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Bike won't start - choke?

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Chris_northants
Derestricted Danger



Joined: 06 May 2006
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PostPosted: 10:24 - 23 May 2006    Post subject: Bike won't start - choke? Reply with quote
After riding my bike to school for the first time today Ive now realised the bike won't start again, so Im going to have a bit of a problem when I try to get home..

I think Id accidently left the choke on a bit while riding and have flooded the engine?

As ive only started riding Im a bit unsure what to do, its a 4 stroke 125. Ive left the bike to cooldown and closed the choke.

What should I do to get it started?
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Walloper
Super Spammer



Joined: 24 Feb 2005
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PostPosted: 10:54 - 23 May 2006    Post subject: Reply with quote
Turn the choke OFF
Hold the throttle full open.
Crank the engine.

This is to blow the excess fuel out the cylinder.

Close the throttle.
Set the choke to start position 'full'.
Start as normal.


This should do it.
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doggone
World Chat Champion



Joined: 20 May 2004
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PostPosted: 11:04 - 23 May 2006    Post subject: Reply with quote
It might be OK after a few hours anyway - but what he said is the technique to use ^
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Chris_northants
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Joined: 06 May 2006
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PostPosted: 13:53 - 23 May 2006    Post subject: Reply with quote
when you say crank the engine, what do you mean, kickstart?
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Davo
Davo To The Rescue!



Joined: 05 Apr 2004
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PostPosted: 15:52 - 23 May 2006    Post subject: Reply with quote
Chris_northants wrote:
when you say crank the engine, what do you mean, kickstart?


Yes

To crank usually refers to turning the engine over using it's starter mechanism (kick start or starter motor)
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Walloper
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Joined: 24 Feb 2005
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PostPosted: 15:56 - 23 May 2006    Post subject: Reply with quote
Chris_northants wrote:
when you say crank the engine, what do you mean, kickstart?

Kickstart or (electric starter).
I should have said wound/turn the engine over sorry.

The choke on a bit shouldn't flood the engine. It will only cause lack of power due to over richness of the air fuel mixture. (Which is what the choke does to start a cold engine.) And cost you valuable pounds.

'Flooding' Is when you have tried to start a cold engine too often in a short interval which causes the resultant un-burned fuel to collect in the combustion space which inturn over riches the air fuel mixture delivered. Too much fuel and the spark can't ignite the vapour, as there is now not enough Oxygen to support combustion.

Switching off the choke and turning the crankshaft via starting system, making the piston move fresh air, through a fully opened throttle, in and out the cylinder should return the condition to normal without too much hassle.

Choke operation:
In a cold engine the fuel introduced to the cylinder can condense on cold inlet manifold and cylinder surfaces.
This makes the air-fuel mixture too weak to support combustion when the spark is offered to the mix near the end of compression.
To allow for this all engines employ a cold staring device to enrich the mixture during cold starts.
The choke restricts the amount of air and this increases the ratio of fuel to air.
The fuel condensing on cold surfaces is then compensated for to achieve a normal air-fuel mixture for combustion.
Once started the choke must be gradually moved to off as the engine warms up and runs smoothly. Which normally only needs a few minutes.
Modern fuel injection systems use a injector like valve to add more fuel for this same reason. These are controled by the ECU not your thumb. Thank you Jesus Laughing

Diesel engines have similar problems starting.
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Chris_northants
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Joined: 06 May 2006
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PostPosted: 21:20 - 23 May 2006    Post subject: Reply with quote
got it started, i was just being really newbish.

At some point I accidently turned the emergency stall button on. Hense why it wasn't starting.

thanks for the help anyway.
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h00dwink
World Chat Champion



Joined: 04 May 2006
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PostPosted: 01:15 - 24 May 2006    Post subject: Reply with quote
Walloper wrote:
Chris_northants wrote:
when you say crank the engine, what do you mean, kickstart?

Kickstart or (electric starter).
I should have said wound/turn the engine over sorry.

The choke on a bit shouldn't flood the engine. It will only cause lack of power due to over richness of the air fuel mixture. (Which is what the choke does to start a cold engine.) And cost you valuable pounds.

'Flooding' Is when you have tried to start a cold engine too often in a short interval which causes the resultant un-burned fuel to collect in the combustion space which inturn over riches the air fuel mixture delivered. Too much fuel and the spark can't ignite the vapour, as there is now not enough Oxygen to support combustion.

Switching off the choke and turning the crankshaft via starting system, making the piston move fresh air, through a fully opened throttle, in and out the cylinder should return the condition to normal without too much hassle.

Choke operation:
In a cold engine the fuel introduced to the cylinder can condense on cold inlet manifold and cylinder surfaces.
This makes the air-fuel mixture too weak to support combustion when the spark is offered to the mix near the end of compression.
To allow for this all engines employ a cold staring device to enrich the mixture during cold starts.
The choke restricts the amount of air and this increases the ratio of fuel to air.
The fuel condensing on cold surfaces is then compensated for to achieve a normal air-fuel mixture for combustion.
Once started the choke must be gradually moved to off as the engine warms up and runs smoothly. Which normally only needs a few minutes.
Modern fuel injection systems use a injector like valve to add more fuel for this same reason. These are controled by the ECU not your thumb. Thank you Jesus Laughing

Diesel engines have similar problems starting.


quite an interesting read, never bothered to look into what a choke's for, e-props for you Thumbs Up
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critical_technique
Nova Slayer



Joined: 08 Jan 2006
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PostPosted: 01:29 - 24 May 2006    Post subject: Reply with quote
i think this is why my speedfight wont start. takeing it to the garage tomoz hope they dont fleece me. im relaitve noob but i do know a thing or two. it just wonbnt flipin start the flipin piece of junk
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ZZR Girl
Trackday Trickster



Joined: 31 Jul 2005
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PostPosted: 18:40 - 24 May 2006    Post subject: Reply with quote
I have a similar problem although slightly different, in that it starts absolutely fine first time in the morning from cold with full choke, but after sitting 8 hours in the car park at work, when I go to go home (again giving it choke as it's been standing so long) it won't start first time. It takes about 3 pushes of the starter before it'll eventually take hold and splutter into life. What's going on here then?
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Walloper
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Joined: 24 Feb 2005
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PostPosted: 20:55 - 24 May 2006    Post subject: Reply with quote
ZZR Girl wrote:
I have a similar problem although slightly different, in that it starts absolutely fine first time in the morning from cold with full choke, but after sitting 8 hours in the car park at work, when I go to go home (again giving it choke as it's been standing so long) it won't start first time. It takes about 3 pushes of the starter before it'll eventually take hold and splutter into life. What's going on here then?


Ah haaaa... Idea

Have you tried to start after it's been stitting all day without using any choke?
I don't know how far your commute is, your engine may not be getting hot enuf or barely hot enough for complete atomisation of the fuel and you end up parking the bike with a slightly enriched charge of fuel and air.
Or maybe a spark plug/ignition fault.
For eliminatation purposes try to start without choke. See if it makes any diference.
I could be barking up the wrong tree too Very Happy
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ZRX61
Victor Meldrew



Joined: 05 Nov 2003
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PostPosted: 17:06 - 25 May 2006    Post subject: Reply with quote
Chris_northants wrote:
the emergency stall button

Thats a new name for it..... Rolling Eyes
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Jamie.
World Chat Champion



Joined: 27 Dec 2005
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PostPosted: 17:15 - 25 May 2006    Post subject: Reply with quote
I bet you around 75% of people would forget to press the Kill Switch in an actual emergency Laughing


EDIT: Just realized how random that comment was Wink
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McGee
O RLY?



Joined: 24 Jun 2005
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PostPosted: 17:51 - 25 May 2006    Post subject: Reply with quote
ZRX61 wrote:
Chris_northants wrote:
the emergency stall button

Thats a new name for it..... Rolling Eyes


I like the "Annoy the newbs button"

Or " The red switch that can give hours of amusement"

Never forget the time we hit every ones kill switch when they were parked up in Banbury Embarassed

A few people couldnt get there bikes started for ages. Its the best way to piss your friends off Thumbs Up
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