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CivilDrone |
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CivilDrone Two Stroke Sniffer
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Ted |
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Ted World Chat Champion
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Posted: 07:31 - 29 Nov 2017 Post subject: |
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When did the bike last have a service?
Is it stored outside? ____________________ '07 Honda CBF500 / '93 Vauxhall Astra (www.fb.com/2wdOffRoader) / '04 Vauxhall Movano
Projects: '81 Honda CX500 x2 / '85 Land Rover One-Ten / ...plus many horticultural things.
||| Bike Test: DAS: PASSED 13/02/2009 ||| Car Test: PASSED 22/05/2005 ||| |
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BTTD |
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BTTD World Chat Champion
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AldridgePrior |
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AldridgePrior Banned
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colink98 |
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Rogerborg |
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Rogerborg nimbA
Joined: 26 Oct 2010 Karma :
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Posted: 10:32 - 29 Nov 2017 Post subject: |
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+1 to the implied advice above: do a basic service. Oil, filter, plugs, coolant.
Don't believe a damn thing in any service history, or what you were assured by the previous owner. You could have done the lot for less than the cost of an unnecessary new battery. ____________________ Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike |
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Hawkeye1250FA |
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Hawkeye1250FA World Chat Champion
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weasley |
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weasley World Chat Champion
Joined: 16 Oct 2010 Karma :
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Posted: 13:53 - 29 Nov 2017 Post subject: Re: Motorcycle cold weather (sub zero) |
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CivilDrone wrote: | My guess is that oil might get thicker once cold and would not go around. |
Oil does get thicker, yes, but it shouldn't get so thick it prevents the engine from cranking. A typical oil for this bike would be a 10W-40 - an oil like this has to pass a "cold cranking simulator" test at -25°C; it didn't get that cold.
However, an oil that has been used for a long time and not changed will thicken more than this - if it is really fubar then all bets are off. But even then, it ought to still crank, albeit slowly.
If it is literally not cranking at all, then it's a power supply issue (bad battery, bad earthing, bad wiring, bad starter motor, bad starter solenoid etc). ____________________
Yamaha XJ600 | Yamaha YZF600R Thundercat | KTM 990 SMT | BMW F900XR TE |
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CivilDrone |
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CivilDrone Two Stroke Sniffer
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Tdibs |
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Tdibs Traffic Copper
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Kawasaki Jimbo |
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Kawasaki Jimbo World Chat Champion
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NJD |
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NJD World Chat Champion
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CivilDrone |
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CivilDrone Two Stroke Sniffer
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Pete. |
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Pete. Super Spammer
Joined: 22 Aug 2006 Karma :
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Posted: 07:42 - 30 Nov 2017 Post subject: |
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If it starts once it should keep going. If it doesn't then it's not getting the fuel it needs for cold running.
As above full choke NO throttle and let it idle for a few moments. If it still does the same trick then the carbs need servicing.
Minus 2 is NO problem for petrol engines to start on choke, covered up or not. Oil might affect cranking if it was very heavy but if it starts once forget the oil as a likely cause. Same for the spark plugs though if they were very old it might have a general effect on the running and starting. ____________________ a.k.a 'Geri'
132.9mph off and walked away. Gear is good, gear is good, gear is very very good |
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colink98 |
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CivilDrone |
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CivilDrone Two Stroke Sniffer
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colink98 |
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wots |
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wots World Chat Champion
Joined: 30 Aug 2012 Karma :
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Posted: 11:53 - 30 Nov 2017 Post subject: |
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I find carb'd bikes in the cold are like women. You need to know what to do to get the best out of them, they can be good to go, or need a bit of special treatment to get them in the mood.
My previous carb'd fireblade 919, most of the year, no choke whatsoever. Any attempt to use any, would cause it to flood fairly quickly and then you'd need to sit and wait 15-20 minutes. When it got colder, I needed varying amounts of choke but rarely full. I'm a turn on and go type anyway, rather than leave standing, even in the coldest I could probably run choke free half a mile up the road.
Whereas other bikes have needed full choke, all year round and left on for longer.
Generally, as above, throttle is a bad thing and in fact until I've removed the choke I try and ride using the extra revs and saunter along until warmed up a little, then start to crack the throttle.
A good battery is essential this time of year too, even a cheaper replacement (rather than a good Motobatt for instance) will be better than one with already reduced life. Especially if you have to do a longer start. ____________________ Currently: Yamaha DT 125 LC2,Repsol Fireblade, and Bumblebee MSX 125 |
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weasley |
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weasley World Chat Champion
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Pete. |
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Pete. Super Spammer
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Itchy |
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Itchy Super Spammer
Joined: 07 Apr 2005 Karma :
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Posted: 20:12 - 30 Nov 2017 Post subject: |
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EFI bikes also have a fast run when you first start them up to warm them up.
My CBR doesn't have it as somebody remapped it so you have to give it some gas else it doesn't catch.
Has excellent fuel economy though due to the remap. ____________________ Spain 2008France 2007Big one 2009 We all die. The goal isn't to live forever, the goal is to create something that will. In the end, your life will flash before your eyes. Make sure it is worth watching. |
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wots |
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wots World Chat Champion
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Posted: 20:27 - 30 Nov 2017 Post subject: |
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As I said above, I'm a start and go type. On my CBR1000RR, that means nearly 30mph in 2nd on fast idle. Means a bit of clutch feathering until the revs start to drop. ____________________ Currently: Yamaha DT 125 LC2,Repsol Fireblade, and Bumblebee MSX 125 |
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Hong Kong Phooey |
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Hong Kong Phooey World Chat Champion
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colink98 |
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MCN |
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MCN Super Spammer
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Posted: 11:00 - 01 Dec 2017 Post subject: |
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Cold oil will not prevent an engine from turning over. A cold battery will not release as much power as fast as a battery at normal temperature though.
The only real issue with cold oil is cavitation where the oil is slow to flow and the pump cavitates (runs in a vacuum). That can lead to unlubricated parts. Advice then is to allow the engine time to get oil to remote parts before giving it the beans.
At least wait for the oil lamp to go off.
For cold starting full choke, crack the throttle open (just off the idle stop) and crank over until the engine starts.
It should run fine from there with maybe just small tweak of throttle.
The issue with cold starting is that fuel from the carb condenses on cold surfaces so less fuel than needed for combustion gets to the cylinder/s.
There is a precise amount of fuel to air mixture (ratio) required for proper combustion in any engine.
The choke reduces the amount of air (oxygen) so that increases the a,out of fuel to air. Which provides for the loses due to fuel condensing outside the cylinder.
As above, a properly serviced and adjusted engine will start easily in sub-zero temps. With modern fuels and electronic ignition they start even easier.
Sorry for going al Tef. ____________________ Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN.
Last edited by MCN on 11:02 - 01 Dec 2017; edited 1 time in total |
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Old Thread Alert!
The last post was made 6 years, 147 days ago. Instead of replying here, would creating a new thread be more useful? |
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