Custom Transmission Gearing

The "Pimp my Ride" section for Soviet bloc bikes. Everybody seems to have their own custom add-ons, modifications & accessories. Share your tips and post pictures of them here.
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This is the place for topics concerining modifying and accessorizing your Ural or Denpr.
wyowillys46
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Custom Transmission Gearing

Post by wyowillys46 » Fri Jan 12, 2018 1:11 pm

All,

I've been talking with a gentleman in Russia by the name of Vladimir Turaev regarding custom transmission gearing including a fifth gear option. As I understand, he sells kits for four speed gearboxes in different ratios for the Ural and the Dnepr, and also sells a fifth gear kit only for the Dnepr box. He also sells complete gearboxes, although shipping a kit would no doubt be worlds cheaper than shipping a whole box. I'm planning on ordering a fifth gear kit for the MT804 transmission on my M72 solo later this spring. If I can get a few more people to join in, he's willing to offer a 10% discount. The price I've been quoted is $461 for a 1:1 fifth gear kit.

As an example the fifth gear kit I'd be buying includes:

Primary (input) shaft with low first gear 37/9
Secondary (counter) shaft with drive coupling
5th gear, 23 teeth
5th gear bushing
5th gear fork
5th gear switch-on clutch (the synchro hub)
Dog
Switching disc (the shifter quadrant disc)

Remember that with a fifth gear you will lose reverse. Those in mountainous areas and at high elevation should consider this carefully. But other sets of ratios are available for the other 4 speed boxes. Vlad reports that he is running his five speed kit on a 650 bored out to 772cc and 35/9 (3.89 final drive) an put 11000KMs on it for a month and a half with no problems. I've told him about SS and I will also be posting this over on the Russian Iron forums. He may post up later. I've a PDF that he put together detailing the different gears. I'll see if I can get it attached today. I think he also sells a higher capacity pump.
Last edited by wyowillys46 on Sat Jan 13, 2018 11:05 pm, edited 5 times in total.
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Re: Custom Transmission Gearing

Post by Mikey » Fri Jan 12, 2018 1:17 pm

This would be perfect for a solo for sure!
Posted via tablet or phone so please ignore any odd words (autocorrect).
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Re: RE: Re: Custom Transmission Gearing

Post by ChiefPockets » Fri Jan 12, 2018 1:45 pm

Mikey wrote:This would be perfect for a solo for sure!
And the option of a lower first would be amazing off road!

wyowillys46, please post more info when you can!
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Re: Custom Transmission Gearing

Post by rivers » Fri Jan 12, 2018 1:57 pm

I have no need for a higher 5th/OD gear but would be interested in a lower 1st and 2nd gear set.
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Re: Custom Transmission Gearing

Post by siberman1 » Fri Jan 12, 2018 2:03 pm

rivers wrote:I have no need for a higher 5th/OD gear but would be interested in a lower 1st and 2nd gear set.
My thoughts exactly. I don't need "faster", "slower" would be fine.

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Re: Custom Transmission Gearing

Post by dneprlover » Fri Jan 12, 2018 2:10 pm

The low 1st gear of 37/9 is a standard gearing for Dneprs but is only fitted to MT16 models from the factory.

Several sellers have been offering this service for quite a while now ( eg. Dneprural_1 on Ebay who offers complete boxes for $395 +$105 shipping)

I believe Chris Tooms also offers the service with a choice of gearing , but on an exchange basis, which works out a little expensive.

All these gear sets are based on the boxes used by the factory 750cc motocross competition motocross outfits from the late 1970's to the mid 1990's

I have never seen ( nor heard of) 5 speed boxes for any Ural model. ALL are of the Dnepr MT804 type
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Re: Custom Transmission Gearing

Post by Michal » Fri Jan 12, 2018 2:19 pm

I guess that the 5th speed is for Dnepr MT804 gearbox only. The Dnepr gearbox is approx 15mm (9/16") longer than Ural gearbox because Dnepr reverse is basically an independent 5th gear set while Ural reverse is sort of shiftable spur gear that uses 1st and 2nd speed gears for function.
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Re: Custom Transmission Gearing

Post by Michal » Fri Jan 12, 2018 2:28 pm

dneprlover wrote:The low 1st gear of 37/9 is a standard gearing for Dneprs but is only fitted to MT16 models from the factory.
Do you know anything about 8 teeth 1st gear shaft for Dnepr 804 gearbox? One local Dnepr guru owns one bud he couldn't get any other piece in last 30 years.
I consider fitting Dnepr 804 gearbox in my Ural because Dnepr gb works way better than Ural crap. Unfortunately Dnepr metallurgy is awful, that's the only downside. I wonder why Ural didn't choose Dnepr gb over old Ural crappy design for replication by Herzog.
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Re: Custom Transmission Gearing

Post by Igor26rus » Fri Jan 12, 2018 2:30 pm

5 transfer is on the Dnieper, in the Urals only since 1992 they already have boxes interchangeable.

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Re: Custom Transmission Gearing

Post by Igor26rus » Fri Jan 12, 2018 2:46 pm

Sorry, I'm confused. On the urals do not put 5 gear, only 4 raised. You can put the gearbox on the Dnieper.

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Re: Custom Transmission Gearing

Post by wyowillys46 » Fri Jan 12, 2018 3:22 pm

You’re right about the fifth only fitting the Dnepr box. I’ve changed the original post to reflect that.
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Re: Custom Transmission Gearing

Post by roscoau » Sat Jan 13, 2018 3:28 am

rivers wrote:I have no need for a higher 5th/OD gear but would be interested in a lower 1st and 2nd gear set.
+1

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Re: Custom Transmission Gearing

Post by Tural » Sat Jan 13, 2018 4:01 am

Hi all! My name is Vladimir Turaev, shortly Vlad :) I am considering the possibility of a return to the production of modified transmissions for Soviet heavy motorcycles and if you are really interested in the low variant of the Dnepr box and the five-stage Ural, I am ready to discuss the details of developing both, perhaps even more options. I made a single set of parts for the low Ural boxes 8 and 12 teeth on the 1st and 2nd gears and I remember that this kit was ordered by an Australian cruise ship in the late 90's, but I do not know its fate.
8 teeth already have a strength problem, but it can still be overcome to make a smaller number of teeth already pointless. How much lower do you want the second transfer? The other two transmissions must also be changed? In which direction do you want to go? This must be discussed.
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Re: Custom Transmission Gearing

Post by stagewex » Sat Jan 13, 2018 1:12 pm

Looking to go faster with additional gearing by losing "reverse", you should look at getting another bike.
"Reverse" is one of the most helpful options whether you own a 2WD or 1WD. Whether the rest of the rig is up to a gearing change like that is another question.

Want to still go in the woods those KLR's with the sidecar chariots are very cool. No reverse.
Or something like this (below). But it's a whole different riding experience than most folks do here with their Ural.

https://www.ebay.com/itm/1990-Honda-CBR ... x2&vxp=mtr
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Re: Custom Transmission Gearing

Post by Eric N » Sat Jan 13, 2018 2:35 pm

stagewex wrote:Looking to go faster with additional gearing by losing "reverse", you should look at getting another bike.
"Reverse" is one of the most helpful options whether you own a 2WD or 1WD. Whether the rest of the rig is up to a gearing change like that is another question.

Want to still go in the woods those KLR's with the sidecar chariots are very cool. No reverse.
Or something like this (below). But it's a whole different riding experience than most folks do here with their Ural.

https://www.ebay.com/itm/1990-Honda-CBR ... x2&vxp=mtr

Just trying to make sure I understand you. On my Solo, you believe reverse is still super important? Really?
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