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Re: 1955 Huntmaster questions

Posted: Wed Sep 02, 2020 12:37 am
by john.whiting
Ive found with Nortons ,that are notably incontinent,best policy is to drain the oiltank after a run ,and store the oil in a plastic 2l bottle...........you will be amazed how much black sediment settles out........and there will never be a flood of oil on the floor....................I know what is going to be said .....but I never ,ever, start any bike without checking the oil tank,or sump for level.

Re: 1955 Huntmaster questions

Posted: Wed Sep 02, 2020 1:14 am
by Simon.Gardiner
I've never felt the need for an extra non-return tap on an A10 or a Huntmaster, and I don't know of anyone 'around here' who's using one in a 650.
As Will says, there is an inbuilt ball valve in the oil feed (in the crankcases, behind the oil pump). However, you can't easily check/clean it without a total engine strip, and I do know of some instances where folks have had bikes that did drain excessive amounts of oil into the sump (but in my experience that is the exception, not the rule).

HTH

SG

Re: 1955 Huntmaster questions

Posted: Wed Sep 02, 2020 6:59 am
by Mick D
Hi

To my knowledge there's no specific anti wet sumping valve on an FH, not wet sumping relies on the integrity of the oil pump.
There are two ball valves in the engine: one is the pressure relief valve, the other the sump return check valve - neither of which function to inhibit wet sumping.
In my opinion, the type and configuration of oil pipes on an FH does not lend itself to the unobtrusive installation of a valve:

Oil Lines.png
Oil Lines.png (204.78 KiB) Viewed 408 times


I try to ride my bikes at least once a month but if weather is against me I start and run them until up to temperature

Regards Mick

Re: 1955 Huntmaster questions

Posted: Wed Sep 02, 2020 9:33 am
by Simon.Gardiner
Mick D wrote:
To my knowledge there's no specific anti wet sumping valve on an FH, not wet sumping relies on the integrity of the oil pump.
There are two ball valves in the engine: one is the pressure relief valve, the other the sump return check valve - neither of which function to inhibit wet sumping.


Noooooooo - there are three valves!! Look carefully for the position of the 'anti-syphon valve' behind the oil pump!
(I know it's a diagram for an A10 - Huntmaster is the same.)

SG

Re: 1955 Huntmaster questions

Posted: Wed Sep 02, 2020 12:25 pm
by Mick D
Thanks Simon - Every day is a school day :oops: :oops:

I guess this is the access to it:

Anti Syphon.png
Anti Syphon.png (231.61 KiB) Viewed 393 times


Regards and sorry for any confusion caused - Mick

Re: 1955 Huntmaster questions

Posted: Wed Sep 02, 2020 12:43 pm
by Simon.Gardiner
Spotted!! And that pic shows exactly why it's not easy to 'service'!

SG

Re: 1955 Huntmaster questions

Posted: Thu Sep 03, 2020 10:40 pm
by david weare
Hi Will
Thanks for the advice.
I have heard horror stories of people forgetting to turn in line taps on.
That would be me.
D

will_curry wrote:There should be one already built-in but they're not always that effective.
However, it's been a long time and I can't remember how to get to it.

I'm not a great fan of add-on non-return valves. If anything goes wrong
it's a wrecked engine. A friend of mine had one fail on a Matchless
twin - not a pretty sight and extremely expensive.

The best way to keep the oil where it belongs is to use the bike frequently.

There are a number of Huntmaster users who regularly contribute to this
forum. Hopefully one or more will be along soon.

Re: 1955 Huntmaster questions

Posted: Thu Sep 03, 2020 10:42 pm
by david weare
Thanks Simon.
OK, I don't mind a little bit of oil deposit.
May treat myself to a tea tray and bungee on the parcel rack
D

Simon.Gardiner wrote:I've never felt the need for an extra non-return tap on an A10 or a Huntmaster, and I don't know of anyone 'around here' who's using one in a 650.
As Will says, there is an inbuilt ball valve in the oil feed (in the crankcases, behind the oil pump). However, you can't easily check/clean it without a total engine strip, and I do know of some instances where folks have had bikes that did drain excessive amounts of oil into the sump (but in my experience that is the exception, not the rule).

HTH

SG

Re: 1955 Huntmaster questions

Posted: Thu Sep 03, 2020 10:48 pm
by david weare
Thanks Simon
I'll see how I go with the orginal ball valve.
David


Simon.Gardiner wrote:I've never felt the need for an extra non-return tap on an A10 or a Huntmaster, and I don't know of anyone 'around here' who's using one in a 650.
As Will says, there is an inbuilt ball valve in the oil feed (in the crankcases, behind the oil pump). However, you can't easily check/clean it without a total engine strip, and I do know of some instances where folks have had bikes that did drain excessive amounts of oil into the sump (but in my experience that is the exception, not the rule).

HTH

SG

Re: 1955 Huntmaster questions

Posted: Fri Sep 04, 2020 12:41 pm
by john.mitchell
My FH always eventually wet sumps. Years ago I put a thread in the bottom of the sump plate so a bolt could screw in. - It is a lot easier to drain surplus oil that way.