BarneyC

Back in 2006 having a couple of slightly smoky Suffolk Punch 75G iron engines one with worn bore and the other with some internal corrosion of the bore I decided to challenge myself to rebore one of the engines. The engine has been running since 2006 and compression is still excellent and no smoke at all. The project was made more difficult by not at the time being able to find an oversize piston or even just oversize rings. I researched other options and eventually found a set of suitable rings which were suitable for a 52mm bore. I have attached a few images, no explanation as I am guessing that anyone who wants to do this probably does not need an explanation? Very important to get the gudgeon pin at 90 degrees to the cylinder. Suffolk punch pistons are not cam ground but they do need to be tapered. I hope someone with one of these engines finds this of interest. You need a lathe with a minimum of 9" swing

A few years ago I converted the 12" Suffolk Colt to scarifier / lawn rake duties. All the conversion work is reversible. I bought a 12" scarifier cassette of the Atco, Allett, Qualcast, Suffolk punch type. The blade was removed from the mower and the deflector from the cassette modified to fit the mower fixing at the top with the existing screws and underneath with bolts from either side threaded into captive nuts on a piece of angle. (A rod with tapped holes either end would be better as the angle collects swarf) When in use the chaff flies nicely into the grass box. The more interesting bit was fitting the scarifier blades. The 16mm shaft from the cassette was too short to be modified so I used a new piece of 16mm bright mild steel shaft and machined the ends to fit deep groove ball bearings either end, I think these were 6202 with external sleeves to match the mower. The right hand end of the shaft was machined to suit the existing chain sprocket. The chain sprocket is driven by the original drive pin and the cassette came with its own drive pins and belleville washers to hold it all compressed together. The picture shows the new drive shaft with centre hole in the end. The deflector lower bolt can also be seen and the some will recognise it as an M8 bolt head where 5/16" would serve equally well!!

Hi All, I am a new member but hope my content is of interest and may inspire others to use their Suffolk punch mowers. I am a fan among other things of Suffolk punch mowers with Suffolk iron foundry engine. I have attached a picture, both of these 75cc mowers are in use, the 14" mower will be refurbished sometime over the next couple of years, the 12" mower has been re-purposed so it has a new life as a scarifier which is what I would like to talk about in a few forthcoming posts. The 75cc iron engine on the 12" has also been slightly modified using my lathe and milling machine, more to follow...