Twitch after changing up a gear

[AshWebster]

On the way to work today, nice day compared to yesterday. Filtered to the front at traffic lights in a 50. Set off sharp(ish) and got to 50 fairly quick, as is courteous when you have filtered to the front of a long queue. Now at 50 i changed up into 2nd (ready to go up into 3rd 4th etc) and suddenly my front wheel squirreled left and right. I managed to hold onto it but it did obviously shake me up a bit.

Any ideas for the cause of it? IM thinking maybe because i didnt put ANY revs on while i was changing up, so the inertia might have caused it. But im open to ideas. Posted this in new bikers as ive only passed my test a few months and still learning.

Cheers,

Ash
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Honda cg125 J reg peice of shit ---> CB650F ---> 2016 CBR600RR
Ford KA ---> 93' MR2 ---> 94'MR2 ---> 98' Subaru WRX STI Ver 3 (track car)

[Rogerborg]

I'm not entirely clear what happened there. The front going light is usually down to too much throttle. Shutting it off will generate engine braking, and will throw the weight forward, but shouldn't break traction on the front wheel.

Either way, the roads aren't in a great state, so just use more gradual inputs in future. Change up earlier, don't shut the throttle as much when changing up, clutch in earlier, let it out more gradually.
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Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

[davethekwak]

Are you sure it was the front end that twitched and not the back. Loss of traction at the back can feel like the steering is going a bit wild.
If you changed up but didn't use revs to match to new gear then you will have got sudden engine braking on the back wheel which could have caused it to loose traction briefly making the rear step out slightly. If you over corrected this it would move in the opposite direction which could make you think the front went left and right.
With current road conditions you want to minimise sudden traction or wheel load changes. Progressive braking, smooth clutch and throttle application with matched revs on gear change.

Roads are crap atm. I lost the back a few times on the way to work but knew it would happen as was playing with the ZX6R.
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ZX6R G2 (1999) & ZX6R F2 (1996). I like ZX6!

[AshWebster]

Cheers Roger. Yeh the roads are pretty slick, and maybe it was too much revs in first, ill try to adjust accordingly and learn from it .

edit: also thanks Dave, sounds about right tbh. I switched up the gear but didnt match the revs (d'oh). I agree with the ''shocking'' the system, which i do understand with the weight transfer etc causing loss of traction.
____________________
Honda cg125 J reg peice of shit ---> CB650F ---> 2016 CBR600RR
Ford KA ---> 93' MR2 ---> 94'MR2 ---> 98' Subaru WRX STI Ver 3 (track car)

[Baffler186]

I had that once before during spirited acceleration. There was a groove in the road which sort of knocked the front into a bit of a wobble. I was doing nearer 70 but same could have happened to you.
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Current: 2009 SV650 S, 1990 Kawasaki GT550
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