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Old Sep 24, 2025 | 05:32 AM
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Default Foot shifter vent

I'm wondering where the vent is in a 4-speed transmission (1979-1984).

I took the transmission in for repairs, and they replaced all the gaskets on the maindrive gear, the cover, etc.

It's leaking oil, more than before. It's leaking from the primary and also from the kickstart shaft.

I'll fix the gaskets on the maindrive gear and the kickstart shaft better, but I suspect the vent has been closed, where is?


 
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Old Sep 24, 2025 | 06:22 AM
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From: la la land jerzey
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Hi gear bushing is worn or the mainshaft its self - the brass used is so tough on the steel it wipes it into an oval you need to hold the mainshaft cleaned and dry and hi gear with out the end seal and see how much play is in the two - the rear sprocket is trying to turn it sideways as you accelerate every time you turn the throttle so - in the shop we fit the bushing to a straight mainshaft at .0015 - if you have a 1 inch mike or veneer caliper you can measure it and see if its ege shaped and its no longer round — and the only mainshaft you have a chance of being correct is an Andrew’s - all the in-house from suppliers is a china POS
 
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Old Sep 24, 2025 | 06:40 AM
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One of the screws has a hole in it to serve as vent
 
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Old Sep 24, 2025 | 08:18 AM
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Originally Posted by eighteight
One of the Top Cover screws has a hole in it to serve as vent
Fixed a bit
 
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Old Sep 24, 2025 | 11:13 AM
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I found two vent holes (clogged).
One goes into the gearbox and one into the kickstarter. See photo.
But I expected to find drilled bolts or something else.
When you tighten the bolt, the hole closes. How does the air get through?



 
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Old Sep 24, 2025 | 11:17 AM
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view V-Twin part # 17-0432
 
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Old Sep 24, 2025 | 04:33 PM
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From: la la land jerzey
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They are not supposed to have gear oil dont care what you think open the factory shop manual and read the statement that sayes - motor oil the same stuff you use in the engine you use in the 1936 to 1985 4 speed trans
 
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Old Sep 24, 2025 | 07:38 PM
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All of above is true for 1978 and down transmissions. In 1979, the Cow Pie was introduced. It vents from a small hole in the side of the "tower" on top of the transmission.
 

Last edited by joe40x; Sep 24, 2025 at 07:57 PM.
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Old Sep 25, 2025 | 02:04 AM
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Originally Posted by joe40x

All of above is true for 1978 and down transmissions. In 1979, the Cow Pie was introduced. It vents from a small hole in the side of the "tower" on top of the transmission.
just being lazy ...is that breather hole accessible insitu ?
 
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Old Sep 25, 2025 | 06:21 PM
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Originally Posted by johnjzjz
They are not supposed to have gear oil dont care what you think open the factory shop manual and read the statement that sayes - motor oil the same stuff you use in the engine you use in the 1936 to 1985 4 speed trans
You wouldn't believe the chuckle heads that argue that with me, that and 20-50 is fine in a shovel.
 
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