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by adrian.hannam
Thu Apr 09, 2020 5:26 am
Forum: Ariel Talk
Topic: Making the 650 HunterBird
Replies: 67
Views: 7419

Re: Making the 650 HunterBird

From the index page, you can see how many views a topic has had, this one 777 so far. Also, the red icon on the left of the topic is animated when the topic is hot.
by adrian.hannam
Sun Apr 05, 2020 10:16 am
Forum: Four stroke
Topic: Mk 1 Sq 4 Valve timing.....again
Replies: 8
Views: 1138

Re: Mk 1 Sq 4 Valve timing.....again

Hi TJ, I have just been through this too. The timing mark on the small sprocket is a tiny notch. I have put a white circle around it. Rear Crank keyway pointing down TJ.jpg To alter the timing by 5 degrees, you need to keep the cam on the chain in the same spot, move the crank sprocket one way or th...
by adrian.hannam
Sat Mar 21, 2020 2:52 am
Forum: Four stroke
Topic: SQ4 how to advance valve timing
Replies: 9
Views: 1342

Re: SQ4 how to advance valve timing

John: I can't say for sure when they were done, or how much use they have had, except that they have obviously been built up with weld. This motor was serviced by about 20 years ago. It covered 2500 miles in the first 2 years and has stood since. For David: I find the peak cam lift (in crankshaft de...
by adrian.hannam
Thu Mar 19, 2020 5:17 am
Forum: Four stroke
Topic: SQ4 how to advance valve timing
Replies: 9
Views: 1342

Re: SQ4 how to advance valve timing

I have done a survey. Without moving the crank sprocket, and moving the cam by 1 tooth either way, the resulting change is +/- 25deg. According to the notes it should be 13 deg. Why is this? timing.PNG I can't achieve satisfactory timing with sprocket and cam adjustments. (I couldn't reproduce 108de...
by adrian.hannam
Thu Mar 19, 2020 4:04 am
Forum: Four stroke
Topic: Club Rods are tight
Replies: 20
Views: 2671

Re: Club Rods are tight

For my new rods, measuring the big ends without shells, all IDs were smaller than 1.5". The smallest one I measured was 38.025mm = 1.497"
The old rods all measured 38.11mm +/- 0.02mm, = 1.5" +/- 0.0005.
I only measured up-down and I am pretty heavy handed with a mic.
by adrian.hannam
Wed Mar 18, 2020 9:28 pm
Forum: Main Chat Forum
Topic: New Member
Replies: 15
Views: 2074

Re: New Member

We have an Australian club, you can make some good contacts and put wanted ads in the magazine.
https://www.australian-ariel-register.com/
by adrian.hannam
Wed Mar 18, 2020 4:02 am
Forum: Main Chat Forum
Topic: Square Four Hydraulic lock
Replies: 5
Views: 957

Re: Square Four Hydraulic lock

I once had an engine that got harder and harder to kick over. When I began to take a screw out of the timing cover a fart came out through the screw hole. Can you check if your crankcase is pressurised?
by adrian.hannam
Tue Mar 17, 2020 12:33 pm
Forum: Four stroke
Topic: SQ4 how to advance valve timing
Replies: 9
Views: 1342

Re: SQ4 how to advance valve timing

Hi David, Yes I hope very much to go to the rally. Yes that makes sense. I removed the rockers, which has helped. I discovered my crank sprocket datum mark is in a different position to what is shown in the literature. This was very confusing. I was warned, Simon has one too. Using the datum mark re...
by adrian.hannam
Mon Mar 16, 2020 3:20 pm
Forum: Four stroke
Topic: SQ4 how to advance valve timing
Replies: 9
Views: 1342

SQ4 how to advance valve timing

There are good notes about this subject, downloaded from Drags, written by Bruce L. Also available is Keith's procedure here: http://forum.arielownersmcc.co.uk/viewtopic.php?f=4&t=9748&hilit=square+four+timing The advice as I understand is to improve max valve lift angle to between 100 and 1...
by adrian.hannam
Sun Mar 15, 2020 7:01 am
Forum: Four stroke
Topic: Sq4 Timing sprockets
Replies: 9
Views: 1226

Re: Sq4 Timing sprockets

Installed the snubber, much improved. I need to develop a bit more mechanical nous, should have been able to solve that one myself. Later when I have lube set up I will turn it over with a power drill and see if it still snatches. Now I am plotting valve lift, get set for more stupid Q's.

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