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Post by matty on Apr 8, 2012 8:44:14 GMT
Ive just bought a Divvy 600 as a more economical way of getting around than my FZ1 and was wondering if anyone had hit upon any good ways to improve fuel economy? Obviously i know the control of my right hand is the biggest influencing factor, and assume the bike is freshly serviced and everything set up just right. With non-specific Divvy knowledge the best I've come up with is a larger front sprocket  |
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Post by m40man on Apr 8, 2012 10:47:17 GMT
Down from the FZ1, I'd guess you've gained economy enough  ! But I reckon the front sprocket will likely yield a little more. But why not change the rear instead, to one tooth smaller? The impact will be less on the final ratio, so a less obvious impact on acceleration & general performance, & you won't have to worry about clearance of the chain, like you would with a larger front. (I accept that replacing the front will be a bit cheaper.) |
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Post by CD on Apr 8, 2012 17:52:33 GMT
Low(er) revs do not necessarily mean less fuel consumption unless you are really low on the throttle read simply go slower. To put another way - an over-geared bike (or car) will use more fuel than one running with the correct gear ratios.
What you gain from reduced friction losses you will lose by running more often below the engine's most efficient revs range. Bike engines are built to rev slog them along and they waste fuel.
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Post by bobh on Apr 9, 2012 13:44:02 GMT
I have to say when I had my 600N I was tempted to up the gearing, but more to raise the stupidly low bottom gear than to improve economy in top.
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Post by CD on Apr 10, 2012 12:33:31 GMT
Mr Yam for some reason put a smaller front sprocket on the N. the lack of fairing cant make THAT much difference (can it?).
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Post by bobh on Apr 10, 2012 23:15:11 GMT
Mr Yam for some reason put a smaller front sprocket on the N. the lack of fairing cant make THAT much difference (can it?). From memory I think it was actually the same front (16T?) and 2 teeth up on the rear. But either way, it did feel undergeared. |
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Post by CD on Apr 11, 2012 8:29:23 GMT
Some say the 900 is under-geared (though I'm happy enough) so maybe the 600S is also undergeared. But generally with bike engines its better to under rather than over gear them. Divvies (being 8V lumps might fare better) but most dont have the torque to pull high ratios.
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Post by matty on Apr 12, 2012 7:58:04 GMT
Thats a fair point. Im guessing no one has gone into this deep enough to have any info on efficiency at different revs.
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Post by matty on Apr 12, 2012 8:06:44 GMT
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Post by CD on Apr 12, 2012 8:25:57 GMT
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Post by matty on Apr 12, 2012 20:42:41 GMT
I dont need encouraging  |
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Post by amorti on Apr 13, 2012 0:00:04 GMT
You can already expect an easy 55mpg, and a worked-for 65mpg. If you need more economy than that, frankly, you'd be better off with a 125. Or a small diesel car. Or moving closer to your job.
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Grumbleweed
Boy Racer
Grumbleweed, 2009 model XJ6S, brought new in 2010.
Posts: 229
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Post by Grumbleweed on Apr 13, 2012 18:24:09 GMT
You can already expect an easy 55mpg, and a worked-for 65mpg. If you need more economy than that, frankly, you'd be better off with a 125. Or a small diesel car. Or moving closer to your job. In my experience it was more like 48 mpg in normal use. Grum. |
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Post by CD on Apr 17, 2012 16:33:43 GMT
I would love to fit LPG just to avoid paying so much fuel tax. But the kits are not geared up for a bike & probably near-on impossible on an air cooled engine.  |
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Post by sledgegreen on Apr 17, 2012 19:36:32 GMT
Worn chains & sprockets waste energy, so a Scottoiler or similar should improve economy.
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Post by amorti on Apr 20, 2012 0:27:27 GMT
You can already expect an easy 55mpg, and a worked-for 65mpg. If you need more economy than that, frankly, you'd be better off with a 125. Or a small diesel car. Or moving closer to your job. In my experience it was more like 48 mpg in normal use. Grum. Are we talking about the old air cooled 600 here? I have a spreadsheet with 12k miles recorded, between 52-66mpg, average 56.1mpg. I rate that as pretty feckin good for fuel efficiency. |
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Grumbleweed
Boy Racer
Grumbleweed, 2009 model XJ6S, brought new in 2010.
Posts: 229
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Post by Grumbleweed on Apr 27, 2012 17:50:18 GMT
In my experience it was more like 48 mpg in normal use. Grum. Are we talking about the old air cooled 600 here? I have a spreadsheet with 12k miles recorded, between 52-66mpg, average 56.1mpg. I rate that as pretty feckin good for fuel efficiency. It was the old one (2001) I was thinking of. I don't have a spreadsheet but I never saw above 50 mpg. I didn't go everywhere flat out! Perhaps it being an import made a difference, you know, European petrol munching is worse than the UK. Or not. Grum. |
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Post by CD on May 2, 2012 20:25:41 GMT
Advancing the ignition and using posh petrol would increase combustion efficiency and reduce pence per mile. Does anyone know a way to move the ignition sensors on a Diversion.
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