DT125R FORUM

The DTX comes fitted with a 3MB. It's only the very early 89/88 models that came with the 3BN cylinders. Otherwise all years ran the same cylinder. Surprising there isn't more availability given how many of them were made etc

As I say, one issue is the radiator cap spring looses tension so try replacing that. I just use a cheap Chinese one on my DTR with a temperature sensor in it and it's been sound. Another problem could be the thermostat as given up, maybe it's locked closed so it's not regulating temperature correctly.

Oh wow, well you'll be pleased to know not much has changed in the last 20 years for two strokes. Port tuning is as it's always been and fuel injection came a few years ago on nothing but the most elite machines. These bikes are a doddle to get running, so throw up any questions you may have and we'll point you in the right direction.

@HOTSHOT-III Ok cheers mate for that, I’ve ordered what you recommended Cheers