16 T Front / 42 T Rear Sprocket Mod - Kawasaki KLR 650 Forum
1987 to 2007 Wrenching & Mods For maintaining, repair or modifications of Generation 1 KLR's. 2007 and earlier.

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post #1 of 18 Old 03-24-2007, 12:28 PM Thread Starter
 
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16 T Front / 42 T Rear Sprocket Mod

Ya'll,

I have to tell you about the gear change I have made to my '07 KLR. This morning I finally got around to installing both the 16 tooth front sprocket and 42 tooth rear sprocket and what a great difference! 95% of the riding I do is on the highway; so I was looking for find the perfect road set up. THIS IS IT! There is no appreciable loss of grunt on take off and the top end RPM's is greatly reduced. At 4000 RPM I'm running about 65 mph, at 4200 - 70 mph, 4500 - 75 mph and almost 80 mph at 5000 rpms.
SO for you fellow KLR'ers if road riding is your cup of tea. Do this Set Up! You will love it! It took me a leisurely 45 minutes to do the whole change: drink some coffee, smoke on a cigar, listen to some tunes and I'm done. I took about a 60 mile ride just to check it out and I'll NEVER go back to the stock gearing! I haven't had a chance to check the gas milege, but there is no way it could not improve it over stock.
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post #2 of 18 Old 03-26-2007, 11:57 AM
 
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The lower RPMs are nice, but you'll end up ruining your motor. Also, there are no fuel mileage gains. You end up in a lower gear all the time using more fuel to keep from lugging your engine. Now, if you set out on a straight 300 mile freeway jaunt then you might gain something.
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post #3 of 18 Old 03-26-2007, 07:36 PM
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It sounds like a good set up if you do a lot of hwy riding.

Today is the first day of the rest of your life.
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post #4 of 18 Old 03-26-2007, 10:35 PM
 
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Chain wear issue

Great job Denny, lets us know how it works out after a couple months or so.

One thing to consider, keep an eye on your sprocket and chain wear. Whenever there are even toothed sprockets in the front and rear, and an even number of links to the chain, the same chain links are continually contacting the same sprocket teeth. This can lead to uneven wear and a short chain and sprocket life. This can be avoided if you 'rotate' the chain periodically.

Let us know how it goes.
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post #5 of 18 Old 03-27-2007, 04:58 PM Thread Starter
 
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16T Front/ 42 T Rear Sprocket Mod

Ya'll,

Thanks for the insight. But, I fail to see how running my bike at 3500 rpms to 4000 rpms is going to "ruin" my motor. That is the RPM Range that I run every day - in town and out on the highway. I will keep on eye on the "Even / Even" situation as far as chain and sprocket life are concerned. If I were "lugging" the motor - yeah... but no way is the set up I'm running going to harm any component of my engine. In fact, it can't help but EXTEND the life of my motor.
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post #6 of 18 Old 03-28-2007, 11:52 AM
 
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The best thing that can be done for a KLR650 piston, wrist pin, and rod is not to overload or lug them by over gearing the motorcycle's final drive ratio.
Also, the KLR650 doens't exactly have the most efficient combustion chamber... being 1980's technology. Some modern bikes actually have two sparkplugs per cylinder and therefore are more efficient during the power stroke.
Over gearing won't usually translate into better mileage because you will either be lugging the engine, or you will be forced into lower gears more often.

Last edited by Biker Scout; 03-28-2007 at 11:57 AM.
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post #7 of 18 Old 04-19-2007, 12:14 PM
 
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where'd you get your 16T front? brand? price?
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post #8 of 18 Old 04-19-2007, 05:49 PM Thread Starter
 
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Thumbs up Front Sprocket - 16T

Go to this website: http://www.tpimotorcycleparts.com/

scroll down to the KLR-650 Parts Button - click on the sprockets button on the left and there you are!
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post #9 of 18 Old 04-23-2007, 08:21 PM
 
Join Date: Jun 2006
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Just came across this quote from a guy selling his KLR on Craigslist.

"I geared it to high and it had a mild seizure on the freeway. It still runs but has piston rattle, it will need a rebore."

Told ya, it can and will probably happen.
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post #10 of 18 Old 04-24-2007, 12:33 PM
 
Join Date: Apr 2007
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mild seaizure, isn't like "sort of pregnant"?
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