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[Rattlebattle]

Can't really help with that as mine always ran way too rich on EFI. It's better than it was but without a trip meter I can't be bothered to work out more mpg as it isn't an issue. Maybe 70 mpg? I doubt that it does anything like 103mpg though; if it did I'd be worried about excessive lean mixture. It has a 32mm carb, quite large for the mediocre performance - even Velo Venoms had a 30mm one, so it won't be that economical. A lot depends on riding style anyway, as I'm sure you know.

[ric]

Basically it's now running 3% weaker than it used to. When 'on tour' my engine only warms up once a day and I don't do heavy traffic so consequently my mpg is noticeably higher than my normal ride and the speed noticeably lower. If I'd been going my normal speed today I would have totally missed seeing a Griffin Vulture this afternoon and also probably fined by the local traffico who gave me the twice over as they passed by after catching me up in the downhill slalom section of the mountain road I was on.

[Rattlebattle]

Yes, there's a lot to be said for riding slowly and taking in the scenery; a Royal Enfield single is ideal for this. Wouldn't want one an as only bike though; hopeless for riding with friends, unless they're riding something similar. I'm not sure a carb conversion would be worth it in your case. For one thing as you probably know they don't compensate for altitude, which could be a problem unless you fancy re-jetting during a trip. Also, if you've had no issues with the EFI and tank range is an issue I suspect you'd be better off leaving well alone and putting the cash towards another trip. I know of three other people who got so p*ssed off with the EFI that they converted to carb. I would not have done so if I could have trusted the EFI not to play up with some different issue. Then again, I think the bike looks better with a carb and the intake suction noise is nice, plus I've got extra storage space and a fair bit less to go wrong.

[ric]

Your probaly right. Keep it till it fails! Only problem so far has been a dirty O2 sensor which caused mid range hesitation and some misfiring. The B5 is not my only bike although for scenic riding it's my preferred choice. If I'm not going anywhere specific seems pointless spending twice as much to get there which is why the Enfield has been tweaked for economy over speed! For group rides with friends I have something that is slightly quicker

Zonggong
thinking about your problem, could I suggest you try adjusting the mixture screw at optimum then give it an eight of a turn richer and then gradually increase the tick over which should reduce the banging.

[Rattlebattle]

You could try running it in open loop on the base map by removing the O2 sensor and blanking the hole. You just need a resistor to plug in where the O2 sensor connects to avoid the MIL lighting up. The base map isn't bad and without the O2 sensor the ECU won't drag the fuelling back to stoichmetric - great for emissions but not so good for performance. Plus it's one less potential fault. Mine ran well in this state until other gremlins got in....It's worth a try at minimal cost.

[scotty]

Im curious how does it go with your mot going backwards to a carby thought all newish bikes in uk/eu had to be efi for pollution regs or dont they worry. Talk of new laws in aust re helmets being date stamped will have to get them checked at rego check if over 5 years old new hat.we pay $25 for a rego check this will give them a excuse to up the fees again.cant even get a sympathy reduction for owning a royal enfield. Ha ha.

[ric]

Motorcycles need to comply with the relevant emission standards at the point of sale. At the moment there is no testing despite pollutant levels now found in the vehicle registration documents for those with engines over 125cc.

[zonggong]

Thanks to everyone for their suggestions and the general information sharing. I received the copper crush washers from Mr H on Friday so was able to install one this morning and test ride this afternoon. The purpose of doing this is to eliminate any possible exhaust air leak that could contribute to exhaust banging. Interestingly, the gasket in my exhaust turned out to be a copper crush washer and not the 'cement biscuit washer' that Deanobats had. I reckon my bike is a Friday afternoon version anyway, made up of what was left over, so this is no real surprise. The used copper washer did not seem to have been fitted evenly and was crushed much more on one side than the other with a possible location for an air leak on the clutch side stud area - bit hard to tell . The test ride showed there was still some burbling/popping but I didn't get the loud singular 'bang' I was getting previously. If there was an air leak then the mixture was likely to have been on the rich side so retuned the mixture screw to 2 turns out. The burbling/popping was no worse than I was getting with the EFI. I have a throttle slide with a 3.5 cutaway on order from Mr H and will experiment with this to see how the idling/initial throttle openings are affected with this.