Winter riding

Misha · 01-05-2017, 12:16 PM

I don't know why but my bike wont work in cold weather. It's in a garage, where its sort of warm, it starts up no problem, BUT, when i take it out it starts idling bad, chokes and dies, then it won't start until I get it inside for some time. I tried riding it and it chokes again, probably bad electronics.

I fitted a new NGK spark plug, but it idles and goes WORSE....I'm confused

Anyone else with same problems in the cold?

**JerryHawk250** · 01-05-2017, 01:34 PM

we need a little more information. What type or brand of bike? Does the carburetor have a manual choke or auto choke. What cc motor? Air cooled or water cooled?

Misha · 01-05-2017, 01:48 PM

Quote:

Originally Posted by JerryHawk250

we need a little more information. What type or brand of bike? Does the carburetor have a manual choke or auto choke. What cc motor? Air cooled or water cooled?

It's a Jonway ST25D, 230cc, manual choke, water cooled.

Bruce's · 01-05-2017, 02:37 PM

How is your fuel ?

**JerryHawk250** · 01-05-2017, 02:57 PM

Quote:

Originally Posted by Misha

It's a Jonway ST25D, 230cc, manual choke, water cooled.

So being that it is a manual choke that rules out the Auto choke not working. When you say cold, How cold are we talking about? Only thing I can think of so far is that the thermostat is stuck and the engine is not maintaining a proper running temp when in the cold. I'll look into it more and see if I can come up with anything.

Misha · 01-05-2017, 08:49 PM

anything under 5c, maybe it sucks in too much air somehow? But why in the cold only...

Misha · 01-05-2017, 08:50 PM

Quote:

Originally Posted by Bruce's

How is your fuel ?

fuel is good, just changed the filter too, i use 95oct.

pistolclass · 01-05-2017, 10:00 PM

Check also to see if you have an air leak, like Carb to intake manifold.

**JerryHawk250** · 01-06-2017, 07:50 AM

Quote:

Originally Posted by Misha

anything under 5c, maybe it sucks in too much air somehow? But why in the cold only...

If the thermostat is stuck in the open position the motor can't maintain the proper temperature to run with the choke off. Does it run if you put it at half choke? Something else you may want to check is valve clearance. Like Pistolclass stated. Check for air leaks too.

zackattack91 · 01-06-2017, 10:15 AM

Possibly the radiator is clogged so the water isn't cooling the engine when you drive and the temps go up. When it's idling in your garage it's not gonna get as hot as it is when your riding it.

Dakados · 01-10-2017, 01:42 PM

Definitely sounds like a tuning issue. An air leak would certainly cause this.

Changing the gaskets/seals between carb-intake & intake-block may cure this and should be a quick and inexpensive first step.

Clean or replace both the air / fuel filters if you haven't already.

Add about a tablespoon of gas line antifreeze to the fuel tank, this will not hurt the engine but will clear up any condensation that may have accumulated.

How long is the machine idling before you take it out?
While the carb is off for gasket/seal replacement, check that the choke butterfly and choke cable operate freely.
Please post if the problem is already fixed, also I'd love to see a picture of your machine

Regards,
Dak

01-05-2017, 12:16 PM	#1
Misha Join Date: Oct 2016 Location: Serbia, Europe Posts: 8	Winter riding I don't know why but my bike wont work in cold weather. It's in a garage, where its sort of warm, it starts up no problem, BUT, when i take it out it starts idling bad, chokes and dies, then it won't start until I get it inside for some time. I tried riding it and it chokes again, probably bad electronics. I fitted a new NGK spark plug, but it idles and goes WORSE....I'm confused Anyone else with same problems in the cold?
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01-05-2017, 01:34 PM	#2
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,552	we need a little more information. What type or brand of bike? Does the carburetor have a manual choke or auto choke. What cc motor? Air cooled or water cooled? __________________ 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel
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01-05-2017, 02:37 PM	#4
Bruce's Join Date: Apr 2015 Location: Sudbury ,Ontario Posts: 855	How is your fuel ?
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01-05-2017, 08:49 PM	#6
Misha Join Date: Oct 2016 Location: Serbia, Europe Posts: 8	anything under 5c, maybe it sucks in too much air somehow? But why in the cold only...
	0

01-05-2017, 10:00 PM	#8
pistolclass Join Date: Oct 2015 Location: connecticut Posts: 978	Check also to see if you have an air leak, like Carb to intake manifold.
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01-06-2017, 10:15 AM	#10
zackattack91 Join Date: Dec 2016 Location: New Jersey Posts: 86	Possibly the radiator is clogged so the water isn't cooling the engine when you drive and the temps go up. When it's idling in your garage it's not gonna get as hot as it is when your riding it.
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01-10-2017, 01:42 PM	#11
Dakados Join Date: Jan 2017 Location: Grande Cache, Alberta, Canada Posts: 42	Definitely sounds like a tuning issue. An air leak would certainly cause this. Changing the gaskets/seals between carb-intake & intake-block may cure this and should be a quick and inexpensive first step. Clean or replace both the air / fuel filters if you haven't already. Add about a tablespoon of gas line antifreeze to the fuel tank, this will not hurt the engine but will clear up any condensation that may have accumulated. How long is the machine idling before you take it out? While the carb is off for gasket/seal replacement, check that the choke butterfly and choke cable operate freely. Please post if the problem is already fixed, also I'd love to see a picture of your machine Regards, Dak
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