staffy
Junior Member
Posts: 92
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Post by staffy on Dec 13, 2006 9:43:46 GMT -5
I refilled the other day and i thought "golly gosh, that's a lot of fuel for such a short distance". I put in about 7.5 litres for a touch over 100km's. About 12 km's per litre i suppose. It's a stock bike with stock gearing but that seems a bit much. I was running regular unleaded (i know, bad boy) but i've just switched to 98 octane PULP. Hopefully that makes a difference.
It'd be interesting to see what figures other people get with their bikes in various different states of tune, so post em up.
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Post by tradrockrat on Dec 13, 2006 13:24:26 GMT -5
mine gets over 40 MPG, but it needs the minton mods - stutters pretty bad WFO
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Post by colinjay on Dec 13, 2006 16:49:54 GMT -5
Hi all,
On my normal ride to work, I average 18km/L (about 48mpg). The bike has a stock engine, carbie and airbox, custom header pipe with a Staintune Conti replica muffler. The bike is fitted with a small/low touring screen with 2" rise touring bars, Plus I and 6'4" tall and weigh in at about 120Kg full kitted for riding, so it is by no means aerodynamic. Running on std ULP, bike is actually running a bit rich, and one day I will sort out the jetting, and should get marginally better.
In the early 80's I competed in a fuel ecomonony run with my local vintage bike club. Over a 110Km run I manage 83mpg (about 30km/L). The winner,Bill, on a 1950's Ariel 500 single achieved 175mpg!! I had done the following to reduce fuel usage: In the carbie went 2 size down on the pilot jet and dropped the needle to its lowest setting(raised the clip to it highest position). cleaned the chain (non oring) and lightly oiled plus inflated the tyres to about 60psi. Cleaned the wheel bearings of grease and oiled them with light weight oil. Pryed the disc pad away from the discs at the start and didn't use them until I had to stop at the finish. Rode the entire distance at about 60kph at a near constant throttle with out lugging / loading the engine. Bill on his Ariel, rode the bike as it came out of the shed, rode at normal pace about 50 - 55 mph!
CJ
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Post by wotavidone on Dec 13, 2006 19:47:20 GMT -5
I reckon I'm getting close to 20 km per litre, or around 50 - 55 mpg. Funny thing is, as I went up in main jet size while trying to get the ol' girl to run nice, this got better, probably started out at around 17 km to the litre.
I have the standard air cleaner insert with the old standard foam all cleaned off and replaced with a tight fitting sock made from 12mm thick aircleaner foam I bought from the bike shop.
I oil it with engine oil, and its all in the standard air box, though I am now the proud owner of a can of spray on air cleaner oil.
Muffler is after market, but not real loud, so fairly well muffled.
Mick
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Post by milkman on Dec 13, 2006 22:58:43 GMT -5
I would get about 18-20km/l also, but thats in stop start with a cam that won't let me idle below 2000rpm. Onthe road, it would be the average 22-24ish. I have a stock pipe.
Not to open a pandorra's box as you say but, the story about the Ariel has me in agreeance on some maintenance issues.
I hate using the sticky chain lubes etc as all they seem to do is attract crud and flick it on my swing arm etc.
I'm more than happy to lightly oil a chain, bearing etc more often, than to chock it with something thicker (unless I know I'm out in the rain or adverse conditions for longer). More important to have a quality chain, bearing etc etc in the first place.
However, if your not into more regualr maintenance, sacrifice a bit of economy with heavier longer lasting lubricants. Then again, if I didn't like tinkering a bit, I wouldn't have an old bike!
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Post by miker on Dec 14, 2006 15:47:12 GMT -5
I reliably get 59-60mpg on my stock 78, mixed town/highway. I did go one step larger from stock on the main jet and raised the needle (lowered clip) one groove. Stock airbox/filter and one of those Dunstall copy glasspacks.
miker
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staffy
Junior Member
Posts: 92
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Post by staffy on Dec 14, 2006 20:53:18 GMT -5
Well it looks as though something may be amiss. My 12k's per litre seems pretty bad and i had an inkling that it would be the case. I've only had two tanks through since i bought it so it may get better with longer rides etc (i hope)
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Post by wotavidone on Dec 14, 2006 23:48:14 GMT -5
The other thing I forgot to mention - 17 tooth front, 42 tooth rear sprockets don't hurt either.
Not to mention the very high profile old style tread pattern dunlop on the back, which rolls at least 10 inches further per revolution than the old 100/18 that was on there when I bought the bike.
I am planning to do another GPS check for speed now that I have changed a few things, and I reckon I will see at least 100km/hr for 4000 rpm.
Must do at least a little bit for fuel economy.
Mick
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Post by tradrockrat on Dec 15, 2006 10:16:28 GMT -5
I have got to get off my butt and get a 17 front... but I want a spare carb first and money's getting tight right now...  (I'll survive - just pregnant doging a little  ) lol - I love the editing feature on this site - Too funny.  |
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Post by miker on Dec 15, 2006 16:04:57 GMT -5
Oh yeah, I'm 17/44... forgot that, must help a little.
miker
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