Gear ratio - Page 4 - Kawasaki KLR 650 Forum
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post #31 of 78 Old 02-11-2020, 04:13 PM
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I've done a couple of them and they were a bit of a problem. There's less clearance than I find comfortable. The 17 doesn't clear the guard that protects the wires very well and some dungeoneering and butchery are often required.

I'd advise going, instead, to a 15/38 combination to get the same ratio. You'd still have the option to gear down to a 14/38, which is within 5% of the stock ratio and would be a bit more-off-road friendly if you ever wanted to go in that direction.
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post #32 of 78 Old 02-11-2020, 04:25 PM
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Quote:
Originally Posted by Tom Schmitz View Post
I've done a couple of them and they were a bit of a problem. There's less clearance than I find comfortable. The 17 doesn't clear the guard that protects the wires very well and some dungeoneering and butchery are often required.

I'd advise going, instead, to a 15/38 combination to get the same ratio. You'd still have the option to gear down to a 14/38, which is within 5% of the stock ratio and would be a bit more-off-road friendly if you ever wanted to go in that direction.
I agree on the 17 pushing the comfort envelope but I'd probably go with a 16/41 which would let you go 15/41 if desired. (I'm also not a huge fan of the 14 due to quicker sprocket wear and more swingarm slider wear)


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post #33 of 78 Old 02-11-2020, 05:50 PM
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Thank you gentleman. Interesting article from Watt-man on the subject. (Is he a member of this forum by the way?)

http://www.watt-man.com/uploads/Installinga17.pdf

So perhaps I can try some those gear ratios to obtain the same desired effect without having to chew up my front sprocket cover. Not sure why I am so afraid of running such high a high RPM for extended periods of time.

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post #34 of 78 Old 02-11-2020, 07:28 PM
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Yeap, Bill is a member here. @Watt-man

https://www.klrforum.com/members/list/w1.html

Maybe you would invite him to say 'Howdy'. I wonder if he is still active on the .net site?

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post #35 of 78 Old 02-11-2020, 07:30 PM
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I have spent more time than I care to admit using https://www.gearingcommander.com/

KLR is one of the pre-canned gearsets.
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post #36 of 78 Old 02-11-2020, 07:47 PM
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...Not sure why I am so afraid of running such high a high RPM for extended periods of time.
Because you are either well-informed, have great intuition, or both.

The dumb thing is geared to run at 110mph at the 7500rpm redline. That's too high an rpm/mph.

It really doesn't have enough power to run that fast and, in fact, peak power is at about 4500rpm.

It would seem to make some sense to gear the thing so that the fastest average speed that you travel occurs just a bit below the maximum power point. That lets you accelerate from that speed and you can gear down for a significant grade and maintain speed by bringing the rpm up.

If you normally would cruise at 70mph to git somewhere, why not gear the bike so that 70mph happens at 4000rpm? A gearing of 16/42 would do that nicely. When you done did git where you was going and need to gear down, the front sprocket can be swapped to a 15 or 14 in minutes. A prevailing torque nut, a wee short wrench, and flip-flop axle washers can make that happen real easy. I have my flip-flops set up for a 16/14 swap. @DPelletier makes a good point about accelerated wear with a 14 but, in my usage, the 14 doesn't get enough miles on it to worry about it. Exaggerating a bit, I ride 300 miles to go on a 20-mile dirt road. I think Dave rides 300 feet to go on a 20-mile dirt ride...
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“On the way downtown I stopped at a bar and had a couple of double Scotches. They didn't do me any good. All they did was make me think of Silver-Wig, and I never saw her again.” -Philip Marlowe

“'Why' and 'How' are words so important they cannot be too often used.” -Napoleon Bonaparte

Sting like a butterfly.
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post #37 of 78 Old 02-12-2020, 06:11 AM
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Originally Posted by Tom Schmitz View Post

It would seem to make some sense to gear the thing so that the fastest average speed that you travel occurs just a bit below the maximum power point. That lets you accelerate from that speed and you can gear down for a significant grade and maintain speed by bringing the rpm up.
Agreed, id rather sit somewhat in the meat of her power band rather than just sitting in the danger zone after she's signed off.

2003 KLR650.... With all the bells and whistles
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post #38 of 78 Old 02-12-2020, 06:12 AM
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i run stock rear and switch btween 15 or 16. last time at deals gap and mountains i was on 15.
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post #39 of 78 Old 02-12-2020, 08:35 AM
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I put a 16 tooth front on mine. I am planning a few day road trips this spring.
I will probably switch back and fourth depending how the 16 works out.

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post #40 of 78 Old 02-12-2020, 10:43 AM
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I have the same setup.
Works great for on-road use for me. Still enough acceleration and lower RPMs on highways
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