K3 - 23mpg?

[Kieren2492]

Ive recently brought my SV and after the first 2 weeks I had to replace my throttle position sensor as it wouldnt start. I got the TPS from a K5 SV (I know the history of the K5 it was fine) and now I have 60 miles to a tank D: which is 23 MPG (roughly).

.I have a 33bhp restriction (throttle + air intake)
.The brakes aren't binding
.The chain is fine to my knowledge
.I don't ride completely recklessly

Would I need to get it re-mapped?
any help greatly appreciated :), Kieren.

[EssexDave]

I'm afraid it's no good. I can offer you £50 and a mars bar for it. Best you'll get for one when that happens...

Pull your plugs out, have a look at them. If they're properly black chances are it's running too rich.
Could be a fuel leak somewhere along the line (whether tank/or fuel lines)

That is pretty poor so chances are it's something pretty drastic that should be obviously when it's found.

[Kieren2492]

So does this mean that the bikes no good and need to cut my losses or should I persevere? :S

[andrewsmith]

Throttle bodies probably need balanced

[barwel1992]

You did set the tps up didn't you ? If not have a serch on hear for the guide

[yorkie_chris]

Yeah probably needs setting up, what did you replace the TPS for?

[embee]

If that mpg is accurate I'm surprised it will actually run. That's typically twice the correct amount of fuel used, way too rich for an engine to run under normal circumstances.

[Gareth]

Throttle bodies probably need balanced

+1

[DanSp]

Just to offer a slightly different angle... check your air filter too... i got a 33% increase in fuel economy by changing from a re-useable K&N to a standard paper filter!

[Kieren2492]

My original TPS was faulty and wouldnt let the bike start in the first place, I checked it with a voltmeter and the voltage flowing through it was irattic, so I replaced it and set it to kick in at 2K revs and it was running beautifully but the fuel light came on at 60 miles. I've been doing some thinking and I am doing very short journeys (3 miles) in the almost freezing cold (not above 5 centigrade)

I've put the TPS back to 3K now and I will see how I get on. What would a throttle body adjusment do? cheers for the replies btw :)

[barwel1992]

Balancing the throttle bodies means that both bodies open at exactly the same allowing the same amount of air and fuel through at the exact same time if there off it can leed to ruff running, usually one way to tell is if one of the exhaust pipes has gone blue

[andrewsmith]

Balancing the throttle bodies means that both bodies open at exactly the same allowing the same amount of air and fuel through at the exact same time if there off it can leed to ruff running, usually one way to tell is if one of the exhaust pipes has gone blue

This

Carbs are affected in the same way. Is your motor running lumpy at idle? Is
the Idle constantly blipping
Get them balanced as it'll probably cure it

[Kieren2492]

The engine is running smooth, it isnt lumpy or sluggish and idles fine. I'm getting it serviced soon so i'll get it done then :)

[jambo]

All 3 mile trips means the whole tank has been used on a cold engine. This has been discussed a number of times and if that's what you need it to do, then that's what you need it to do, but it's not giving the engine an easy life.

I'd be very surprised if the throttle bodies could be out by enough to cause 23 mpg, and the bike still ride anything at all like right.

I'd suspect either the fuel economy it's being calculated slightly wrong (easy to do on one tank) or you have an issue with the engine never coming off cold start map.

A longer run from a full tank would help check the fuel economy under more normal circumstances.

Jambo
Sent from my thingie

[LewSpeight]

Speak to Yorkie Chris up there ^

I had this problem not long back and I found dangling money infront of his face tends to get things fixed.
Mines had numerous changes/adjustments and stuff and now I'm running about 52 mpg.
May turn out that you need to remap your ecu, I stuck another ecu in it and it made a hell of a difference

[nikon70]

Was the tank full ?? Or half tank? - worth asking ;)