tonk Posted October 18, 2013 Report Share Posted October 18, 2013 That's not an instruction to strangle your missus' clopper... On a neutral throttle my bike is getting unbearable, it hunts, jumps, snatches, lurches. Makes roundabouts a total pain. I've asked the dealer and it's not something they can fix but is a known issue. (Thanks for nothing) Someone mentioned an article in Bike mag about this problem but I missed that issue. It's the same on standard can and filters or an open AC Schnitzer can and BMC race filters. Higher octane fuel helps a bit but I can't afford that all the time these days - supposed to run it on 98 all the time but it has knock sensors for 95. I'm planning on keeping it for a while so am I looking at a power commander as the only option? Fitting one doesn't faze me (once I've saved up!) but tuning it is putting me off. I don't want to go to a dyno shop and have someone else fix the problem, that way I won't learn anything. Are these things tuneable by a muppet like me? Link to comment Share on other sites More sharing options...
lorenzo Posted October 19, 2013 Report Share Posted October 19, 2013 You could always find a nice friendly tuning place who'll let you sit in the dyno room while they do it and guide you through each change they make. Without a dyno any changes you make on a power commander are only going to be 'best guess' type things anyway, and simply downloading a map isn't going to teach you a great deal, essentially you'll just be updating a bit of firmware or something, Where in the world are you, maybe somebody knows a friendly dyno guy near you? A mate of mine's just done a deal on a dynojet 250, so he should be able to help you out soon, if you're near to stockport? Link to comment Share on other sites More sharing options...
tonk Posted October 19, 2013 Author Report Share Posted October 19, 2013 It's a BMW K1300S, normally has an open can with no cat and BMC race filters and it has a factory quickshifter on it. Stockport is a long way but thanks for the offer, there's a guy down the road with a mobile dyno. He does my tyres so I could ask him about tuning. Can't it be done with my own laptop or does it have to be on a dyno? I'm really ignorant about dynos and power commanders etc, sorry for being stupid Link to comment Share on other sites More sharing options...
tonk Posted October 19, 2013 Author Report Share Posted October 19, 2013 Had a look on the dynojet site, £350 for a power commander V, five maps for download. Will it accommodate the quickshifter if it's fitted? Does it stay on the bike all the time or is it just a tuning tool? Will it fit another bike if I sell this one? Will it cure the snatch? Sorry for all the questions! Link to comment Share on other sites More sharing options...
tonk Posted October 19, 2013 Author Report Share Posted October 19, 2013 Cheers Mr Parts (and others), plenty to go on now, might see if they'll give me some discount at the NEC Link to comment Share on other sites More sharing options...
2moto Posted October 19, 2013 Report Share Posted October 19, 2013 I'd make sure to look at the basics first. Has it always done this or is a new "feature"? I presume the throttle cable is not too slack or too tight? Nothing sticking in the throttle linkages? Since the K series is fuel injected, I'd make sure that the throttle position sensor (TPS) is calibrated to factory spec. Next, I'd check that the throttle bodies are synchronised. Don't know if this is adjustable in the K series, but definitely worth checking with vacuum gauges. How many miles are on the bike? Things like sticky or dirty fuel injectors can also be culprits. TBH, it sounds like your dealer is a bit of a twat. Have you rung a couple of independent BMW specialists for advice? I'd certainly do all that before I'd chuck money at a power commander which might not even be necessary. You'll need to find a pretty clued-up dyno guy as they are usually just interested in power gains, not improving fueling off idle. Link to comment Share on other sites More sharing options...
tonk Posted October 19, 2013 Author Report Share Posted October 19, 2013 I'm near Hull KP, should have said earlier. It has 11,000 miles on it now, 9k done since since I got it last December. Just out of warranty. I've had 2 K1200S before this and an HP2 Sport, they were all grotty on a neutral throttle which is always made worse with a shaft drive. Recently I rode an S1000RR which was butter-smooth and really highlighted the lurching on mine. I've checked the slack on the cables (two), made sure the twist-grip is smooth, had the tank off and reset the TPS after clearing the memory. It's had a bottle of injector cleaner too and the air filters have been washed, dried and re-oiled. I can't do any synch work on the throttle bodies, not only is it beyond me but they all work off a shared rod and there's nothing I can see to adjust or even connect a vacuum hose to. The only thing I can't check at all is the servo powered flap in the exhaust just before the end can. I can see it open and close properly on the start-up self-test but other than that, who knows? The whole K series from 2004 onwards are known for snatchy fuelling. I think its the wet roads and roundabouts that have brought it to the fore, wasn't too bothered in the dry summer but I'm getting some twitchy moments and intend to commute through winter as usual. Not sure if this is related but the tip of the end can is very sooty. Link to comment Share on other sites More sharing options...
tonk Posted October 20, 2013 Author Report Share Posted October 20, 2013 Cheers KP, much appreciated. Can dynos sort fueling on part throttle? I thought you just cracked it wide open through every gear with a view to looking at the power and torque curves. I've been sniffing around a couple of BMW forums (zzzzz) and everyone seems to have the same problem to varying degrees. Some have fixed it with something called Rapidbike, which is like a Power Commander - giving control over ignition and fuel. There's specific maps for my bike but it's tuneable too. I found an importer and dynojet tuner in Malton which isn't that far from me. It comes with a switch for 2 maps, eg economy and power. Just don't know the price yet. I'll give John a ring though first seeing that you recommended him Link to comment Share on other sites More sharing options...
2moto Posted October 20, 2013 Report Share Posted October 20, 2013 Warrington's in Malton...hmmmmm. I wouldn't get hung up on what the tuning box is called. It is far more important to find a tuner who has experience in fixing the issue you're facing, whether that's using a Power Commander, RapidBike, Ignitech, Motec, or whatever. Link to comment Share on other sites More sharing options...
tonk Posted October 20, 2013 Author Report Share Posted October 20, 2013 Warrington's in Malton...hmmmmm. I'll take that as a subtly worded warning to stay away! Link to comment Share on other sites More sharing options...
2moto Posted October 20, 2013 Report Share Posted October 20, 2013 He's OK, but not sure he would be my first choice to sort your type of problem, IMO. Link to comment Share on other sites More sharing options...
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