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Old 03-21-2010, 05:49 PM   #1
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Default os speed al head 21h carb

I'm sorry for this. I'm sure the answer is here somewhere but I'm short on time someone please help looking for the stock needle setting for this mill thanks
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Old 03-21-2010, 06:31 PM   #2
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Originally Posted by gkn0315 View Post
I'm sorry for this. I'm sure the answer is here somewhere but I'm short on time someone please help looking for the stock needle setting for this mill thanks
try this.......

NEEDLE SETTINGS: These are pre-set from the factory and require
little or no adjustment
Needle Valve: 2.5 turns open from fully closed position
Metering Needle - Rotate until slotted head is extruded by 0.5mm
into ball link body
Mixture Control Valve - Rotate until slotted head is flush with ball
link body

tower hobbies has all the specs for all the engines on there site. some helpful info there... jeremy
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Old 03-21-2010, 06:33 PM   #3
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okay thanks
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Old 03-21-2010, 07:43 PM   #4
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Originally Posted by jer7469 View Post
try this.......

NEEDLE SETTINGS: These are pre-set from the factory and require
little or no adjustment
Needle Valve: 2.5 turns open from fully closed position
Metering Needle - Rotate until slotted head is extruded by 0.5mm
into ball link body
Mixture Control Valve - Rotate until slotted head is flush with ball
link body

tower hobbies has all the specs for all the engines on there site. some helpful info there... jeremy
Those are the old settings. OS revised them a while back. Here's a link to the OS manual.....http://manuals.hobbico.com/osm/21vzb-vspec-manual.pdf
Look at pages 17 and 22 specifically.
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Old 03-21-2010, 07:53 PM   #5
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ok cool thanks that were i put them
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Old 03-21-2010, 08:04 PM   #6
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those settings need little to no adjustment???

Mine probably would not even start with those settings.


i do have the new carb though
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Old 03-22-2010, 10:05 AM   #7
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INFO: I have an extra New in package OS 21H Speed Carb for $55.00 if anyone needs one.
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Old 03-22-2010, 10:10 AM   #8
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On the idle gap, do you use that mesurement with the carb restrictor in or out?
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Old 03-22-2010, 11:52 AM   #9
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On the idle gap, do you use that mesurement with the carb restrictor in or out?
Out
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