meanwhile, i'm not 100% sure about this but a very reliable and knowledgeable friend told me that disconnecting the battery for a while (30 mins to be safe) will reset all ecu settings to default, including AFR/CO. I haven't ECU'd my bike for about 5-6 years and its running fine. gave me 70+ once running ~250km highway going below 50km/h the whole time. but where's the fun in that? i rev it to 7-8k rpm and typically i get 40-45 in city, riding pretty aggressively. does about 120-125 top speed. This is on a very worn engine, compression is pretty low once hot, probably a badly worn cylinder, and a clutch which is almost finished. anyway, what i'm saying is you probably don't need to diagnose the ECU, except maybe to check what's going on, try seeing if disconnecting the battery resets it.
I completely disagree with the fi specifically having issues, the wiring harness though is absolutely crap quality. and tvs has used insulation tape to wrap the whole thing where they should have used sleeves and heat-shrink. I had quite a few wiring harness issues, which i've mostly fixed myself because I didn't want to buy a new harness for 3.5k. But look at it this way. For a 7 year old bike, is spending 3.5k really too much?
I mean, my upcoming engine overhaul is gonna be easily 3k for the clutch and maybe 5-10k for the engine depending on what all i'm gonna fix. this is including both parts and labour. as far as i'm concerned the fi system is pretty flawless, but the rest of the electrical and mechanical systems are quite poor in quality and longevity.
more essay later...
p.s. bike is a sep 2008 with ~48k on the odo
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