05-06-2014, 09:53 AM
(05-05-2014, 09:30 AM)Tortuga_imp Wrote:(05-05-2014, 09:23 AM)lackskill_imp Wrote:(05-05-2014, 08:32 AM)Tortuga_imp Wrote:(05-05-2014, 08:24 AM)lackskill_imp Wrote: Mine was due to chain slack being almost double spec on delivery... Once I adjusted it properly, it's as smooth as any modern injected bike I've been on.
Where does Herky-jerky come from?
Where does Herky-jerky come from?
chain slap. The slack in the chain will literally transition from top to bottom or vice versa depending on which throttle transition.
Think of it like pulling on a rope. If the rope has slack in it, you'll experience very little resistance followed by a sudden jerk. If the rope has no slack the resistance is linear and immediate.
The acceleration jerk is the transmission drive gear pulling on the chain and taking up the slack. The deceleration jerk is because of the final drive gear pulling on the chain and taking up the slack.
Where does Herky-jerky come from?
chain slap. The slack in the chain will literally transition from top to bottom or vice versa depending on which throttle transition.
Think of it like pulling on a rope. If the rope has slack in it, you'll experience very little resistance followed by a sudden jerk. If the rope has no slack the resistance is linear and immediate.
The acceleration jerk is the transmission drive gear pulling on the chain and taking up the slack. The deceleration jerk is because of the final drive gear pulling on the chain and taking up the slack.
Ok, thanks I feel bad now, I wasted your time explaining the symptoms to me.
What I was asking is where the EXPRESSION 'Herky jerky' came from.
Where does Herky-jerky come from?
chain slap. The slack in the chain will literally transition from top to bottom or vice versa depending on which throttle transition.
Think of it like pulling on a rope. If the rope has slack in it, you'll experience very little resistance followed by a sudden jerk. If the rope has no slack the resistance is linear and immediate.
The acceleration jerk is the transmission drive gear pulling on the chain and taking up the slack. The deceleration jerk is because of the final drive gear pulling on the chain and taking up the slack.
Ok, thanks I feel bad now, I wasted your time explaining the symptoms to me.
What I was asking is where the EXPRESSION 'Herky jerky' came from.
lol, no worries. I feel like a dummy for explaining it.
(05-05-2014, 09:28 AM)HikerToo_imp Wrote: You can tell the difference between drive train play, and RPM drops and surges...you can't fix what the PCV does by tightening a chain or throttle play, its different.
I haven't felt any throttle surge on this bike. Chain slap, yes. Twitchy tip-in, a little. Otherwise it's been very smooth for me.
I'm guessing there are at least 3 different types of throttle inconsistency symptom being discussed in here, maybe I misinterpreted the original question.