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Kev · # 7 03-11-09, 22:34

[quote=Logan;110773]Hi all

I've been looking through all the posts concerning the fuel mods which can be made to the XT660. I've decided that my personal preference would be to firstly try richening the mixture via the dash and if this doesn't satisfy go along the power commander route as I don't want to mess around with cutting wires etc.

My questions are simple really but I can't find an answer any where on the forum as most people seem to go with the Kev Mod.

1 - How much effect will the dash richening have on my Jan 06 XT660R? I don't expect miracles but less jerkiness would be appreciated as I spend most of my time doing CBT training at 15-20mph. It will only effect part throttle as mentioned in a above post. The Throttle position sensor reads between 16 to 100, when the ECU gets a reading of 19 from the TPS it will run a fix fuel map, the CO1 adjustment will have no effect after a TPS reading of 18. By adjusting the CO1 in the dash, it will only help part throttle between 16 & 18, I always recommend one to in crease their CO1 by at least 10 from the factory setting, as it will help in the closed & just open throttle postion.

2 - Will a power Commander V with a standard European Map cure the jerky throttle? The bike doesn't seem to surge it's just a bit jerky on and off the throttle at slow speed, from reading these forums it seems that this is mostly caused by the standard lean mixture. I can't get a custom map as we don't have a dyno centre in Jersey and I don't really want to shell out almost �300 for a minor improvement as I'd rather ride around it. A PCV will fit on any XT660 with or without a O2 sensor, the only benefits you would have with a PCV over the PCIII is one extra adjustable fuel throttle zone. We have a large selection of custom fuel maps in the ASK KEV section for supporting members if you can't get your bike on a Dyno. The XT's fuelling is far from perfect & can be improved by fitting a fuelling device. A Power Commander is by far the best fuelling device, if you can afford one I would get one, a custom fuel map is the way to go if you can.

By correcting the fuel map by adding a Power commander with your own dyno custom fuel map made for your bike, you will get a much better ride, but it will not cure your problem totally.

Any advice would be greatly appreciated.

Cheers!

Logan