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Old 02-19-2008, 06:47 PM   #1
Yooper_Lee OP
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XR650L transmission ratios

Well, the winter is growing long here in Houghton, MI... and I've been thinking XR650L project bike. I used to design gearboxes for a living as a consulting engineer and was going to plot out the XR's gradeability and tractive effort with the factory gears.... only I cant find anything on them. Does anybody have specs on the factory primary, 1-5 and final drive set up for the L machine? If you get them to me I promise to post the results. I've ran the same numbers for the KTM LC4 and the F650 just to see what those designers were going for. Thanks!
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Old 02-19-2008, 07:02 PM   #2
kubiak
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maybe you can answer a question a lot of us 650l owners have,it seems most 650ls shift smooth except for the first to second gear change.its kind of rough on all the ones i have ridden.thanks!
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Old 02-19-2008, 07:15 PM   #3
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Quote:
Originally Posted by kubiak
maybe you can answer a question a lot of us 650l owners have,it seems most 650ls shift smooth except for the first to second gear change.its kind of rough on all the ones i have ridden.thanks!
The XR650L has a big jump from 1st to 2nd. The good side it that it widens the overall spread for more versatility. The bad side is the shifting you describe.

Gear ratios coming up.
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Old 02-19-2008, 07:19 PM   #4
kubiak
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does it cause any extra wear in the long run from notchy shifting or is it something i can just not worry about?thanks
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Old 02-19-2008, 07:23 PM   #5
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Quote:
Originally Posted by Yooper_Lee
Does anybody have specs on the factory primary, 1-5 and final drive set up for the L machine?
I guess for the XR650L I don't have the actual gear pairs, just the ratios. Here they are:
Primary 2.19
Final 3.00
First 2.67
Second 1.65
Third 1.25
Fourth 1.00
Fifth 0.84

Overall (primary*final*individual gear ratio):
First 17.53
Second 10.83
Third 8.21
Fourth 6.56
Fifth 5.51

Have you read the Five-speed vs. Six-speed thread? http://www.advrider.com/forums/showthread.php?t=281742
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Old 02-20-2008, 05:33 PM   #6
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Thanks a million!

As promised I will post the gradeability chart as soon as I work it up. Check back on Saturday!

Yoop
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Old 02-20-2008, 05:50 PM   #7
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Quote:
Originally Posted by kubiak
maybe you can answer a question a lot of us 650l owners have,it seems most 650ls shift smooth except for the first to second gear change.its kind of rough on all the ones i have ridden.thanks!
Problem is that is is a giant gap in ratios on 650L. Larger than any other 5 speed and probably double the 6 speeds. With no syncro and the cogs moving a vastly different RPM it is a problem. Unlike old non-syncro car/truck transmissions you can't shift to neutral and double clutch. Make sure your clutch fully disengauges.
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Old 02-21-2008, 09:41 AM   #8
XR650L_Dave
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You can always put a XR600R trans into the XRL and get rid of the big gap...

Dave
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Old 02-21-2008, 02:07 PM   #9
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As promised. My estimate of the 650's gradeability

Hope I did attached this!
Attached Images
 
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Old 02-21-2008, 02:57 PM   #10
husky123
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uhhh, yeah.....

That's awesome, now maybe some interpretation for the "slow".
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Old 02-21-2008, 03:17 PM   #11
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Quote:
Originally Posted by husky123
uhhh, yeah.....

That's awesome, now maybe some interpretation for the "slow".
For the lower 10% of the class, it shows that the valves are floating before you should shift to 2nd or shift to 2nd and slip clutch until wheel speed catches up to engine running in the power band.

Actually Honda geared 1st for very slow trails with stock gearing or just to get bike moving then short shift to 2nd. It is actually a 4 speed with granny low.
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Old 02-21-2008, 04:52 PM   #12
husky123
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Why thank you. It's pretty cool when a fancy chart backs up what you've known all along. I love my ass.
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Old 02-22-2008, 06:03 PM   #13
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The Chart

:)) you guys are a hoot! Yup the chart says what ya think. BUT it also says the aero drag limits you to 140 KPH, and the 1 to 2 upshift is such that the counter shaft speed plays a major part in the dog clutches getting engaged in that upshift, it's about at the limit of where you can go and still get a reliable shift. I haven't yet looked, but suspect that there's some machining around the dogs to allow them to locate and lock-up.

Another thing, it looks like around 130 KPH is all the L can do unless you put a some kind of aero system up front. Countdown is very astute to note that this is really a four speed with a granny.

I just looked at some KTM's for a reality check. I like their approach. Nice spread through the range.

So if this analysis is worth anything lemme ask ya...

in 5th at 120 KPH, if you encounter a slight hill are you downshifting to 4th?
is 140 KPH the top end on level grade with no head wind, best day?

Thanks,

Yoop

Yooper_Lee screwed with this post 02-22-2008 at 06:11 PM
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Old 02-22-2008, 06:11 PM   #14
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Yoop,

Stick around. I like your style. Keep the analysis coming.
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Old 03-12-2015, 06:59 PM   #15
Mechanicalnightmare
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Sorry to bring up this old thread, I hope someone will be able to answer me, I really need to know one or two things, first, is the 28.5 lb*ft of torque that the XR650L makes at 5700 rpm to the wheels or to the crankshaft? And second of all, do you know where does the primary ratio come from, i guessed the final ratio was from the sprocket to the wheels, but Im a bit lost ? Correct me if im wrong... cause the values im calculating with your ratios dont exactly match with what i should be getting
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