ES 250/2 carb question

[TJBERGLI]

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?

[Andy_C]

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.

[TJBERGLI]

The needle was stepped i 3 different steps, each step has the same diameter. So sure it was ment to be so
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!

[Andy_C]

The needle was stepped i 3 different steps, each step has the same diameter. So sure it was ment to be so
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?

[TJBERGLI]

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

[Guesi]

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

[TJBERGLI]

How do I know? Mine is a 1969. May be the stepped needle is the right one?

[Guesi]

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)

[Andy_C]

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

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.

[TJBERGLI]

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

[DAVID THOMPSON]

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