Is the radiator switching on? if yes then it should not be a problem... watch out for any damages in radiator (even small damages can pose bigger issues)

Check for the SVC with a FID and check if you sensors work...

Is the bike consuming the coollant, did you change anything in the bike?

the fan is working fine. the problem existed even before oil change. radiator seems ok from outside.

Valve clearance will not cause that level of overheating! Vibratons might be because of engine mount nuts. Search the thread for Digislayer's pictures of where the 5 mount nuts are located.

There is some problem with the cooling system. Check these:
1) The fan. Most probably the relay is gone, so it isn't working.
2) The coolant level. Run the bike for 2-3 minutes, then switch it off and check the reservoir. If its low, top it up.
3) The thermostat. Maybe it isn't working, and allowing the coolant to flow!
4) The hoses & radiator. Don't just look from the outside. Take off the fairings, run the bike and look for leakages from the hoses or the radiator itself.
5) When was the coolant last overhauled? It says after 1 year the entire cooling system needs to be drained and new coolant needs to be poured in.
6) If all else fails, maybe the impeller in the water pump isn't working well. You'' have to get it checked in the svc. Also there may be something blocking the flow of coolant.

1. Check coolant level .If too old replace the coolant.
2. Check the tappet clearance .If too tight , causes heating ,doesn rev well .
3. Check the oil , if used more than 2000kms , change the oil.
4. remember its summer now , The cooling from the air will not be as effective as when in other times , so the engine heating is bound to happen.
5.Also check the cam chain , that its not too tight.

Santa

Do we have an Orkut Community for R15 owners?

We do, and 3 of the moderators are xBhpians

I'm not going to share the link here though

Just an idiot question: Does the temp light come on?

Assuming that the fan is working ok, there is enough coolant in the system and the temp light comes on, there are couple of possibilities for the reason for overheating:

1. Improper hoses/pipes fitting. Check that none of the hoses has kinks in the bends. The bends should be smooth.

2. If the hoses/pipes are ok, then check for a faulty radiator cap.

3. If the radiator cap ok, then check that the thermostat is working properly.

4. Lastly, this one is the most unlikely, but can happen, a faulty water pump.

Vibrations at high revs may be due to the overheating of the engine.

The above is assuming that you are using the right type of oil. If you are using oil of incorrect viscosity it will cause OVERHEATING, no 2 ways about that.

i am using 15w50 motul synthetic. my friends also use it. no problem with them. the overheating was there even when i ran on my 2k old yamalube. my bike is 1.5 years old.no change of coolant till date as to my knowledge.will get it checked today itself. thanks everybody for replies. i was a little frustrated yesterday. i just got my speedometer vib. problem resolved after several resetting and stuff of the entire front assembly.

macha I think you're supposed to use xxW40 only.. not 50. I'm using motul 300v 5w40. No problems. If nothing else works, just change the oil to xxw40 grade and see if it helps.
Otherwise u shud check the hoses etc. like others suggested, it might solve the issue

Yamaha A.S.S (man i love saying this) recommend Yamalube SS 15W50 for R15's

Manual specifies 20w40 so I think those asses in A.S.S. thought it will be the same if they add 5 and subtract 5.. so that means 0w60 also we can use.. all the best to whoever experiments!
But yea I don't think 15w50 oil leads to the problems that akhil is having..

Hey, I'm using the 15w50 for over 2800kms now. And although 40 is recommended, and 50 is thicker, I don't see any drop in performance or any problems. In contrast, the 50 oil works well when I thrash the bike (high speed riding all the time). So because the R15 revs pretty fast, I don't think there's a real issue with using w50.

Slight OT- how's your bike doing?

R15 - Fuel

Prolonged running of the R15 using petrol with additives like Power / Speed leads to a gummy type of residue that forms inside the fuel injectors. When that happens it leads to the bike 'missing'. The bike runs erratically and in extreme cases can also stall.
This is the same problem that is faced in cars. Therefore it is advisable to use normal unleaded petrol for the R15. I have corroborated this with the Yamaha service center who confirm.

I experienced difference when I used 20W50 instead of 20W40 in my P150 earlier. Felt "tightness" and it wasn't smooth as it used to.
I changed back to Shell 20W40 fasttrac immediately and it was like butter smooth again. I feel it's better to stick to the specs mentioned in the manual...

I see a lot of misconception about oil viscosity on this forum. Many assume that a thicker oil is better (i.e. it offers better heat protection). When engine designers and makers specify an oil viscosity it is after considering all aspects of the conditions that the engine will encounter. The following is quoted from Sport Rider Magazine:

"The reason the old-timer (20W-50 in this case) may suggest thicker oil is because in older engines with higher tolerances, thicker oils were necessary to keep oil pressure up. Others believe the use of higher viscosity oils results in better protection because high-performance engines are harder on oil. This isn't true in modern engines, and using oil thicker than specified can actually harm an engine. Internal oil passages and galleys may not be large enough to allow thicker oils to penetrate and flow as well, which can possibly cause starvation."

"Refer to your owner's manual and use the viscosity of oil corresponding to your riding conditions as specified by the manufacturer. The manuals often have a table with various temperatures allowing you to select the right viscosity." Unfortunately, there is no table in our owners manual.

For those who have been advised by Yamaha Service Center guys; ask them to show you the Yamaha Service Bulletin (which is issued periodically) which says that an alternate viscosity. Don't take their word for it.