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by Gui.dorey
Sat Dec 29, 2018 8:32 pm
Forum: Four stroke
Topic: Square Four Push Rods
Replies: 31
Views: 918

Re: Square Four Push Rods

And two more.
by Gui.dorey
Sat Dec 29, 2018 8:31 pm
Forum: Four stroke
Topic: Square Four Push Rods
Replies: 31
Views: 918

Re: Square Four Push Rods

Hi Simon,
The rocker arms are equal lengths. Did think of that as well and had checked them before.

Hi Paul,
As far as I can tell, the parts are correct - collets are 1/4" in length.

Here are some pics. Maybe you chaps can spot something. Measurements are in inches.
by Gui.dorey
Sat Dec 29, 2018 2:25 pm
Forum: Four stroke
Topic: Square Four Push Rods
Replies: 31
Views: 918

Re: Square Four Push Rods

I've got the valves all running freely in their guides now. There was a small burr on the top edge of the guides which was catching on the valve stems. My fault, when I drifted the new guides in and didn't check them properly after reaming. However, I still think I have a problem. I still couldn't t...
by Gui.dorey
Sat Dec 29, 2018 11:06 am
Forum: Four stroke
Topic: Square Four Push Rods
Replies: 31
Views: 918

Re: Square Four Push Rods

Nothing worked, so I disassembled the rockers and found that the inlet valves of Nr 2 and 3 were stuck in their guides. So next the head came off again, and those two valves are definitely not moving for some reason, so will have to disassemble them as well. All other valves are moving fine, althoug...
by Gui.dorey
Sat Dec 29, 2018 8:16 am
Forum: Four stroke
Topic: Square Four Push Rods
Replies: 31
Views: 918

Re: Square Four Push Rods

Hi everyone, Thanks for the replies. I don't think I have the push rods crossed - I checked this thrice before assembling the rods and I do have the circlips on the followers. It seems as if the inlet valves for Nr 2 and Nr 4 are stuck or hitting something. I still haven't assembled the timing chain...
by Gui.dorey
Fri Dec 28, 2018 7:37 pm
Forum: Four stroke
Topic: valve guides
Replies: 8
Views: 587

Re: valve guides

Hi Bill, Did the same not too long ago,but be prepared for a lot of foul language. I put the head in the oven at 150C and was able to drift the old guides out without too much trouble. The new ones were from Drags and they are a tight interference fit. Head back in the oven and the guides in the ice...
by Gui.dorey
Fri Dec 28, 2018 3:43 pm
Forum: Four stroke
Topic: Square Four Push Rods
Replies: 31
Views: 918

Square Four Push Rods

Hello everyone, My engine rebuild is progressing along and I've assembled the head now. Today I assembled the rockers, but I must have done something wrong because the camshaft only turns a few degrees fwd and backwards and seems to get stuck, as if the valves hit something or reach the end of their...
by Gui.dorey
Tue Dec 11, 2018 2:45 pm
Forum: Four stroke
Topic: Square Four single vs duplex timing chain
Replies: 3
Views: 279

Re: Square Four single vs duplex timing chain

Roger, thanks for the quick reply. Drags only has the skew gear for the dynamo shaft, but not the one for the distributor... and I also don't have the large tensioner, only the old one with the spring and blade. I'll probably have to go back to the single chain it seems. I know I have a camshaft spr...
by Gui.dorey
Tue Dec 11, 2018 1:37 pm
Forum: Four stroke
Topic: Square Four single vs duplex timing chain
Replies: 3
Views: 279

Square Four single vs duplex timing chain

Hello everyone, My engine rebuild is moving forward slowly, and now I've come up with the next problem. My bike is actually a MkI, but the previous owner left all the parts for a conversion to a duplex timing chain in the basket - or so I thought. I have a halt time, camshaft and dynamo pinion for a...
by Gui.dorey
Mon Oct 08, 2018 9:02 pm
Forum: Four stroke
Topic: Sq4 MkI engine rebuild-going mad
Replies: 8
Views: 651

Sq4 MkI engine rebuild-going mad

Every day there seems to be something new to drive me mad with this restoration. Serves me right for buying a basket case... It seems I have the wrong sleeve for the engine sprocket/shock absorber. Does anyone recognize this bit? Or where it could come from? IMG_1519.JPG Also can anyone tell from th...

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