QUOTE (blackmagic250R @ Jun 18 2010, 09:54 PM)

QUOTE (Morgan @ Jun 18 2010, 02:27 AM)

Dollar for dollar motor wise the 450R wins. Easiest motor as of right now (besides the 700R) to make quick, easy power out of. Each bike makes power differently and not all HP numbers will yield the same results. I can tell you that it will take a 75HP 250R to run with a 60HP 450R.
A good 310-330 on gas should be in the 55-58 HP range. A 450R with the same added CCs with a good head would be in the 65-70HP range, bye bye 250R.
no way jose,
dollar for dollar 250R wins, a nice 65HP stock bore/stroke 450R will cost you 2K and then some depending on cams, springs, valves, who does the porting. for 2K you can build a legit 250R that will smoke 95% of the bikes your roll up against.
there will always be guys like morgan with amazing sleeper 450's, but the medium to average 450R with pipe, intake, and cam will not hold up against a $599 310ESR bolt on kit.
I still pull a bike length on 450's all day long at the drags with a 1985 250R three wheeler with a pipe, 38mm carb and my own porting ON A STOCK CYLINDER, in no way is the bike special, but it gets the job done.
Ive owned them both and what I find funny is the 4 stroke guys will never tell the "truth" these 4 strokes are not lower maintenance, you will beat your valve into your head in any performance application, VALVES alone can run you up to 200 bucks, springs another 150, and the list goes on and on. My 250R's have run the same top ends for over 5 HARD years of running, i dont baby them at all and they still keep coming back for more. and guess wat? a hone and piston will run me 250.00 bucks and Ill be back into the dunes. try doing that with a 4 stroke (your talking piston, guides, valve job etc).
This debate has been done over and over again, and people will hop on the 4 strokes for ever bandwagon and roll off into the sunset with receipts up to their eyeballs.
Power wise the 4 strokes has not flat out surprised me, they are very impressive and I myself owned a very fast 450R before I sold it, but money for money it didnt beat my banshee's or 250R's with the same amount of money...
One more rant before I leave, I have a Cheetah 421PV Banshee, the top end and crank complete cost me 2400 bucks and made alittle over 100RWHP. Take and dump 2400 bucks into any fourstroke on the market and try and get that level of performance.
with the new Puma top-ends for 250R's it just starts this craze all over, 80hp 250R race gas motors are not abnormal anymore.
Where to start...Well I can count the amount of "legit" 250Rs I have ever run across on one hand. ESR's bolt on kits are lesssssssss then stellar. Only if Jay or Eddie himself does the work are they ever good IMO. The $599 plus money for carb, pipe, yadda yadda, so say your into it a grand..Same amount on a 450R pipe, intake, cam, etc. setup right, gearing, weight reduction ( since the 250R is lighter to begin with) and GLIDERS will walk that same 310. Done it many times. 4 strokes are very reliable even modded, just need to know the right parts to use. Ever foul a plug on a 450R out in the middle of the dunes? Nope. For an average non-mechanical duner I would suggest the 450R day in and day out. Big bore 250Rs are not the bike to start out on with beginner mechanical skills. Like you said this could be argued for days and each person can and will make a valid point. But 2 strokes are not as user friendly as 4 strokes.
There are a FEW Pumas out there that make the power you stated, and they are not on gas. The Puma is a VERY specific combination of parts to run well. You start to stray from those parts and the power dwindles, 5-8HP per item. And talk about a big money motor! 5-6 GRAND for the right combo of parts.
Banshees, eh, nothing out there is going to beat a Banshee except another Banshee. This again is where I talk about HP not being equal. Most Cubs are in the 92-95 range on gas as a 421. It only takes a 60HP 4 stroke to run with a 4 mil. I've got video of my white bike at 65+HP running side by side with two different 7 mils on this site.
I do agree that it takes money to go fast. But I still think that dollar for dollar the 450R wins. I have seen some big time "Inner Circle" ESR 370 motors and it took a ton of "grasping at straws" work to get them to make the power that they did (72 HP) and neither was a cheap build. I can make 72 with a 450R with my eyes closed.
Im gonna be happy at 65 or 70 with this Sphynx. I hope I can still ride, cause I have a feeling Im going to need to make up some difference.