Hi All thanks again for the responses,
RETRO;
TPS- Done
CO - Sensor adjusted, tried with higher & lower CO rates
issue remains
FIXITSAN;
So the Booster plug could work?
thought that the OEM ECU could not be remapped, where did you get yours remapped
suppose PC would be teh second best alternative to ECU remap?
Yes the booster plug *could* work, but then so might many other things too and probably at a lot less cost. I found the simple resistor mod helped a bit and led me to seek the remap. Nobody seems to have cured this 100% and I suspect it has a lot to do with the aggressive fuel cutting on overrun coupled with a jumpy ignition timing map. Look at the ignition map in the first post of the thread in the link below, the top left corner, although pretty standard can be a problem , as anyone who has adjusted an old fashioned distributor based ignition system when you make quick changes with the engine running at low rpm. It often causes a stall - http://ecuhacking.ac.../yamaha-tdm900/
A PC is a viable alternative however, there is no adjustment of ignition timing. This means that the jumpy low rpm table, and the torque reducer in lower gears , which is achieved partly by retarding the engine timing, are always present. Some people pay the money for the PC and a tuning session and walk away happy so it must work in some manner.
The ECU was remaped by Samios Motorsport in Greece (easy to Google and find on Facebook. They know what they're doing and test all their maps on a RR with as close a spec as the bike you have, in my case an opened airbox and a Scorpion exhaust. The TDM remap page is here - http://www.ecu-flash...yamaha-tdm-900/ It changed the character of the bike completely. The throttle is much less twitchy, provides a bit more torque within a smaller rotation of the throttle (at the lower end of it's travel), slightly less aggressive engine braking, pulling power in gears 2 and 3 the same as for first gear, so riding hard out of slow corners is unrestricted.
The downsides of a remap - from experience with cars I have tuned, the gearbox can often become a weak point, as can the clutch. I started to get a bit of clutch slipping recently so changed to a HD clutch, although my original had done 102,000 miles The gearbox ( the 900 gearbox is a delight anyway) is showing no signs of wear, jumping out of gears, whirring noises etc. Tyre wear at the rear has gone up with all this extra abuse, but the abuse is not compulsory.
Not all TDM900 ECU's can be programmed, and Samios will want a photo of the label on the ECU to be able to tell you if it's possible. I got lucky and found a compatible one on ebay for £65.
For the money I doubt a PC could improve on it, but that is my own subjective opinion. I definitely think it's worth the money and I have even changed back to the original ECU to see if my opinion has remained the same, and I find I much prefer the character of the engine with the remap.
Edited by fixitsan, 30 May 2018 - 08:18 pm.