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by john.whiting
Wed Jun 20, 2018 1:17 am
Forum: Main Chat Forum
Topic: Rear stand dimensions for 1950 Rigid Frame.
Replies: 11
Views: 243

Re: Rear stand dimensions for 1950 Rigid Frame.

The bow in the RHS is definitely too small,but I d ask the supplier for a material spec. before doing anything......If the sides are cast in Britain they are most likely ductile/SG iron,which cannot be arc welded (or oxy either) without major problems....If they are cast or forged steel(unlikely),th...
by john.whiting
Sun Jun 17, 2018 3:28 am
Forum: Ariel Talk
Topic: !!WANTED!! Sq4 mk1 left hand crankcase
Replies: 5
Views: 204

Re: !!WANTED!! Sq4 mk1 left hand crankcase

The seller is Central Motorcycles,and they have some interesting stuff on their e- shopsite.Well worth a look.
by john.whiting
Sat Jun 16, 2018 12:38 am
Forum: Ariel Talk
Topic: !!WANTED!! Sq4 mk1 left hand crankcase
Replies: 5
Views: 204

Re: !!WANTED!! Sq4 mk1 left hand crankcase

Might help if you said where you are located.....you might also consider that there is a very finite supply of cases ,and get yours repaired.
by john.whiting
Sat Jun 16, 2018 12:35 am
Forum: Ariel Talk
Topic: NG oil leak, between dynamo and magneto
Replies: 4
Views: 132

Re: NG oil leak, between dynamo and magneto

If there is oil coming out between mag case and dyno,it means your mag end is swimming in oil,affecting the slipping clutch,and shortly the slip ring will be oil soaked,along with the mag insides.Good for the bearings,bad for the electrics.
by john.whiting
Sat Jun 16, 2018 12:25 am
Forum: Four stroke
Topic: JP piston weight reduction
Replies: 9
Views: 356

Re: JP piston weight reduction

I find it ridiculous that you pay way over the odds for a JP piston,then have to reduce the weight by 1/3 to make it usable......Incidentally ,I had a big stack of a kind of piston they make ,probably 200 OEM,all oversizes,and they offered me $5 each for them,provided the boxes are OK.Knocked them a...
by john.whiting
Thu Jun 14, 2018 11:34 pm
Forum: Four stroke
Topic: KH500 oil pressure drop
Replies: 13
Views: 230

Re: KH500 oil pressure drop

And another good reason to fit an oil filter.
by john.whiting
Thu Jun 14, 2018 9:58 am
Forum: Four stroke
Topic: KH500 oil pressure drop
Replies: 13
Views: 230

Re: KH500 oil pressure drop

Certainly sounds like a relief valve not seating,probably due to a bit of grit or something on the seat.Or maybe the valve spring is bent and sticking .It is amazing how long a plain bearing motor will run with no oil pressure without damage,once its worn in......Nev might remember the guys who used...
by john.whiting
Mon Jun 11, 2018 5:29 am
Forum: Member's Bikes
Topic: The KH project
Replies: 84
Views: 4599

Re: The KH project

I certainly prefer a tap I can see to a valve that I cant.......Ive had enough experience with valve balls sticking on seats in various machines and pumps to not trust one ....Thats one advantage of a Panther,all the oil lives in the sump....but I still check the level before starting......As to my ...
by john.whiting
Mon Jun 11, 2018 5:11 am
Forum: Ariel Talk
Topic: Calculating Balance Factors a simple example
Replies: 18
Views: 396

Re: Calculating Balance Factors a simple example

The simplest way to reduce the pin is to bore it taper from each end,to about where the gap between rod and boss is......that way the pin isnt weakened over the load bearing area.Ive found ordinary TiN coated inserts on an ordinary boring bar are OK.......It often helps a lot with case hardened stee...
by john.whiting
Sun Jun 10, 2018 1:16 pm
Forum: Four stroke
Topic: Black Ariel oil consumtion rate ?
Replies: 14
Views: 328

Re: Black Ariel oil consumtion rate ?

What grade of oil.....straight 50 would be good,provided the motor gets hot.

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