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by nevhunter
Thu Oct 10, 2019 1:16 am
Forum: Ariel Talk
Topic: 1948 Iron 4G Coil Ignition
Replies: 92
Views: 10312

Re: 1948 Iron 4G Coil Ignition

Velocettes are still conventional engines but the K/S doesn't move the engine very fast. If the magneto is OK they start fine IF you have the technique of starting a single covered/learned. Never have your leg dead straight and have the foot so as to enable it to give way to a fast returning pedal, ...
by nevhunter
Wed Oct 09, 2019 12:20 am
Forum: Four stroke
Topic: Crank pressure relief PCV reed and crank oil seal
Replies: 22
Views: 879

Re: Crank pressure relief PCV reed and crank oil seal

The way the PC valve works probably doesn't suit the situation as well as a one way valve especially with a single which has anything but a smooth action, Note how the carb slide rattles back and forth in a single. Lots of engines have had timed mechanical breathers and some have flappers. The large...
by nevhunter
Sun Oct 06, 2019 11:53 pm
Forum: Four stroke
Topic: combined clutch a/r and valve lifter control lever 1938 VH
Replies: 7
Views: 299

Re: combined clutch a/r and valve lifter control lever 1938 VH

IT can be made to work if you get the adjustment of the "funny" hex nut that works on the lower lever, adjusted right. Interestingly the little toggle lifter lever was standardised across war models in the later stages of the war. None of them work as well as the style used on the 1930 mod...
by nevhunter
Thu Oct 03, 2019 4:24 am
Forum: Four stroke
Topic: So it begins
Replies: 63
Views: 4171

Re: So it begins

Bit worrying. Hook up a fitting /hose to a tee in the oil pressure gauge line and externally pressure it. Check all is primed. You can't operate it without some positive oil supply. I like to prime all engines I do before the engine fires up. It's a good practice. Nev
by nevhunter
Thu Oct 03, 2019 4:17 am
Forum: Ariel Talk
Topic: Tire / rim sizes 1937 > 1938
Replies: 7
Views: 377

Re: Tire / rim sizes 1937 > 1938

It might be an error . Most makers (UK) made a" competition" Model mid 30's that usually had a 21" front tyre. Correct me if I'm wrong on that and the tread is Trials Universal pattern which was road use approved.. That's what I finally ended up fitting to my long used VCH The 4.00 re...
by nevhunter
Mon Sep 30, 2019 2:06 am
Forum: Four stroke
Topic: End float W/NG crank
Replies: 3
Views: 159

Re: End float W/NG crank

The shock absorber effectively eliminates the end float. The outer race (small one) on the drive side is circlipped in place, and can't move. I'd stick to the .008" but I don't see it as critical. A hot engine will have more. Center the conrod in the cases. I don't like thin shims sitting aroun...
by nevhunter
Mon Sep 23, 2019 1:39 am
Forum: W/NG Technical
Topic: Flow rate from the oil tank
Replies: 8
Views: 666

Re: Flow rate from the oil tank

Good quality fuel grade pipe won't swell. Some goes harder over time and may leak on a push fit. Replace about every 3 years to be sure to be sure. Good luck you found it. Nev
by nevhunter
Mon Sep 23, 2019 1:20 am
Forum: Main Chat Forum
Topic: petrol tank repairs
Replies: 6
Views: 1476

Re: petrol tank repairs

You have to remove all traces of the brazing if you wish to weld it subsequently. The original tanks are oxy-welded "very capably in many places where thin is welded to thick". When a tank has thin rusty sections and it's easy to overheat them when brazing and the" burned" bits a...
by nevhunter
Wed Sep 18, 2019 1:57 am
Forum: Four stroke
Topic: Square 4 MkI - too lean or too retarded?
Replies: 12
Views: 612

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

IF the insulator is almost completely white I would be worried that the plug is too hot. This will only show up if you ride it hard (er) for about 3 minutes mainly on a long hill) At easy speed and in traffic that hotter plug won't be a problem, but an overhot plug can cause engine damage.. If you h...
by nevhunter
Mon Sep 16, 2019 12:29 am
Forum: A Bad thing happened to my Ariel
Topic: Piston problems Model C
Replies: 5
Views: 453

Re: Piston problems Model C

Insufficient clearance It looks like. Perhaps the day was a bit warmer or your riding a bit more enthusiastic than normal. It takes thousands of miles to wear a bit of extra clearance on the piston and sometimes a piston will "grow " slightly. Don't file off the "heavily"dragged ...

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