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  #1  
Old 12-05-2017, 08:05 PM
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Jeff Vaughan Jeff Vaughan is offline
 
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Default Rotax Screw ID help needed

I found the screw shown below sitting on the left carb drip tray. Sorry the photo is rotated 90 degrees. I have searched for the spot it came from but have not been able to locate its origin.
Four additional RV builders were also unable to figure out where it came from. It is most definitely a Rotax screw because the torque seal color is an exact match to the torque seal they used on the rest of the engine. I noticed the screw before I had connected the throttle cable. It is tiny and I do not know what to call it so I can not look it up in the parts list. Any one have a clue?


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Last edited by Jeff Vaughan : 12-05-2017 at 08:12 PM.
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  #2  
Old 12-05-2017, 08:09 PM
AndrewR AndrewR is offline
 
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Looks like the throttle stop screw?

You should be able to spot a similar one on the other carb.
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  #3  
Old 12-05-2017, 08:14 PM
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I just edited my post. I noticed the screw a month or so before I ran the throttle cables.

There is not another screw this size on the other carb that is visable
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Old 12-05-2017, 08:29 PM
AndrewR AndrewR is offline
 
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In the illustrated parts catalog carburetor diagram I would say it is part 45, 963162 THROTTLE VALVE STOP SCREW.

I don't have a carb in front of me, but from the diagram it goes into the bracket that the springs attach to to pull the carb open. From memory it isn't an actual nut, more of a threaded spring washer sort of thing.

Or I could be wrong and it's something else entirely
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Old 12-05-2017, 08:54 PM
waterboy2110 waterboy2110 is offline
 
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Has this engine ran yet? Connecting throttle cables implies it hasnít. It looks like the screw you remove to tap into the balance tube for the MAP sensor.
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  #6  
Old 12-05-2017, 09:26 PM
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Piper J3 Piper J3 is offline
 
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Quote:
Originally Posted by waterboy2110 View Post
Has this engine ran yet? Connecting throttle cables implies it hasn’t. It looks like the screw you remove to tap into the balance tube for the MAP sensor.
Do you mean the screw on top of the intake manifold that you remove, and in its place, you screw in a barb fitting for rubber hose connection to vacuum gage for balancing carbs? By memory, that looks like the screw...
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Old 12-05-2017, 09:58 PM
waterboy2110 waterboy2110 is offline
 
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There’s a small screw that you remove from the balance tube (the tube that connects the two intake manifolds) It has barbs on the port and is closer to the left side. That’s what it looks like from the pics. If you’ve hooked up the tube pull it off and see if the screw fits. I can’t recall another screw like the one in MAP port.
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Last edited by waterboy2110 : 12-05-2017 at 10:12 PM. Reason: Info
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Old 12-05-2017, 10:08 PM
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I have not run the engine yet. I will investigate tomorrow and advise.
I do not want to run the engine till I figure this out.

Thanks for your suggestions!
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  #9  
Old 12-05-2017, 10:14 PM
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I think you are talking about #13
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  #10  
Old 12-05-2017, 10:18 PM
waterboy2110 waterboy2110 is offline
 
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Thatís the one Iím talking about.
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