

[odog]

the stroker will be much faster but the price is also much higher and once you get a stroker you are going to need the port work any way to make the stroker even faster. so i would suggest getting the port work done if you cant afford the 450r.

[ish416]

Originally posted by CJM
Really? Id say your very wrong, heres just one example: http://www.garyhott.com/dyno-2012-JUL.html

After talking to john at RE and dee at rage they say its entirely possible.

I mean I didnt list the standard stuff like cam and exhaust but thats to be expected as part of a build usually.

This build that you quoted made 50.95hp and 34.07tq:

12:1 CP Shelf Piston (94mm stock bore)
Jug shaved .015" for 12.5:1 total compression
Wicked Motors Race Epoxy Porting
+1 Valves in all 4 corners
Hot Cams Stage 2 Cam (retarded 4 degrees)
DASA Intake
Airbox Lid Off
DASA/WPP Mod Filter
DASA Classic Exhaust
93 pump gas
Stock bore, stroke, carb, etc.
Jetting - 185 Main, 48 Pilot, HRC Needle 3rd Clip

My best friend has an 05 450R that was built by MXP and has very similar specs (12:1 piston, +1 valves, massive porting, cam, FCR carb, 06+ intake) to what you are referring to and dynoed at a very similar 51whp, so yes I do agree the power can be made. However, the last I checked, a shaved jug, massive porting and +1 valves are a bit more than "standard stuff like a cam and exhaust" and not quite as simple as "a 12:1 piston and some porting make 50-55hp easy."

I just don't want someone to read that, slap a piston, cam and mild porting on a 450R and think they have a 50 hp quad when in reality they would be around 45.

As for the OP, porting may get you a few hp but the stroker will get you much more. However, porting is relatively cheap, a stroker build is not and there would be no point in building a stroker without any porting.

I agree that if you want that level of power and are willing to pay for it you are better off just picking up a 450.

[CJM]

Ah ok, miscommunication thats all.

Id say you can easily reach 40hp with just the basics, anymore requires a port job and some other stuff.

[DragonGunner]

Powroll and someone else told me a stroker might get you 2 hp. Thats alot of money...they actually talked me out of it. You have to remember that the when the strokers came out, the 450's weren't out yet.....if you wanted a race 4 stroke the 400EX was one of the tops to choose from.....with the coming of age of the 450's ...well you get the picture. The other problem is no atter how much HP you get out of a EX, its still air cooled, and the the engine is going to get hot, and the hotter it gets the more HP you loose....can't remember the numbers but it does. A stroker is the one thing I always wanted to do, just to see, but the price for what you get just couldn't ever sway me....the $ I saved I put towards a build and motor that was a much better decision.

[slightlybent47]

Its not just raw power you need to be concerned with. What kind of riding or racing are you doing? Deferent builds will result in the power rolling on in deferent ways. Power is not the only important thing. What type of tracks are you riding?
It all boils down to USEABLE power.
A high revving monster won’t help you on tight trails or on small tight tracks.
Before you dump a bunch of money in a build, do some more research, there are many threads on this, just do a search.
Most of your power can be gained in some porting and head work along with compression.