Thread Approved

I got my new engine built, had a gentle test run of around 20km's to check for leaks, tune, vibrations etc. Around 50% throttle and 5-6K RPM.
After that it was lots of throttle, loading up the engine progressively in 1,2,3,4th and decel down the gears, using engine brakeing to suck the bores clean. After abut 50kms I was already 100% throttle revving to 9.5K.
100km oil and filter change.
My engine has only run 100% synthetic 10w-40. Even breaking it in. Just note there is no warranty where I live (Vietnam) Bikes are sold "as is" with no spares or backup, let alone servicing schedules. Basically you pay, sign some papers, jump on it and ride it away, few days later u go get your bike numberplate.

My method is similar to Motorman's run in method.
Done just over 1000kms so far and doesn't use oil, smooth trouble free engine. The carbs on the other hand (changed for 3 different ones)

If you are concerned stick to the manual, though feel free to rip through the rpm and gears once in a while

CBR and R15 both have modern engines (closer to litre class bikes than our commuter bikes) built to super high precision and designed for high revving. As such, they have less parts mating, so the traditional run is not quite applicable. And I'm not saying this by following Motorman's method (which I think is not right for consumer bikes), but just by looking at CBR's user manual which only says "avoid sudden acceleration and full throttle riding early on", whereas most other bikes recommend staying under 5k RPM and/or 50-60 kmph.

You can hit top speed, just be careful not to redline it, and that the engine is warmed up properly(start, idle for 15-20 secs and ride smooth and unaggressive for a few mins), and then gradually gain RPM instead of suddenly - preferrably going for higher RPM range in 4/5/6 gears, and on plain or gentle declined roads.

you are right , over revving will lead to excessive wear and tear for a new machine. so better avoid it for the running in period, if you can.
just let the piston set in .

bacha paida hote hi to daudne nahi lag jayega :P

even if you deceide to over revv it always keep a eye on engine temperature and dont let it run too hot in any circumstance.

The traditional 50-60 is only for Commuter bikes Not for Premium Class bikes almost all the 4 stroke bikes manufactured nowadays are capable of withstanding high revs at initial periods except those 100cc Commuters.

My friend bought a P220 and he did a long trip to mumbai and its been like 3 years his bike is good and returning around 40ish mileage, so its a Proof that you can happily enjoy any speeds but one advice do not Redline it, Until you cross 1500KM

Nope you dont want to try hard during run-in, coz it will take atleast a 1000Kms of prescribed run-in for the engine to set over. In the case of R15 during normal run-in the bike would tend to get over heated, thats just coz the block is new and getting settled... hope the same on CBR150 too. Revving you bike hard will not cause any harm but still your bike would never settle low if you try normal run-in.

Thanks for u help....

I would like to add my experience here, but I know that it should not be giving any 'false hope'. I got by 150R and rode it under 50kmph i.e under 5k rpm just for a couple of kilometers. Filled the tank. Then, I never looked down at the tacho. Rode it as I would., except for the manual line "Avoid Sudden Acceleration". Sometimes when I look down, I had seen 7 or even 8k on the tacho., but that was always a gradual build up. But went for first service two weeks prior to a month and 500kms on odo. Back from first service, as have crossed the 500km mark in manual, all limitations were set off. Now, 2.5k on odo and I could feel a lot stress free and swift build up of revvs. To say a few, did 4 hours non stop riding., 2 hours of triple digits and I usually rip it not by riding fast but under high revvs inside my town. she never gave me any complaints and she's as good as new.

My two cents is that, ride as you would ride, so that you are giving a chance for the engine to settle in and understand your style of riding. Just follow the manual lines to avoid sudden acceleration. All the best for a happy ownership.

Dude My question is Going 7k in first 500km affects mileage later ???

The cylinder doesn't wear to the piston, The piston doesn't wear to the cylinder either. The rings are what need to bed in.
The way a ring seals is through combustion pressure pushing the rings outwards, Not spring tension.
In a car/truck with shell type bearings then you can take it easier, however with a bike engine the bearings are roller/ball bearing types, there is no wear on these items compared to shell bearings with their soft metallic layers. Only parts that wear are the rings themselves.

Don't worry too much about throttle, RPM. Just ride it like you will be riding it later, Let it warm up at startup while you are putting on your riding gear, ride a km or 2 nice and steady to get the internals warmed up and expanded, then start rolling on the throttle and enjoy the bike.

What are the effects of revving the engine to high RPMs?

While riding, if I take the engine to 6K-7K RPM regularly, how will it affect my engine compared to someone, who drives sedately and does not rev beyond 4.5K. Assume its the same make and model of the motorcycle.

And my carburetor was improperly tuned, so the engine kept shutting off. To overcome it, I twisted the throttle all the way, making the RPM jump to 9K! I have done this a few times this winter.

What kind of damage can i expect?