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Cylinder Works Big Bore Cylinder Kit
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Cylinder Works Big Bore Cylinder Kit 270cc

Fits: 2013 KTM 250 SX-F
Part# 1296750033

Our price: $414.97

MSRP: $649.95 - You save $234.98 (36% off)

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Temporarily out of stock
Expected in stock Dec 23, 2015 - More Info

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Additional Videos

How to rebuild the top end on a motorcycle or atv (Part 2)

Cylinder Works

How to rebuild the top end on a motorcycle or atv (Part 1)

Cylinder Works Big Bore Cylinder Kit

RM YouTube Channel


  • Cylinders are Nickel Silicon Carbide plated for long life and honed to exact size for easy piston installation.
  • Designed for easy bolt on installation, with no machine work to your engine or cases.
  • Kit comes complete with cylinder, piston kit, and gaskets.
  • Replacement piston kits and gaskets available.

Cylinder Works Big Bore Cylinder Kit Reviews

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0 of 0 people found this review helpful.

The vertex piston oil ring was pretty cheesy

Comments On Nov 02, 2015:Not to sure how long this thing will last . Over all every thing was allright but the oil ring was pretty cheap . You would think they would give a better oil ring thats the only thing i could see going wrong .the stock pistons oil ring was 3 times stronger. Will let u know how it holds up thanks

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0 of 0 people found this review helpful.

Good for a little extra power

Comments On Oct 23, 2015:I installed this kit on my 350 because I was having some issues with the lack of low to mid range. I'm not a guy who likes to rev his bike to the moon. I like to ride in the mid range. I didn't have a problem with the power of the 350 until I switched from racing hare scrambles to racing motocross. I was going to buy a new 450 but I talked myself out of it. Instead I bought the 365 kit to see if would help the bike enough to keep it. I was right. The 365 will not make it as fast as a 450 but it did help out a lot. I have about every bolt on performance part you can put on a 350 (yoshimura exhaust, velocity stack, 2012 350 mapping, high flow water pump and the list goes on). The extra power that the engine gained allowed me to be more comfortable on the bike. If you are looking at this kit thinking it will turn your 350 into a 450 you are wrong. But if your looking for a few more ponies out of your 350 this a great option. Hopefully this has helped with your decision.

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0 of 0 people found this review helpful.

Bolt on power

Comments On Jul 09, 2015:Swapping out the old cylinder for the new was very strait forward and conversion fitted well with all mated factory parts. It was an easy bolt-on 8% extra power.

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3 of 5 people found this review helpful.

Catastrophic Failure

Comments On May 12, 2015:Bought this kit, install went great! Installed this and hotcams at same time. Broke in cams and cylinder as per specs. Took out for first ride and changed oil after, FOUND BROKEN WRISTPIN CIRCLIP IN OIL. Called company, they overnighted part without hesitation. Found other half in engine, removed it with magnet. Installed new ones, bike ran like a dream. 2 months in, let clutch out of a turn and the bike died on the spot with a small pop noise. Broke down engine AGAIN and found the wristpin slide out of place due to another failed circlip, the connecting rod threw the piston up into the head bending my valves and bent the connecting rod while scoring my cylinder wall at the same time. 2,000 in damage thank you

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0 of 1 people found this review helpful.

365cc for KTM 350sxf...buyer beware

Comments On Nov 03, 2014:Cylinder kit goes together nicely, but Cylinder Works gave no support after the installation of this kit. The kit obviously changes the fuel needed, which will require a ECU software change, they offer zero support except a jpeg of suggested settings.

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4 of 4 people found this review helpful.

Awesome kit

Comments On Mar 27, 2013:The cylinder works kit is a very reliable upgrade over stock. Comes with everything necessary to install it. There's no replacement for displacement!

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2 of 2 people found this review helpful.


Comments On Mar 14, 2013:with hot cams and porting job, it is a HUGE difference... reached 42.39hp on my kfx400, very happy!

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0 of 1 people found this review helpful.

Easy to install

Comments On Jan 03, 2013:The kit was pretty easy to install, It sounds good idling, I havent broken it in yet.

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2 of 2 people found this review helpful.

Much more than I expected!!

Comments On Dec 03, 2012:Crazy power, I usually ride 7 days out of the week. 3 to 8 hours a day so far my new big bore kit is holding up like a champ.

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2 of 2 people found this review helpful.

Crazy Power

Comments On Aug 19, 2012:Installed easy and was there in a snap.

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