Choke not extending enough? By gingel (Read 856 times)

[gingel]

Hi,

I checked the choke that came with the carburetor, and i think it may not
extend enough, but it does retract back quickly.
Here is a picture after the engine ran about 5 minutes:




I have a spare choke, and i connected it to the wire harness, and
let the engine run, and this choke extend very quickly,
and retract back very slowly.
After about 1 min of the engine running, the choke was like that:



Are both of these choke malfunction, or only the first one (that came with the carburetor)?

Many Thanks.

[Bashan]

The plunger should extend 3/16" in 5 to 10 minutes with 12v of current. Retracting doesn't matter, that's what it does after you shut the bike off. Rich

[gingel]

Can you see the difference between the two chokes i have?
Does it look like the first one is not going all the way out?

Also, the second choke is extending in less than a minute.
I installed it inside the carburetor, and at first the rpm is high,
as it should, but after less then a minute it drops down,
while with the first choke it's taking 2-3 minutes until rpm drops down.

Do i have bad chokes?

[sprocket]

The bottom one is fine...as far as extension is concerned..run it at 10 volts that should slow it down...it should take 3 minutes to fuly extend

Maybe swap heater parts..you should be fine

[gingel]

How do you open the choke? (to replace the heater)

Is there a way to run in at 10 volts?

[Bashan]

I would check the voltage on the supply wires to the choke before you do anything just to see what you're getting. Did you measure how far the plunger comes out? 3/16", that's what it should be. That would be a lot easier than trying to judge whether it looks correct on a forum picture. I have another question, is it starting hard or running like crap? If it's working OK I'd let it be. These engines are quirky and if it ain't broke don't fix it. Go with the choke that makes it run the best, it won't hurt anything. Rich

[gingel]

I checked today the voltage to the choke, and it's 11.9-12.2 Volts AC.
I didn't measure the plunger.

Regarding the starting, that's the strange thing.
With the first choke (the one that extending less), i need to give it a
little throttle so it will start from cold, and even 20-30 min after i shut
down the engine.

With the second choke (the one that is extending more), the scooter
fire up right away, no throttle needed, engine cold or hot.

Both of the chokes needles are at the same height when cold, so
i really don't know what makes the scooter to start ok with
one,
and have some difficulty with the other.

[sprocket]

Use the one that works the best..or buy a third, they are cheap..

[Bashan]

Listen to the mighty Sprocket, use the one that works. The other one could have a bad seal or be inhabited by an evil Chinese demon...who knows? The choke works by shutting off as they extend, the enricher circuit is on with the plunger retracted. Here's how they work. Rich

[gingel]

Ok,

I will keep inside the one that the scooter work with it best.
Btw, i was quickly to say that is start up right away from completly cold engine.
After the engine was cold after 10-12 hours, i still needed to give it a little throttle,
but still it's starting more easy.
The big difference is that i don't need to give it throttle after the engine was off for 20-30 mins.

Thank you.

[Bashan]

Have you set your valves? That can cause that problem. Rich

[gingel]

Yes, The first thing i checked.
This cold start problem was from the day it was new, so this is how it is.
But the starting problem after 20-30 min, started after i changed carburetor. so i guess it's because of the choke that came with it.

[sprocket]

Might adjust your air/fuel mixture..it makes quite a difference to the way my Lifan starts

[gingel]

I tried to play with the air/fuel mixture when the old choke was inside,
and it didn't help.
Do you think that now with the other choke, it could do a difference?
I'll try today or tomorrow, to see if it change something.