XR650R vs XR400
Posted June 04, 2004 - 07:54 PM
Posted June 04, 2004 - 09:50 PM
Posted June 05, 2004 - 03:38 AM
It is an awesome bike. I left the woods with one markedly vivid thought: "These woods are TINY now..."
Posted June 05, 2004 - 07:07 AM
Posted June 05, 2004 - 12:07 PM
Posted June 05, 2004 - 12:27 PM
Posted June 05, 2004 - 05:34 PM
Between the 400 and the 650, I'd buy the 650 hands down and I'm not a big guy at 5'7" and 165 lbs. I can go faster on that bike even in the tight stuff because of the better suspension and handling. Once it opens up, it's not even close. Also, my buddy installed the higher pressure radiator cap after the first ride and his bike has not overheated since so to me that's not an issue with the 650's.
The 426's feel A LOT lighter than the XR650R. I've weighed mine wet without fuel and it hits the scale at 265 lbs. with skid plate, bark busters and radiator guards. I haven't ridden a new WR450 but with the battery up high, I'm sure it feels heavy.
Posted June 05, 2004 - 06:19 PM
*** HP ***
2000 YZ426F 45.3 HP @ 9,000 RPM
2000 XR650R 48 HP @ 5,500 RPM
2000 XR680R 64 HP @ 7,500 RPM
*** Torque ***
2000 YZ426F 31.2 lb/ft @ 6,800 RPM
2000 XR650R 42 lb/ft @ 6,500 RPM
2000 XR680R 50 lb/ft @ 6,000 RPM
In regards to various bike weights, the May 2000 issue of Dirt Rider weighed the following bikes full of fuel, oil and ready to ride. Here's what they printed as honest full wet weights.
Honda XR650R = 302 lbs
Suzuki DRZ400E = 295 lbs
KTM520 E/XC = 272 lbs
Husaberg FE600E = 285 lbs
Honda XR400R = 278 lbs
Yamaha WR400F = 276 lbs
Kawasaki KLX300 = 271 lbs
Here are the ready to ride full wet weights for some more bikes, but I got these figures from owners who posted in the Yamaha & Suzuki TT forums that weighed their bikes filled with oil, gas and ready to ride.
2003 WR250 = 253 lbs
2001 WR426 = 265 lbs
2001 YZ426F = 266.8 lbs
2003 WR450 = 269 lbs
Posted June 05, 2004 - 07:36 PM
An uncorked XR650R produces close to 42 lb/ft of torque at 5,500 RPM and close to 48 rear wheel HP at 6,500 RPM. The CRF450 comes stock as a full fledged race bike and produces about 29.5 lb/ft of torque at 6,500 RPM and 40 rear wheel HP at 8,000 RPM. The CRF450 has a much broader powerband that's very linear and it will keep pulling where the XR650R falls off in the RPM range, so naturally it will feel faster to some people. Gearing also plays a big role in all of this.
A modified CRF450R that includes a special cam grind that's installed to the correct degree with higher performance valve springs, retainers, guides, porting, 12:5.1 piston, power now valve, Doma exhaust and running Nutec Special 5 fuel produces about 34.7 lb/ft of torque 7,200 RPM and about 53.4 rear wheel HP at 9,200 RPM.
Now if you modify the XR650R with a 680 kit, cam, piston, header & exhaust, you can boost the torque to about 50 lb/ft at 6,000 RPM and raise the rear wheel HP to 64 at 7,500 RPM.
If you take the total torque of the bikes and divide it by the weight of the bikes, you'll get a better idea of the power to weight ratios.
CRF450R @ 29.5 / 225 = 0.1311 lb/ft torque per lb of bike weight.
CRF450R modified @ 34.7 / 225 = 0.1542 ft/lbs torque per lb of bike weight.
XR650R @ 42 / 277 = 0.1515 lb/ft torque per lb of bike weight.
XR650R modified @ 50 / 277 = 0.1805 lb/ft torque per lb of bike weight.
It's hard for me to beleave that a YZ426F can put out 45.6hp to the rear tire but, that's because it isn't RED I see some numbers that float around of guys with his 650R's putting out 64hp and others with 680'putting out 68hp. I want mine to put out that much it's only right to keep all the numbers right 680cc and 68hp
Posted June 05, 2004 - 08:10 PM
I got this off Erics Pig Pen:
I'm familair with that info because I wrote it and Eric put it on his site There's a lot of factors that account for differences between dyno testing including the dyno itself. Here's an XR680R dyno chart for you to check out while you're eagerly awaiting your bike
And here's the article with more info...
Check out what Ron Hamp has done with this YZ450F...60 ponies! And the 2nd link is to a CRF450 with close to 60 ponies.
I can't wait to hear the outcome of your 680 even though I know it will be first rate & completely reliable. I've been comtemplating this upgrade for a while and I'm definitely jeallous of your bike. Heck, maybe even Rob will be jeallous of your bike after he's done with it
Don't worry, it won't be long before one of your kids decides he likes your bike better and then you'll have some more decisions to make From the pictures & vids I've seen, your kids are getting pretty good
Posted June 06, 2004 - 06:36 AM
Posted June 06, 2004 - 04:16 PM
Posted June 06, 2004 - 06:08 PM
How do others get 64hp readings for a XR650R and 68hp readings for a XR680R? If Barnum is getting 58hp and your getting 64hp out of the 680 getting 68 is quite a jump. Are these Motard?
I dunno exactly how they get those big numbers, but their porting work must be very good in combination with a special cam grind, higher compression, etc. I'm not in the business of building these engines and only get to tinker on a few of these bikes just for the fun of it. Those are both Motard & flat tracker bikes in the dyno charts I provided that were getting those big numbers. I always view peak numbers as subjective anyway and don't trust them 100%. Unless you can put each and every bike on the exact same dyno under the same exact conditions with the same dyno operator, etc, the results can be pretty subjective. My bike puts out a bit more power than a stock uncorked with my Hotcam, pumper carb, exhaust, airbox mod, etc, but nowhere near the numbers on those dyno charts. I'm guessing that my bike in its current state is probably close to where your bike currently is powerwise, maybe a little more or a little less powerwise, but your 680 will soon make mince meat out of my bike
Posted June 06, 2004 - 07:12 PM
Posted June 08, 2004 - 04:56 PM
Get the XR650R rather then the 400. People will give you pros and cons as to which one is better, but it all boils down to this. I have heard about a thousand people say they wish they had gotten a bigger bigger bike, but have NEVER heard anyone say they wish they had gotten a smaller bike.
Had one. Was too big. WIshed I'd gotten a 400.
Posted June 14, 2004 - 01:49 AM
Posted November 17, 2009 - 06:54 PM
Posted November 17, 2009 - 07:07 PM
Absolutely no question, the 650! The 400 would feel pretty lame as a road burner without lots of engine mods.
What about if building a super motard street legal bike, modified XR400 or XR650R?
Posted November 17, 2009 - 09:39 PM
My brother and I went riding several times in the Buttercup / Glamis / Gordon's Well area. I was on a stock 85 CR500 and he was on a stock 2002 XR400 and both of us had 10 paddles. We both weight around 215 LBS and both bikes performed nearly the same. I thought I would kill him, but much to my surprise he climbed every hill and did everything as fast as I did. The XR400 ran perfect and never flinched. As a matter of fact it still runs perfect and my old CR500 was dead years ago. I still miss the 2 stroke powerband though:eek:
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