andy175

Right then, the donor bike i used was a Honda c90. Although the c70 or c50 will do as long as its the later non points model. They all use the same electrics according to part numbers ive seen. Here is the remains of my original dt175mx stator plate in situ: And here is the c90 stator before i fixed it in place: And here is the two magneto's,the one on the left being the c90 part. Now purely because the woodruf key was about 1mm different between the two,i drilled out the rivets of the centre sleeve's to swap them over. Now i had to turn down one of the sleeves slightly to fit inside the other magneto,then i had to reset the timing before drilling new holes to bolt back together the sleeve to magneto. I used nut and bolts as i didnt have any blind rivets left, to give it the factory type look For some reason my camera phone pics of the finished article didnt come out,so i will take some more if the rain ever stops down here on the south coast Will add some more with new photo's soon.

If you go to bikepics.com they have the model year photo's of most bikes ever made.

Ive used a old fashion metal sliding vernier before. Take your plug out and rest the opposite end of vernier to which you normally measure from,down towards your piston. Then slowly turn crank to t.d.c and take the reading,and make your mark on magneto to case. Then turn crank again but allow for your 1.8mm (or whatever your dt model allowance is) b.t.d.c. and make your mark again on magneto to case. Crude yes,but does work

Well Paul,all the electrics are now from the 12volt donor bike From the stator plate,coils,pulser coil,magneto,cdi,ign coil,reg,relays and of course the whole wiring loom Once i got it into my head that i could modify a 12 volt system to fit,i was just determined to make it work ! I can post some pics of the magneto/stator conversion if interested ?

Well today i got the DT up and running properly. The bike now runs a full 12 volt system, that is lights,ignition and indicators e.t.c. The bike now owes me about 120 quid,so if i can find some road legal parts cheap enough then i will get it back on the road. I'm after a headlight with brackets,speedo/rev counter with bracket and a rear mudguard. Oh, and a later type kickstart lever,as mine has the twin shock style one at the moment Back to watching ebay for bits now !!

Well i had a change in direction to over come the pulser coil problem. I have changed the whole ignition system and wiring loom to that of another bike that runs a 12 volt system I have only just fitted the loom today,and got a spark from the plug resting on the head so all looking good so far Have had to do some major work to adapt the stator and magneto to fit some of the yamaha parts,but all done at home with some alternative tooling Still have to set the final timing exactly,but hoping to have it running very soon.

Thanks Cynic,yes it has all the features you stated

Hi Paul,This is the responce i got back today regarding the pulser coil : ..................................... Hi Andy Sorry, I can’t give you a definite reply about this because we don’t have a listing for the DT175/P30. Generally speaking if it looks identical it should be the correct part. Regards Lesley Houghton Electrex World Limited Tel: **44 (0)1491 682369 Fax: **44(0)1491 682286 www.electrexworld.co.uk ............................................ Now i'm in agreement with them over this,as its dimensions are the same and its just a switch over trigger at the end of the day !! If we ever get a dry day again,then i will go outside and check the earth and a few other things And if that doesn't work i may well order a new one from them

Sorry to hijack your thread garat78, but could you check any info you can find on my DT175MX Bill? My engine and chassis number are: 2k4-024009. Many thanks, Andy..

Yes i know what you mean. I did try that earlier today,to see if it made a difference,sadly not ! I also wondered if the air gap was adjustable like the crank position sensor on a modern car,but no to that also. Just my luck that the most expensive coil has gone on Its a shame there is not the yamaha equivalant to David Silver available !! Here's someone i will call :My link

Ah,well ive screwed it on the right way then As ive attached it the same way as the other two coils,i can only assume that the pulse coil has had it then Good job this is a long term project

Well i have had the coil off as it came in a plastic bag along with the source and lighting coil. Yes there is just the one red/white wire on it,and its screwed onto what looks like a alloy backing plate.So i can't see how it would earth through that? Also how would i go about testing it off the bike,as i can take it back out in just a couple minutes now Without a workshop manual for this model,i'm putting it back together from memory of many years ago ! Andy..

Oh !! I thought the part i needed was:3m285580-20 Your saying the part i need should be:2a785580-20 ? Also am i right in thinking that the pulser coil is energised by the magnets passing over it as the magneto turns ? Another also,are the slight changes in part numbers stand for differing values in ohms being given off by the coil? Cheers again,Andy..

Hi Paul,yes been lurking around in here I hadn't thought about getting it recoiled,its so small it may come under micro surgery !! Here's another i saw to but not quiete the same part number My link Ive seen new one's up for 150 euros,thats unreal As you say i will keep an eye on ebay for now, and if no joy in a few weeks i may have to go down the recoil route, if i can find someone brave enough to tackle it !! Yes i will give fowlers a call as ive had parts off them before and found them pretty helpfull in the past. Andy..

Hello all,my names Andy and just joined the forum. Ive just acquired a DT175mx in need of much t.l.c. Its got matching engine and chassis numbers but no v.5/log book. Before i got it someone decided to take all the electrics off it,leaving a very tatty wiring loom in a bag which i'm sorting out Anyway,could anyone help me acquire a replacement magneto pulse sensor coil ? Ive been going through the coils with a multi meter,and it seems the pulse coil has died as there are no ohms being recorded from it !! I'm still waiting for a haines manual to be delivered, but ive found on the internet that it should be between 10-12 ohms. But mines got nothing Ive looked up the part number on cmsnl and they show it as :3m285580-20. Any help appreciated folks.