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690 Enduro R
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(DIR) Return to: Sprockets and Chains
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#Post#: 300--------------------------------------------------
Switch to 48 tooth rear sprocket
By: coarsegoldkid Date: February 14, 2014, 10:48 am
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I thought to try out a 48t rear sprocket. That's three teeth
larger than stock. In stock trim I have proper chain slack with
the shorter surface of the adjuster up against the stop. So
with the larger sprocket I suspect it won't even go on. So the
question is how much longer should I make the chain. Certainly
not more than three links. Is there a rule of thumb for such
swaps. This could all be avoided with a one tooth smaller
countershaft sprocket and be easier. However I understand that
a smaller countershaft sprocket induces increased stress on the
chain.
#Post#: 304--------------------------------------------------
Re: Switch to 48 tooth rear sprocket
By: Endo Date: February 14, 2014, 11:16 am
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Larger sprocket in back? Do you find the 690 too tall in
gearing? After changing my pipe I've been contemplating going to
a smaller rear sprocket to regain a bit more top end & freeway
speed. I thought the 6spd tranny & stock trim had plenty of
power (even a bit too much at times) for decent trail riding.
Just curious to hear your opinion & thoughts. & don't know of
any "rules of thumb" (even though I'm sure there is one) to
answer your question. I usually start over w/ a new chain &
install it w/the wheel on and eyeball where to shorten the link.
Not a big fan of adding new links to a worn chain, unless its an
emergency. But that's just me.
#Post#: 305--------------------------------------------------
Re: Switch to 48 tooth rear sprocket
By: coarsegoldkid Date: February 14, 2014, 12:41 pm
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My stock chain and sprockets have only 5000 miles. I would
expect to go three times that with proper lubrication before
changing the drive. A link or two riveted on should not present
any issues with this used chain/sprocket combo. With 10K miles
maybe I'd do a complete new driveline.
I don't really need top end speed. Lower gearing by three teeth
larger on the rear or one tooth smaller on the front will only
tach a few hundred more rpm for any given speed. The 690 has
plenty rpm to play. I'm of the opinion that the lower gearing
will lower the crawling speed for downhill terrain when off
throttle. Currently the bike doesn't go slow enough at idle for
sufficient engine braking in first gear. The thought just
occured to me that perhaps the slipper clutch has something to
do with that. Having said that I realize I could benefit from
more experience riding hills either up or down.
I await responses from all experienced dirt riders. Bye the way
I have 48 years of pavement experience and the last 35 or so on
machines with driveshafts. Dirt not so much.
#Post#: 312--------------------------------------------------
Re: Switch to 48 tooth rear sprocket
By: Endo Date: February 15, 2014, 1:28 pm
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Well I am by now means the worlds best rider (be it street or
dirt) but I find using to engine breaking going downhill
especially on anything even remotely technical to be a bit herky
jerky and more cumbersome than helpful. I prefer to descend in
neutral or occasionally pull in the clutch & rely on my brakes
to negotiate most downhills. All engine breaking or trying to go
too slow usually does is cause me to get off balance or lose too
much momentum & crash. Most fast guys I know say to look ahead
and embrace momentum to roll over or through things & when in
doubt throttle out. But thats just my two cents when dirt
riding.
#Post#: 750--------------------------------------------------
Re: Switch to 48 tooth rear sprocket
By: Tmblwd Date: April 11, 2014, 1:52 pm
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I've been reading that the 48 drops the speed in first gear at
1k rpm from 5mph to 4mph something i would be interested in
also, i feel it would help in the tight stuff. i thought i might
gain enough slack after a couple of chain adjustments?
i'm interested to hear how it works out.
#Post#: 753--------------------------------------------------
Re: Switch to 48 tooth rear sprocket
By: coarsegoldkid Date: April 11, 2014, 5:59 pm
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On my bike I would need at least two links longer I think.
Certainly the stock chain length is too short. I gave it half a
try, chain too short, I put it all back to stock to go ride. So
when I have a down time I'll look more closely into it.
#Post#: 754--------------------------------------------------
Re: Switch to 48 tooth rear sprocket
By: SDMF_Reaps Date: April 11, 2014, 6:34 pm
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I haven't looked at my bike this closely but I know that you can
flip the axle blocks. You should check it out, it may be enough
to keep your current chain.
#Post#: 885--------------------------------------------------
Re: Switch to 48 tooth rear sprocket
By: Dogfarm Date: April 21, 2014, 5:43 pm
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I was looking at my gearing on the 690. Compared to my WR250R
the 690 seems too tall. I did gear it down from stock to give it
more pep. I like to go real slow in the technical stuff.
I checked and the PO put 48 rear on the back already. Is there
any harm in going down a tooth in front? Since 3 in the back is
equal to one in the front, I don't see why coarsegold couldn't
just go down in the front 1 tooth and keep the same chain too.
#Post#: 886--------------------------------------------------
Re: Switch to 48 tooth rear sprocket
By: coarsegoldkid Date: April 21, 2014, 6:56 pm
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I could and save money in the process. The wisdom over the
years is that a smaller countershaft sprocket will hasten the
wear the chain due to the smaller radius or something like that.
Maybe it's not a big deal. Anyway I have the 48 sitting on the
shelf because the chain needs to be longer. I should have
explored this beforehand. The chain is now got 6500 miles on
it. Probably at half life. I just might bold in a smaller one
as you say.
#Post#: 892--------------------------------------------------
Re: Switch to 48 tooth rear sprocket
By: mcrider Date: April 22, 2014, 4:13 pm
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Different brands of chain have different pin diameters. If the
added link pin is to small it will cause slackie movement; to
large and it will bind. Mic both; they MUST be exact same size.
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