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The TTR250 FAQ web pages -> TTR250 -> Repairs and maintenance -> Ignition pickup coil or sensor replacement
Post Info TOPIC: Ignition pickup coil or sensor replacement
TTRfan


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Ignition pickup coil or sensor replacement
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An owner in Laos has asked if I know of a source of ignition pickup coils as he has two of his rental TTRs out of action at the moment because they have failed.

I found this on the forum but am hoping someone can be more precise and point us in the right direction with a known part that works?

Hey guys, I've been thinking about this problem with the no spark and the pickup coil failing. I know the pickup coil is not sold separately, but there are a few other bikes out there that do have a separate pickup coil you can purchase and wire up without having to replace the entire stator assembly. Seeing as the factory service manual spec's out 200-330 ohms for proper pickup coil resistance, could one maybe find another pickup coil with the same resistance, assuming the mounting and configuration of the coil are physically the same, and replace just the pickup coil? From what I've found online already, Yamaha had a ATV called the Grizzly/Warrior in the early 1990's that uses a pickup coil rated for 200 ohms. I found a factory service manual and the tolerance for that specific pickup coil is like 160-220 ohms and from the looks of the pictures of that pickup coil, it appears to mount the same and looks very similar to the TTR250 pickup coil. If the pickup coil fits correctly, do you think this could work as a replacement? I know the operating resistance is slightly lower, so what about adding a small resistor to more closely match the TTR's factory spec'd resistance?

Stator - ignition pickup and connector.jpg




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ttboof


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Like it when you think out loud brian 

the trigger point is the induced voltage not the resistance, eg when the cdi unit sees 2v it fires. So the resistance isnt a must match figure as there isnt a voltage appled only reads the induced voltage 

things that may affect it is the shape of the voltage spike eg if it hits the trigger point too early or late.  but id try it in the ttr as its not a highly tuned 

well worth a try with an inline resistor as well may make a sligt difference in the trigger point (ign timimng )

 



-- Edited by ttboof on Thursday 21st of April 2016 10:48:05 PM

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