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Author Topic: Stihl MS250, carb adjusting needles identification  (Read 1197 times)

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Offline rlueth

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Stihl MS250, carb adjusting needles identification
« on: February 15, 2016, 10:10:10 PM »
Completely disassembled my ZAMA carb on the 250 and blew out/cleaned all passages.  Now putting it back together and realize the two adjusting needles are different.  One has a sharp tip, the other is blunt.  Which is high speed and which is low speed adjustment ?  Thanks

Offline joe_indi

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Re: Stihl MS250, carb adjusting needles identification
« Reply #1 on: February 15, 2016, 10:18:35 PM »
Dont worry!
The one with the sharp tip goes into L  and the blunt one into H.
And, you cant go wrong even if you are blind  :D the screws dont have threads of the same pitch so you just cannot goof up. JOE

Offline ZeroJunk

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Re: Stihl MS250, carb adjusting needles identification
« Reply #2 on: February 15, 2016, 10:18:55 PM »
They should have a different thread and impossible to mix up.

Sorry Joe, beat me to it.

Offline terrifictimbersllc

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Re: Stihl MS250, carb adjusting needles identification
« Reply #3 on: February 16, 2016, 07:21:19 AM »
Zama says the L screw is always longer than the H screw, and on dual needle carbs are not interchangeable.  First paragraph in attached link.
http://www.zamacarb.com/page/disassembly_servicing_1
DJ Hoover, Terrific Timbers LLC,  Mystic CT Woodmizer Million Board Foot Club member. 2019 LT70 Super Wide,  LogRite fetching arch, WM BMS250 sharpener/BMT250 setter.  2001 F350 7.3L PSD 6 spd manual ZF 4x4 Crew Cab Long Bed

Offline rlueth

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Re: Stihl MS250, carb adjusting needles identification
« Reply #4 on: February 16, 2016, 11:21:06 AM »
The threads are exactly the same on each needle, but they are slightly different lengths and the tips are different.  Maybe this isn't a ZAMA carb.  The ONLY markings I can find on the carb are HL lC.  Anybody know what brand this carb is ?  Thanks

Offline Jiles

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Re: Stihl MS250, carb adjusting needles identification
« Reply #5 on: February 16, 2016, 12:42:18 PM »
Over the years, I have rebuilt hundreds of carburetors from auto to leaf blowers. After many failed rebuilds, I have decided to just replace Chinese made Zama carbs with new ones. The cost is very little more then repair kits???
Never had a real problem with other brands.
As far as Zama carb numbers, most I have dealt with have acid etched numbers on a flat section of carb body. This number is sometimes hard to see and will sometimes be rubbed out.
Very poor way to mark anything!
Satisfy needs before desires


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