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Transmission vent kit.

Modern 961 Norton Commando Motorcycles

Transmission vent kit.

Postby NORTY2 » Thu Mar 16, 2017 4:22 am

Just a nod in the direction of CNW whom supplied me with a vent kit. Great product, well made and easy to fit if you follow the guide supplied by Richard 7.
Thanks guys.
Mark.

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Re: Transmission vent kit.

Postby TonyA » Thu Mar 16, 2017 10:16 am

A very worth while and NEEDED mod. Those not running a vent will eventually get leaks caused by pressure building up in the trans/primary. Even my Ford truck has a vent in the differential/rear axle housing . The vintage Commando even had a small vent hole in the trans fill/inspection cap. Those of you who don't run a trans/primary vent should perform this test : When you change trans oil next time , remove the trans drain plug only and watch how SLOWLY the oil comes out . Then quickly break loose the fill plug and watch it FLOW out ! If that doesn't convince you then nothing will ! Sorry to say. Richard you can't say I didn't try .

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Re: Transmission vent kit.

Postby Britfan60 » Fri Mar 17, 2017 4:45 am

It eased MY pain. Just get it.
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Re: Transmission vent kit.

Postby BLIGHTYBRIT/SF » Fri Mar 17, 2017 10:09 am

Yes ditto , I've done 10,000 miles now ,vent kit been on since 2,000 mile,s , have no leaks anywhere ,thanking Richard 7 & dad again.
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Re: Transmission vent kit.

Postby xbacksideslider » Fri Mar 17, 2017 11:42 am

Why do you suppose that that tiny hole in insufficient to vent the trans? Doesn't the temp rise and fall slowly?
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Re: Transmission vent kit.

Postby TonyA » Sat Mar 18, 2017 6:31 am

Hello , You are not reading my post correctly. What I wrote was that the Vintage Commando (1969 to 1975) has the vent hole in the trans fill cap... I don't refer to the 961 as the Vintage Commando . I hope that is clear now.

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Re: Transmission vent kit.

Postby xbacksideslider » Fri Mar 24, 2017 11:52 am

I'm not talking 961.

Just asking why a standard Commando's pin hole vent (the one in the fill cap) is inadequate, given that the rise and fall of temperature in the gear box is slow and that there is a good volume of free air above the gear lube as well.
John Laing
1973 750 #220000
1986 GSXR 1100
2008 CBR 1000
1986 Shelby GLHS #463
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Re: Transmission vent kit.

Postby BPHORSEGUY » Fri Mar 24, 2017 2:20 pm

[quote="xbacksideslider"]I'm not talking 961.

Just asking why a standard Commando's pin hole vent (the one in the fill cap) is inadequate, given that the rise and fall of temperature in the gear box is slow and that there is a good volume of free air above the gear lube as well.[/quote

If you are asking if the pinhole would work on a 961 like it does on a vintage bike, the answer is yes absolutely. It would relieve the pressure and prevent the pressure leaks. It however would not be Euro 4 compliant as you would be venting to open air. Some would say that it would let water in but it didn't back in the day!

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