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Bike starts when cold, then stops and is very hard to start

 
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jimmy1973gb



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PostPosted: Mon Jul 05, 2010 6:04 pm    Post subject: Bike starts when cold, then stops and is very hard to start Reply with quote

My Huatian HT125T-23 will start first kick in the morning, but then stops almost immediately. It then takes a very long time to start, but when it does eventually start its quiet and smooth and drives 100%.

To try and fix this I have changed the spark plug, this made no difference at all. I then changed the fuel filter and this made no difference, however since doing this it now runs out of petrol around the half way mark on the fuel guage, but will worry about this later.

This has got to the stage now where my battery is drained and I have to use the kick start rather than the electric start. I'm at my wits end and its putting me off using it.

Does anybody have any ideas what maybe up with my bike? Any help will be very much appreciated.


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larry8



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PostPosted: Mon Jul 05, 2010 6:36 pm    Post subject: Reply with quote

It's possible the carb float is sticking.



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jimmy1973gb



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PostPosted: Mon Jul 05, 2010 8:07 pm    Post subject: It's possible the carb float is sticking. Reply with quote

The bike runs 100% once its started the second time, its just the first start that it conks out and takes a lot of tries to start.

The bike used all the fuel in the tank without a problem until I changed the fuel filter, now it only seems to use half a tank and runs out, It done that when it was 6 months old then the place where I got it done something and it was fine afterwards, but they never said what it was and there was no charge. SHould the fuel filter be high up or low down, as its just hanging there. I think its a gravity fed fuel system, so would the position of the filter make a difference?

If I refill the tank again the bike will go for another 60 miles or so and then run out even though its half full, if it was a sticky float would it not be more frequent?


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larry8



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PostPosted: Mon Jul 05, 2010 8:29 pm    Post subject: Reply with quote

I was thinking of the stalling after initial starting about the float. It may stick closed and after the first start starts working again.

Now for the stopping after 1/2 tank. This sounds like the fuel cap is not venting and creating a partial vacuum in the tank. Try your next run with the gas cap loose. If that solves the problem then just drill a small hole it the cap.



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jimmy1973gb



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PostPosted: Mon Jul 05, 2010 8:34 pm    Post subject: Reply with quote

When I open the fuel cap and close it again without filling it goes for a mile or two and then runs out of fuel again, so I carry a fuel can and refull it and its fine. I think you are probably right, I will try what you say and hope for the best Smile

I am off work for 2 weeks at the end of this week, is it hard to check for a sticky float? I take it the carb has to be stripped? If the float is sticking is it just a matter of adjustment, or do I need to replace the float?


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larry8



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PostPosted: Mon Jul 05, 2010 10:29 pm    Post subject: Reply with quote

Yes, you have to take the carb off the engine and remove the plate on the bottom. The 4 screws are on VERY tight, so you have to be careful not to strip the heads. Once removed the float is exposed. You can clean it out with spray carb cleaner and check the operation of the float by gently pushing it up and down.



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jimmy1973gb



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PostPosted: Wed Jul 07, 2010 8:49 pm    Post subject: Reply with quote

2 days ago I tried to start the bike, it dont its usual, started first kick and conked out, I then proceeded to try and start it with the kick start for around 50 kicks, but it didn't start. Anyway I was feeling energetic tonight, so went out to try and start it, gave it one kick and it started and then conked out after about 3 seconds, then proceeded to give it around 10 more kicks and it didnt start. I am so puzzled, I didn't expect it to start at all.

The man in the shop I bought it off said he thought it was a vacum pipe problem, I am wondering if its the automatic fuel shut off valve, I say this because I went to a website that sells spares for my bike and they list one of these for my bike.

I am reluctant to strip the carb down incase I cause more problems, and will only do so if I have no other choice. If one of these automatic fuel shut off valves were faulty, what would happen?


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larry8



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PostPosted: Wed Jul 07, 2010 9:25 pm    Post subject: Reply with quote

You could replace the valve and the vacuum hose connected to it and see if that makes any change. If that fixes the problem, it would be a cheap fix. And if it doesn't fix it you gain some experience (although you would still have to take the carb apart).



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jimmy1973gb



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PostPosted: Mon Jul 12, 2010 10:37 am    Post subject: Reply with quote

I by-passed the fuel auto shut off valve, which was attached to the frame, took the bike a drive and that charged the battery. I went out the next day and it started first touch of the starter and kept going Wink, so the fault was the fuel auto shut off valve. Is the fuel shut off valve needed? Should I fit a manual tap valve instead or fit a direct replacement?

The other problem with the bike running our when half full I think I may have cracked, but have to test to be sure. The fuel filter was too high, so I'm thinking when the feul in the tank got down to the level where the filter was it just didnt drain, so I have lowered the fuel filter to below the tank, and thinking back its where it ws before I changed it, will have to go a long drive today to test the theory.


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larry8



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PostPosted: Mon Jul 12, 2010 10:51 am    Post subject: Reply with quote

You need a fuel shutoff valve as it's a safety feature that is necessary when the scoot tips over or in an accident. It can be a manual or automatic valve.
There are "in line" manual valves at nost lawn mower places, or if you have a threaded fitting in the tank you can get a threaded one.

And yes, the filter should be below the tank.



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Mybabies:
'67 BMW R69S-"Toots" in rehab
'09 SC250
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'04 Chinese 125
'06 X9-500
'08 MP3-400
'06 BV500
'09 Mana
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jimmy1973gb



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PostPosted: Mon Jul 12, 2010 10:55 am    Post subject: Reply with quote

Many thanks for your help, I will make a point of fitting a new valve Smile, feel like a weight has been lifted off my shoulders now my bike is working again, think is a great website where scooter owners can help each other from all over the world Smile


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larry8



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PostPosted: Mon Jul 12, 2010 11:29 am    Post subject: Reply with quote

Ya, this is a great forum. And it's the generosity of the members that keeps it great.



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Mybabies:
'67 BMW R69S-"Toots" in rehab
'09 SC250
Previous rides:
'04 Chinese 125
'06 X9-500
'08 MP3-400
'06 BV500
'09 Mana
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