Asia - Does KUL have a hop on hop off city tour?

Title says it all.

Not that I'm aware of. They have a newish bus ticket system. All day for RM$2, not sure how easy it is to use.

Yes there is one. Google Hop on Hop off KL for the link.
I see it all the time around town. Usually half filled with bored looking tourists stuck in traffic.

Yes, it's a double decker with a back outside viewing area. There are 20 or so stops all around the city and you can buy a ticket good for 24 hours. Never have used it, but it would be an interesting way to get around town.

I believe you can purchase tix onboard. Just look out for the 'hop on hop off' signs in touristy areas.

http://www.myhoponhopoff.com/

Just got back from Malaysia. Here is my experience and trip report, maybe it will help someone else.

Arrived on Thu night KUL used the airport taxi service since the train would be shutting down at 11 and that would not be enough time to make it all the way to the hotel in PJ Hilton. The first rate quoted was 120 ringit, I said no thanks and started to walk off. She then offered 75 MYR and said (but it's not a mercedes) I said I don't care about a Mercedes I want to get to the hotel the cheapest possible way and go to sleep. She then said the cheapest I have is budget and it is 58 MYR. Took it and was zipped away in a taxi that looked exactly like the ones in the Mid priced section. It is a long ride when you are tired to Kuala Lumpur from the airport as the airport is not in Kuala Lumpur and is actually in another town a good 30 plus minutes south.

Got up the next morning and took the train from the hotel station Taman Jaya to the end of the line and then hired a taxi for meter rate from there to the Batu Caves at 7MYR. The caves are covered in Monkeys that are NOT friendly so DON'T try to pet them. Keep your distance, take photos and don't feed them. The climb was 273 steps to the top. There was a lot of construction materials everywhere with no apparent construction going on. But there was plenty to photograph. Prices for drinks were 1.50MYR at the bottom and 2MYR at the top. I got tired of hearing the repeating Dark Cave loudspeaker, but if you have not been in a cave this was not very expensive. Understand that this place has not been maintained or preserved in any way. They have commercialized and painted the walls. This is used as a Hindu temple and that is its main purpose. There are several other tourist traps and even a chinese temple nearby. It is still a must see because of its uniqueness even though a lot could be done to clean this place up. It looks as if there was a furnicular at one time on the left side of the steps, but is long gone. The big statue at the bottom of the steps is impressive as well as the green gin looking statue over to the left. When you get ready to go back they charge a flat rate of 15 MYR and will not use the meter. If you are willing to stand there all day you might find one that will. There is no charge for climbing to the top and seeing the batu caves. When we got back we went to the local mall that is the Amcorp Mall, quite interesting but you will get tired of seeing American Restaurants like McDonald's, KFC, A&W, Kenny Rogers, Pizza Hut, Outback, Starbucks, Subway, etc... Being Diamond we ate in the hotel for free and they had Chicken Satay which was great.

Sat we took the all day tour with Tour 51 that we found at the travel agency in the Amcorp Mall. It was 120 MYR to Malacca which was the same tour offered by the hotel concierge for 250 MYR. This was an all day trip which included a guide in English, A/C bus and Lunch. We got to get off and visit 6 different places including a Portugese Church, Red Church, Monastery, Governors House, Sultans Palace, Budha Temple, Chinese Temple, Muslim Mosque and the Straits of Malacca. They then drop you off in town at your choice of location. We chose sentral station so that we could take a 1.60 MYR train ride back to the station.

SUN we got up and took the train to sentral and then took the Kommuter to Port Klang and then for 17myr we took a high speed a/c ferry to crab island where everything is on stilts and you can get a real feel for how the locals live. We returned the hotel after a 6 hour round trip. We then hired a cab by the hour to take us to the blue mosque, petronas towers, kings palace, independence square, the monument, a Hindu temple, a Budhist temple and then back to the hotel to pick up our bags and some drinks from the lounge while he waited to run us to the airport by way of a restaurant in a small community about halfway between the hotel and airport to buy some more satay. Everyone recommended this restaurant and they were right, it was the best satay I have ever had. The driver was very friendly and helpful and when he got us to the airport after a short visit by all of their government offices he told me the price which was 180 ringit. I considered it a super bargain as the hotel quotes 75 ringit just for the airport version.

That is my experience and there are still some things left to see and do in Malaysia on my next visit like the rain forest, zoo and more time at the government offices area along with the fort out near the ocean and the fire flies hailed as the 7th wonder of the world which happens to be a river boat ride at night.

Instead of a hop on/hop off bus, I'd recommend the KL Monorail. It's impervious to traffic, zooms about amusingly above the streets in a rollercoasterish way, runs every few min, and connects together KL Sentral, Chinatown (Maharajalela stn), Berjaya Times Sq, Bukit Bintang, the nightlife of Jalan Ampang and is a short stroll away from KLCC, which is a pretty good listing of central KL's points of touristic interest. I'm not sure it has a day ticket, but at around US$0.50 a pop, the fares are so cheap it hardly matters.