I can identify gear ratio by gear s/n?

by Przemysław Wiśniewski in 912 / 914 Technical Questions 7 years ago

Hi!
I have problem to identify gear's ratio. I have photos with s/n of gears but how by this I can identify radio of them?

20171009_172501.jpg (You do not have access to download this file.)

20171009_172408.jpg (You do not have access to download this file.)

Re: I can identify gear ratio by gear s/n?

by Rob Seaton » 7 years ago

Rob Seaton

3 1.32k 251

Hard to read...is that 05.1293? It will also be written on the dog gear and may be easier to read (maybe your flash or some reflection is hiding it in your photo?
if so, it is a 2.43:1 ratio p/n 886518
Installed on 912ULS s/n 5645119.

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Re: I can identify gear ratio by gear s/n?

by Bill Hertzel » 7 years ago

Bill Hertzel

13 1.95k 7.98k

If you are looking at the actual gears, just count the teeth on each gear and divide.
A 51 tooth gear being driven by a 21 tooth gear will give a 51/21=2.43 gear ratio.

Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
Clicking the "Thank You" is Always Appreciated by Everyone.

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Re: I can identify gear ratio by gear s/n?

by Stephen Kean » 6 years ago

Stephen Kean

2 13 18

Was this originally a 2.43 to 1 ratio?
914UL ENGINE ser# 4,417.569. 4417569 Gearbox serial 887705 12867

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Re: I can identify gear ratio by gear s/n?

by RotaxOwner Admin » 6 years ago

RotaxOwner Admin

59 1.59k 15.4k

4417569 was produced 13-Dec-1996.

That is old enough that there are no details for it registered in the factory database.
(So I am not able to determine with absolute certainty which gearset was originally installed...)

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Re: I can identify gear ratio by gear s/n?

by Bill Hertzel » 6 years ago

Bill Hertzel

13 1.95k 7.98k

An 887705 gearbox is/was installed on 914UL and 914F engines.
It is described in the Parts manuals as Gear Box, with Clutch, 2.43, Version #3 (22mm, Narrow Dog Gear)
Installed on Engines up to 4.417.790

It appears that the 887705 was replaced by the 887706 which was upgraded to the current 887708 with the New 27MM, Wide Dog Gear. But don't quote me on that.

Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
Clicking the "Thank You" is Always Appreciated by Everyone.

Thank you said by: RotaxOwner Admin

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I can identify gear ratio by gear s/n?

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