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by pauldridge
Fri Sep 04, 2020 2:23 pm
Forum: Four stroke
Topic: MkI Square Four fine tuning and performance troubles
Replies: 10
Views: 709

Re: MkI Square Four fine tuning and performance troubles

It certainly sounds like your engine performance is abnormal. My own MK II, rebuilt just 1300 miles (and 1.5 years ago) has never had such anemic performance. Even during break in, I frequently got speeds up to 100 kph, and now she is very happy to go well beyond that. I respect the old gal's age, s...
by pauldridge
Sun Dec 08, 2019 4:56 am
Forum: Ariel Talk
Topic: Trying to identify this bike
Replies: 3
Views: 612

Trying to identify this bike

I was contacted via our Ariel North America website by a fellow from Argentina, who has acquired this bike, and is asking if anyone can identify it (i.e. year and model). The only comment I've received so far from US members is that it looks to be a "bitsa". Any intelligence would be appre...
by pauldridge
Tue Jun 18, 2019 3:48 am
Forum: Four stroke
Topic: Square Four MkI - first rides after restoration
Replies: 31
Views: 9420

Re: Square Four MkI - first drives after restoration

Hi Gui, I am pleasantly surprised to learn you have recovered from the too-tight end float so quickly, and congratulations on getting the old gal back on the road. As Simon and others suggested, I soldered a small bit of brazing rod into the slot on the air mixture screw. I was able to find a rod of...
by pauldridge
Sun Jun 16, 2019 8:34 pm
Forum: Four stroke
Topic: Square Four MkI restoration complete - almost....
Replies: 72
Views: 8780

Re: Square Four MkI restoration complete - almost....

That's great news Gui. I found my own Mk II smoked and leaked like crazy for the first 50-100 miles or so, and seemed to be running hot. Now, with 800 miles on the clock, oil leakage is minimal and the engine seems to be running at a happy, moderate temperature. Now get out there and log some miles ...
by pauldridge
Thu May 30, 2019 5:58 am
Forum: Four stroke
Topic: FITTING DRAGONFLY OIL FILTER TO 1938 SQ-4
Replies: 2
Views: 797

Re: FITTING DRAGONFLY OIL FILTER TO 1938 SQ-4

Ralph
I have installed the filter kit on my mk II, don't know how similar your crankcase would be to mine but would be happy to take pics if it would help
PM me
by pauldridge
Thu May 30, 2019 5:36 am
Forum: Four stroke
Topic: Shock absorber knocking
Replies: 56
Views: 6557

Re: Shock absorber knocking

My recently rebuilt mk II engine with Morgo pump tops out at 70 PSI and pretty much stays there at cruise rpm even after warm. I believe the Morgo has its own regulator internal. 70 seems to have no adverse effect but 100 PSI seems pretty excessive
by pauldridge
Wed May 15, 2019 10:44 pm
Forum: Four stroke
Topic: Square Four MkI restoration complete - almost....
Replies: 72
Views: 8780

Re: Square Four MkI restoration complete - almost....

I guess it could have been much worse, but still not fun having to strip your entire engine. nevertheless, it always goes quicker the second time around! I had similar difficulties finding someone here in the states that can competently line bore those bushings, there seems to be just one guy left i...
by pauldridge
Mon May 13, 2019 12:19 pm
Forum: Four stroke
Topic: 2 1/2 Year Mk II Restoration.. it's a wrap!
Replies: 4
Views: 925

Re: 2 1/2 Year Mk II Restoration.. Solo Seat

My bike came with the standard dual seat, but I just felt a British bike of this vintage cried out for a solo seat (The original tandem is safely stashed up in my attic for the next owner!). When I went to fit the new solo seat, it was clear that the "stock" position wasn't going to comfor...
by pauldridge
Mon May 13, 2019 12:17 am
Forum: Four stroke
Topic: 2 1/2 Year Mk II Restoration.. it's a wrap!
Replies: 4
Views: 925

2 1/2 Year Mk II Restoration.. it's a wrap!

Today I installed the new plunger springs on my '53 Square 4. The old ones had settled to the extent that I was dragging my silencers during tame leaning turns. As a stop gap measure, I added 3/8" aluminum spacers above each spring, which did, in fact, raise the frame height noticeably, but als...
by pauldridge
Sun May 05, 2019 7:17 pm
Forum: Four stroke
Topic: Square Four MkI restoration complete - almost....
Replies: 72
Views: 8780

Re: Square Four MkI restoration complete - almost....

That all sounds very familiar! First time I test rode my bike it wouldn't shift from 1st gear. Turned out I had replaced shift lever too low

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