exwingnut Posted February 5, 2007 Share Posted February 5, 2007 I had the opportunity to go out and chase some sportbikes yesterday and was surprised to note the my 04 1150 GS was having some hesitation/surging in the 4750-6500 rpm range when accelerating in 4-5-6th gear and near or WOT. The engine seems to not want to rev normally and acts as if it is leaning out as performance improves if I close the throttle a little when it is hesitating. It seems to only happen when acceleration hard under a load (rolling on the throttle w/o shifting down.) I just completed my 42k service (43 k miles now), synced the t/b's then; plugs were good and gapped, I have not noticed any problems with the idle or normal performance since the service or now. I do regularly run the engine up these rpm's and have not felt this before. I first noticed the problem about 1/4 tank down after fueling out on the road (not my normal gas stops around home) at a Standard Station (92 octane.) Bike has had the canister-ectomy, air cleaner is good, fuel filter is in mid-lifespan. All is stock with the exception of the canister being removed. I am seriously considering running a injector cleaner/water displacer as the tank is now 8-10ths empty and a fresh tank of local gas to see if I got a bad tank-full. I am going to re-sync the t/b's tonight and check the clamps/gaskets on the t/b's for vacuum leaks, plugs for color, gap and tightness. Suggestions would be welcomed at this point; well most all suggestions anyway...be nice, Ed. Link to comment
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