Loss of coolant expansion tank

you have a solution for this problem ?

Check your cooling fan operation? It may be normal for it to puke a little on a very hot day running at low speeds or in stop and go traffic? Mine has done it on occasion.

This problem happens in demanding and high temperature situations .
the coolant level is correct

Don't bother trying to keep coolant in the overflow tank, it will not stay in there.
The heat in that area means it will evaporate out quickly.

As long as you check the level in the radiators regularly you will be fine.

I thought I put the cap in a different location .
perhaps SWM has solved the problem with a different location ?

Nope, they use the same overflow tank.

this is a SWM 650
I do not see the cap of the expansion tank

I wanted to try putting a steel net inside expansion tank to see if the situation improves

It will not, the coolant will still basically boil out of the tank.
I tried all of the fixes 5 years ago, it's not a problem to leave the tank empty.

Look closer, your second pictures shows it at the very left edge.

I gave up years ago with my 510 doing that. Everyone I know with a husky has the same problem. Unfortunately, it's normal for coolant to leak from there.

I thought it was a bad idea to leave the reservoir empty due to possibly melting the tank. The coolant inside the reservoir will keep it from melting.

5 years without a drop of coolant in mine and it's still there looking like new (when it gets cleaned)

Same here- I gave up on leaving a little in it. I wouldn't sweat it.

Strange, mine only does this when I fill it up to the min. mark. It spills out a bit, but then it stays completely dry, no signs of coolant leak.

Some of it depends on the type of riding you do...

I made this change for increase the condensation.
I used a stainless steel mesh.
I also put a small seal of rubber on the stopper
I will try if it works

Problem resolved
No drop is output and the level is half after a long raid offroad with high temperature

Has anyone ever tried putting a fan on the other radiator and running 2 of them ?

I'm sure it could be done, but the overflow tank running dry isn't usually because the radiators boiled over, it's because the heat of the engine causes it to evaporate out of the vented tank.

go to cafehusky and you will find out that nearly every 630 leaks from cap its due to expansion tank being to low and a dodgy cap design no one seems to be able to solve the issue most run it dry. i didt like that idea so after scratching my head to come up with a solusion i took the white bung out the cap and found it not to be sealing on its seat i ended up wrapping the skinny bit of bung the bit with a nob bit on it that holds it into cap with some ptfe tape (think u lot in usa call it teflon tape) to my amazment issue solved 6 months later still all good. to to reitarate iv not blocked the overflow bit just jimmied the white bung so it has no play in it problem solved.
and sorry found that hard to discribe if you want pics let me no its a simple fix but works iv not came across anyone who has solved this issue yet