Jerky Grabby Clutch

[adamkhan]

Noticed some Herky Jerky Bucking incidents while cruising at low speeds in the low gears yesterday. Almost like a really loose chain. Also clutch lever felt really clunky with late & abrupt sudden engagement. I wonder if the clutch hub springs are going bad. I know I'll need to get it remapped/ flashed for smoother idle & low end but there seems to be a mechanical issue too. Almost feels like the cables about to fail. It's only got 7500 miles on the bike.

[Antares]

Originally Posted by adamkhan

Noticed some Herky Jerky Bucking incidents while cruising at low speeds in the low gears yesterday. Almost like a really loose chain. Also clutch lever felt really clunky with late & abrupt sudden engagement. I wonder if the clutch hub springs are going bad. I know I'll need to get it remapped/ flashed for smoother idle & low end but there seems to be a mechanical issue too. Almost feels like the cables about to fail. It's only got 7500 miles on the bike.

Unlikely, the bike is just not smooth at crawling speed. Bike is sensitive to chain adjustment so check that first.

[adamkhan]

That's the first thing I checked. Since I installed the full system, it has been doing this "bruh bruh bruh bruh bruh" idle instead of smooth rpm and the exhaust gas mixture is rich. I'm hoping with a good MAP/ Tune it'll settle down but I feel it's mechanical with the clutch especially the way it feels during release of the lever. It clunks & grabs. I'm due for an oil change, sprocket & chain swap anyway so might open the clutch cover & check it out just to rule out any doubts.

[Antares]

Originally Posted by adamkhan

That's the first thing I checked. Since I installed the full system, it has been doing this "bruh bruh bruh bruh bruh" idle instead of smooth rpm and the exhaust gas mixture is rich. I'm hoping with a good MAP/ Tune it'll settle down but I feel it's mechanical with the clutch especially the way it feels during release of the lever. It clunks & grabs. I'm due for an oil change, sprocket & chain swap anyway so might open the clutch cover & check it out just to rule out any doubts.

I worried about the clutch like you but I'm 99% sure there is nothing wrong with it, full system the idle is always gonna chop and that's normal, as for the clutch release it does clunk as the system picks up the slack especially if you release it quicker, try letting the clutch out smoothly and slowly to see if it still does it. If it's a clitch issue it'd be very apparent.

[adamkhan]

Will do. Thanks.

[Jack]

Sounds like a mapping issue

[smithy]

Originally Posted by adamkhan

That's the first thing I checked. Since I installed the full system, it has been doing this "bruh bruh bruh bruh bruh" idle instead of smooth rpm and the exhaust gas mixture is rich. I'm hoping with a good MAP/ Tune it'll settle down.

They actually run lean in the lower RPM ranges to meet emissions rules/laws, hence the hunting idle and poor low rpm performance ....once above ~5500-6000rpm they run a little on the rich side.

A good tune/map will indeed sort it.

Smithy.