Full throttle lumpy

[Knisis]

Hi, Have a bit of prob with my Honda City Fly. Went out for a ride last night, and noticed if I try and open the throttle fully it seems to stutter (as if it low on fuel), it's all right if I keep to lower power.

Very worrying as I as on a dual carriage way passing a lorry when it happened, and had to drop right back.

Also, even after an hour on the road, if I take the choke full off, it stalls no matter how slowly I twist the throttle.

Thinking of taking in for a full service etc.

Any suggestions before I spend a fortune?

[Jammy-G]

Hmm sounds like what happened to mine.

I am not 100% here but It might have stuttured when opening it up because the increase of revvs would 'blow out' the spark, causing it to misfire. Change the plug if you havn't already.

Has it only just started doing this? After my accident, my bike would die idling without the choke out even when the bike was warm. I just ran it for a bit and it seemed to sort itself out.


My advice - new plug
____________________
RooRoo: just like the time i stuck my finger up my arse with no lube at all and she didnt talk to me for hours

[mchaggis]

Does the lumpiness only occur past about 3/4 throttle, and not below that?
If it's only affecting part of your throttle range, it's likely that the high end jet is a bit blocked.

There are multiple jets in your carburettor for different throttle positions, as the vacuum in the carburettor is moved around it as you change the throttle, so it sucks fuel at different rates through each one.

Basically, remove the carburettor and give it a good clean out, especially including blowing compressed air through all the jets.
____________________
I must not be a troll...
Mmmm, Guinness
Discovering the delights of Hammerite and a 3/4" brush.

[stinkwheel]

Carb icing? 'tis the time of year.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[stevo as b4]

That is a problem that can occur on the CG125 also. It does sound more fuel related than anything, but do the usual checks/maintanece items first.
Check airfilter,sparkplug,HT lead, plug cap, timing etc. strip and clean the carb and all the jets. Make sure you dont have stale fuel, and that there are no kinks or blockages in the fuel line, filters, or tap that may cause fuel starvation. If everything else is ok, it could be a problem with the accelerator pump on the carb, either a blocked jet etc, or badly adjusted.

[binge]

I had that problem with my Speedfight. And I found out that it was flooding out with air...
It is like if you buy a standard restricted scooter, and try to ride it without the air box on (Just an open carb) It just dies out when on full throttel...

I have a question tho.
When I go to start my scooter from cold (Weather its 30*F or weather its 100*F) I have to use the choke to start my scooter.
Even if I just put it on, Let it fire up then turn it off. The choke HAS to be on for the bike to fire ...

Any suggestions???

<|Binge|>
____________________
- Honda XL125S - CBR400 NC29 - VFR400 NC30 - CBR400 NC29 - TL1000R - TeeZeR Pit! - Bandit 12 - YZF450 - LuckyMX125 Pit! - Demon X XLR 140 Pit!
- Stomp KZ 160 Pit! - Demon X D-link 140 Pit! - CRF50F Mini-Pit - MonsterMoto 155cc MiniSM - Honda Chaly 150cc - Yamaha 98' R1
- Honda Chaly 140cc - Thumpstar 190cc 4v MiniSM - Aprilia RS125 Pit-Bike -

[pipnet11]

[Knisis]

Well, I had a look at the spark plug and replaced the oil, but no improvement. Phoned a local dealer and arranged to have it serviced on Monday, as it's due for it's 5K service.

[Knisis]

Had bike serviced, pick it up tomorrow. Mechanic said it was a blocked carb.

[mchaggis]

Yay, some feedback from a Workshop user and I was right.
____________________
I must not be a troll...
Mmmm, Guinness
Discovering the delights of Hammerite and a 3/4" brush.