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[sofiaspin]

Another thread on here identified the same surging at low throttle, and traced it back to starting the bike up when on the side stand. I may have done likewise, as the bike was running fine, then the stuttering started. It would appear to upset the ECU and the answer might be to repeat, then stop the bike, then start normally. Certainly the mods were done long before the stuttering raised its head. Too many sensors and wires going in and out of the bike. All I am after is for smoother running across the rev range and a bit more acceleration and top end. It only has 1300 on the clock so it will loosen up by 3000.

[oldnick]

Can recommend changing to 18th sprocket on the EuroIV B5. It makes 4th gear more useful on bendy roads achieving 50+ without feeling you are pushing it and cruising at 60 in 5th more relaxed. As to higher speeds, not brave enough to find out.

[Rattlebattle]

Buy and fit a carb conversion kit. Fit whatever exhaust and air filter you want and just rejet etc to suit. Simples. Even better now our host does a Mikuni carb conversion kit. Other opinions are available (but they’re wrong....). Seriously, the carb conversion is the best mod of the many I’ve done on my C5 and, no, I’m not a Luddite- I have a tuned Thruxton that I have remapped myself. I just don’t rate the EFI on Royal Enfields I’m afraid.

[sofiaspin]

Thanks for all the informed comments, and er, informed opinion. I think a 19th sprocket is needed and Rattle - well you might be right - I just sold my 08 classic iron ES today - but I quite like the Enfield Efi as it is primitive and feels a bit like a carb when running. Having gone this far on Efi mods I am inclined to finish the job with a PC

[andyo]

does the higher idle speed adjustment mod apply to the E4 continental GT too Ric ?

[ric]

I don’t know to be honest. The Euro III works off map and lambda for the vast majority of the fuelling but it’s possible to get them to either run weak enough to pink at one extreme or soot the exhaust pipe at the other whenever sitting (temporarily) at WOT . On Euro IV models the factory may well have extended the map range to prevent this adjustability.