ninja 250 high fuel consumption

[mysterious_rider]

Cost me £8, 90 to do 67 miles today. What is that all about?
2010 model barely 4k miles in total. Standard front sprocket 49t rear. Tops out at81mph.. shame cos it handles nice. Any ideas?
____________________
KAWASAKIIIII

[DMCpro]

What's that, about 50mpg? On fuelly there are a few getting less and a few getting more maybe it's due a service.
____________________
Honda CB-1, TS125X
VW Golf Estate

[Kickstart]

Hi

Works out at about 45mpg which does sound pretty bad for a little 4 stroke twin. And 81mph sounds way too slow.

Could be loads of things. Needs a service (badly!). Brakes dragging. 30 stone rider. Etc. Any thing not feel right with the bike?

All the best

Keith
____________________
Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Rogerborg]

It's burning way too much fuel. Plugs out to confirm, I'd suspect the lambda sensor(s) or associated wiring.
____________________
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

[Clutchy]

How long do you spend 'warming your bike up' every day.


I know people who spend around 5 mins 2-3 times a day warming up their bike and wonder why their fuel consumption is higher than others with the same model!


Just a thought, unlikely to be your issue though
____________________
Malaguti F12 Phantom-Dead, Suzuki AY50- Dead, NRG power DD LQ, CBR125.
*33 BHP restriction up on 10/12/14* Current bikes/car: SV 650 S/ MKIV GOLF
Guide to pass your test with no lessons!

[P.]

Sounds downgeared... should see 100mph.

[iooi]

[mysterious_rider]

1, 34 a litre. I don't warm it up I just ride it. I've bought a 41t sprocket from usa to sort it. It used to have a really high idle but aftrr a few days I could actually lower it now and it doesn't stall. Rides and drives well.
I'm also under fifteen stone and the bike is Street fightered.
____________________
KAWASAKIIIII

[_Iain_]

Should be 14-43 on a UK spec Ninja 250.

Also, the USA for a sprocket? Seems an expensive way to get one - you'll get rimmed for import duties & hefty shipping. Plus, I have a 38,41,42,43 & a 44 on the shelf in Kent
____________________
Please be aware that the above post may be full of complete nonsense.
Riding: '07 KTM Duke II, Baotian BT49QT-20 Driving: '88 Volvo 340

[iooi]

Street fightered. So you have increased the wind resistance. Changing the sprocket is making the engine work harder to get you to cruising speeds.

Just how do you ride it?
Throttle to the stop, or bimble along?

Going to make a massive difference. As can be Seen here

[mysterious_rider]

Sensible riding to work, along with odd blast with a friend.

wemoto told me the standard was a 49t rear... Hm.

Anyway new one on way, £30 inc import fees allgedly so can't complain.
____________________
KAWASAKIIIII

[Kickstart]

[sidewinder]

Lad in works returns 70 ish mpg and does about 110 tops

[_Iain_]

[mysterious_rider]

turns out j49 on the sprocket wasnt the number of teeth.

It was a 42t all along, new sprocket came, 41t.


squeezed 91mph out of it, proper nailing it. Barely cruises at 60-65. It struggles a bit.

Also, £5 of fuel will get me 38 miles.
____________________
KAWASAKIIIII

[Fladdem]

What's the throttle response like? Is it boggy? Could be running massively rich, that would cause a slow top speed and higher fuel consumption.

My mate had one before his R6, same year, and he reckons he got the clock reading 115 and got around 75mpg, IIRC. I remember being impressed that the tank range seemed similar to my Varadero's.

Does she rev cleanly? She may just need a proper service, possibly dirty air filter restricting air flow? Like someone else suggested, a broken Lambda sensor will cause all kinds of issues, telling the engine it's running lean, so can pump more fuel in etc... TPS damaged. If that's worn, she might feel jumpy while riding and may be sending the wrong signals to the ECU, again telling it that you're at full throttle when you aren't.

I don't know, does it have engine check lights fitted?

If not, I vote plug removal and inspection!
____________________
Current:1991 Honda MT50 (Soon to be a H100/MTX/MT5 hybrid), 1976 Honda Cub C70, 2005 Honda Varadero 125, 1993 Yamaha TTR250 Open Enduro , 2010 Road Legal Stomp YX140, 1994 Honda CRM 250 MK III, 1999 Cagiva Mito 125, 1992 Honda CB400 Super Four, Stomp T4 230, 1984 Honda H100s, 2009 Sym XS125K
Past:2003 Aprilia RS125, 1982 Kawasaki GPZ550(FREE BIKE!)
I'm having more fun than a well-oiled midget.

[mysterious_rider]

Ah it's strange, the throttle is snappy, but being gentle with it and its lovely.

Runs nice, no problems. maybe new filter is on the cards... May have a look tomoz.
____________________
KAWASAKIIIII

[mysterious_rider]

I looked online and everyone is trying to hit 100mpg.


Im sitting on my bike that drinks fuel and im like BRAPPPP.


I'll replace the air filter tomoz (if its dirty), otherwise I may remove the lambda sensor wiring and see what happens.
____________________
KAWASAKIIIII

[mysterious_rider]

If I disconnect the lambda sensor it has slightly better bottom range but she tops out at 70 mph. Haha I'll try the air filter.
____________________
KAWASAKIIIII

[wots]

How about a Lambda eliminator? It won't cause a fault and if the lambda is the problem it will run much better. I had a quick look on ebay but couldn't see one for this bike. I've got one here for my ER-6.
____________________
Currently: Yamaha DT 125 LC2,Repsol Fireblade, and Bumblebee MSX 125