Resend my activation email : Register : Log in 
BCF: Bike Chat Forums


Excessive Fuel Usage

Reply to topic
Bike Chat Forums Index -> The Workshop Goto page 1, 2  Next
View previous topic : View next topic  
Author Message

calyx
World Chat Champion



Joined: 11 Dec 2008
Karma :

PostPosted: 00:49 - 10 Feb 2011    Post subject: Excessive Fuel Usage Reply with quote

Hi,

We have 400cc Burgman. (fuel injected scooter)
I normally get 65-70mpg. It suddenly dropped to 35mpg.

What could be the reason?

(Rpm / speed is same as before)

Cheers.
____________________
Boris - London
 Back to top
View user's profile Send private message You must be logged in to rate posts

mattsprattuk
Super Spammer



Joined: 12 Mar 2007
Karma :

PostPosted: 00:50 - 10 Feb 2011    Post subject: Reply with quote

fuel prices.
putting a tenner in doesnt get you as far
____________________
Blue_SV650S wrote: it was a sh1te wheelie, but it proves that he can get it up in 3rd and can do angles. In summery, mattsprattuk is a gobby little sh1tebag, dopehead tw4t, but sadly for all of us, he probably isn't THAT full of sh1te!! Mr. Green
Kickstart wrote: Hi I tend to agree with Matt. All the best Keith
 Back to top
View user's profile Send private message You must be logged in to rate posts

Ingah
World Chat Champion



Joined: 10 Apr 2009
Karma :

PostPosted: 02:17 - 10 Feb 2011    Post subject: Reply with quote

Slow leak - check rubbers and fuel connections?
____________________
-- Ingah
 Back to top
View user's profile Send private message Visit poster's website You must be logged in to rate posts

Benson_JV
World Chat Champion



Joined: 04 May 2010
Karma :

PostPosted: 08:20 - 10 Feb 2011    Post subject: Reply with quote

Perhaps try a different petrol station? Could be some dodgy fuel?
____________________
Willson - "If you go out on that CBR600 in the winter, you're going to do more miles on your side than on your wheels."
Riding: CBR600FW Driving: Audi A6
Previous Bikes: '96 Bandit 600, '96 GPz305
 Back to top
View user's profile Send private message Send e-mail Visit poster's website You must be logged in to rate posts

yen_powell
World Chat Champion



Joined: 22 Jun 2008
Karma :

PostPosted: 09:58 - 10 Feb 2011    Post subject: Re: Excessive Fuel Usage Reply with quote

calyx wrote:
Hi,

We have 400cc Burgman. (fuel injected scooter)
I normally get 65-70mpg. It suddenly dropped to 35mpg.

What could be the reason?

(Rpm / speed is same as before)

Cheers.
Filthy air filter? Hole in the exhaust, tyres too soft, added a top box (if that's possible), dodgy choke (if it's the fuel injected type that still has a cable choke).
____________________
Blackmail is a nasty word........but not as nasty as phlegm!
XT1200Z and a DR350 in bits
 Back to top
View user's profile Send private message You must be logged in to rate posts

Chalky.
World Chat Champion



Joined: 30 Jun 2010
Karma :

PostPosted: 10:39 - 10 Feb 2011    Post subject: Reply with quote

Did you do anything to it just before it dropped?
 Back to top
View user's profile Send private message You must be logged in to rate posts

MarkJ
World Chat Champion



Joined: 11 Apr 2006
Karma :

PostPosted: 12:02 - 10 Feb 2011    Post subject: Reply with quote

Brakes binding?
 Back to top
View user's profile Send private message You must be logged in to rate posts

RichieZX6R
Nearly there...



Joined: 15 Jan 2009
Karma :

PostPosted: 12:19 - 10 Feb 2011    Post subject: Reply with quote

is the idle the same as before? If it has a rev counter that is!
____________________
Current: Kawazaki ZX6R 51
Past: Kawazaki ZX6R 96 - Honda CBR 600F4 05 - Dragstar 125 02 - Honda CB 400 SF 94 - Honda NSR 125 51 - Gilera Runner XV125 04
 Back to top
View user's profile Send private message Send e-mail You must be logged in to rate posts

calyx
World Chat Champion



Joined: 11 Dec 2008
Karma :

PostPosted: 13:22 - 10 Feb 2011    Post subject: Reply with quote

RichieCBR wrote:
is the idle the same as before? If it has a rev counter that is!


Yes, it has a rev counter. Idle is the same as before. 2k with auto choke. 1.6k without.

MarkJ wrote:
Brakes binding?


Tyres roll freely.

Chalky. wrote:
Did you do anything to it just before it dropped?


No I didn't. 2 Months ago I dropped the bike on its left side. It was fine since last week.

Ingah wrote:
Slow leak - check rubbers and fuel connections?


I'll check those connections if the feckin rain decides to stop at some point. Laughing

yen_powell wrote:
Filthy air filter? Hole in the exhaust, tyres too soft, added a top box (if that's possible), dodgy choke (if it's the fuel injected type that still has a cable choke).


Exhaust is good. Air filter is 3 months old. Checked the tyre pressure yesterday, it was ok. Choke is auto and it works ok. (Idle rpm is the same as before)


Thanks for the advice guys. I'll check every single connection now. Exhaust, fuel line, petrol tank etc..
____________________
Boris - London
 Back to top
View user's profile Send private message You must be logged in to rate posts

calyx
World Chat Champion



Joined: 11 Dec 2008
Karma :

PostPosted: 17:41 - 14 Feb 2011    Post subject: Reply with quote

The weather was decent today so I stripped the bike down. But I couldn't find any leaks. Sad Ran the engine for 30 minutes, sniffed every single connection like a police dog. No joy...
Exhaust is good, air filtre is good, brakes are fine, tyre pressure 30 and 40psi.

Any advice?
____________________
Boris - London
 Back to top
View user's profile Send private message You must be logged in to rate posts
N cee thirty This post is not being displayed because the poster is banned. Unhide this post / all posts.

Adam.I
World Chat Champion



Joined: 23 Jun 2004
Karma :

PostPosted: 17:53 - 14 Feb 2011    Post subject: Reply with quote

Assuming you use a full 13 litres and petrol is costing you £1.25 (filling the tank costing around £16.25), you should be getting around 200 miles if you say your MPG is 70. Now it is only 35 MPG, which is 100 miles. Does that sound about right, Caylx?
____________________
Veni Vidi Vici
 Back to top
View user's profile Send private message Send e-mail You must be logged in to rate posts

calyx
World Chat Champion



Joined: 11 Dec 2008
Karma :

PostPosted: 17:55 - 14 Feb 2011    Post subject: Reply with quote

Adam.I wrote:
Assuming you use a full 13 litres and petrol is costing you £1.25, you should be getting around 200 miles if you say your MPG is 70. Now it is only 35 MPG, which is 100 miles. Does that sound about right, Caylx?


Last time I filled up I got 95 miles. I normally get around 180-200.
____________________
Boris - London
 Back to top
View user's profile Send private message You must be logged in to rate posts

Adam.I
World Chat Champion



Joined: 23 Jun 2004
Karma :

PostPosted: 17:56 - 14 Feb 2011    Post subject: Reply with quote

I do not think it will be fuel prices though, especially since it only started a week ago. Unless he were buying fuel at 70p per litre, in which, can I have some!?
____________________
Veni Vidi Vici
 Back to top
View user's profile Send private message Send e-mail You must be logged in to rate posts

Adam.I
World Chat Champion



Joined: 23 Jun 2004
Karma :

PostPosted: 17:58 - 14 Feb 2011    Post subject: Reply with quote

And roughly how much did it cost you when you last filled your tank?
____________________
Veni Vidi Vici
 Back to top
View user's profile Send private message Send e-mail You must be logged in to rate posts

iooi
Super Spammer



Joined: 14 Jan 2007
Karma :

PostPosted: 18:01 - 14 Feb 2011    Post subject: Reply with quote

Faulty o2 sensor in the exhaust Thumbs Up

Had a few Versys riders who have encountered the same MPG dropping like a stone. Replacing the sensor has cured the issue.

Could be its just fouled up.

I have noticed that not only bike, but car is also returning less mpg at the moment. Wondering if oil co's have been messing with the petrol and reduced its calorific value.......
____________________
Just because my bike was A DIVVY, does not mean i am......
 Back to top
View user's profile Send private message You must be logged in to rate posts

calyx
World Chat Champion



Joined: 11 Dec 2008
Karma :

PostPosted: 10:20 - 15 Feb 2011    Post subject: Reply with quote

iooi wrote:
Faulty o2 sensor in the exhaust Thumbs Up

Had a few Versys riders who have encountered the same MPG dropping like a stone. Replacing the sensor has cured the issue.
Could be its just fouled up.


This makes a lot of sense as I get consistent 35mpg. I believe the problem is electrical.
O2 sensors cost like £35 pounds.
Is there a way to tell it is defected? Rather than buying/trying one Very Happy
____________________
Boris - London
 Back to top
View user's profile Send private message You must be logged in to rate posts

calyx
World Chat Champion



Joined: 11 Dec 2008
Karma :

PostPosted: 05:38 - 17 Feb 2011    Post subject: Reply with quote

It's got back to normal now. 3.9 litres / 64 miles (gps miles)
Only thing I changed is filling up at BP instead of Shell.
____________________
Boris - London
 Back to top
View user's profile Send private message You must be logged in to rate posts

cb1rocket
World Chat Champion



Joined: 30 Jan 2010
Karma :

PostPosted: 14:39 - 17 Feb 2011    Post subject: Reply with quote

crap fuel then.........tesco have done it at one point.
 Back to top
View user's profile Send private message You must be logged in to rate posts

calyx
World Chat Champion



Joined: 11 Dec 2008
Karma :

PostPosted: 15:48 - 25 Feb 2011    Post subject: Reply with quote

More updates;

The problem occurred again so I unplugged the oxygen sensor. Went for a 40 mile ride (30-50-70mph roads). Voila! Back to 70mpg.

I think it (used to) does this when I do longer journeys.

Now I have a new problem. The dashboard is lit up like a Christmas tree!
Should I buy a new oxygen sensor btw?
____________________
Boris - London
 Back to top
View user's profile Send private message You must be logged in to rate posts

Chalky.
World Chat Champion



Joined: 30 Jun 2010
Karma :

PostPosted: 15:51 - 25 Feb 2011    Post subject: Reply with quote

Yes, buy a new one.
 Back to top
View user's profile Send private message You must be logged in to rate posts

Kickstart
The Oracle



Joined: 04 Feb 2002
Karma :

PostPosted: 15:52 - 25 Feb 2011    Post subject: Reply with quote

Hi

Oxygen sensors can normally be tested with a multimeter, but normally an old style one with a needle. Connect the meter over the sensor in voltage mode. A healthy sensor should vary about a point, while sick ones normally sit bang on a single voltage (this is why you want a needle type multimeter as it makes it easier to see the deflection).

All the best

Keith
____________________
Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing
 Back to top
View user's profile Send private message Send e-mail You must be logged in to rate posts

Adam.I
World Chat Champion



Joined: 23 Jun 2004
Karma :

PostPosted: 15:59 - 25 Feb 2011    Post subject: Reply with quote

I have just had the same problem. Filled up at BP and did several journeys of under a mile for a few weeks. Managed to get about 70 miles. Filled up at Shell and did a 110 mile journey and still have two fifths left.
____________________
Veni Vidi Vici
 Back to top
View user's profile Send private message Send e-mail You must be logged in to rate posts

calyx
World Chat Champion



Joined: 11 Dec 2008
Karma :

PostPosted: 04:40 - 11 Mar 2011    Post subject: Reply with quote

Same problem again. Evil or Very Mad
It was back to 70mpg for 100ish miles than got back to 35mpg again.

So far I have;

-sniffed/checked connections
-checked the exhaust
-unplugged the O2 sensor

Can it be fuel relay or something like that?
____________________
Boris - London
 Back to top
View user's profile Send private message You must be logged in to rate posts
Vincent This post is not being displayed because the poster is banned. Unhide this post / all posts.
Old Thread Alert!

The last post was made 13 years, 21 days ago. Instead of replying here, would creating a new thread be more useful?
  Display posts from previous:   
This page may contain affiliate links, which means we may earn a small commission if a visitor clicks through and makes a purchase. By clicking on an affiliate link, you accept that third-party cookies will be set.

Post new topic   Reply to topic    Bike Chat Forums Index -> The Workshop All times are GMT + 1 Hour
Goto page 1, 2  Next
Page 1 of 2

 
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You cannot download files in this forum

Read the Terms of Use! - Powered by phpBB © phpBB Group
 

Debug Mode: ON - Server: birks (www) - Page Generation Time: 0.08 Sec - Server Load: 0.18 - MySQL Queries: 18 - Page Size: 132.81 Kb