choke plunger tip/seal

Maestro, SEI-V
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RobinSF1
Posts: 35
Joined: 29 Jun 2020 06:05
Location: Merthyr Tydfil Wales

choke plunger tip/seal

Post by RobinSF1 »

I have stripped and cleaned my carbs (+petcock filters and rinsed out the tank with paraffin) following some petrol starvation due to muck blocking the filters and some fine sediment in the float bowl.

The end of the 'choke' plungers have a rubber/viton seal which has a doughnut shaped indentation i.e. outer ridge and pip in the middle. Is this how they are meant to be? Whilst I had no obvious carburation problems before my last ride, thought it worth checking if these should be replaced before ordering some other carb bits. I'm assuming they are original 40,000 mile/40 year old parts.

Thanks Robin
RobinSF1
Posts: 35
Joined: 29 Jun 2020 06:05
Location: Merthyr Tydfil Wales

Re: choke plunger tip/seal

Post by RobinSF1 »

To answer my own question, the seal shouldn't be as I described, this will lead to rich running. I had thought I would have to buy complete choke assemblies but replacement tips are available for £7/pair with free postage.

This ebay ad shows before and after pictures. https://www.ebay.co.uk/itm/324178663069 ... MyEALw_wcB
Steve Brown
Posts: 1390
Joined: 12 Nov 2007 23:44
Location: Leicestershire

Re: choke plunger tip/seal

Post by Steve Brown »

I've bought these and yes they are fine. It is normal for the rubber to take a bit of a 'set' or an imprint but so long as it is still soft enough it will seal. You do find them crumbling and broken sometimes so well worth checking.
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3potjohn
Posts: 1243
Joined: 02 Jun 2007 13:58
Location: Devon

Re: choke plunger tip/seal

Post by 3potjohn »

Not unusual to have choke pistons perish causing an increasingly rich mixture and not just on Dellortos. My Bing slide carbs did exactly this on a 60/7.
John
Vitesse
Posts: 218
Joined: 05 Jan 2019 13:42
Location: Barnacle
Location: Crowcombe

Re: choke plunger tip/seal

Post by Vitesse »

I was told that the answer is to keep the chokes "on" when the bike is not in use. That stops the tips deforming. Makes sense.
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