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by john.whiting
Mon Sep 09, 2019 4:00 am
Forum: Ariel Talk
Topic: Oil not returning KH 500 Twin
Replies: 5
Views: 718

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.
by john.whiting
Mon Sep 09, 2019 12:33 am
Forum: Ariel Talk
Topic: Oil not returning KH 500 Twin
Replies: 5
Views: 718

Re: Oil not returning KH 500 Twin

You cant see the oil returning in the round shape twin oiltank.........but if the level is rapidly going down with the engine running ,then its not returning.....conversely ,if the level is OK ,then oil is returning OK........it wouldnt have oil pressure for more than a very short time,as the pump d...
by john.whiting
Sun Sep 08, 2019 6:56 am
Forum: A Bad thing happened to my Ariel
Topic: "That hasn't happened before . . ."
Replies: 24
Views: 1762

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

As they are turned bolts,you could get Acme to make you some with oversize shanks ,and ream the holes in sprocket and wheel so the oversize bolts are a drive in fit......I would also "glue" together the sprocket and hub,and slop the bolts with loctite......My usual cure is to go to the nex...
by john.whiting
Sun Sep 08, 2019 6:43 am
Forum: Ariel Talk
Topic: 1948 Iron 4G Coil Ignition
Replies: 67
Views: 5626

Re: 1948 Iron 4G Coil Ignition

The normal cam for two breaks per rev is a round with two flats opposite sides.........seems the maker just ground two lobes off a four, and as you say,its causing the coil to overheat.
by john.whiting
Wed Sep 04, 2019 6:48 am
Forum: W/NG General
Topic: WNG vid on Bike Shed
Replies: 6
Views: 2371

Re: WNG vid on Bike Shed

He says the forks are all cockeyed......must be Indian.............if I gather correctly,its a rigid VH,with a NH engine,later tank ,and girder forks made in Madras,all painted green and a number on the tank......the only part thats WNG is wishful thinking.
by john.whiting
Wed Sep 04, 2019 6:44 am
Forum: Main Chat Forum
Topic: high carbon build up
Replies: 12
Views: 772

Re: high carbon build up

Might be the carbon storage we are always hearing about.
by john.whiting
Wed Sep 04, 2019 6:42 am
Forum: Ariel Talk
Topic: VALVE TIMING
Replies: 9
Views: 780

Re: VALVE TIMING

J.A.P V twins have five keyways cut in the timing pinion.
by john.whiting
Tue Sep 03, 2019 12:31 am
Forum: Four stroke
Topic: New VB piston
Replies: 17
Views: 895

Re: New VB piston

I checked my reboring notes from the 70s........the Dodge piston is a very close match,deck height correct,size is 3 7/16"( std= .035 O/S for VB),pin size 55/64"....about 050" os,weight is a bit heavier ,but the skirt is also a bit long and can be trimmed.......I havent done any of th...
by john.whiting
Mon Sep 02, 2019 9:12 am
Forum: Ariel Talk
Topic: 1948 Iron 4G Coil Ignition
Replies: 67
Views: 5626

Re: 1948 Iron 4G Coil Ignition

You have replaced coil and capacitor,checked all the circuits,so its down to timing now........either the firing order is wrong,or the timing is ...........possibly 180 deg out..... if 180 out,just swap leads on the diagonal.
by john.whiting
Mon Sep 02, 2019 6:54 am
Forum: Main Chat Forum
Topic: high carbon build up
Replies: 12
Views: 772

Re: high carbon build up

The carbon may be from over rich mixture......modern petrol has lots of aromatics,polycyclics, and ring compounds that typically break down into carbon easier than 40 years ago.

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