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by david.anderson
Tue Mar 17, 2020 9:29 pm
Forum: Main Chat Forum
Topic: Square Four Hydraulic lock
Replies: 5
Views: 395

Re: Square Four Hydraulic lock

The only way that hydraulic lock can occur in an engine is when a cylinder is filled on the compression stroke with a liquid and that would be petrol. As liquids are non-compressible you experience hydraulic lock. Gases are compressible and cannot cause an engine to lock. ‘Hydraulic’ refers to a liq...
by david.anderson
Mon Mar 16, 2020 10:11 pm
Forum: Four stroke
Topic: SQ4 how to advance valve timing
Replies: 9
Views: 546

Re: SQ4 how to advance valve timing

Adrian If you have measured your inlet centreline at 108atdc (standard keyway valve timing) and you want to move it to between 100 and 105atdc then you need to advance the cam by about 5 degrees. If you re-engage the sprocket to the keyway on the left of tdc then you will advance the cam by 5.5 degr...
by david.anderson
Mon Mar 16, 2020 8:59 pm
Forum: Main Chat Forum
Topic: Square Four Hydraulic lock
Replies: 5
Views: 395

Re: Square Four Hydraulic lock

If your bike has indeed suffered hydraulic lock, it has nothing to do with oil in the timing chest. The extended breather pipe sounds correct for a mk2. Hydraulic lock is caused by a cylinder full of fuel from a flooded carburettor. Any attempt to kick over a hydraulically locked cylinder will have ...
by david.anderson
Tue Mar 10, 2020 6:39 am
Forum: Four stroke
Topic: Club Rods are tight
Replies: 20
Views: 942

Re: Club Rods are tight

John said if you fit 002 shims between cap and rod both sides, then bore the tunnel 002 oversize, you get a free(er) fit of the bearing at the parting line... But that is not possible with club rods as the rod and end cap mating surfaces are corrugated. (or at least the original batch which my rods ...
by david.anderson
Wed Feb 19, 2020 8:47 am
Forum: Four stroke
Topic: F cam reprofiling
Replies: 38
Views: 3682

Re: F cam reprofiling

Michael The P2 cam (equivalent to 1954HS mk1 cam) will not give a lumpy engine, but will idle well and give a considerable increase in mid range performance. I have not used a mk3 cam on the road. The 2 cams have similar valve timing and duration however the P2 cam has a lot more lift. (.034”) The t...
by david.anderson
Tue Feb 18, 2020 8:40 am
Forum: Four stroke
Topic: Adding an additional clutch plate
Replies: 11
Views: 957

Re: Adding an additional clutch plate

Very interesting with regards to the wear. I mentioned in a post a few years ago that the clutch in my first 57VH had the ferodo ring rivetted to the outer hub, and the later inner hub without the lip was fitted, along with ferodo plates. The wear on that inner hub is negligible and it has done well...
by david.anderson
Mon Feb 10, 2020 8:31 am
Forum: Main Chat Forum
Topic: Sleepless Night
Replies: 50
Views: 2737

Re: Sleepless Night

Steve Well it is normal in eastern Australia for a drought to be broken by floods, and that may well be what happens again. While the drought may not yet be broken, we have received a huge amount of rain. I am not sure how much I have received here other than I have emptied my rain gauge twice when ...
by david.anderson
Sat Feb 08, 2020 3:44 am
Forum: Ariel Talk
Topic: Mystery SQ4 engine number
Replies: 21
Views: 1046

Re: Mystery SQ4 engine number

Adrian I have never heard the V ___ P before and have never seen an engine number with such a large font. I would have no reason to doubt Nev on that one. As the Victorian State Police used square 4s it is even possible that the crankcases were replacement cases for a police bike. After all we know ...
by david.anderson
Fri Feb 07, 2020 8:44 am
Forum: Main Chat Forum
Topic: Sleepless Night
Replies: 50
Views: 2737

Re: Sleepless Night

I would like to thank you all for your well wishes. It looks like the fire threat is now over. And finally my home phone and internet have been restored. A coroded line about 2km away The predicted fire threat on the 1/2/20 did not eventuate. While the temperature did reach 40c, there was virtually ...
by david.anderson
Wed Jan 29, 2020 4:55 am
Forum: Ariel Talk
Topic: Balance factor
Replies: 8
Views: 823

Re: Balance factor

Brenton in a Val Page interview he mentioned that the Hunter line of singles were balanced to 65%. The advice to me from Claude Cartledge was 66% while John Shanks suggested 66 - 70%. I have generally balanced 2/3 or 66.6% and have never experienced much in the way of vibration. My lowest geared bik...

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