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by bill.bottrill
Wed Feb 13, 2019 10:51 am
Forum: Main Chat Forum
Topic: Mk 1 spark plug inserts
Replies: 0
Views: 160

Mk 1 spark plug inserts

Bit of a long shot but does anyone know the thread size of the factory fitted bronze inserts on a later square 4 mk 1,or even have one of these removed from a damaged head, Is there a factory drawing of this insert somewhere! bruce suggested it might be 18mm I was expecting it to be whitworth as it'...
by bill.bottrill
Sun Jan 27, 2019 6:53 pm
Forum: Electrics
Topic: Further Dynamo Problems
Replies: 8
Views: 504

Re: Further Dynamo Problems

Yes,you are right,I was probably just going to connect up to the field coil as you did while it was motoring and then rejoin to the D wire.Iazy really,I can't see anyhing wrong with flashing it while motoring (with D and F joined) as it would drive it in the same direction it was turning in the lath...
by bill.bottrill
Sat Jan 26, 2019 4:25 pm
Forum: Electrics
Topic: Further Dynamo Problems
Replies: 8
Views: 504

Re: Further Dynamo Problems

If you can motor it there can't be much wrong with it.When you were driving it from the drill and you applied (12v) to the field coil and it started outputting 7v did you try then rejoining the field back to the D terminaL while it was still being driven and what happened. It's a 6v dynamo isn't it ...
by bill.bottrill
Sat Jan 05, 2019 6:32 pm
Forum: Four stroke
Topic: valve guides
Replies: 8
Views: 557

Re: valve guides

Sorry for the late reply,my son has just come over from ireland Thanks Ralph,that's just the info I need,I didn't want to replace the guides, but the mk 2 smokes so much on tickover I thought I had better start with new for the mk 1,is it possible to put small rubber rings on the valves to stop oil ...
by bill.bottrill
Sun Dec 30, 2018 3:48 pm
Forum: Four stroke
Topic: Square Four Push Rods
Replies: 31
Views: 812

Re: Square Four Push Rods

Gui, couldn't check all the measurements all your measurements check out o.k. except one, top of valve guide to top of valve. you have 20.60 I have 22.19 mm this was checked on the old valve guides still in situ with an old exhaust valve from the same engine overall valve length 88.38 mm top of valv...
by bill.bottrill
Sat Dec 29, 2018 10:37 pm
Forum: Four stroke
Topic: valve guides
Replies: 8
Views: 557

Re: valve guides

Thanks Gui, I will be meeting up with the guy who helped me build up my mk 2 in the next couple of day's,so I will double check with him also.I thought they were just pressed in, there isn't any forces on them but the other set for the mk 1 are held down by the spring so I thought there might be ano...
by bill.bottrill
Mon Dec 24, 2018 5:08 pm
Forum: Four stroke
Topic: valve guides
Replies: 8
Views: 557

valve guides

Hi, I have started to build up my square 4 mk1,I should like to replace the valve guides.Has anyone had a go at this on the forum,is there any notes about, what temp should I take the oven up to, I checked in Waller (I eventually found my copy) he says the springs hold the guides in place! but that'...
by bill.bottrill
Tue Sep 18, 2018 1:22 pm
Forum: Main Chat Forum
Topic: Ho Dear,Whats this for!
Replies: 2
Views: 293

Ho Dear,Whats this for!

SAM_1031.JPG Hi,Can someone tell me what this sleeve is for,I have just started to rebuild my Mk1 square,the crankcase was open for maybe 30 years so it was full of crud.I'm getting on O.K. but I came to clean up the camshaft and suddenly this ring came loose from the timing side,I have misplaced m...
by bill.bottrill
Tue Aug 28, 2018 5:06 pm
Forum: Electrics
Topic: More dynamo issues.
Replies: 15
Views: 1036

Re: More dynamo issues.

Sorry I've hi-jacked your thread, I should have put the above and the previous post under keith's dynamo problem bill
by bill.bottrill
Tue Aug 28, 2018 3:13 pm
Forum: Electrics
Topic: More dynamo issues.
Replies: 15
Views: 1036

Re: More dynamo issues.

SAM_1019.JPG Alan This photo shows you the resistor,sorry I can't put arrows on etc. Can you see it's the round black jobby,to check it you need the fade plug out.one meter probe on the frame (ie V) and the other meter probe on the copper clip or the flat strip attached to it.can you see the points...

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