Don’t lubricate cables with WD40, it may work in the short term but the WD will attack the plastic lining of the cable causing it to swell and make the problem worse.Just a thought and maybe easy to check and or rectify, but does it have a quick action throttle fitted? Sounds like you need a more progressive action. Also, and sorry about going on but, has it got a heavy throttle spring or a gunged up cable? My Darmah had that when I first bought it and it was a pig to ride in town. I stupidly persevered with it for an embarrassingly long time until my mate suggested I put some WD40 in the cable. Different ride entirely…