openspaceman

I thought the taperlok and pulley would have enough inertia

My agreement with the donor was not to profit from it, hence freegle

Yes I realised that but was thinking of having the belt twisted through 90 degrees and running a car alternator and small battery as a jump starter. No question of selling it as it cost me nothing and was to give me something to play with, I'll cut the grass a few times and freegle it

Is this the ground penetration radar being developed by the west london uni?

I meant radial load

In practise I don't know but logically this will only lose you the tip growth and as epicormic shoots will cease to be inhibited any replacement growth wood be on these new branches. The thing is for any given combination of growing conditions and plants once the canopy closes the total yield of biomass is the same for a given area, also the height growth is related to this general yield per area. With a coppice stool this growth is shared between all the stems, so they compete with each other for height growth and the increment is shared between them. To concentrate the increment i.e. to get the increment onto fewer stems the coppice would be stored back to (normally) one stem. Making fatter stems is the reason behind thinning in conventional sylviculture.

Okay that makes sense and looks right. I have no use for a mower so can this engine take any axial (side) loading from a belt and pulley?

I've just been given a little used sovereign push along mower with this engine as a project, it hadn't been used for several years and was said to be a non runner. It had no oil in the sump and seemed a little stiff to turn over until I realised the dead man's handle has some sort of brake on the engine, anyone know what it acts on? Anyway with fully synthetic 5W engine oil and aspen 2t (that's the only engine oil and fuel I had) it started on the second pull.

It's a plant nappy, most places that sell spill kits have them. They are expensive and I would use a liner of a few oil spill squares inside it. On all but the most rigorously audited sites I'd use a drip tray with oil spill squares as a cheaper option.

Or a hose burst valve with a small hole in the flat face, about 10 quid from flowfit.

Wow I wouldn't have expected Alan to go high tech

Maybeso but I don't remember a bad ride, seating was good for me and the door window height was lower and preferable to the P100. I live in the sunny south so heater was not a problem and I fitted a hitachi radio. The fuel economy wasn't good at about 32mpg on diesel and probably around 20 mpg with a petrol one but it carried a full tonne and the lsd meant it wasn't bad on a track or with one wheel on a wet verge.

Sad news, my condolences and best wishes for his family

That makes two of us then, especially with a direct injection engine if diesel.

I cannot remember it being a problem when Tom Osborn fitted a ford 6d?? engine to my 1124, they may have swapped flywheels. Of course that is an IPTO rather than dual clutch. The comments made at the time were that the engines destined for tractors were better balanced than truck engines (which were mounted on rubber rather than solid) but I didn't notice the difference.

For the last 40 years I have stored my firewood, for personal use, in a stack adjacent to my garage, it's only in the last ten years that I've considered this to be a mistake so tend to cover it with plastic sheet after September. I should put a roof over it. It also doesn't get the airflow necessary to dry it in a summer season so I end up with bits in the middle of the stack and difficult species to dry, like oak, that are still 30% by the time I want them. This is why I like alder and sycamore as they dry so quickly.

Yes you are right and my explanation was bad, the maximum temperature is with the stoich combustion but it completes soon after tdc, so the hot gases expand after completion and in pushing the piston down to do work they cool as they expand. The heat of combustion goes three ways, about 25% is converted to motion and most of the remainder goes out the exhaust. As you rightly say a weak mixture burns slower, in the extreme it is still burning as the exhaust port is open, this means that as piston is already travelling down heat is still being produced and it expands over a shorter period and so less of the energy goes into pushing the piston down. The heat still has to go somewhere and it is rejected both to the exhaust and the cylinder, I was wrong to say the exhaust gas would be no hotter but the main point is more heat goes to the cylinder which leads to break down of lubricant and seizure. Conversely I don't think the heat absorption of the extra fuel is as significant as the fact that with a two stroke and simple carburation the over rich mixture 4 strokes (doesn’t fire on every stroke as the previous combustion hasn't burnt and scavenged well so the mixing of this and the fresh charge won't fire with the spark, the next cycle clears the way for a fresh charge which them burns on the 4th stroke) and this limits revs. No too much scotch, see above, the point being to the OP that its hot engine rather than hot exhaust that is the problem with a weak mixture and his hot exhaust is probably nothing to worry about if his spark plug colour looks good and the engine isn't over revving.

Running weak causes more heat to be rejected into the cylinder, it doesn't affect the temperature of the exhaust gas which is maximised at full chat with over 500C at stoichiometric fuel:air ratio.

Yes and whilst the rain may not soak in and the surface will dry soon all that time the wood's natural drying is suspended. I think most firewood businesses recognise they are selling a luxury good and it demands good presentation, wood that has been re wetted and dried over a period soon looks mottley.

Seems a bit tight. I guess you can get away with a tighter clearance on a 2t where each time the piston comes up it is under compression but on a 4 stroke with the piston flying up on the exhaust stroke all the bearings and conrod will be under tension as they slow the piston to tdc.

This makes some sense in that the saw rarely idles in forestry for long periods. It's only when idling that the needle bearing moves relative to the crank. The bit about the chain brake is intriguing in that it probably exerts an off centre load on the clutch drum which is transmitted to the bearing. I'm afraid I'm from the generation that doesn't apply the chain brake routinely whilst working. Also full load stalls will heat up the clutch and potentially melt the bearing plastic cage. We had several MS261s but I only had to deal with 2 with this bearing problem, one was rebuilt under warranty and the other didn't damage the crank but the rim was changed to a sprocket (or vice versa I cannot remember)

One on a Stihl and one on husky, yes I know the guarding is inadequate

It almost certainly not insurmountable, I was trying to show an example of something similar that is in use. Some things are insurmountable, an example being my non-patented stump burner from the mid 70s, it worked, was uninsurable and overtaken by more stump grinders available which were considerably faster. The thing to consider is what size of market you expect. We confidently expected to place 16 wood drying kilns into the firewood industry but we only managed one, others came later to the market and did far better.

You don't need a CE mark unless you place the equipment on the market or provide it for others to use in some way. To be able to CE mark something you need to get a make a declaration of conformity showing that it conforms to all the relevant directives, not an easy task as it gets quite involved. There are firms which will do it for one of you arms and legs. How does that compare with pouring a few tonnes of molten steel into a ladle and then into moulds? The point is you assess the hazard and come up with an engineering solution and risk assessment. The rules aren't there to prevent trading but to make things as safe as practicable plus benefit the hoards of ambulance chasers and holier then thou safety experts if you get it wrong

Do you mean the gearbox rotates on the shaft? I have had to fix this on several brush cutters and if the clamping bit is cracked I use an exhaust clamp over the lot.