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About londongripper

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  1. Just took out the air filter, tried it again and if anything, it may have gotten worse even (also in 2nd gear, serious jumping back and forth). Seems to happen more in lower revs, when throttle is kept constant. Bike always fires up perfectly. Idle speed is 1.5k which seems perfect. Battery is new, and measured (also under load), and perfect. I did notice quite a petrol-smell today, may have been other things on the road, but just road it for a bit and it kept following me it seems. Spark is brand-new. Any other ideas?
  2. Thanks for the quick response, you reckon it's fine to run it without a filter (for a brief test ride only I mean)? Not entirely sure what may be pulled into the engine there? But that would at least sound like the most straight-forward test of all indeed. Smoke, not really. I'll try again and see if I can detect something — smelled a bit like burned plastic last night, but not sure if that actually had anything to do with it at all (two motorcycles, may have touched boots to exhaust or whatever)
  3. Hello, I've tried and tried again to get the search working for me, but I failed miserably. So I'll try and see if any of the pros here can help out for a second. My girlfriend got back into motorcycles, we found a YBR 250 for her (fuel-injected, 40k miles, pristine visual condition), but now she's having issues in 3rd gear and up with the bike jumping a bit (I've noticed this as well, but I figured it may be my non-female weight and abused throttle-hand). Previous owner changed oil and oil filters (mechanics did) recently. Checked the spark plug, black, sooty but not oily. Seems to
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