Hey all .
I`m having problems with really high fuel consumption . Can anyone give me some Ideas to check ? I was getting up near 200 mile per tank and i`m currently getting around 130 . Theres no leak that I can see or smell . I`ve had the carbs off for a clean and set them up (not synced them as yet as i have no guage) its a 1990 and the pilot screws were open at almost 4 turns out . I`ve put them back to stock at 2 turns out , theres a bit of a flat spot now at 60 ish mph but i`ll open them up a little but more to get rid of that . Any help will be most appreciated , its costing me a fortune at the min !
Cheers
Dave
its possible that the o,rings on the needle seats under the floats are perished and letting fuel past, next time you have the carbs off, with the float bowls off, leave the carbs upside down and blow into the fuel inlet tube, if its the o,rings not sealing you should be able to hear air
Thanks for that , The other thing I neglected to do was check the float height thinking about it . I`ll get them off this avo and check them .
Cheers , anything else I can check ?
cant think of anything else at this late hour :shout: but will post up if i do,, float heights being spot on make a big difference to consumption and running better, ,
I use to get 50mpg, then I put UNI pods and a Suppertrapp on, more like 43/45mpg. Remember to turn the choke off, that will kill your mileage.
Cheers monkey; I always kill the choke within prolly 30 secs . She doesnt like to run too long on it anyway .
I pulled the carbs off again today and they were covered in all manner of gunk .
These are the 2 I haven`t worked on yet :
(http://img.photobucket.com/albums/v474/pinkfloyd81/P2260036_zps24f744df.jpg)
These are the 2 i`ve finished I sprayed the tops black:
(http://img.photobucket.com/albums/v474/pinkfloyd81/P2260032_zpsadaf3ac7.jpg)
I`m sure they were working at they`re best looking like that especially the chokes , I`ll do the other 2 tomorrow and see what happens .
The floats in the 2 i`ve worked on were 2mm out on the float height ! both were around 20mm and should be 22.3mm
How do your plugs look?
Quote from: Pat Conlon on February 25, 2013, 10:51:11 AM
How do your plugs look?
They look ok , little bit sooty maybe but nothing too bad . They are prolly pretty old
(http://img.photobucket.com/albums/v474/pinkfloyd81/P2260047_zpsd46c82cb.jpg)
They look a bit rich but not too bad. On the factory carb settings, my plugs were white.
Set your floats then get your carbs sync'ed. The proper sync. makes a big difference.
Run a couple of tanks thru, and see where you're at.... Let us know how you are doing.
Will do thanks mate.
I made a manometer last year but it wasn`t that great because I didnt have anything to reduce the airflow enough to get a settled reading . I`ve ordered some tap valves now so I should be able to get them sync`d up in the next few days . Will be interesting to see how far out they are as they have definately been "fiddled" with .
Quote from: fj12_rider on February 25, 2013, 10:47:37 AM
(http://img.photobucket.com/albums/v474/pinkfloyd81/P2260032_zpsadaf3ac7.jpg)
I see the spring for the sync adjuster is not in the proper position on this set of carbs. It is trapped around the flange where it should just be under the flange applying linkage/sync pressure to the screw.
Randy - RPM
Quote from: Pat Conlon on February 25, 2013, 11:33:00 AM
They look a bit rich but not too bad. On the factory carb settings, my plugs were white.
Set your floats then get your carbs sync'ed. The proper sync. makes a big difference.
Run a couple of tanks thru, and see where you're at.... Let us know how you are doing.
+1
When things are right, they're whiter than many people would expect, but that assumes you ran the bike long enough for them to burn clean after using the choke to start it.
Quote from: fj12_rider on February 25, 2013, 10:47:37 AM
Cheers monkey; I always kill the choke within prolly 30 secs . She doesnt like to run too long on it anyway .
Betcha things are richer than they need to be then, unless you live in some strange portion of the UK that I'm unfamiliar with. Takes a bit of time to get things warm enough to have decent throttle response without the choke... hopefully not >15min, like the wife's VF was on stock settings (since fixed, obv), but a few minutes of riding at least. Unless you're saying it idles okay without the choke but still has some fluffiness in the throttle.
(Sorry about posting twice, trying a different format to read things in.)
Quote from: racerrad8 on February 25, 2013, 03:20:53 PM
Quote from: fj12_rider on February 25, 2013, 10:47:37 AM
(http://img.photobucket.com/albums/v474/pinkfloyd81/P2260032_zpsadaf3ac7.jpg)
I see the spring for the sync adjuster is not in the proper position on this set of carbs. It is trapped around the flange where it should just be under the flange applying linkage/sync pressure to the screw.
Randy - RPM
They aren't put together just pushed them together for the photo :-)
Andy : the last time it was run was litterally a couple secs to get it out of the shed on choke so its a bad example really , I'll show again when I've run it for a bit
So .... Carbs cleaned and adjusted , Refitted . Valve clearances adjusted had to change the shims in 6 , will sync the carbs up tomorrow and then run a couple of tanks of fuel through it and see what she give me. It SHOULD now be the best I`m going to get from it anyway so there isn`t a lot else I can do , so fingers crossed she`ll be all good now . The throttle response is way way better thanks to the new shims anyway .
well , you just had the carbs done and it runs real good now . sooo maybe this is a right wrist problem :sarcastic:
Quote from: Mark Olson on February 28, 2013, 10:56:19 AM
well , you just had the carbs done and it runs real good now . sooo maybe this is a right wrist problem :sarcastic:
lol.... naa, I`ve been told I ride like an old woman ...lol .
Quote from: fj12_rider on February 28, 2013, 11:17:08 AM
Quote from: Mark Olson on February 28, 2013, 10:56:19 AM
well , you just had the carbs done and it runs real good now . sooo maybe this is a right wrist problem :sarcastic:
lol.... naa, I`ve been told I ride like an old woman ...lol .
An old woman used to be a young girl and never forgets it either.
KOokaloo! (it makes life worth living :good2:)
Problem Solved ! Just got 75 miles out of a tenner (£10) So thats much better than I was getting !!
Quote from: fj12_rider on February 25, 2013, 06:12:15 AM
Hey all .
I`m having problems with really high fuel consumption . Can anyone give me some Ideas to check ? I was getting up near 200 mile per tank and i`m currently getting around 130 . Theres no leak that I can see or smell . I`ve had the carbs off for a clean and set them up (not synced them as yet as i have no guage) its a 1990 and the pilot screws were open at almost 4 turns out . I`ve put them back to stock at 2 turns out , theres a bit of a flat spot now at 60 ish mph but i`ll open them up a little but more to get rid of that . Any help will be most appreciated , its costing me a fortune at the min !
Cheers
Dave
I have not hat this problem on my FJ, but I did have it on my Harley Road King. Mileage dropped precipitously from about 45 to about 30.
All I did was soak the airfilter in soapy water (yes, even though it's paper) and dry it and, back up to about 45 mpg!
B