It was more than likely yellow anti-freeze, it's like a luminous yellow when new but will obviously discolour after being pumped around your engine.
If you are saying that the header tank was full up but not the expansion tank, then i would guess a rad flush is needed?
It 'could' be coming out of the thermostat cap because it's overheating due to clogged up pipes?
When it cools down it sucks liquid from the expansion tank to fill it back up.
Shorter trips in traffic would heat up the engine, whereas the longer trip you did would have air cooled the engine as well.
In this climate i normally put the rad flush in, fill up with water then ride with it in for 2 or 3 days, so that it gets time to do a proper job.
Obviously don't do that in winter as the water will be prone to freezing, with no antifreeze in the system.
Then empty out, flush with a hose (you're allowed now) and refill with a good motorbike antifreeze, from a bike shop, i would suggest a ready mixed one. (the yellow one is good stuff)
Don't put any old crap in there because it'll cause it to clog up again quicker in the future.
I'd still go over the jubilee clips on any piping though, make sure they are firmly tightened (not too tight), and also as Fazerider suggested, just let the bike tick over, with the tank safely propped up, and if it overheats, or you have a split somewhere, you'll see where it's coming from hopefully.
If you are saying that the header tank was full up but not the expansion tank, then i would guess a rad flush is needed?
It 'could' be coming out of the thermostat cap because it's overheating due to clogged up pipes?
When it cools down it sucks liquid from the expansion tank to fill it back up.
Shorter trips in traffic would heat up the engine, whereas the longer trip you did would have air cooled the engine as well.
In this climate i normally put the rad flush in, fill up with water then ride with it in for 2 or 3 days, so that it gets time to do a proper job.
Obviously don't do that in winter as the water will be prone to freezing, with no antifreeze in the system.
Then empty out, flush with a hose (you're allowed now) and refill with a good motorbike antifreeze, from a bike shop, i would suggest a ready mixed one. (the yellow one is good stuff)
Don't put any old crap in there because it'll cause it to clog up again quicker in the future.
I'd still go over the jubilee clips on any piping though, make sure they are firmly tightened (not too tight), and also as Fazerider suggested, just let the bike tick over, with the tank safely propped up, and if it overheats, or you have a split somewhere, you'll see where it's coming from hopefully.
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