Its getting sold!! That was why I was trying to get it sorted as its my GF's and her son was using it for school but needs a car for uni, neither of us wanted to sell it with a fault so I persevered. Would have been much easier with a carb!

Love watching it but as usual get extremely annoyed with Eurosport when you record it only to find its half an hour of feckin snooker
They don't seem to have mentioned Liai Sanz at all this year, wonder why?

It runs!!!
Replaced the ecu tonight and done a couple of cold starts and several hot starts and it sits and ticks over like a Swiss watch so anyone want to buy a fuel pump, throttle body, oil temp sensor and a lambda probe for a cb125f?

Thanks for the help and advice all

Tempted to do that but I'd like to resolve this plus it's being sold and I'd rather sell it honestly than bodge it, luckily the parts are cheap second hand

The saga continues, replacement oil sensor and lambda probe made no change, however I did a test with it running with the spare oil sensor connected but not in the engine so it was seeing cold oil all the time and it sits fine st about 200rpm, switch it over to the oil sensor in the engine that's ho...

Again I know this was the cbf125 so not the same model, but I had to change my ecu as it was leaning the mixture too much when warm. Secondhand ones can be picked up for near £20... maybe worth a try? Thankfully parts are cheap and I should be able to recover some money from the parts I have fitted...

That's very nice!!

What's an IACV ? Edit - (Googled it now and found out its an idle air control valve, that's a know issue on the cbf125, not the cb125f that I'm working on, don't think as far as I can find out that the cb125f has an idle air control valve) It came with the injector etc and the sensors on the throttl...

And a replacement fuel pump did nothing either, wonder if a box of matches would solve it?
I suppose the next bit is air and oil temp sensor, surely can't be the lambda sensor

Well a replacement throttle body didn't solve the issues, spoke to the local Honda dealer prior to ordering the throttle body from eBay, there service guy said that unless the engine management light was on there would be no fault codes to read and they would just throw parts at it so better to save...