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  #1  
Old 6th January 2019, 05:23 PM
Johny14586 Johny14586 is offline
Wobbling Fledgling
 
Biker.ie Member No. 37268
24 posts since May 2017
Motorbike: Honda cbr400 Honda shadow
Default High fuel consumption

I've a 2003 honda shadow 600 and its drinking juice. I went for a spin yesteday morning covering nearly 50 miles and it dam near emptied the tank. Also when the bike is cold it misfires under acceleration, but once it warms up it runs like a dream.

Anyone here to point me in the right direction on what could be causing this???
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  #2  
Old 6th January 2019, 07:07 PM
proto proto is offline
WSB Contender
 
Biker.ie Member No. 25910
575 posts since Apr 2011
Motorbike: CBR1100XX3, CBR900RRW
Default Re: High fuel consumption

Ever had the valves checked? Carbs or fuel injected?
Plugs and airfilter OK?
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  #3  
Old 6th January 2019, 07:27 PM
Phatty McFatt
Default Re: High fuel consumption

We usually get bitten in the arse by the simple things we forget to look at. Have you looked at your idle speed screw? Good few pranksters messing with them, even kids. To me it sounds like it. Start your engine, locate the screw and see how low you can go without stalling.
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  #4  
Old 6th January 2019, 07:59 PM
Johny14586 Johny14586 is offline
Wobbling Fledgling
Original Poster of This Thread Topic Starter
 
Biker.ie Member No. 37268
24 posts since May 2017
Motorbike: Honda cbr400 Honda shadow
Default Re: High fuel consumption

Thanks for the info. The bike was serviced recently so it say the plugs and filter are fine. I'll have a look at the screw and see what its like.
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  #5  
Old 6th January 2019, 08:07 PM
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SoulX SoulX is offline
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Biker.ie Member No. 24081 from Near Wild Heaven
8,014 posts since Sep 2010
Motorbike: Chainsaw/bike hybrid
Modifications: White Wall tyre
Default Re: High fuel consumption

Take out the plugs and check the colour.They should be the colour of milk chocolate.Dark means its running rich(too much fuel)light means running lean(not enough fuel)Also have a look at the air filter,this time of year you can get rodents nesting in there causing blockage and restricting air-flow.
All this is assuming you don't have a leak
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  #6  
Old 6th January 2019, 08:18 PM
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Gixxer Gixxer is offline
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Biker.ie Member No. 19392
13,002 posts since Nov 2009
Motorbike: NSU Quickly
Modifications: Lobotomy
Default Re: High fuel consumption

Originally Posted by Phatty McFatt
We usually get bitten in the arse by the simple things we forget to look at. Have you looked at your idle speed screw? Good few pranksters messing with them, even kids. To me it sounds like it. Start your engine, locate the screw and see how low you can go without stalling.


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  #7  
Old 6th January 2019, 08:56 PM
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manbearpig manbearpig is offline
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Biker.ie Member No. 21867 from Dublin
1,545 posts since May 2010
Motorbike: giant mtb
Modifications: front disc brakes
Default Re: High fuel consumption

Originally Posted by Gixxer


Very confused by this myself!
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  #8  
Old 6th January 2019, 11:24 PM
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joe williams joe williams is offline
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Biker.ie Member No. 23271 from tipperary
815 posts since Aug 2010
Motorbike: zx6r.cr 500sm. ktm950 sm.
Modifications: black duct tape
Default Re: High fuel consumption

Are you turning off the choke ?
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  #9  
Old 6th January 2019, 11:54 PM
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Frankkilty Frankkilty is offline
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Biker.ie Member No. 21821 from Dublin
2,915 posts since May 2010
Motorbike: r1200 GS
Modifications: A hand that waves!
Default Re: High fuel consumption

Originally Posted by manbearpig
Very confused by this myself!
Donít be.
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  #10  
Old 7th January 2019, 06:59 AM
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allsorts&oddjobs allsorts&oddjobs is offline
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Biker.ie Member No. 9980 from west limerick
8,724 posts since May 2008
Motorbike: Heaps, in both senses
Modifications: Tyres, when necessary on
Default Re: High fuel consumption

Check that your choke is closing properly, check it the carb not just at the lever, also see if there is petrol leaking down throughthe carbs by checking your oil level and you might also smell petrol in it, if so the needle in the carbs isnt seating properly allowing leakdown.
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  #11  
Old 7th January 2019, 12:27 PM
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Simba Simba is offline
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Biker.ie Member No. 4153 from Meath
579 posts since Dec 2006
Motorbike: sold to feed dogs
Modifications: Shoe leather
Default Re: High fuel consumption

Had a slimier problem with a Triumph tiger, turned out to be the carb, needed rebuild
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  #12  
Old 7th January 2019, 01:27 PM
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chopper chopper is offline
vintage biatch
 
Biker.ie Member No. 1841 from meath
53,839 posts since May 2005
My Motorcycle Pics Motorbike: jap brit and euro
Modifications: mud
Default Re: High fuel consumption

is there black smoke when you rev it ?
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  #13  
Old 7th January 2019, 08:16 PM
Johny14586 Johny14586 is offline
Wobbling Fledgling
Original Poster of This Thread Topic Starter
 
Biker.ie Member No. 37268
24 posts since May 2017
Motorbike: Honda cbr400 Honda shadow
Default Re: High fuel consumption

Thanks for the help folks. No smoke when reving, no leaks. Id say it might be the carb as the bike was in my fathers shed for nearly a year before I got it 2 weeks ago.
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  #14  
Old 7th January 2019, 10:39 PM
squag1 squag1 is offline
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Biker.ie Member No. 7498
190 posts since Dec 2007
Motorbike: Honda/BMW
Modifications: wheels
Default Re: High fuel consumption

Air filter
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  #15  
Old 7th January 2019, 11:40 PM
seano seano is offline
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Biker.ie Member No. 38635
76 posts since Oct 2018
Motorbike: Triumph Tiger 800
Modifications: Leovince,arrow map
Default Re: High fuel consumption

As others have said clean the carb, needle and seat is probably sticking from being laid up and bike running rich and even pouring out of the overflow. That be my bet anyway.
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  #16  
Old 8th January 2019, 06:47 PM
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ENGLISH ENGLISH is offline
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Biker.ie Member No. 8707 from Kill. Co.Kildare
781 posts since Mar 2008
Motorbike: Constantly changing
Modifications: Always standard
Default Re: High fuel consumption

A little too much Christmas pudding perhaps ?
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  #17  
Old 8th January 2019, 06:53 PM
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Admin Admin is offline
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Biker.ie Member No. 1 from Briarcliff Manor
34,151 posts since May 2005
My Motorcycle Pics Motorbike: Royal Enfield 350
Modifications: nitrous oxide
Default Re: High fuel consumption

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  #18  
Old 8th January 2019, 10:18 PM
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nednedned nednedned is offline
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Biker.ie Member No. 5106 from Dubzland
2,375 posts since Apr 2007
Motorbike: BANDIT 600 x2
Modifications: Air hornes-move cager
Default Re: High fuel consumption

Do you juice up at the same petrol station.
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