Head scratcher
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@StanKn The emulsion tube is the long brass tube the main jet screws into yes. If you haven't done this yet you'll need to get this out (screw the main jet back in without the brass washer and lightly tap it), make sure all the holes in the tube are unblocked and also check its air feed is clear, this is the small clear tube which pushes onto a brass tube on the right of the carb body just in front of the carb-to-airbox rubber (it's a very small hole and difficult to blow through).
What happens over time is the space between the carb body and emulsion tube accumulates moisture and debris and this blocks more and more of the holes until it just starts fourstroking one day.
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@SpookDog I wouldn't get excited about the shrink wrap, it's not a DTR after all.
https://motorradteilehannover.de/Yamaha-TDR-125-5AN-Bj-1997-control-unit-CDI-control-part-A3999
Does look very similar to a DTRE ignition system though. Zeeltronic might be a good upgrade to the TDR ignition system.
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@HOTSHOT-III thanks mate you were write , feel like such an arse currently there's was around 10 years of crud in the emulsion tube. I overthinked like mad feels a bit silly hahaha. She's is running a real treat took awhile to get the tube out not sure its even been out before
RE was a boring class I had to sit through when I was 10 years old…
. I hope so too 