stellar Posted July 13, 2011 Share Posted July 13, 2011 Hi everyone! I'm new on this forum, but I am part of a few others so I know my way around a little. Anyway I got a 1974 MX250 a while back and it wasn't running when I got it. I have it stripped down, frame and engine re-painted and put pack together but now I'm trying to get it to run. The problem I'm having is I have the inner rotor type ignition system, which requires an 8 wire CDI, but the CDI on the bike is for the outer rotor system which only has 7 wires. I've read time and time again that you can make them work just by grounding the extra lead off the ignition, but the wiring has been messed with so much that I can't tell what's supposed to go where. Has anybody done this? Once I get some spark out of this thing I'll be set. The carb has been re-built so I should be able to just fuel and go! Link to comment Share on other sites More sharing options...
Moderator Cynic Posted July 13, 2011 Moderator Share Posted July 13, 2011 Hi everyone! I'm new on this forum, but I am part of a few others so I know my way around a little. Anyway I got a 1974 MX250 a while back and it wasn't running when I got it. I have it stripped down, frame and engine re-painted and put pack together but now I'm trying to get it to run. The problem I'm having is I have the inner rotor type ignition system, which requires an 8 wire CDI, but the CDI on the bike is for the outer rotor system which only has 7 wires. I've read time and time again that you can make them work just by grounding the extra lead off the ignition, but the wiring has been messed with so much that I can't tell what's supposed to go where. Has anybody done this? Once I get some spark out of this thing I'll be set. The carb has been re-built so I should be able to just fuel and go! OOOh, welcome to the forum, could be a bit till a response comes up, maybe a day or 2. There are a couple of lads on here that should be able to set you right though. 75cc too much for my knowledge. Sorry. Link to comment Share on other sites More sharing options...
stellar Posted July 16, 2011 Author Share Posted July 16, 2011 Thanks! I have found some guys with the correct CDI on ebay and stuff, and the one I have is in great shape so I might see if they're willing to trade. The coil on the bike is also wrong which might be part of the issue. I might do a new coil, wires, caps and plugs then try playing around with the wiring a bit more. It's cheaper than buying a new CDI. I think I'll fix up the plastics on the bike the best I can but then get a new set (from DC plastics?) for more show. The bike will look great, and it is a 74 twin shock so it qualifies for vintage racing! Link to comment Share on other sites More sharing options...
blackhat250 Posted July 18, 2011 Share Posted July 18, 2011 Where you based Stellar " Speedshop [ on here,& ebay] is a Wizard in CDI. ask him politely ,, Oh " i see you have a Z400 , They were slower than a Glacier Link to comment Share on other sites More sharing options...
stellar Posted July 20, 2011 Author Share Posted July 20, 2011 Where you based Stellar " Speedshop [ on here,& ebay] is a Wizard in CDI. ask him politely ,, Oh " i see you have a Z400 , They were slower than a Glacier Speedshop eh? I'll have to keep that in mind. I'm located in Guelph Ontario, about 40 minutes from Toronto. The KZ400 didn't run when I got it but it had decent compression, still haven't done much riding with it, but it's just an in-town/go out for coffee kind of bike. I doubt it'll do the ton, but that wont stop me from trying it sometime! Link to comment Share on other sites More sharing options...
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