Buying my 1st motorcycle; Details about engine reliability & lifespan

I'm planning a KTM bike, but heard their engines need a rebuild after 40,000 km.

BHPian Zaaq recently shared this with other enthusiasts.

I have been an avid reader of the forum for quite some time now and It's a great platform for newbies like me to get insights from experts and fellow enthusiasts.

I am looking to get my first motorcycle and I have been monitoring the market for a good motorcycle that suits my use case and my riding style. During the research, I came across some information online stating that KTM engines need a rebuild at 40k kms.

We know that KTM are high compression, short stroke engines and the durability factor also depends on the maintenance and the rider. I would like to know how true is this news about rebuild and also would like to initiate a conversation about the niggles and reliability factors of today's modern motorcycle engines.

Thanks in Advance to fellow BHPians for sharing your thoughts and enlightening me and other enthusiasts!!

Here's what BHPian Ratan Prabhu had to say on the matter:

Modern engines are reliable as long as you treat them like they are supposed to be treated. Meaning - Follow the owner manual strictly. Follow the run-in procedure as recommended by the manual. Do not unnecessarily redline or stunt. Service on time, use stock engine oil or at least the same grade oil.

Regarding engine rebuild, there is never a thumb rule to get it done at any specified kilometres for any motorcycle engine. It will always differ from one motorcycle to another. Of course, mechanics may suggest you go for a rebuild after a certain kms as it will get them a good labour charge. Even for KTM, it cannot be generalized that they need a rebuild in 40k kms. I've read some long-term ownership reviews where there hasn't been any rebuild and have seen rebuild videos with as low as 25k kms.

Having said that, the general consensus is that Japanese engines are more reliable than non-Japanese engines. But in 2024, I don't think the difference is that much.

Here's what BHPian Karthik1100 had to say on the matter:

Not only KTM, whichever bike is tuned for performance, doesn't last longer. KTM engines maximum can run for 50k kms. Two of my friends rebuilt their KTM engines after 40k+ kms. In order to increase power and performance companies use lightweight piston and engine components which are prone to quick wear and tear. Motorcycles which are designed for touring generally give longer life, again it depends upon how they ride and maintain it.

Check out BHPian comments for more insights and information.