Search found 1666 matches

Go to advanced search

by john.whiting
Tue Sep 22, 2020 8:02 pm
Forum: Four stroke
Topic: Ariel 4F/600 - 1932 engine
Replies: 4
Views: 124

Re: Ariel 4F/600 - 1932 engine

Karol ,I believe you are asking about alignment of the pressed up crankshaft......I would expect it to run within .001" TIR,and as close to zero runout as possible.......I think anyone who could do this type of crankshaft work on an outboard boat motor could do similar work on the 4F cranks.......
by john.whiting
Fri Sep 18, 2020 12:42 am
Forum: Four stroke
Topic: A corner for VBs (and other sidevalves)
Replies: 11
Views: 368

Re: A corner for VBs (and other sidevalves)

I did some experimentation about 20 years ago with increasing compression in iron head SVs,and while power does definitely increase,the engine also runs rougher,very noticeably so,and I think this is a turnoff.The engine I used was a stationary twin coupled to a DC generator ,and so easy to measure ...
by john.whiting
Thu Sep 17, 2020 12:46 pm
Forum: Main Chat Forum
Topic: Dragonfly clutch plates
Replies: 15
Views: 500

Re: Dragonfly clutch plates

Of course,the point is 1950s Ariels dont have wet clutches ,wheras most other bikes do .This is an important difference with cork,which lasts indefinitely when run oil wetted ,but not when run dry....Another bike that runs dry is the old Army Beeza,where the clutch has an oil tight hat to keep oil o...
by john.whiting
Mon Sep 14, 2020 10:30 pm
Forum: Four stroke
Topic: Horrible clutch!
Replies: 14
Views: 473

Re: Horrible clutch!

Also worth checking if your clutch plates are flat ,and if not, make them flat ,or replace them.
by john.whiting
Wed Sep 09, 2020 1:32 am
Forum: Four stroke
Topic: quill in timing cover - singles
Replies: 8
Views: 288

Re: quill in timing cover - singles

The way to stop oil from coming out the timing gear end is to have a small lip on the hole ,the oil will be in a thin layer along the hole ,and a lip only needs to be a few thou high to direct the flow entirely to the flywheel end...this is why the instructions say to be sure the quill doesnt contac...
by john.whiting
Wed Sep 09, 2020 1:23 am
Forum: Four stroke
Topic: Iron 4G Coil Ignition Conversion.
Replies: 7
Views: 522

Re: Iron 4G Coil Ignition Conversion.

I f you want to run coil ignition type current loads through the mag,I suggest you make the brushes from a copper/graphite material more suitable than the carbon used in the magneto ignition......These are everywhere from power tools ,starter motors etc ,and just need to be trimmed to size......If u...
by john.whiting
Tue Sep 08, 2020 6:33 am
Forum: Four stroke
Topic: quill in timing cover - singles
Replies: 8
Views: 288

Re: quill in timing cover - singles

When the motor is running ,the flywheel oil passages act as a centrifugal pump ,and at some revs ,more oil is pulled in, than the oil pump feeds into the system .....this is demonstrated in the Norton Dominators where at around 6000rpm ,oil pressure is observed to drop to zero,with plenty of oil fee...
by john.whiting
Mon Sep 07, 2020 1:13 am
Forum: Main Chat Forum
Topic: I need help identifying Ariel
Replies: 5
Views: 331

Re: I need help identifying Ariel

Yes ,they do have value,and are hard to find .........but are also heavy and cost heaps to freight very far......Here ,a rolling frame with tank would be worth a min of $1000 ,parts sellers on fleabay are asking up to that for just a set of forks .......but the stuff doesnt sell readily at that pric...
by john.whiting
Sun Sep 06, 2020 2:38 am
Forum: Four stroke
Topic: A corner for VBs (and other sidevalves)
Replies: 11
Views: 368

Re: A corner for VBs (and other sidevalves)

Some will note its not a UA,but a civilian bike ,one of only a few hundred made in 1944,and my brother says the front forks are not original ,but the 1947 solo trail type...........Needless to say .the bike is absolutely original otherwise.......and my brother says it would make a barn find knuckleh...
by john.whiting
Sun Sep 06, 2020 2:32 am
Forum: Four stroke
Topic: A corner for VBs (and other sidevalves)
Replies: 11
Views: 368

Re: A corner for VBs (and other sidevalves)

Matter of fact ,its recently been out in the sunlight first time since the 60s........The owner doesnt do computers ,so I got him a "rubber ducky" to replace the crumbled cork one ,cleaned the points ,fuel in the tank ,spray of aerostart,and started third kick like they always do ......Ble...

Go to advanced search