Trident 750 Warning Light?

I guess you have checked basics like oil / water levels before you restarted and did it run out of fuel when it conked out?

 

The light you have on is to say the sidestand is in the down position ......... unless the switch has failed or been disconnected.

 

You'll find a Triumph T300 owners hand book here :-

https://www.carlsalter.com/download.asp?p=1956

 

Side stand switch malfunction (as already suggested)?
Shite (technical term!) in the carbs?
If it stops when hot but restarts after it has cooled down then it is symptomatic of cps (crank position sensor) failure.
Just a couple of things to amuse yourself with over the next few days!!

 

I would cut and join the wires as appropriate on the sw3itch side of the sidestand switch plug to make up a shorting plug so you can just plug in a replacement switch at a later date if you wanted to.

I would guess the oil is from the doughnut seal around the plug hole under the rocker cover. order the parts before you take this bit apart in case the seal falls apart when you remove it.

Have a careful look down the plug hole as I have seen the plug located off center in the hole and you will need the correct Triumph plug socket and allen key to get to the plug.

You may still have to file the corners of the plug spanner to get it to fit and go round, Don't ask How I know .

 

If it's not leaking now you should be able to refit the outer gasket without any problems just make sure to add a little sealer around the half moons when you refit them or they will leak .....

 

No they're 18mm, just been and checked ......

 

When you do the rocker box seal check the valve clearances whilst youre in there,

Inlet 0.1 - 0.15 mm
Exhaust 0.15 - 0.2 mm

I would also order a new cam chain tensioner spring from sprint manufacturing all the originals seem to be a bit short on checking

https://www.triumphparts.gbr.cc/product.php/5733499/

Apologies too, rocker gasket is all one piece with the plug hole gaskets

 

Those exact symptoms are the crankshaft sensor failure mode, replacement sensor about £ 50 from
https://www.triumphparts.gbr.cc/product.php/5732908/
including gasket a reasonably straight forward repair.

 

Sensor should read 530 ohm +/- 10% but breaks down under load / temp and recovers when cold until eventual failure.

RHS engine cover near exhaust, will need gap setting between 0.7 & 1mm ( updated figures from triumph was 0.6 - 0.8mm ) from rotor, put a bit of sealer round the grommet when you fit the sensor where it exits the crankcase plug it in refit the cover with new gasket and done

 

That's the one, bike on sidestand should mean you will only loose a tiny amount of oil.

 

No pics ........ what range have you got it set to ?

 

Set the meter to an appropriate Ohms range ( 1k ? ) and touch the probes together, you should get a 0.0 reading, if not and there is no calibration on the meter you need to subtract the reading from any measured reading you may get when testing & taking resistance readings.
You're looking for a reading between 483 ohms & 583 ohms, the closer the readings are to the middle @ 530 the better as the readings change with age.