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by john.whiting
Sat Feb 23, 2013 11:09 am
Forum: Four stroke
Topic: M/cycle Sport mag. January 1964 and other engine combos
Replies: 3
Views: 490

Making a barrel is not hard,but you need different cam followers,which is hard(or expensive).Hence the lower part of the sidevalve barrel,which supplies all this ready made.Ariel actually used this idea in the early thirties,to rationalise production.Thru studs generally require plugging and redrill...
by john.whiting
Fri Feb 22, 2013 11:05 am
Forum: Four stroke
Topic: petrol additive
Replies: 18
Views: 1904

I have heard of exhaust problems in singles,but it might be poor quality replacement valves.If you keep an eye on valve clearances,you know straight away if something is happening.In vintage cars I know of valve burnout.Its particularly likely in 60s and 70s Holdens and Falcons,but also happens in o...
by john.whiting
Fri Feb 22, 2013 10:48 am
Forum: Four stroke
Topic: M/cycle Sport mag. January 1964 and other engine combos
Replies: 3
Views: 490

Making a 600 is quite simple.All you need is a SV motor,cut off the valve part and the upper fins,but leave the tappet chamber.Turn the top part of the barrel round,and install a made up sleeve with fins on.Fit a head thats suitable for thru studs,from what you have in your box of bits,and match up ...
by john.whiting
Fri Feb 22, 2013 10:28 am
Forum: Four stroke
Topic: Diametral Pitch (DP) of single's half time pinion ?
Replies: 1
Views: 505

Divide the number of teeth by the pitch diameter,which will be roughly at half tooth depth.Check the cam gear as it has more teeth,and the pitch circle will be closer to half tooth depth. All in inches.Alternatively, If you count the camwheel teeth and measure the O D ( not the pitch diameter.),I wi...
by john.whiting
Tue Feb 19, 2013 10:20 am
Forum: Ariel Talk
Topic: Oil Pressure Gauge onto a WNG
Replies: 13
Views: 1293

It wont be NPT,because thats American,but it might be BSP,and the two will screw together(28 vs 29tpi.)Its more likely brass thread,and an adaptor would be required.Oil lines to gauges often fail making a mess,or worse if its not noticed.A sender is the sensible alternative.Norton had a plunger that...
by john.whiting
Tue Feb 19, 2013 10:09 am
Forum: Ariel Talk
Topic: Huntmaster, too much oil! (lock-up)
Replies: 7
Views: 972

Obviously, if the oil tank holds 1/2 gal,there s simply not enough to fill the crankcase,let alone stop the motor from turning.A small quantity of fuel in a cylinder will certainly stop the motor turning over compression,but would it prevent the motor turning backwards? I doubt it. When your new car...
by john.whiting
Mon Feb 18, 2013 12:14 pm
Forum: Ariel Talk
Topic: Huntmaster, too much oil! (lock-up)
Replies: 7
Views: 972

Sounds very strange to me.It would take a gallon of oil to lock up an A10,and it certainly wouldnt leak down in a short time,even if your oil pump was loose .An engine full of petrol ,in one cylinder,maybe.Regards John.
by john.whiting
Mon Feb 18, 2013 11:40 am
Forum: Four stroke
Topic: NH 1951? Inlet valve recession
Replies: 19
Views: 2136

No offence,but beginners allways stuff up driving out guides.Either knock off the upper part,collar included and press them into the port,or carefully clean the cylindrical part inside the port and press from inside the port.Dont score the guide bore.If you heat the head the new guides will drop in....
by john.whiting
Mon Feb 18, 2013 11:17 am
Forum: Ariel Talk
Topic: Oil Pressure Gauge onto a WNG
Replies: 13
Views: 1293

Lights and senders used to operate at either 7 or 15psi, probably gone the way of every thing else and NLA. Ill correct that,because you can still get replica Harley pressure senders,and they re 6v,and operate at very low pressure,like 1psi. Thread 1/8 NPT.Regards John.
by john.whiting
Mon Feb 18, 2013 11:05 am
Forum: Ariel Talk
Topic: BSA hub to 1951 Ariel tele forks
Replies: 3
Views: 643

Its from a good old A10, [ or A7] 57 on ,this is the front wheel that replaced the alloy Ariel front when too many customers went on their ears after front brakes locked up.Regards John.

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