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 Post subject: Re: Gearing question
PostPosted: Sat Feb 04, 2012 4:20 pm 
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Trail Rider
Trail Rider

Joined: Sun Oct 09, 2011 2:03 pm
Posts: 97
Location: Spacecoaster FL, USA
Kernel wrote:
it just seems like there's not a great deal of rev drop when shifting gears, I'd like more.


Wow. That's the first time I've heard that about a DR. If you were closer, I'd let you take my YX600 for a ride...close-ratio 6spd. I can almost hit 6th getting across a large intersection, and 1st is too tall to idle through a parking lot without slipping the clutch a bit. The DR has a much bigger difference in revs between gears. It's a whole lotta shifting riding the YX around town.

Quote:
Yeah, my flatslide carb pulls smoothly a few hundred revs earlier than even the jetted and slide drilled stock carb, and there's much less surging at low speed. Gotta thank mxrob for setting the carb up for me :)


This might be a large part of why shifting seems to not change much how your engine pulls. Throw your stock carb back on for a weekend and see if the gears don't seem really spaced out again. :s_smile

I'd also try other sprocket combos to see what works best for your riding. I ran 85MPH (indicated) for almost 1200 miles on a trip from Tyler Texas to Melbourne Florida, running the stock 15/42 ratio. The DR didn't seem over-revved at all, and it had run around in the wet dirt, clay, grass, and sand all week on my mom's farm just fine too. I recently swapped to 16/46, to minimize chain wear while running a 520 setup. I also wanted to keep the highway ability similar to stock, but experiment with a slightly lower 1st and 2nd gear offroad. I swapped to the 46t rear, while still running the 15t CS, and took a little ride to test it out. Revs were considerably too high for me at 70MPH+ (indicated), while this 15/46 combo is only about 1 rear tooth shorter than the popular 14/42 (equivalent to about 15/45) combo. The 16/46 still seems comfortable at well over 75MPH (indicated), yet pulls just slightly better from a stop with a passenger than the stock gearing. I'd like to try 16/47 as well, seeing as it would be just slightly taller than the popular 14/42, but even better for offroad than my current 16/46.

My approach...Try to gear just tall enough for comfortable highway revs with my usage (your common speeds may vary). Then let a well-sorted carb and a fit clutch hand deal with the bottom end offroad. Appropriate tires help too. I'm switching to DOT knobs for more offroad, since I have a pavement bike too.

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 Post subject: Re: Gearing question
PostPosted: Sun Feb 05, 2012 5:40 pm 
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Newbie
Newbie

Joined: Mon Jan 23, 2012 10:01 pm
Posts: 5
14/42 but I'm an easy off road rider...


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 Post subject: Re: Gearing question
PostPosted: Sun Feb 05, 2012 8:58 pm 
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MSF Student
MSF Student

Joined: Thu Oct 27, 2011 8:31 pm
Posts: 34
Location: Blythe CA
My commute includes 20 miles of 70 mph freeway, so I went
with a 16 tooth countershaft sprocket with the stock rear 42 tooth sprocket.
It cruises nice and vibe free at freeway speeds now, and it still
has plenty of torque to cruise around town in start and stop traffic.
BTW, I don't take it off road very often, but when I do, it seems to do just fine.


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 Post subject: Re: Gearing question
PostPosted: Sun Feb 05, 2012 9:23 pm 
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SuperMoto Dude
SuperMoto Dude

Joined: Sat Mar 12, 2011 11:08 pm
Posts: 349
robndeb wrote:
My commute includes 20 miles of 70 mph freeway, so I went
with a 16 tooth countershaft sprocket with the stock rear 42 tooth sprocket.
It cruises nice and vibe free at freeway speeds now, and it still
has plenty of torque to cruise around town in start and stop traffic.
BTW, I don't take it off road very often, but when I do, it seems to do just fine.


That is what I wanted to hear as I would also like to go to a 16T CS sprocket as I only ride freeway and did not like the high RPMs at speed.

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 Post subject: Re: Gearing question
PostPosted: Mon Feb 06, 2012 12:49 pm 
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Adventure Rider
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Joined: Sun Mar 13, 2011 7:19 pm
Posts: 690
Location: Stuart, FL.
I have 16/42 and at 80mph the rpms are at 4900. Passing sucks though.

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 Post subject: Re: Gearing question
PostPosted: Mon Feb 06, 2012 1:22 pm 
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SuperMoto Dude
SuperMoto Dude

Joined: Sat Mar 12, 2011 11:08 pm
Posts: 349
seacraft69 wrote:
I have 16/42 and at 80mph the rpms are at 4900. Passing sucks though.


Thanks seacraft69, I would not want to go faster than 80 MPH anyhow. I think I have a better power to weight ratio so my passing should be a bit more lively than yours. :clapping: :drinks: :whistling:

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 Post subject: Re: Gearing question
PostPosted: Mon Feb 06, 2012 6:57 pm 
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Adventure Rider
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Joined: Sun Mar 13, 2011 7:19 pm
Posts: 690
Location: Stuart, FL.
that's right you have the 780 kit don't you? im in the process of building a motor now. i just went with the h/c piston and cam though. but since my bike was uncorked before the tranny went, this should be a big improvement. :s_thumbsup

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 Post subject: Re: Gearing question
PostPosted: Mon Feb 06, 2012 9:06 pm 
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SuperMoto Dude
SuperMoto Dude

Joined: Sat Mar 12, 2011 11:08 pm
Posts: 349
seacraft69 wrote:
that's right you have the 780 kit don't you? im in the process of building a motor now. i just went with the h/c piston and cam though. but since my bike was uncorked before the tranny went, this should be a big improvement. :s_thumbsup


Yes I do have the 780 kit and I weigh less than 140lbs..!!

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 Post subject: Re: Gearing question
PostPosted: Mon Feb 06, 2012 9:27 pm 
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Adventure Rider
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Joined: Mon Mar 14, 2011 7:09 am
Posts: 1683
Location: Melbourne, Australia
Kommando wrote:
Kernel wrote:
it just seems like there's not a great deal of rev drop when shifting gears, I'd like more.


Wow. That's the first time I've heard that about a DR. If you were closer, I'd let you take my YX600 for a ride...close-ratio 6spd. I can almost hit 6th getting across a large intersection, and 1st is too tall to idle through a parking lot without slipping the clutch a bit. The DR has a much bigger difference in revs between gears. It's a whole lotta shifting riding the YX around town.

Quote:
Yeah, my flatslide carb pulls smoothly a few hundred revs earlier than even the jetted and slide drilled stock carb, and there's much less surging at low speed. Gotta thank mxrob for setting the carb up for me :)


This might be a large part of why shifting seems to not change much how your engine pulls. Throw your stock carb back on for a weekend and see if the gears don't seem really spaced out again. :s_smile

I'd also try other sprocket combos to see what works best for your riding. I ran 85MPH (indicated) for almost 1200 miles on a trip from Tyler Texas to Melbourne Florida, running the stock 15/42 ratio. The DR didn't seem over-revved at all, and it had run around in the wet dirt, clay, grass, and sand all week on my mom's farm just fine too. I recently swapped to 16/46, to minimize chain wear while running a 520 setup. I also wanted to keep the highway ability similar to stock, but experiment with a slightly lower 1st and 2nd gear offroad. I swapped to the 46t rear, while still running the 15t CS, and took a little ride to test it out. Revs were considerably too high for me at 70MPH+ (indicated), while this 15/46 combo is only about 1 rear tooth shorter than the popular 14/42 (equivalent to about 15/45) combo. The 16/46 still seems comfortable at well over 75MPH (indicated), yet pulls just slightly better from a stop with a passenger than the stock gearing. I'd like to try 16/47 as well, seeing as it would be just slightly taller than the popular 14/42, but even better for offroad than my current 16/46.

My approach...Try to gear just tall enough for comfortable highway revs with my usage (your common speeds may vary). Then let a well-sorted carb and a fit clutch hand deal with the bottom end offroad. Appropriate tires help too. I'm switching to DOT knobs for more offroad, since I have a pavement bike too.

Some good advice there, thanks! :good:
I also find that 1st gear is a too high for idling around a car park without a lot of clutch shifting on the DR. I might try a 14t counter sprocket with the stock rear sprocket.
I would play around with different front sprocket & rear sprocket combinations but my budget doesn't really allow for that. I might try digging up that thread over on ADVRider where this guy has figured out some good front/rear sprocket combinations for offroad/highway riding/street rding and can change out the front sprocket in 10 minutes.

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 Post subject: Re: Gearing question
PostPosted: Wed Feb 08, 2012 1:35 am 
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Trail Rider
Trail Rider

Joined: Sun Oct 09, 2011 2:03 pm
Posts: 97
Location: Spacecoaster FL, USA
Kernel wrote:
Some good advice there, thanks! :good:
I also find that 1st gear is a too high for idling around a car park without a lot of clutch shifting on the DR. I might try a 14t counter sprocket with the stock rear sprocket.
I would play around with different front sprocket & rear sprocket combinations but my budget doesn't really allow for that. I might try digging up that thread over on ADVRider where this guy has figured out some good front/rear sprocket combinations for offroad/highway riding/street rding and can change out the front sprocket in 10 minutes.


I'm liking the 16/46 so far. It's roughly the same as 15/43. If you run a lot of high-speed pavement, but still want smooth starts or bumbling along in parking lots, this ratio works well. It doesn't really cut into your top end before Johnny Law would. Our fastest speed limits are 85MPH (137KPH) in some western states, and the DR will still run there (GPS) with this gearing. 14/42 (Is 42t stock rear in Oz?) would be better if you don't do high-speed (110KPH+) riding.

Something else just occurred to me...You could run tall stock 15/42 gears with an auto-clutch. Then you'd have lazy high-speed RPMs, and no stalling/lugging issues at low speeds.

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Dualsport rider, former jarhead, Dos Equis test-drinker, Hawaiian Tropic Bikini Team Oilboy...It's a rough life, but somebody's gotta do it.


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