Blueadventures
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Has anyone modified their Rotax 912 ULS with a larger size crossover pipe and if so what where you findings? There is a production 1" id manifold (Flygas Engineering) and cross over pipe available, likely $2,000 AUD in price. Seems the main benefit is smoother idle and low rpm's.
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Just bumping question, are any forum members attending this course? The date should have read 2026 (My bad) 19 to 21 January 2026.- 1 reply
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If any doubt you could sit the gear wheel on a piece of thick paper and spray paint around it and post that to them to ensure correct size. Only if there is a doubt about size. Cheers.
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Zonsen Aero Engines - Rapture Aviation (Adelaide)
Blueadventures replied to Rapture's topic in AUS/NZ General Discussion
It would have been a good development to increase the cross over pipe at the time of doing the casting patterns for the intake manifolds as there is good feedback from those that do such about the smoother idle and possibility of operating at 50% power in the instance of one throttle cable / connection breaking and engine going to full power on one carby. Would have been a good change to what Rotax have there in my opinion. (I'm open / planning to increase my R ULS balance pipe i.d. size.) -
What fuel in use and method (Carb or injected)?
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What fuel in use and method (Carb or injected)?
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Wonder if there are applicable colour endorsements available?
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Try my epoxy method on an old oil bottle and see what you think about it. I've done it a few times.
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No flying this weekend with our little cyclone visit. Hope everyone in the area is safe. The effect is now between Bowen and Sarina. Should be over the coast in 3 to 5 hours.
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I have been researching float bowl fuel leakage on my 29 year old Rotax 912A Bing 64 Carbs.
I noticed that you posted a few years ago that you had this problem. I am 90% sure I need to replace the float needle seats (I buggered them up trying to clean/resurface the donut shaped hole :-()
I have replaced float needles and floats.
These seats seem to be pressed or screwed in and not readily replaceable?
Did you manage to replace your float needle seats? Where did you source the new seats?
Not available from Rotax I think?
Maybe a BMW motorcycle parts supplier?
I hate this float system design and would change to Fuel Injection but it would cost more than my aeroplane is worth!!
Any comments would be appreciated!
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Send your email and I'll send the info I have. I have not replaced the seats but have details on the part number and how to remove them. A mates plane I service had a leak I could not sort and Wal said may be seat corrosion that is only seen under magnification. I sent the carbs to him and fixed all good and no further issues since.
Do you use the rotax tool to set the float bracket height; they are great to use.
Cheers
Mike
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Hi Mike
Thanks for the reply! I wonder what Wal did to fix the problem?
I have done some more research and can share my results:
I think the only way forward for me is to try and remove the float needle seat with the risk of damaging/destroying the carburetor body.
Why are secondhand Rotax carbs so hard to come by? There must be thousands tucked away in boxes all over OZ/World?
I found a supplier of the float needle seats in the USA who reckons you remove the old seat with an 8mm x 1.00 bottoming tap (which I have ordered) and heat the carb body.
In addition, I will try freezing the tap before using in the hope that this will cool the brass seat and further loosen the fitting? Fingers crossed.
The problem with sourcing from the USA is the postage costs more than the items!
I have found two Perth based BMW motorcycle shops who appear to stock the seats and viton tipped float needle valves. I am in the process of validating that these are identical to the Rotax Bing 64 types - would be great if they are and a 10th of the price!
I have not yet sourced the jig for setting float bracket height - just used calipers so far to save money!
My email address is [email protected]
cheers
Neil
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Agree, and I do it still, also when doing low rpm descents I bump rpm up to observe response then back to rpm setting.
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Zonsen Aero Engines - Rapture Aviation (Adelaide)
Blueadventures replied to Rapture's topic in AUS/NZ General Discussion
Agree, also about 9 years ago rotax altered the spec of their oil filters to be a couple of mm longer and then they would not come off with the header in place on the factory exhaust system (talking UL and ULS). -
Zonsen Aero Engines - Rapture Aviation (Adelaide)
Blueadventures replied to Rapture's topic in AUS/NZ General Discussion
It would be a mockup, my Rotax set up is similar re header to oil filter (although a bit more clearance) I cannot remove my oil filter whilst the header is in place. This is not an issue; as I replace the oil filter every second oil change (100 hrs) and remove the header as I 'Kopper kote' the ball sockets of the header to the muffler every 100 hrs. I see the mock up is tube in tube fit header to muffler and expect it would be a ball / socket type to allow slight movement for alignment etc. -
I was in the back, they couldn't get the engine running right so cancelled and refunded the ticket. Heard later recent o that day it had a engine issue and only just got back to the strip.
