PumpkinRecine

1985 DR 250 12 volt conversion ( help! )

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I just acquired a 1985 DR250 for $180 bucks. She needs a lot of work, but has great compression. The pickup coil shows 70 ohm which is well in range. I have no spark because of a dead CDI (pickup / stator / ignit coil all test ok). 

 

These old bikes have rare CDI units that are $150+ and also have a shitty 6 volt system. I found through some googling that the DR250 and GN250 of the same era share the same engine. The only difference is the GN250 has a 12 volt system. SO... here is my idea...

 

I can get a stator / voltage regulator / cdi for a 1985 GN250 and plop it into my 1985 DR250. This way I have a 12 volt system, a cheaper CDI, and a fully rebuilt ignition system. 

 

Please chime in and tell me to go for it or im an idiot. thanks!

 

https://www.instagram.com/p/BHPyIWIAe9L/?taken-by=theoriginalpumpkin

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welp.. if you are going to do anything do it yourself I suppose. The GN250 stator will fit perfectly in the DR250 engine. Parts for the GN250 are fairly cheap too.

 

Parts needed...

1. Voltage Regulator (~$24) - http://www.ebay.com/itm/271531329667?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

2. CDI (~$20)- https://www.amazon.com/gp/product/B012ZUXSAG/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

3. Stator with Pickup Coil (~$30) - http://www.ebay.com/itm/171565178165?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

4. GN250 wiring harness (Used so price will vary) - http://www.ebay.com/itm/131861866599?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

 

The grand total spent on this bike so far is...

1. $180 cash for the DR250 on craigslist

2. ~$130 on the parts listed above

 

Everything else on the bike is total shit. The handles, brake master cyl, tires, chain etc will all have to be replaced but this should all come out to about another $300-$500. 

My estimate is at the end of the day I will be at about  a grand with registration, the ignition system, wheel bearings, controls, seat cover and accessories like turn signals and brake lights etc. The nice part about doing all this is knowing that the entire bike will be practically brand new by the time I am done with it, excluding the engine and suspension systems. 

 

 

 

20160710_124029.jpg

20160710_124018.jpg

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and it works! I ended up reverse engineering the wiring harness along side a wiring diagram so I could hook it up for always on operation without any kill / ignition switch required. The circuit is really simple. the bottom 2 pins of the CDI are the pickup coil. the middle left is + the middle right does nothing. The top left is to fire the ignition coil / spark plug. the top right is ground. 

 

To fire it I attached a 12 volt lithium ion battery to the cdi, plugged in the pickup coil, wired up the ignition coil and ran her with carb cleaner as the mikuni is a pile of dirt / rust and varnish paste. Here is a link to the instagram video. 

 

https://www.instagram.com/p/BIPEPuCgEER/?taken-by=theoriginalpumpkin

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The links to the instagram photos are broken.  Im doing the same project right now.  Please help.

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My Instagram is now instagram.com/aaronrecine. DM me and I'll try to remember it and walk you through it. Best option is to get a gn250 and dr250 manual and back engineer the diagrams. I never got it fully working, but I'm sure now with the extra experience I have I can help you out. 

 

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Hey guys .. old thread .. but here is some info ... The European DR250S 1982-89 was a 12V system with a battery ... Also the SP250, which is basically the same bike with a few minor Mods, was a 12V system. So swap the loom, stator and add the Reg/Rec and a battery eliminator and bob's your uncle. The CDI and coil are the same parts across the 6V and 12V models.

I have loads of Euro DR250S parts .. but am UK based so not much help to you guys in the States .. but EBay usually has relevant bits.

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Bobgarty, I might need to tap into your knowledge soon mate. I'm UK based too (suffolk) and in contemplating whether a 12v conversion will make my 1992 (ish) jap import djebel (probably) easier to start. Ive got a gn250 engine in the shed...

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Posted (edited)

5b36453dda37a_311020154111.jpg.bdc376b98c6b73e2eafe97f03c1fc2e5.jpgHi Jon,

The Post 1989 DR250 is a very different beast and I'm not that familiar with it (to compare see my '82 DR250S above) .. upload a pic so I can try to work out what model it is ..

Edited by bobgarty

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It's not that easy mate lol. It's a 250 with a 350 front and rear end. The engine number points to a 1992 jap import djebel but the ecu and reg/rec do not match any models I can find anywhere online. 

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