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Please measure

  • rogerl1961
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2 months 5 days ago #20483 by rogerl1961
Please measure was created by rogerl1961
I need to know the size of the carburetor balance hose. Either the internal size of the hose or the size of the metal connector that the hose connects to. The hose I’m talking about is the hose you take off to separate your carbs when doing the carb synch. I purchased the carb synch kit from aircraft spruce but it doesn’t seem to have the correct fittings to connect to the 912uls. Can anyone help me by telling me the sizes I need to connect my synch gauges up.

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2 months 4 days ago #20502 by bravo23c
Replied by bravo23c on topic Please measure
I think it is 11mm or 7/16" .
The following user(s) said Thank You: kiwiatd

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2 months 3 days ago - 2 months 3 days ago #20503 by tomkk
Replied by tomkk on topic Please measure
I have that same kit from AS&S. There appears to be no easy way to connect it to the Rotax to balance the carbs. What I ended doing was to drill out the inside of the large black fittings to fit the OD of the crossover tube and the pilot side carb tube and got a small hose clamp for each of those. Seems to work OK but I'd welcome an alternative idea for connecting this set to the Rotax.
Last edit: 2 months 3 days ago by tomkk.

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2 months 3 days ago - 2 months 3 days ago #20504 by Roger Lee
Replied by Roger Lee on topic Please measure
Here is a picture of a homemade sync tool. You can buy brass fittings from Ace Aviation (Ace Hardware) (any hardware store). Don't use polyvinyl hose like in the picture. Use regular vacuum hose. The picture is more to look at the hose fittings.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell

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Last edit: 2 months 3 days ago by Roger Lee.

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