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by john.whiting
Sat Sep 21, 2019 7:06 am
Forum: Four stroke
Topic: Lucas MN1E Magdyno on my 1938 square four
Replies: 2
Views: 60

Re: Lucas MN1E Magdyno on my 1938 square four

yes, had a look at a couple ....screw is dome head and very close to the ring......I suspect fibre block wear is the problem, block needs renewing,or maybe it can be packed up with a plastic shim........on the subject of mags,can a points plate for a BTH be obtained......I have several that I want t...
by john.whiting
Wed Sep 18, 2019 4:54 am
Forum: Four stroke
Topic: Square 4 MkI - too lean or too retarded?
Replies: 11
Views: 267

Re: Square 4 MkI - too lean or too retarded?

If you are using ethanol fuel,it automatically leans the mixture,due to having only half the energy of straight hydrocarbon .....for instance,a 15% ethanol mix is equivalent to a 7 1/2 % leaner mixture ,when using the jet calibration in an old carby.
by john.whiting
Mon Sep 16, 2019 3:24 am
Forum: A Bad thing happened to my Ariel
Topic: Piston problems Model C
Replies: 4
Views: 137

Re: Piston problems Model C

Insufficient,or deficient cam relief,if you ask me .....in fact it looks like the piston is just plain round ,with no taper,and no cam.....there was similar one pictured a few weeks ago,and I thought the same thing then........if you are going to use a round piston,give it plenty of clearance...like...
by john.whiting
Sun Sep 15, 2019 11:49 am
Forum: Four stroke
Topic: Another Single Cam Thread
Replies: 3
Views: 896

Re: Another Single Cam Thread

Its more important to have the rod central when the mainshaft is pulled over by the sprocket spring.......I know the BSA factory used to have gauges to ensure Gold Star rods were exactly centralized in the crankcases.
by john.whiting
Sun Sep 15, 2019 11:44 am
Forum: A Bad thing happened to my Ariel
Topic: "That hasn't happened before . . ."
Replies: 24
Views: 1662

Re: "That hasn't happened before . . ."

If you want to fit nuts in a spot like that,you can do a proper job by simply getting some thick washers and bevelling them to suit the angle of fit...............I had a similar thing with my 1200 Harley...all the rivets holding the sprocket ring onto the drum came loose....the 1200 sv doesnt have ...
by john.whiting
Fri Sep 13, 2019 11:37 am
Forum: Ariel Talk
Topic: 1948 Iron 4G Coil Ignition
Replies: 64
Views: 5461

Re: 1948 Iron 4G Coil Ignition

I was talking to someone had a 6 cyl head reco d,and decided to fit all new ignition electrics.......bulk trouble ,like a carby problem,but he was able to borrow a working carby off another motor ,which made no difference...........after much mucking about,he discovered his new coil was too high vol...
by john.whiting
Wed Sep 11, 2019 1:02 pm
Forum: Ariel Talk
Topic: QD hub dismanteling
Replies: 16
Views: 1296

Re: QD hub dismanteling

I would suggest using a backup that bears close as possible to the centre tube part of the flange......dont just press against the raised ring..........The Enfield wheels pressed apart easily,very little force was needed,and the ground surface of the tube was dimensionally identical between hubs.......
by john.whiting
Tue Sep 10, 2019 11:58 pm
Forum: Four stroke
Topic: Twin head gasket
Replies: 6
Views: 935

Re: Twin head gasket

The original A10 gasket was composite,and you wont get one the same ,because it was asbestos.
by john.whiting
Tue Sep 10, 2019 11:49 pm
Forum: Ariel Talk
Topic: QD hub dismanteling
Replies: 16
Views: 1296

Re: QD hub dismanteling

I would say yes,pressed together.........Ive just done a similar job with Enfield wheels on a Panther.....a prewar Panther/ Enfield and a 1954 Connie rear were ground to exactly the same dimensions.........but be careful to get the hole alignment correct,or your spoke pattern will be wonky.
by john.whiting
Mon Sep 09, 2019 4:00 am
Forum: Ariel Talk
Topic: Oil not returning KH 500 Twin
Replies: 5
Views: 691

Re: Oil not returning KH 500 Twin

Pour about 1 pint of oil into the motor thru a rocker cover,which should prime the pump,then see if it ends up in the tank.......it will most likely be a matter of priming the pump............gear pumps sometimes take a while to prime if dry.

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