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1977 DT250 D flywheel/rotor/magneto ignition alternatives.

06 Jan 2018 15:10 06 Jan 2018 15:20 by prettyponiesmotorcycles. Reason: pic didn't show up first time
prettyponiesmotorcycles
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1977 DT250 D flywheel/rotor/magneto ignition alternatives. #1
Hey everyone so I'm pretty far along on this 1977 dt250-D rebuild and am having some serious trouble tracking down the stock rotor. The bike didnt come with one, but i figured i could find SOMETHING that would work. I have all the other ignition system components ready to go (mounting plate, source coil, point, condensor, however cannot find a rotor what fits :(. I was wondering if anyone out there has had this problem and solved it with any luck...
I know there's an aftermarket ignition system for this bike available, anyone tried it? Has anyone found an alternative rotor that may fit. Maybe you know a guy who can get one? From what I understand, the 1977 dt250 has points, but it the dt400 of the same year was the first to switch to CDI.

part I am looking for is 1M18131321

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06 Jan 2018 15:50
FrankC
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1977 DT250 D flywheel/rotor/magneto ignition alternatives. #2

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06 Jan 2018 16:11
prettyponiesmotorcycles
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1977 DT250 D flywheel/rotor/magneto ignition alternatives. #3
I don't have the original rotor so i can't reference it, but i do know it is Mitsubishi. :)

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06 Jan 2018 16:27
FrankC
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1977 DT250 D flywheel/rotor/magneto ignition alternatives. #4
I hope you find it. Maybe someone here has one to compare?

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06 Jan 2018 19:23
MarkT
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1977 DT250 D flywheel/rotor/magneto ignition alternatives. #5
Factory service manual has the ignition model number listed in the specifications... usually the flywheel is stamped with something very close... usually less zeros...

1977 DT250D ignition model:


P.S. The trademe link has a "FOTO --- 1971" which is the earlier 1974-75 points flywheel model.

1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250

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06 Jan 2018 20:09 06 Jan 2018 20:27 by prettyponiesmotorcycles.
prettyponiesmotorcycles
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1977 DT250 D flywheel/rotor/magneto ignition alternatives. #6
So according to the specs in the manual (DT250D, *DT400D), i'm looking for a "Mitsubishi F000T04274". You're saying that could translate to something like F0T04274 stamped on the flywheel, which is super helpful information in the search. Do you think that the stamped number corresponds to batches of this particular flywheel (like it HAS to have the exact number on it to work),or is it the first serial number of that particular rotors production, which would make them all different... I.E. if i found a "F0T0 4277" do you think it would work...?

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06 Jan 2018 20:42
MarkT
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1977 DT250 D flywheel/rotor/magneto ignition alternatives. #7
Again, my observation is that at least from the mid-70's the flywheel number is very similar to the model number in the service manual... for example my DT400D flywheel has a number something like "F3T30072".

My 1975 DT250 has a F0T001971 or something like that... I've never seen the numbers be "different" (as in higher like your example) than what's in the service manual... they are just "shorter" with some zeros missing.

This is not official Yamaha information, it's just my experience talking.... so if you found a F0T0 4277 your guess would be as good as mine as to if it would work when the manual shows a 4274. (Personally I wouldn't take the gamble)

One other factor (and an answer to your first post question) is whether your stator is original to the bike? If the wiring matches the harness, it probably is original. You could use a COMPLETE flywheel/stator matched assembly from a 1974-76 DT250 but the wiring connectors would possibly be a bit different. For that matter, a matched CDI assembly from a 1974-1979 DT360/400 would work too... not really recommended as they are expensive and sometimes not reliable (especially the 74-76 CDI)

Any matched set 250/360 enduro ignition from 1973 or earlier won't work as the flywheel OD is too big to fit inside your case.

Or the Powerdynamo works great... brand new CDI... you have to convert bike to 12 volts... not hard... and you have MUCH better lights! MDScott just did a Powerdynamo install on his DT360 and posted a slideshow video of the basics.

1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250

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