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by allan.walker
Sat Oct 31, 2020 7:41 pm
Forum: Four stroke
Topic: Vinegar to clean rusted tanks?
Replies: 16
Views: 511

Re: Vinegar to clean rusted tanks?

I haven't tried vinegar (acetic acid) but my acid of choice for de-rusting tanks is phosphoric. This is present in many soft drinks (we've all seen the old penny being cleaned in coca-cola.) A 50% concentration of phosphoric acid removes rust pretty quickly and, as has been mentioned earlier, it is ...
by allan.walker
Thu Oct 29, 2020 2:31 pm
Forum: Ariel Talk
Topic: Huntmaster R&D
Replies: 15
Views: 942

Re: Huntmaster R&D

BSA twins mounted the gearbox on 4 long studs direct to the crankcases and ran a 2 row chain and a hinged adjuster below the chain. This is a far better arrangement than the Ariel set up so use top quality chain and careful tightening of everything IF you are getting your Huntmaster to anywhere nea...
by allan.walker
Sat Oct 03, 2020 9:24 am
Forum: Four stroke
Topic: Sq4 MkI timing case breather pipe
Replies: 24
Views: 897

Re: Sq4 MkI timing case breather pipe

Thanks Chris!.
by allan.walker
Fri Oct 02, 2020 7:12 pm
Forum: Four stroke
Topic: Sq4 MkI timing case breather pipe
Replies: 24
Views: 897

Re: Sq4 MkI timing case breather pipe

chris.shearwood wrote:The Morgo pump for the Sq4 MK2 has internal pressure relief valve set at 55 psi. The Morgo for the MK1 (and earlier 4G) does not have the internal relief valve.


Which begs the question why?

Is there something fundamentally different in the oiling system between a Mk1 and a Mk2?
by allan.walker
Wed Sep 02, 2020 8:08 am
Forum: Four stroke
Topic: Engine Shock Absorber
Replies: 11
Views: 948

Re: Engine Shock Absorber

Thanks for the clarification, David.
by allan.walker
Tue Sep 01, 2020 8:10 am
Forum: Four stroke
Topic: Engine Shock Absorber
Replies: 11
Views: 948

Re: Engine Shock Absorber

Beg to differ Will - I'm running a 23-tooth on a 500 and it's very well suited to back roads 'cos the engine has plenty of low-down (and mid-range) 'oomph' (the only reason I can think of for even dropping to a 22-tooth is because of a 9:1 piston and HS camshaft and needing easy 80+mph on motorways...
by allan.walker
Mon Aug 31, 2020 9:51 am
Forum: Four stroke
Topic: Mk1 Sq 4 BLOWING HEAD GASKET
Replies: 30
Views: 2229

Re: Mk1 Sq 4 BLOWING HEAD GASKET

I have read on other motorcycle forums that helicoils can be unreliable in stressed situations (such as in a casting made of a soft grade of aluminium alloy.) The most frequent recommendation for stripped threads in such conditions is to use 'Time-Sert' inserts. Apparently, they have a much deeper a...
by allan.walker
Sat Aug 01, 2020 9:21 am
Forum: Four stroke
Topic: Mk1 Sq 4 BLOWING HEAD GASKET
Replies: 30
Views: 2229

Re: Mk1 Sq 4 BLOWING HEAD GASKET

I sympathise with the problem you are having! The only point I would make is that you said "I have put a straight edge across the mating surfaces and they both appear to be nice and flat. " If there is another leak at the same spot, with new gaskets and correctly torqued studs, it does mak...
by allan.walker
Wed Jul 22, 2020 8:21 am
Forum: Four stroke
Topic: Square Four/Huntmaster clutch maladies
Replies: 27
Views: 1392

Re: Square Four/Huntmaster clutch maladies

I think there may still be a problem with the studs loose in their holes ..... to allow a proper tight fit of the securing nut.....or . Could you explain your concern about the loose studs, please? I think that it will make fitting the springs and nuts potentially a bit fiddly, but what other probl...
by allan.walker
Tue Jul 21, 2020 8:00 am
Forum: Four stroke
Topic: Square Four/Huntmaster clutch maladies
Replies: 27
Views: 1392

Re: Square Four/Huntmaster clutch maladies

Eero.Korhonen wrote:Those rods are very soft, I think they are graded 4.6.

Yes, so I have ordered the correct ones with 'heads' that sit behind the clutch centre.

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