Stop-start engines in bikes, your thoughts?

[Ribenapigeon]

MCN article on future engine technology mentioned stop-start engines on bikes. I've never driven a car with stop-start but still in sceptical about them especially in bikes. What do folks think?

[matlow]

Works really well in cars, you can also control if it kicks in which helps. The downside for bikes is the added weight, an extra battery for a start....
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[monkeybiker]

Can't see the point on a bike as you don't tend to stop as much as a car would. You can switch the system off if needed.

I don't think I would want it as it's just another thing to go wrong.

[UrbanRacer]

[bugeye_bob]

[pinkyfloyd]

The way these things work is they turn the engine on when the driver of the car depresses the clutch. (at least some of them do.)

When I stop at lights my clutch is always in as I am in first gear. Dont fancy shifting into neutral every time just to save a tiny bit of petrol.
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[dydey90]

Don't Mazda have a system that tracks the position of the engine rotation so it can start it with next to no juice?

I once drove a fiesta that had stop/start and I never noticed until I parked up, since the hand brake had to be on.
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[wots]

Honda PCX 125 has it, works quite well actually. I rode home one for someone else. Cuts out when you come to a halt, as soon as you wind out the throttle off you go. Barely any lag.

I was impressed.
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Currently: Yamaha DT 125 LC2,Repsol Fireblade, and Bumblebee MSX 125

[sidewinder]

It's all good until the starter motor has enough
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[wots]

[Snorty]

Surely the only advantage is when you're stuck in traffic? Red lights too but they're never on for THAT long and on a bike you're at the front of the queue. I can't see the point.
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Current: Yamaha FZ1 '07 | GSXR 750 SRAD

Past: CB125TDC | TZR125 | GPZ500 | CBR600F3 | ZX9-R | GSXR1000 K4

[wots]

[barrkel]

[Baffler186]

I've driven a fair few 2014 cars, and I just can't connect to the new ones with their start/stop engines, button handbrakes, keyless entry, auto wipers. Even after driving one for 600 miles I still didn't get used to it fully. I could see the attraction for pure-bred commuter bikes, but for me it would be an extra that I would not want.
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Current: 2009 SV650 S, 1990 Kawasaki GT550
Previous: 2009 CBF125, 1998 GSF600, 2004 FZ6 Fazer, 1978 CB400a Hondamatic

[matlow]

[andyscooter]

i had one on the pcx that i had

it was great and didnt kick in until the engine was

a)warmed up
B) the battery had taken the charge it had lost from initial start up

honda used a brusless electric starter which used very little power
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[chris-red]

The added weight will probably counter any savings.
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[andyscooter]

cant see how any weight was added as starter was tiny and battery was same as my vespa one
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[Jim Mc]

Having driven two cars with it I find it utterly pointless

[iooi]

[G]

I'd hope they could use super capacitors or similar for the starting - which would actually probably improve normal battery life and don't weigh THAT much.
It's common for multi-drop van drivers to find they go through starter motors on a yearly basis, so can see a stop-start system would need a beefier one.
I've not driven one, but have driven in a stop-start fashion for fuel economy in the past. It can make a noticeable difference to fuel.

If I was looking after fuel, I'd prefer to see a hybrid with an electric motor that could power the bike to 35 or 45 - so around town you can use purely electric if you want.

The motor would also work as a starter motor and be liquid cooled from the bike.

[-Monty-]

My old PCX had it (incidentally the bike that Wots rode on his journey back home from my place). It was a cool gimmick when I first got it but after a while I just switched it off and never bothered with it. Honda claimed up to a 3% improvement on fuel consumption with the stop-start (presumably this figure will be in busy city traffic where the stop-start would be used a lot). On a bike that returns a minimum 90-100MPG, I don't really see the need for it.
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Past: [Honda PCX 125] [Yamaha RXS 100] [Honda CB 500] [Triumph Speed Four] [Honda ST1100 Pan European - Po-Po Edition]

[stevo as b4]

Yeah my dad's PCX has it, but as you say it's a 110mpg scoot anyway, so unless your in traffic all day long it's not going to save you a lot of fuel. I do switch off various vehicles that I'm driving when sat in long stationary queues anyway, or if I'm low on fuel and trying to coast as much as possible to get well out of town before filling up.

The Mazda system does not use the starter motor to re-start the engine. Instead it can determine which cylinder is trapped on the compression stroke, and it adds fuel and spark to ignite the compressed trapped charge that then starts the engine.

I like Mazda, they are using all this sky active technology, so that they don't have to use silly little downsized turbo engines with no character, and some of their petrol motors actually make power near the red-line and like being thrashed, unlike these Eco crappy boosty things!

[almostthere]

My VW polo stops everytime I get to a junction it's not meant to it just does won't be long before I smash the fuck out of it with a piece of 4x2, don't think I could get used to it on a bike either
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[The Shaggy D.A.]

Fucking annoying in a car, would not tolerate it on a bike.
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