ES 250/2 carb question

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ES 250/2 carb question

Postby TJBERGLI » Sat Jul 08, 2017 10:38 am

Hello!

My ES 250 is running "ok", but l thought I would give the carb a good clean-up since I have some problems with getting a stable tick-over. The carb was clean inside but the floatlevel wasn't according to the book. But I discovered tha the needle was "stepped"? I've not seen that before on any of my bikes? Should it be like that?
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Re: ES 250/2 carb question

Postby Andy_C » Sat Jul 08, 2017 11:11 am

Sounds like you have fallen foul of fixing something that was not broke !

A stepped needle is usually a worn needle.

Sounds like you need a replacement needle and if you replaace the needle also replace the needle jet as both can wear and they are not expensive to replace.

I would replace, and double check the fuel level.
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Re: ES 250/2 carb question

Postby TJBERGLI » Sat Jul 08, 2017 12:31 pm

The needle was stepped i 3 different steps, each step has the same diameter. So sure it was ment to be so :twisted:
But yes, I think its the best solution to buy a rebuild-kit for the carb, if its available. The reason it want to clean the carb was because of poor tick-0ver. I thought may be the idle-jet was clogged.... But nope!
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Re: ES 250/2 carb question

Postby Andy_C » Sat Jul 08, 2017 12:48 pm

TJBERGLI wrote:The needle was stepped i 3 different steps, each step has the same diameter. So sure it was ment to be so :twisted:
But yes, I think its the best solution to buy a rebuild-kit for the carb, if its available. The reason it want to clean the carb was because of poor tick-0ver. I thought may be the idle-jet was clogged.... But nope!


Dont uderstand, if it is stepped the diameters will be different otherwise how can there be a step?

Perhaps I am mis understanding could you post a photo perhaps?
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Re: ES 250/2 carb question

Postby TJBERGLI » Sat Jul 08, 2017 1:41 pm

My english is not the best, I'm from Norway. But I'll try to explain it. The needle has 3 different diameters, at the lower end the first 1/3 of the lenght has one and the same diameter. Then there is a clear step up to i bigger diameter for the next 1/3 of the total lenght, and the last 1/3 of the lenght has an even bigger diameter.

I' ve ordered a rebuild kit from Gusi i Germany for 22 euros. Ihope that will do the jobb :D
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Re: ES 250/2 carb question

Postby Guesi » Sat Jul 08, 2017 3:34 pm

The stepped needle is for the 17,5 PS (horsepower) version of the ES 250/2.
The later 19 PS model had a "normal", conical needle.
So if you have the 17,5 PS version, you have ordered the right repair kit :-)
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Re: ES 250/2 carb question

Postby TJBERGLI » Sun Jul 09, 2017 2:47 am

How do I know? Mine is a 1969. May be the stepped needle is the right one?
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Re: ES 250/2 carb question

Postby Guesi » Sun Jul 09, 2017 8:17 am

Hello

What is written on your carb ?

28N1-1 or 28N1-3 ?
The stepped needle is for the 28N1-1, the conical needle is for 28N1-3.

Does your intake gasket look this way :
https://www.guesi-motorradteile.de/pic_ ... CI0091.JPG
you have a 19 PS cylinder.(for carb 28N1-3)
If the hole is oval, it is a 17,5 PS cylinder.(for carb. 28N1-1)
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Re: ES 250/2 carb question

Postby Andy_C » Sun Jul 09, 2017 9:25 am

TJBERGLI wrote:My english is not the best, I'm from Norway. But I'll try to explain it. The needle has 3 different diameters, at the lower end the first 1/3 of the lenght has one and the same diameter. Then there is a clear step up to i bigger diameter for the next 1/3 of the total lenght, and the last 1/3 of the lenght has an even bigger diameter.

I' ve ordered a rebuild kit from Gusi i Germany for 22 euros. Ihope that will do the jobb :D


Not a problem - your English is better that my non existent Norweigan !!

Now that the needle has been explained by others with more knowledge than me I understand, must admit that I have never seen a stepped needle before so you live and learn.

Hope the rebuild kit fixes your problems "lykke til" and "beste ønsker" as I believe they say in Norweigan.
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Re: ES 250/2 carb question

Postby TJBERGLI » Mon Jul 10, 2017 2:09 am

I've just checked the carb and it's a 28N1-1, so the stepped needle is the right one. And so is the rebuild kit l've ordered. Hope this will give me a more stable tickover :roll:
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Re: ES 250/2 carb question

Postby DAVID THOMPSON » Mon Jul 10, 2017 8:07 am

Try to run it on real gas the ethonal added fuek ruins carbs
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