DT125R ARCHIVE

gooner78 · Guru

no spark

gooner78 · Guru

Can anyone help as i,m well and truely stuck on this one i tried another coil but its still not sparking i tried a new ht cap and i disconnected the kill switch but no luck

fused420 · DTR Senior Member

Is there power going to the coil? Power coming from stator? Faulty side stand switch maybe?

gooner78 · Guru

I have good power from the stator the coil is brand new as is the ht cap and spark plug when i turn the ignition on i get the power valve cleaning cycle and oil light and neutral light do you think the cdi could be knakered.

superted · DTR Respected Member

loose terminals on the coil

gooner78 · Guru

All wires have been checked there all tight none are broken i,m stumped

Calum122 · Guru

Fault to earth. If any live is touching the frame it'll trip the fuses. Check the fuse box. Check that all wires are insulated.

Check neutral switch is engaged and working. Check side stand switch.

If you're really stumped then you're going to have to do the worst. Wire in main components only. Bypass the ignition switch. Just hve cdi lights and genrator. It's what my brother had to do cause there was a faulty component in the electrics. He only used the bike once a month so didn't really care.

gooner78 · Guru

everything is fine like fuses theres no broken wires or loose terminals it has a brand new battery i have power from the battery power from the stator i have a new coil a new ht cap a new spark plug i have been over just about everything am i right in thinking the flywheely pick up sends a signal to the cdi then from the cdi to the coil which causes a spark i might get another cdi of ebay and try that but if it still won,t spark what the hell could be wrong with it

Calum122 · Guru

Electrics ain't my forte :\

superted · DTR Respected Member

only one other thing i could think of and that was on my tzr it got a fault on the servo (got damp in it) and what ever i did no spark so i ended up disconecting every thing like cut off witch side stand switch ect, turneded out when i disconnected the white and red wire i think it was on ther servo it ran again

Calum122 · Guru

Could try that. That's a two second job.

Also how about this. Like I said I don't know enough to give good ideas. But someone back me up.

I hear it's common that once rebuilt, the woodruff key is prone to fall out again. Now I don't know but doesn't that have something to do with regularity of spark or give any spark. So check the fly wheel to see if the woodruff key has fallen out.

Like I said someone will have to +1 that cause I'm clueless when it comes to this part of the bike

gooner78 · Guru

Calum122 wrote:

Could try that. That's a two second job.

Also how about this. Like I said I don't know enough to give good ideas. But someone back me up.

I hear it's common that once rebuilt, the woodruff key is prone to fall out again. Now I don't know but doesn't that have something to do with regularity of spark or give any spark. So check the fly wheel to see if the woodruff key has fallen out.

Like I said someone will have to +1 that cause I'm clueless when it comes to this part of the bike

Is that the the peice that keeps the flywheel on the shaft.

Calum122 · Guru

Yes

Calum122 · Guru

I've heard that once removed they can be a real bítch. Happened after my brother rebuilt his DT. Just kept falling out.

Calum122 · Guru

Am I on the right lines with this one? Could this be a factor?

gooner78 · Guru

I was getting a perfect reading of the stator when i had my multi meter on it though i will check tomorrow though thanks

Calum122 · Guru

Very true. So you're saying 'Ya don't know' Ok understood

Calum122 · Guru

Yeah. That's the problem with electrical faults on bikes/cars.

NORFE · DTR Trusted Engine Builder

Calum122 wrote:
Could try that. That's a two second job.

Also how about this. Like I said I don't know enough to give good ideas. But someone back me up.

I hear it's common that once rebuilt, the woodruff key is prone to fall out again. Now I don't know but doesn't that have something to do with regularity of spark or give any spark. So check the fly wheel to see if the woodruff key has fallen out.

Like I said someone will have to +1 that cause I'm clueless when it comes to this part of the bike

it cant fall out if its done proply biggrin

once u have the magnito sat on the key way give it a good few cracks with a mallet b4 tightening it

superted · DTR Respected Member

also just a thought may have been said before but check ur cut off switch is on run as i had an hour mess around with me dads bike yestoday and it was cut off switch was on off lol

gooner78 · Guru

****ng hell i just fitted a new cdi and it still aint sparking

Calum122 · Guru

what a ball ache

gooner78 · Guru

Is there an earth wire from the stator to the engine case that could possibly of come loose or could it be the pick up thats shot.

NORFE · DTR Trusted Engine Builder

could be

with electrick it could be all sorts , normally a broken loose wire,

disconnect the kill switch and side stand switch 1st off

then check if theres power cummin out of the stator and the pickup with multi meter, test all along the line til u find where power is going to and stopping, its all in the manual with how too guides and specs !

i fking hate lekky dialemas ha

gooner78 · Guru

Still no luck with it i,m going to have to stick in the shop i can,t believe it ive just spent the best part of £400 on a engine rebuild and now have to spend even more trying to get this problem fixed the local bike shop charges £25 an hour as well.

Calum122 · Guru

That's kat.

It's got to be something so obvious that you're missing. A fresh pair of eyes will sort it out no problems i reckon. should be on the road in no time.

stroker · DTR Senior Member

Deal with this all the time at work

Could be

wiring from cdi to ignition / kill switch / side stand ect

Coil, either replace or test the resistance

cdi unit only way is to replace once your sure its nothin else

stator check for resistance

pick up check for resistance

I have known for the magnatisam to break down on the magneto this is extreamly rare

Electrics are very frustrating but rewarding once you have pinpointed the problem

you can send the stator / picup off to west country windings for testing and werindings

with no spark problems always start from wiring to spark plug then down to the stator if all this fails to be the problem then its more than likely your cdi.

gooner78 · Guru

stroker wrote:

Deal with this all the time at work

Could be

wiring from cdi to ignition / kill switch / side stand ect

Coil, either replace or test the resistance

cdi unit only way is to replace once your sure its nothin else

stator check for resistance

pick up check for resistance

I have known for the magnatisam to break down on the magneto this is extreamly rare

Electrics are very frustrating but rewarding once you have pinpointed the problem

you can send the stator / picup off to west country windings for testing and werindings

with no spark problems always start from wiring to spark plug then down to the stator if all this fails to be the problem then its more than likely your cdi.

I have put a new coil on it, a new ht cap and plug another working cdi and checked all the wiring and checked the output from the stator which was bang on spec yet still no spark ill have another go tomorrow but if it still will not spark what else could it be.

FunkeyMunkeyDavid · Guru

knackered ht lead or dodgy earth/fried wire? cant be a lot you haven't tried/changed left

NEV · Guru

FunkeyMunkeyDavid wrote:
knackered ht lead or dodgy earth/fried wire? cant be a lot you haven't tried/changed left

Run round the bike ten times, shouting "I WANT MY BIKE TO START" bet ya not tried that yet!!