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by john.whiting
Wed Apr 24, 2019 7:02 am
Forum: Four stroke
Topic: Square four Mk2 valve collett
Replies: 3
Views: 80

Re: Square four Mk2 valve collett

In answer to your other question...make a collett from 4140HT...........i hesitate to say this ,but assuming correct assembly,a common cause of dislodged collets is over revving .
by john.whiting
Wed Apr 24, 2019 6:57 am
Forum: Four stroke
Topic: Square four Mk2 valve collett
Replies: 3
Views: 80

Re: Square four Mk2 valve collett

A broken collet should stay put.............the only exception I can think of is some Ford motors had loose collets so the valves could rotate freely.........nevertheless,any collet trapped in a tapered cap ,will stay put ..........there is some other problem here ,and I suggest you identify it ,bef...
by john.whiting
Tue Apr 16, 2019 9:35 am
Forum: Main Chat Forum
Topic: Daily Fixing and Riding Diary on an Ariel 2019
Replies: 163
Views: 7942

Re: Daily Fixing and Riding Diary on an Ariel 2019

a scotsman in a kilt riding a motorbike!
by john.whiting
Mon Apr 15, 2019 2:11 pm
Forum: Four stroke
Topic: Sq4 bearing removal
Replies: 6
Views: 204

Re: Sq4 bearing removal

That is why a guillotine puller is so called ...it has sharp edges which can be forced into the radius of a bearing race ,separating the bearing from whatever is close up behind it.You could also cut the cage,remove the rollers,and clamp the puller into the thrust shoulder of the bearing...............
by john.whiting
Mon Apr 15, 2019 12:19 pm
Forum: Four stroke
Topic: Burman GB gearbox
Replies: 25
Views: 5582

Re: Burman GB gearbox

Both Triumph and Norton replacement gear bushes are sintered material,and smaller diameter than the Burman bearings..........if you use solid bushes ,you better keep the oil level up,cause they will seize hard,and lock up the box.
by john.whiting
Mon Apr 15, 2019 10:04 am
Forum: Four stroke
Topic: Sq4 bearing removal
Replies: 6
Views: 204

Re: Sq4 bearing removal

It probably simpler to pull the gear and bearing together.......with a 3 leg puller.To pull only the bearing,use a two piece guillotine type bearing extractor and a puller and legs to suit the extractor threads........dont use Chinese rubbish,go for OTC ,or something like .I prefer to use a hydrauli...
by john.whiting
Sat Apr 13, 2019 12:42 pm
Forum: Ariel Talk
Topic: What happened to the Ariel Grand Prix racer?
Replies: 15
Views: 370

Re: What happened to the Ariel Grand Prix racer?

i think times were pretty tough in the decade before the great war.........there were two major financial panics in the US in that time........anyway,I read that the Ariel car was somewhat copied from the Lorraine Dietrich,but Sangster chose to go with shaft drive ,when the French car was chain driv...
by john.whiting
Sat Apr 13, 2019 10:04 am
Forum: Four stroke
Topic: Lathe user?
Replies: 5
Views: 320

Re: Lathe user?

You need 4140HT....this will have the strength needed to get a sufficient torque on the retaining nuts to hold the axle in place,without threads distorting...........it is easy to machine ,and quite cheap,and being hardened and tempered ,needs no further attention.
by john.whiting
Sat Apr 13, 2019 2:07 am
Forum: A Bad thing happened to my Ariel
Topic: Primary chaincase disaster
Replies: 23
Views: 1039

Re: Primary chaincase disaster

As much as I dislike modern mods on old bikes,I think a belt primary drive on an Ariel might be an exception............still ,a primary chain bustup takes my mind off the millenial drivers playing with phones while I'm out riding.
by john.whiting
Sat Apr 13, 2019 2:02 am
Forum: Four stroke
Topic: FITTING SQUARE FOUR ENGINE INTO FRAME
Replies: 3
Views: 199

Re: FITTING SQUARE FOUR ENGINE INTO FRAME

Too true ....the days of struggling with no equipment are long. gone.........for a few dollars ,you can get engine cranes ,elevating platforms ,and every kind of tool imaginable.Most bike restorers now have more stuff than a commercial motorbike mechanic had in the sixties, someone who worked every ...

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