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Old 04-28-2011, 11:10 AM   #8386
KASUYAHO
Road Hog
 
Joined: Apr 2006
Location: Aussie Land
Oddometer: 3,452
Quote:
Originally Posted by jesusgatos View Post
Hey, so I'm just wondering: where is the sweet(est)-spot in the XRR's powerband? Mostly thinking about sustained RPM's and gearing for fuel economy. Best MPG is going to be somewhere around where the engine makes peak torque, right? Had my bike on a dyno a few years ago, but didn't get printouts and don't remember...
I wouldn't be gearing it to be reving at the max torque all day.
Pointless really IMHO.

Max torque @ 6,750rpm Max engine speed 9,300rpm, stock 8,750 RPM

Torque curve is broad with the BRP, from 5,000 to 6,750.

Off the gearing calculator

6,750 RPM 9,300 RPM
Gearing max power mph/kph max speed mph/kph
15/47 90/143 123/197
15/45 93/150 129/206
15/43 98/157 135/216
15/41 103/164 141/226

5,500 RPM mph/kph 8,750 RPM mph/kph
15/47 73/117 116/186
15/45 76/122 121/194
15/43 80/128 127/203
15/41 84/134 133/213

As a guide only
Those max speeds are calculated from gearing ratio's only,
not real life if your engine hasn't got the power to pull top gear.

Top gear RPM's at close to 60MPH / 100KPH using gearing calculator.
RPM also changes due to tire roll out / diameter.

Gearing Speed MPH/KPH RPM
15/47 60 / 95 4,500
15/45 60 / 95 4,300
15/43 60 / 95 4,100
15/41 60 / 95 3,900 Standard Aussie gearing
14/48 60 / 95 5,000 Standard American gearing

KASUYAHO screwed with this post 04-28-2011 at 06:01 PM
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Old 04-28-2011, 11:19 AM   #8387
tennessee thumper
now in Mt. View, AR
 
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Joined: Nov 2007
Oddometer: 632
Regarding the Vapor....same deal for me, when it feels like it, the battery shuts off and I'm back to 0. Battery is fine, it was just replaced.

I think the battery is getting pinched or the terminals are dirty, something keeps shorting it out. I can apply pressure to the unit and it comes back on and works fine for a while, then goes blank when it feels like it.

I've had it apart a few times...if someone comes up with something to try I'm all ears....works fine as a speedo, just dont count on keeping up with the mileage for fuel stops.
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Old 04-28-2011, 12:22 PM   #8388
Agent2
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Joined: Apr 2011
Location: Firestorm Alley, California
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New guy here, actually I joined just to read Jo Mamma.
This place looks nice, lots more 650R riders than the "other" sites.
On the front tire, I ran a Maxxis, way to slippery. Pirelli XCMH works great in desert conditions, wears good, and is DOT legal if you are plated.
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Old 04-28-2011, 01:15 PM   #8389
brad21
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Joined: Aug 2006
Location: Gardnerville, NV
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I've got Dunlop MX71's front and rear right now. Work well around here and in Baja.
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Old 04-28-2011, 01:17 PM   #8390
ktmnate
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Joined: May 2003
Location: Somewhere
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Quote:
Originally Posted by Agent2 View Post
New guy here, actually I joined just to read Jo Mamma.
This place looks nice, lots more 650R riders than the "other" sites.
On the front tire, I ran a Maxxis, way to slippery. Pirelli XCMH works great in desert conditions, wears good, and is DOT legal if you are plated.
I didn't care for the Maxxis front either. I tried it two different times. Once on a KTM 640 adventure. And it was like the others have said. It just didn't feel planted. And then on a KTM 950 in Death Valley and I was downright scared. I think it works good on the lighter bikes. But on the 950 it was just wrong. Regardless of pressure (15-25psi), it howled like crazy. I have had good luck both on and off road and in Mexico with a Dunlop 739faj front. Even on the 950.

Nate
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Old 04-28-2011, 02:26 PM   #8391
chip
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Joined: Jun 2005
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put the ricky stator in the pig last night. is it me or is my bike faster now?
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Old 04-28-2011, 04:42 PM   #8392
Ridin Dirty
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Joined: Apr 2008
Location: WMASS
Oddometer: 178
88 mph

Quote:
Originally Posted by chip View Post
put the ricky stator in the pig last night. is it me or is my bike faster now?
You must have gotten Ricky's Flux Capacitor.
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Old 04-28-2011, 05:35 PM   #8393
opcocrg
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Joined: Mar 2010
Location: Abq. N.M.
Oddometer: 146
took what I'm going to call a "confidence ride" today. it's the farthest from home I've been on the BRP since I got it. I rode a little over 120 miles and I'm pretty happy. what worried me was all the tinkering I had to do after I bought it to get it road ready since it sat without being ridden for a couple of years. I've been bouncing around town here and there stretching the distance from home each time and felt like it needed to be trusted on a longer ride so I could gain some confidence in it. It's definitely a whole different animal than my ZX10 (which I haven't ridden since I brought the pig home) but I can honestly say it was a lot more fun. My ass is a little upset with me but for the most part it was pretty tolerable. With a slightly wider seat I can see this thing being a fairly worthy adventure bike. The only thing that bothers me is that it seems to be sucking down fuel a lot faster than I thought it would. I haven't done any math on how much it's consuming yet, it just seems to suck it back pretty quick.
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Old 04-28-2011, 06:03 PM   #8394
KASUYAHO
Road Hog
 
Joined: Apr 2006
Location: Aussie Land
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Quote:
Originally Posted by brad21 View Post
I've got Dunlop MX71's front and rear right now. Work well around here and in Baja.
How is the MX71 going for wear Brad ?
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Old 04-28-2011, 06:15 PM   #8395
RENCRN8
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Joined: Aug 2007
Location: Loveland, OH
Oddometer: 250
So I picked up this little peach last night as a project. 2002 XR650R
Dualsported already, some farkles, and most importantly seized engine....
$500



Took off the clutch cover and oil filter housing real quick to have a looksee. Realized I couldnt find my clutch hub holder tool so can't check the clutch bushing, but there sure is a bunch of free bling in the oil filter...



So this weekend I will tear into the motor to see what the damage is. Any thoughts on motor builds? Stock, 680, etc etc?

I really would like to end up with a cheap running bike, but I already have a stock motored XRR so maybe a HP beast would be fun too.....
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Old 04-28-2011, 06:26 PM   #8396
dirtard
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Quote:
Originally Posted by RENCRN8 View Post
So I picked up this little peach last night as a project. 2002 XR650R
Dualsported already, some farkles, and most importantly seized engine....
$500


So this weekend I will tear into the motor to see what the damage is. Any thoughts on motor builds? Stock, 680, etc etc?

I really would like to end up with a cheap running bike, but I already have a stock motored XRR so maybe a HP beast would be fun too.....
since u already have a stock motor xrr id say you should build the crap out of that motor and make it a motard.
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Old 04-28-2011, 06:31 PM   #8397
RENCRN8
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Location: Loveland, OH
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Quote:
Originally Posted by dirtard View Post
since u already have a stock motor xrr id say you should build the crap out of that motor and make it a motard.
The thought has crossed my mind for sure....

I really need to get a handle on how much $$$$$ we are talking in a motor build......and some tard wheels.....
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Old 04-28-2011, 06:58 PM   #8398
RideFreak
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Joined: Apr 2009
Location: County Lockup, NM
Oddometer: 5,321
Quote:
Originally Posted by RENCRN8 View Post
So I picked up this little peach last night as a project. 2002 XR650R
Dualsported already, some farkles, and most importantly seized engine....
$500



Took off the clutch cover and oil filter housing real quick to have a looksee. Realized I couldnt find my clutch hub holder tool so can't check the clutch bushing, but there sure is a bunch of free bling in the oil filter...



So this weekend I will tear into the motor to see what the damage is. Any thoughts on motor builds? Stock, 680, etc etc?

I really would like to end up with a cheap running bike, but I already have a stock motored XRR so maybe a HP beast would be fun too.....
Looks like it ate the thrust washers on the big end which is a known issue. Honda had some QC issues on the crank for awhile. Figure a crank rebuild at a min.
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Old 04-28-2011, 07:30 PM   #8399
Agent2
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Joined: Apr 2011
Location: Firestorm Alley, California
Oddometer: 127
If you are running an Edelbrock pumper, and if you don't already have them, couple of links, a schematic and a copy of the "owners manual"

http://www.edelbrock.com/motorcycle/..._internals.pdf

http://www.edelbrock.com/automotive_...ad_install.pdf

Not sure if it has been posted before, way too many pages to check.
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Old 04-28-2011, 08:20 PM   #8400
HickOnACrick
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Joined: Dec 2007
Location: Utarded in Lubbuttock
Oddometer: 2,494
Quote:
Originally Posted by opcocrg View Post
took what I'm going to call a "confidence ride" today. it's the farthest from home I've been on the BRP since I got it. I rode a little over 120 miles and I'm pretty happy.

I did the same thing on my new used XRR...for 2000 miles in Baja. I feel better about it now
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