QUOTE(budgee @ Nov 22 2013, 08:13 PM)
Was your bike very heavy? How many kg, roughly?
I also thinking about making a trip up.... but worried cannot make it...

One big factor in making a successful hill climb is the total weight of the bike and the rider. Of course, the rider has to be fit too.
Rider weight , we can't do too much. But bike weight we can....
Don't get too obsessive with bike's weight or rider's weight. Fitness, I agree though. Yes, true it may be advantageous for lighter bike and rider but I am almost 100kg and my bike is almost 14 kg and I rode up three time already and the route is still my favourite riding venue. Most important is your own pacing. While others' boast about doing it within 4 hours, you don't have to conform, right? Maybe take the whole day, it doesn't matter. I think more importantly, it's your riding kaki. Just join some who are willing to wait or follow your pace.
If you are still doubtful, try from Sungai Chilling first. From Chilling onwards, it's all gradual uphill for 20 km. Good thing is, you can turn back whenever you want and the turn back is all downhill, so no worries about riding back to the car. From there you can try gradually to complete but I am sure most can complete the 20 km to GAP station. After that, if you think you can make the last 8 km, go ahead. After you manage this part, the next time, start from Kuala Kubu Bahru. Happy riding, friend.