I know this has probably been kicked the ass out of, but I haven’t found any kind of satisfying answer. Is there a good road/trail tyre that stands out? I’m not talking motoX. Just good trail/green lane type knobbly. Money isn’t really the question, quality is...
Please give recommendations on performance, not points for style It needs to stick to a road but offer some realistic kind of mud traction...
I’d really, really, appreciate any views on this...

The small oring in the gasket set is for the metal coolant pipe. It goes on the end that mates to the pump. Mysteries solved!...

Sorry, I meant excessive. 2strokes normally have some staining at the exhaust port don’t they? Due to the back pressure from the exhaust?
I usually think of blow by in 4 strokes, when you get gases chugging out the breather pipe caus the crankcase is over pressurised...

Gotchya, the wear is so even it should be straight forward.
The Haynes I have says to use ‘judicial’ filing. Does that mean I have to wear a grey wig and robes

Sorry to rehash an old thread, but it’s a good question. It’s the first thing I wondered on when I first got my dt.
It’s an air expansion hole. There is a sizeable enough air void inside that is opposite where the hot coolant goes to the water pump. If it was closed the air would expand, into the crank or outwards if the crankcase seal failed...
I only worked it out when I split the cases...

I think so but ain’t sure. I need to lower it for sure. I just need to know what’s standard to take it from here...

Sorry again 10cm

I’ve searched and found nowt. Can anyone tell me what the standard is?
I have 11cm links and it’s just too high for my old hips. Anyone got any standard or lowering links, let me know please...

Oh yeah! Could it be needing a decoke? PV sticking in the bushes maybe?...

Is it possible to remove the pulley cover and watch what is actually happening? Might be a dumb question but I don’t have a servo powered valve...

Dt’s don’t die! They just slowly fade away (if they’re treated right) any 2 stroke does.
Which is the issue, did the power loss come on slowly over time or just happen? Slowly would suggest normal wear to rings like the man said...
I’m wary of anything that claims to fix without work. Apart from that teralyne/whatever they pump through 4 strokes. But 2T are different, like you say, anything that breaks down carbon is not likely to be lubrication friendly to your bearings...

Hey! You weren’t wrong, there is a paper gasket. I was wrong about the oring though. It’s to big for the coolant pipe

The small oring in the gasket set is for the metal coolant pipe. It goes on the end that mates to the pump. Mysteries solved!...

Sorry it’s 27mm Inner Diametre X 2.5 or 3mm Cross Section.

Calum, cheers for the info bud, it puts my mind to rest. I always worry more when learning a new engine...

Same as in my gasket set, it’s to small. You need a 33mm one for the thermostat. Get one from eBay. If you don’t have an account someone here will probably order it for you. It’ll be pennies ...