Bike engine major stutter when accelerating

Broganhogan · L Plate Warrior Joined: 19 Dec 2017 Karma :

New to the forum so I'm not quite sure if this is the right place to be posting this however I need urgent help! My bike has recently starteded stuttering when I accelerate or even rev to/past 5k and feels although the engine just cuts out for half a second each jolt. I'm new to motorbikes and unfortunately clueless as to how they work. It feels like maybe the fuel isn't being used properly as soon as you accelerate. I tried starting the bike earlier and it would not start with the clutch in, although it would start in neutral. If anyone's has any ideas as to what the problem may be it would be a lifesaver to know.

FYI: It has been very cold recently so that may be a contributing factor to it, however the bike had been fine in the cold before, it just suddenly became weird one day riding it home.

Yamaha YBR 125[/quote]
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Brogan

The Shaggy D.A. · Super Spammer Joined: 12 Sep 2008 Karma :

Could be the side stand cutout switch, if there's a loose connection you'll get stuttering if the vibes hit right.

If not, is it fuel injected or carburettor? If you don't know, what year is it?
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Broganhogan · L Plate Warrior Joined: 19 Dec 2017 Karma :

It's a fuel injected bike got it around 2015 ish I think
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Brogan

Teflon-Mike · tl;dr Joined: 01 Jun 2010 Karma :

stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

Could also be water in the fuel. Have a look in the tank with a torch. Water would tend to settle to the bottom and appear like a "bubble" under the fuel.
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MCN · Super Spammer Joined: 22 Jul 2015 Karma :

My £££ is on a bad electrical connection. Making and breaking as you accelerate.

Check all connections.

Then check fueling isues

Water in tank is a good point to eliminate too.
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Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN.

Chris45 · Nitrous Nuisance Joined: 23 Oct 2016 Karma :

Courier265 · World Chat Champion Joined: 01 Oct 2017 Karma :

dodgy fuel can give a few issues, including water or some other gunk, that or it's yer plugs or the caps.

AldridgePrior · Banned Joined: 19 Oct 2017 Karma :

First thing I thought of was plugs. Fire a new set in for all they cost.

bikenut · World Chat Champion Joined: 21 Nov 2011 Karma :

you have a timing light, if so check for loss of ign at the revs you say.......if no timing light, then get a red neon plug cap and make an adaptor so it fits into the lead and onto the plug. This will give you a good cheap visual indication of ht loss, they don't cost much.

As mike says..........I assume you have checked fuel flow, plug and cap, listened/looked for ht tracking etc etc etc.....

get the red neon and rule out ign loss......

waiting for all the bs remarks about bs..........rule out ht loss and go from there..........report back with findings.
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