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Motorcycle cold weather (sub zero)

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MarJay
But it's British!



Joined: 15 Sep 2003
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PostPosted: 11:02 - 01 Dec 2017    Post subject: Reply with quote

https://vignette.wikia.nocookie.net/mortalkombat/images/e/e6/Subzero_wins_mk2.jpg/revision/latest?cb=20120919134536&path-prefix=es
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dn38416
Nitrous Nuisance



Joined: 17 Aug 2013
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PostPosted: 12:49 - 02 Dec 2017    Post subject: Reply with quote

I recently had to start parking my bike on the street and everything was getting screwed up, so i packed it in and tried switching to bicycle (shit). My commute has come down to 7 miles of inner city filtering which can't be doing the bike/battery much good*.

Showing my ignorance here, but on old diesel engine trucks, like in the 60s/70s didn't drivers have to light fires under them to get them started in the winter? And now they have glo-plugs. Would that kind of thing be any use on a bike? I spose it would heat u the air in the carbs to make it less dense in oxygen. I am bringing my GPZ back out now but alive to the fact that i'll probably be push starting it 3 days out of 5.


*(side question: is it the distance or acceleration that charges the battery)
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Tankie
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Joined: 24 Feb 2017
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PostPosted: 13:13 - 02 Dec 2017    Post subject: Reply with quote

Back then oil technology was still poor and oil was very thick when cold, so the best thing for a cold start is good quality oil of the correct grade / viscosity and a battery which has a good performance, not some tired old relic that has passed it's best
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Pete.
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Joined: 22 Aug 2006
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PostPosted: 16:33 - 02 Dec 2017    Post subject: Reply with quote

dn38416 wrote:
I recently had to start parking my bike on the street and everything was getting screwed up, so i packed it in and tried switching to bicycle (shit). My commute has come down to 7 miles of inner city filtering which can't be doing the bike/battery much good*.

Showing my ignorance here, but on old diesel engine trucks, like in the 60s/70s didn't drivers have to light fires under them to get them started in the winter? And now they have glo-plugs. Would that kind of thing be any use on a bike? I spose it would heat u the air in the carbs to make it less dense in oxygen. I am bringing my GPZ back out now but alive to the fact that i'll probably be push starting it 3 days out of 5.


*(side question: is it the distance or acceleration that charges the battery)

Petrol doesn't freeze at UK temps. You need to get down to minus 40 ish.

'Lighting a fire' under diesel tanks was to prevent it separating or 'waxing' though it had to be bloody cold for even that. At my dad's works years ago they had large candles that they lit and put under the buses to prevent this. Nowadays they have heaters.

Lighting a fire under your petrol tank is not recommended TBH.
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ThatDippyTwat
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Joined: 07 Aug 2016
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PostPosted: 21:37 - 02 Dec 2017    Post subject: Reply with quote

The only place I've seen a fire lit to start something is in Siberia, although I imagine places in CAnada/Alaska do similar as well.

Mate sent me a vid of a subbie at his plant lighting one under a bulldozer that wasn't used very often. It was stupidly cold though, -25, -30ish from memory.
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Ted
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Joined: 26 Mar 2006
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PostPosted: 10:51 - 03 Dec 2017    Post subject: Reply with quote

The diesel is more refined these days, and we have winter blends/additives to reduce waxing at UK winter temps.

As said this won't effect petrol.
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Tankie
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Joined: 24 Feb 2017
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PostPosted: 11:00 - 03 Dec 2017    Post subject: Reply with quote

Ted wrote:
The diesel is more refined these days, and we have winter blends/additives to reduce waxing at UK winter temps.

As said this won't effect petrol.

That shite they sell as "diesel fuel is nothing like the Gas oil sold over the channel,That's proper diesel fuel
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CivilDrone
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Joined: 09 Jun 2017
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PostPosted: 07:00 - 04 Dec 2017    Post subject: Reply with quote

Seems like flooding is/was the cause
Slightly confused about 2 things as well
Starts on a full choke with a little throttle, however throttle isnt catching straight away, assume there isnt enough petrol compared to warmed up bike
Also if i leave it on full choke it will warm up and say 30 seconds later it will start seize, have to gradually lower the choke half way
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Pete.
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Joined: 22 Aug 2006
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PostPosted: 21:16 - 04 Dec 2017    Post subject: Reply with quote

CivilDrone wrote:
Seems like flooding is/was the cause
Slightly confused about 2 things as well
Starts on a full choke with a little throttle, however throttle isnt catching straight away, assume there isnt enough petrol compared to warmed up bike
Also if i leave it on full choke it will warm up and say 30 seconds later it will start seize, have to gradually lower the choke half way


Yep that's normal. When the engine is stone cold you need full choke to deliver enough fuel for it to run. Since it needs no choke to run when it's up to temperature it stands to reason that it will require less and less as it warms up.

Most bikes you can set off then turn the choke off almost right away. The throttle response might be a bit wooly whilst it warms up but that shouldn't take long.
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ADSrox0r
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Joined: 23 Oct 2012
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PostPosted: 08:53 - 05 Dec 2017    Post subject: Reply with quote

Pete. wrote:

Most bikes you can set off then turn the choke off almost right away. The throttle response might be a bit wooly whilst it warms up but that shouldn't take long.


Aye, unless you have a wax idle controlled fast idle. VFR has one and if you pull away with the valve still pulling it'll give you a nasty jolt if you hit a junction before it comes down. Knew a chap that stacked a new bike into a parked car because of that.
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Old Thread Alert!

The last post was made 6 years, 115 days ago. Instead of replying here, would creating a new thread be more useful?
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