Hornet 600 running like a dog at low revs

[bikertomm]

Hi all, me again...

As my hornet has been tucked under a cover for a good few months I took it out around the block today.

(I do start it relatively often)

It feels, different. The steering feels seriously different like stiff when it's straight and then when it wants to turn it really wants to turn!

Wondering if this could be down to the head bearings stiffening over the winter not being used much?

Anyway, my real concern was the engine, it sounded a bit 'mis-firey' when pulling away up to around 5k. Almost like it was firing very wrong. Then after 5k it took off and sounded as normal.

(This was after she was warmed up)

I thought some ham fist might help so gave her a good old run through the revs, but still, as I pulled off from low mph it sounds like it's running very rough indeed.

Does anyone have any ideas? Is this normal when you leave a bike for a bit?

Thankyou!
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07' Honda Hornet now full powaah! My guide on performing an oil change!

[mudcow007]

checked tyre pressures?

[Paddy Blake]

As above tyre pressure and the battery.

The battery might be on its way out or need charging.

[P.addy]

Would be checking tyre pressures, making sure brakes are free and check the head bearings

[cb1rocket]

Water/condensation in fuel tank. Put fresh fuel in it, change the plugs or check and clean em
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Honda H100S2 Rebuild - https://www.bikechatforums.com/viewtopic.php?t=253852

[bikertomm]

Thanks guys, tyre pressures were pretty good..

What's the best way to check head bearings get the front wheel of the floor and give the bars a left to right to feel them?

And hmmm. Water in the tank doesn't sound good. I will fill up straight away next time and see how she goes.

Should I not be too worried about the rough low rpm's?

Cheers
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07' Honda Hornet now full powaah! My guide on performing an oil change!

[Llama-Farmer]

My Hornet (99, so carb'd) sometimes runs a tiny bit rough if its not been run for a while.

Especially when first started when the engine is cold, and the choke is out, any revs make it sound like its misfiring.

Under load, i.e. once riding off it runs fine.
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Current Bike: 1999 Honda CB600 FX Hornet
Next Bike: I want a CBR-RR. And I want an F800 GS-A. And a VFR 800. Can I have all 3?
Dream Bikes: Honda VFR750R RC30, Honda NSR500, Ducati 996 R

[RhynoCZ]

Going rough at low rpm could be caused by a dirty air filter, or a exhaust leak combined with the O2 sensor not getting the right amount of exhaust gases.

If it was carbed then I'd suggest they are out of sync, but your motorcycle is fuel injected. Can the DFi units be out of sync?
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[Paddy Blake]

Could be water in carbs.
There is a drain screw in the bottom to drain each one.

Be sure the battery is charged.

My Hornet never got through a winter on one battery.

[RhynoCZ]

[FriendlyEllis]

Hi Tom

I have a Haynes manual for your bike. I live in Leighton Buzzard if you want it?

I'll only eBay it otherwise?
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Honda CB600F Hornet 2013 -> Kawasaki Z1000SX ABS Tourer 2015

[Nemo]

Probably just fuel that's "gone off".

As for the bearings, YouTube how to lift front whhel off ground on side stand (can't be arsed to write it lol) and check for a notchy feeling (will be in the centre position if anything).
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Previously owned: Kawasaki KH125, Suzuki GP125, Suzuki GX 125, Honda CB125 TDC '83, Honda ntv 600, Kawasaki ER5, Kawasaki ZZR600, Aprilia RSV 1000 Mille
Now own: Ducati 848 evo