i heard about Nulon engine treatment. People say it makes engine smooth as if it was dipped in butter.. Is it True? Can i use it for my rtr.

its quite a misconception that high speed causes over heating of the engine.

actually, considering an apache 180, at speeds of 100 kmph, the engine rpm is about 6000. which is the optimium rpm for most bikes. this is also generaly the point of highest thermal efficiency for ic engines which means that for every bhp generated, you are wasting the minimum heat.
but if you consider the heat in absolute terms i.e energy to be disipated per second, this value is high enough to fry the internals if not provided ample flow of air.this is where the speed comes into picture and helps cool the engine faster than it is generating the heat.

another reason why it is better to run the bike at 6000 rpm is that the engine heats up he most at around 30-40 kmph. here the heat generation is just as much as 6000 rpm (lower thermal efficiency of engine) but the flow of air is low. hence the engine heats up more. the engine is designed to dissipate that heat efficiently. and hence when the flow increases (higher speeds), the cooling actually increases by leaps nd bounds whereas the heating does not increase appreciably.

I had a temperature guage installed under the spark plug (CHT guage) on my 150 CC hunk. and this is what i had observed. the explaination is just a theory why this happened.

infact, during my last 1950 km round trip in 2 (riding) days, my bike was running at 85 kmph for most of the time for continuous 4-5 hrs without stops (i started at 8 am, had lunch at 12, break at 3.30 and dinner at 9pm). and the bike never gave any over heating signs.

most of the air cooled engines are capable of dissipating more heat than what we presume on basis of feeling of temperature.

so dont worry, as long as you are riding at less than 80 % of your top speed, its fairly fine for the engine.

the bike doesnt do 100kmph @ 6krpm... highly impossible... im guessing 100kmph comes somewhere 7.5krpm...(rough guess)

first of all your bikes engine is air cooled so dont push it for this long time
second for oil issue 3 hour constant driving makes your engine oil so hot. some of it burns because of that and if u want solution for oil trouble i prefer pulsar tech. for cool down eng oil temp so if u can make this modification ur problem suppose to be solved
its just suggestion In theory it should be worked

Guys ones again i need your help and suggestions.

Guys ones again i need your help and suggestions.

I have installed a new bore in bike. Untill few days everything was OK but now i can see white smoke from the exhaust even when idling and poping sound from exhaust when i release the exhaust.

I have check the Engine Oil level and its on the Full Mark.

I know white smoke is indicates that engine oil is burning inside the chamber and if this is the case engine oil level should drop but there is no drop in oil level.

Poping sounds indicates a lean A/F but when i make it a little bit richer, i gets black smoke from the exhausr which is an indication of very high rich A/F.

Guys I am confused here and looking for your help.

Bro Motul 15W50 FS is the best engine oil that you can get for your RTR. There are only two common known issues with any bike that leads to an engine oil decrease,

1) The head gasket or any other gasket seal must have been broken and oil might have leaked through it. So carefully look around of any oil leak sign, I have seen many old RTR 160s having oil leakage through the head gasket seal.

2) The piston ring set clearance, very occasionally the piston rings may not provide the best seal on the bore, allowing engine oil to leak on to the AFR mixture and get burnt. So ask the svc to check the piston rings for damage or clearance. If required change the rings.

I am 100% sure you will not have any oil burning issue after that.


No, I beg to differ in thoughts. The Motul 300V Double ester FS is the best that you can get for your RTR/R15/P220, provided you rip your bike to its capabilities and abuse the engine with more heat. Else its useless, if you ride under 4K RPM then a normal mineral oil will suffice the need.


The RTR180s 5th gear's sprocket ratio, exactly matches R15s 6th gear's sprocket ratio. 100KPH comes at around 6.9RPM in both the bike's top gear.

Brother RTR 180 do exactly 93kmph at 7k RPM and 100 is around at 7.5K RPM.

If You could also shed some light on my new problem, it will be of great help.

Bro, pls take a snap of the spark plug and update, don't conclude the engine to run rich/lean mixture by the exhaust. Also your question has the answer in it, do you get the popping sound when the AFR is set rich? if no then all you need is the correct level of tuning.


Regarding the RPM vs Speedo, I have ridden both bikes back to back and I see 72KMPH at 5K RPM precisely and 103KMPH at 7K RPM. Ok will keep an eye on it today

Hi, This is Rohit and I am new to this forum. I've been following many of the threads closely and this thread is one of them. I am also facing the same problem of engine oil getting over. To be precise few months back I went for a ride to Daman along with few of my friends. While returning back home I ripped my bike completely on the highway. From Daman to Dahanu that's 50kms aprox. I was riding my bike with full throttle and a pillion. In Dahanu when we stopped for a break I could actually see that engine was very hot and it was also giving out fumes or steam I am not sure about that. After a 30 minutes break bike was normal again. But few days after that trip I realized that oil actually got over which never happens. I thought because of over heating it must have got over. But when I showed it to service center they told me that the block piston is damaged and would cost me minimum Rs 5000 to repair. I was not in financial condition to shell out Rs 5000 just for the black piston. I did my normal service of bike that is oil, oil filter change etc. But in the coming months what happened was even more astonishing. My top speed started reducing. From 130 it came down to 100, from 100 it came down to 80 and from 80 it came down to 60kmph. But top speed I mean when ever bike crosses that limit it lags as if there is no petrol in my bike. It also gave black smoke or carbon from the exhaust. A week back i finally managed to change my block piston and did a complete service to my bike. Its been 250Kms now and its working fine. I need to know any precaution that needs to be taken to avoid such thing happening in future?
Thanks in advance

The first precaution you must now take is let the new block piston set in properly. Strictly no ripping until then. Avoid speeds above 60kph. Just like running in procedure. Thats one. Secondly, the only thing that a four-stroke expects from us is to give it good oil and at regular intervals. Most riders f**ck up this part. Use a good mineral or semi-synthetic oil for your bike of 20W40 grade. Thats all you need.


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