RD250LC stator coil’s resistance

[steve99]

Hi all,

looking for a bit of advice here

My RD250LC was hesitating at 2500rpm but otherwise ran perfect through the rev range.

 I noticed the low speed coil resistance was out of tolerance so I have just had the stator rebuilt.

 I got the stator back and fitted on the bike and the low speed is now perfect but it totally refuses to rev past 5500

I metered the coils and the high speed coil is 9ohms.   Tolerance is 5.1 ohm -+ 10% so max 5.6ohms according to the book

The winder is saying the reading is ok and the tolerance is not relevant and the cdi is probably faulty

The bike rev’d perfect before the rebuild and the high speed coil was in tolerance - rebuild for for low speed fault

Has anyone else had there stator rebuilt and would they please measure their resistance readings brown to black and brown to red

I really need to know if the fault is the stator resistance 



many thanks

[4l04ever]

Can you borrow a known working CDi to blow his excuse out the water???

[muttsnuts]

that's too high (9 ohms), the CDI won't like it, it will cause a fault, I had this out with west country windings a while back on a YPVS, they said it was fine even though the readings where too high, so I fitted a known working stator off another bike and the bike ran fine - eventually they accepted it wasn't correct, but it was a mare getting them to accept it was wrong

The CDI and coils expect a certain amount of resistance and spark energy from the exciter coils (low and high windings), if they are too far out of whack then it just doesn't work, be sure to check your pickup as well

One point to note, the transistion from the low speed windings to the high speed windings occurs between 5250 rpm and 5750 rpm normally, so you having an issue bang in the middle suggests its the high speed windings

HTH

[steve99]

Thanks for the information. I borrowed a cdi and it wasn’t that. After speaking to the winders again it turns out the stator came back with the red and brown wires the wrong way round. I have swapped them round and it appears to run ok now.

I used West Country windings as well and argued that the coil was out of tolerance but they insisted it didn’t matter.

Thanks

[Gitram]

quality control leaves something to be desired... still, glad it was an easy fix, eventually..

marti