M-Unit Upgrade?

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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deyawper
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M-Unit Upgrade?

Post by deyawper » Sun Oct 08, 2017 12:24 am

After buying my second '06 Retro, I'm struggling with finding all of the shorts and am ready to rewire.

I've bought an m-Unit and will install the RFID key for shits and giggles.

I'm about to start ripping and splicing. Figured it would be worth it to see if anyone else has done and/or found pitfalls.

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BlueRockCrawler
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Re: M-Unit Upgrade?

Post by BlueRockCrawler » Sun Oct 08, 2017 9:55 am

Prepare for the "retro grouch uprising" as someone told me once when I mentioned fly by wire and ABS :lol: Looks like an interesting project for a technophile like me, but many of the people on this board seem to be dyed in the wool technophobes and fearful of progress. Ignore the haters and go for it. I would very much like to see your progress and hope you post lots of pics even though I have no experience with this. :cheers:
2020 KTM Duke 790
2018 Suzuki DR 650
previous bikes were
1993 Suzuki DR 650
2015 Ural Patrol
1996 750 Magna
2002 750 shadow A.C.E.
2004 919
1985 500 Magna

Trevorski
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Re: M-Unit Upgrade?

Post by Trevorski » Sun Oct 08, 2017 4:23 pm

Fascinating product I'd never heard of, I wish you well and look forward to learning how it goes. But my own retrogrouch streak :foilhead: means I'd never want it near my Ural...
2014 Asphalt Gray Gear Up: "Drastic Measures"
PNW Engine Guard, Biltwell "Tracker" handlebars, Depner 2-lever gated quadrant shifter... more in progress....
1976 Kawasaki KE125
2009 Royal Enfield AVL Scrambler- someone else's uncompleted project that I'll someday finish...
1995 Ural Tourist = "The Red Menace" owned 2007-April 2014.

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Burt1713
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Re: M-Unit Upgrade?

Post by Burt1713 » Sun Oct 08, 2017 5:07 pm

BlueRockCrawler wrote:Prepare for the "retro grouch uprising" as someone told me once when I mentioned fly by wire and ABS :lol: Looks like an interesting project for a technophile like me, but many of the people on this board seem to be dyed in the wool technophobes and fearful of progress. Ignore the haters and go for it. I would very much like to see your progress and hope you post lots of pics even though I have no experience with this. :cheers:
ABS, Ural had that for years, they called it drum brakes. :lol:
2017 cT "Woody Moose"
2002 Ural solo bobber/chopper (work in progress) “Symphony of Destruction”
1997 Sportster "Scarlet Speedster"
1984 Honda Interceptor "Cornfield Express" (Gone)

stagewex
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Re: M-Unit Upgrade?

Post by stagewex » Sun Oct 08, 2017 6:29 pm

I'm waiting for someone to tell me what you are taking about. I'm an analog guy.
Stagewex

Current Herd all running amok:
2019 Honda CRF450L (Elec Start)
2008 Vespa 150S (Elec & Kick Start)
2007 Ural Patrol (2WD, Elec & Kick Start)
2006 Honda "Big Ruckus" PS250 (Elec Start)
1991 Honda XR250L (Kick Start Only) *NOT running amok, out for Bottom & Top-End Rebuild.
1986 Yamaha BW200ES (Elec & Kick Start)

List what you "have", keep the others in your precious memory bank.

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BlueRockCrawler
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Re: M-Unit Upgrade?

Post by BlueRockCrawler » Sun Oct 08, 2017 7:04 pm

Burt1713 wrote:ABS, Ural had that for years, they called it drum brakes. :lol:
:lol:
:cheers:
2020 KTM Duke 790
2018 Suzuki DR 650
previous bikes were
1993 Suzuki DR 650
2015 Ural Patrol
1996 750 Magna
2002 750 shadow A.C.E.
2004 919
1985 500 Magna

Trevorski
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Re: M-Unit Upgrade?

Post by Trevorski » Sun Oct 08, 2017 8:28 pm

BlueRockCrawler wrote:
Burt1713 wrote:ABS, Ural had that for years, they called it drum brakes. :lol:
:lol:
:cheers:
On my '95 650 with front drum I used to think of the brakes as being figurative rather than literal
2014 Asphalt Gray Gear Up: "Drastic Measures"
PNW Engine Guard, Biltwell "Tracker" handlebars, Depner 2-lever gated quadrant shifter... more in progress....
1976 Kawasaki KE125
2009 Royal Enfield AVL Scrambler- someone else's uncompleted project that I'll someday finish...
1995 Ural Tourist = "The Red Menace" owned 2007-April 2014.

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Claus
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Re: M-Unit Upgrade?

Post by Claus » Mon Oct 09, 2017 6:27 am

deyawper, if you use the rfid-key, be sure to use a good aftermarket relais for it. The included relais failed in 3 of 5 customers` bikes.
In some few cases when the starter motor takes too much current when starting you will need a condenser to support the RFID key. The condenser is available at MotoGadget as well.Or you have to service your starter to work more easy.
If you keep with the installation instructions the m-unit will be a stable and comfortable unit with some funny features. I had no problems at all with all I have built in during the years.
Most important is to give the m-unit a good negative ground and if you want to install the Moto Gadget push switches be careful with them. To install the very thin lines to the switches is a bit tricky, If you do it the first time, it will take quite a while but in the end it´s worth it.
owned bikes: 93 Ural rig domestic model, 95 Suzuki DR 650 RSE, BMW R100GS, Suzuki GSX1100G rig, BMW R100R rig with Ural sidecar, Ural rig with BMW drivetrain under construction,

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BlueRockCrawler
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Re: M-Unit Upgrade?

Post by BlueRockCrawler » Mon Oct 09, 2017 8:44 am

Relais=relay Claus, your English is way better than my German. How big of a condenser is needed for a high amperage draw like a starter?
2020 KTM Duke 790
2018 Suzuki DR 650
previous bikes were
1993 Suzuki DR 650
2015 Ural Patrol
1996 750 Magna
2002 750 shadow A.C.E.
2004 919
1985 500 Magna

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Claus
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Re: M-Unit Upgrade?

Post by Claus » Tue Oct 10, 2017 5:54 am

Thanks BlueRockCrawler. I still try to improve my English...
I have no clue how big the condenser is.Always forgot to open the shrinked tube to have a look...
owned bikes: 93 Ural rig domestic model, 95 Suzuki DR 650 RSE, BMW R100GS, Suzuki GSX1100G rig, BMW R100R rig with Ural sidecar, Ural rig with BMW drivetrain under construction,

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BlueRockCrawler
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Re: M-Unit Upgrade?

Post by BlueRockCrawler » Tue Oct 10, 2017 7:55 am

Your English is probably better than many Americans that are natural speakers of the language :lol: People who have very powerful car audio systems use very large condensers to stabilize voltage drops, mainly for when the bass hits. They are relatively easy to find at your local car audio source gold plated and in fancy colors.
2020 KTM Duke 790
2018 Suzuki DR 650
previous bikes were
1993 Suzuki DR 650
2015 Ural Patrol
1996 750 Magna
2002 750 shadow A.C.E.
2004 919
1985 500 Magna

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Claus
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Re: M-Unit Upgrade?

Post by Claus » Wed Oct 11, 2017 3:51 pm

This condenser should be a small one, it´s only appr. 7/16" long and comes at € 15.-- (I reckon, one could buy it for less than $1 in a electronics supply store if he knew what is was). It´s only to buffer the brownout during the first fractions of a second, when the startermotor draws most amperage
owned bikes: 93 Ural rig domestic model, 95 Suzuki DR 650 RSE, BMW R100GS, Suzuki GSX1100G rig, BMW R100R rig with Ural sidecar, Ural rig with BMW drivetrain under construction,

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BlueRockCrawler
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Re: M-Unit Upgrade?

Post by BlueRockCrawler » Wed Oct 11, 2017 4:12 pm

Or steal one out of the neighbors air conditioner or fridge
2020 KTM Duke 790
2018 Suzuki DR 650
previous bikes were
1993 Suzuki DR 650
2015 Ural Patrol
1996 750 Magna
2002 750 shadow A.C.E.
2004 919
1985 500 Magna

Trevorski
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Re: M-Unit Upgrade?

Post by Trevorski » Wed Oct 11, 2017 4:57 pm

Claus wrote:This condenser should be a small one, it´s only appr. 7/16" long and comes at € 15.-- (I reckon, one could buy it for less than $1 in a electronics supply store if he knew what is was). It´s only to buffer the brownout during the first fractions of a second, when the startermotor draws most amperage
In order to have a small to medium condensor (capacitor) sustain a temporary voltage higher than what the overall main 12vdc supply line from the battery drops to when the starter is engaged, I'd expect that you'd need an isolator diode so that power can flow to the condensor/ M-unit from the main supply, but cannot flow back from the condensor/ M unit back to the main 12vdc supply. Under some circumstances a series resistor could also provide isolation but sizing the resistor to be effective and not introduce unacceptable losses is a lot trickier). Without isolation a small to medium condensor is going to get pulled down along with everything else (if something that can deliver the whopping surge amps of a lead acid battery can't hold up the voltage, then a capacitor, limited to storing a lot less energy, can't either, unless it's isolated). The one drawback of adding a diode isolator is that the diode will introduce its own voltage drop, usually in the order of 0.7 volts lost for a generic rectifier diode (much lower voltage on very specialized diodes, but those may or may not be easy to find at the right balance of amperage rating, cost, and easy to find source that'll sell you a unit of one). On some 12v electronic applications, going from around 12.0-12.7v (typical fully charged battery sitting still doing nothing, with the high end being a new battery fully charged and in great shape and the low end being with an aging battery) to 11.3-12.0v (after voltage drop introduced by diode) on a resting battery doesn't make a difference, on other applications, some electronics start acting weird and grumpy when asked to operate at under design nominal voltage. How crucially any of this matters may vary... EDIT - PS ... in some instances the sorta long sorta skinny wire providing power to your condenser/ accessories will have enough/ right resistance (resistance inherent in the wire) will be enough (compared to the thicker and lower resistance wiring from battery direct to starter motor) that you end up getting adequate isolation without an isolating diode- how that works is luck of the draw very dependent on your details- but can't hurt to try, and more power to you (figuratively and literally) if simple works...
2014 Asphalt Gray Gear Up: "Drastic Measures"
PNW Engine Guard, Biltwell "Tracker" handlebars, Depner 2-lever gated quadrant shifter... more in progress....
1976 Kawasaki KE125
2009 Royal Enfield AVL Scrambler- someone else's uncompleted project that I'll someday finish...
1995 Ural Tourist = "The Red Menace" owned 2007-April 2014.

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Claus
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Re: M-Unit Upgrade?

Post by Claus » Thu Oct 12, 2017 8:24 am

In fact I only needed to add the condensor on in two of all cases: One was a BMW R100S with the old Bosch Starter that draws up to 350 A instead of the max 165A it should. Second case was a HD Sportster with an old battery the customer didn´t want to be replaced and a lightly advanced ignition.
In all other cases I would try it without the condenser, as long the battery and the starter are ok.
owned bikes: 93 Ural rig domestic model, 95 Suzuki DR 650 RSE, BMW R100GS, Suzuki GSX1100G rig, BMW R100R rig with Ural sidecar, Ural rig with BMW drivetrain under construction,

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