Jerky engine braking on '13 FB
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Road Master
Joined: Dec 2012
Posts: 848
Likes: 30
From: CO
Jerky engine braking on '13 FB
When I'm full closed throttle decelerating and engine braking, in any gear, when I get down to around 1700 rpm, there's this sudden jerk that must be in the drivetrain somewhere, and it doesn't feel like it's good for the engine. This is the only bike where I've felt such a thing. Most bikes decel smoothly all the way down to engine idle rpm with no problems.
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Road Master
Joined: Dec 2012
Posts: 848
Likes: 30
From: CO
I appreciate the input, but that's not it. You can't lug an engine on deceleration well above idle speed. This coming from experience on all sorts of manual transmission vehicles including every bike I've ever ridden.
Road Master
Joined: May 2008
Posts: 809
Likes: 23
From: Olathe KS
One of two things:
Either you have some slack in your primary OR 1700 rpm is about where you stop braking with the engine and transition to coasting. I'll try it out on my SB next time I ride, see if I notice anything like that.
Either you have some slack in your primary OR 1700 rpm is about where you stop braking with the engine and transition to coasting. I'll try it out on my SB next time I ride, see if I notice anything like that.
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Road Master
Joined: Dec 2012
Posts: 848
Likes: 30
From: CO
Cool thanks man, let me know. It does kinda feel like a slack thing, but it's done it since brand new.
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Road Warrior
Joined: Apr 2010
Posts: 1,403
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From: North Dakota
When you close the throttle above 2,500 rpm, extra fuel is added. You can probably hear a change in your exhaust note. When the rpm drop below 2,000 that extra fuel is removed and it feels like the engine braking eased off somewhat. Try it a few times letting off the throttle below 2,500 and then above 2,500 and you will notice the difference. Completely normal and both of my bikes do it.
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Road Master
Joined: Aug 2012
Posts: 854
Likes: 20
From: CT
Um, always...
This. The tune changes just under 2k. Less fuel, less timing. It changes the feel of engine braking. It's usually a pretty minor change in feel and you can hear it in the exhaust. Hard to say without feeling it but that might be what you're feeling. It might be able to be smoothed out with tuning. That's about the time you should pull the clutch in anyway.
When you close the throttle above 2,500 rpm, extra fuel is added. You can probably hear a change in your exhaust note. When the rpm drop below 2,000 that extra fuel is removed and it feels like the engine braking eased off somewhat. Try it a few times letting off the throttle below 2,500 and then above 2,500 and you will notice the difference. Completely normal and both of my bikes do it.