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Discussion Starter #1
I have done some searching around but I cannot find a Big Bore Kit for the Duke/RC 390 anywhere which blows my mind as these bikes are sold in huge numbers all around the world. I'd think that whoever makes a decent big bore kit would be on to a good thing. I'd love to have a Duke 450!

Perhaps I have not been looking in the right places; does anyone know of any big bore kits for the 390?
 

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Chad from KTM Performance was doing it to RC390 that is the same engine of our Duke.
https://www.rc390-forum.com/forum/ktm-performance/3127-3mm-bore-pistons.html?highlight=bore

I don´t know if gave up but you can contact him easily through telephone or email.

He made a performance kit but I do not have reference of it to use in our Duke in a day by day experiences.
https://www.rc390-forum.com/forum/ktm-performance/266-engine-kit-progress-9.html

Luis
Links don’t work for me!
 

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There is a big bore kit for the Duke 390 available from KTM. It comes on the Duke 790. There is also a bigger bore kit and it is on the Duke 1290


Yeah no need for big bore kit. More cost effective to replace your ride with another.

Sent from my ASUS_X00HD using Tapatalk
 

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Discussion Starter #9
True but it's illegal here to ride a 690 or 790 or 1290 on LAMS restricted licence.... Other bikes have a plethora of options re big bore/stroker kits [eg DRZ], so I'm surprised that nothing really exists for this bike.... and I imagine KTM are selling **** loads of these things.... I'm surprised that someone in India hasn't jumped on this one. If someone did this well they'd make a packet.
 
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