Cylinder Bore Measurement

This video shows how I measured the cylinder bore of two 2017 KTM 250 EXC cylinders, one new and one used (295H).
Bore Gauge: Mitutoyo 511-763 CGB-150X
Dial Indicator: Mitutoyo 2109SB-10
Digital Micrometer: 293-242-30 MDC-75PX

2017 KTM 250 EXC with Keihin 38mm + STIC & RK TEK Head

[henksteenkamp]

Great video. 9:43 Nice to see i am not the only one saying don't give the bike a blip of throttle when it is cold.

[michail]

Just what the doctor ordered. I was looking for this info just a few dayys ago:)

[desmonchild]

ktm 250 2007 2T - 490H - 4 pistons - 1 bottom end rebuild....still works fine.

[tomdidit]

Thank you so much for these videos. New sub and liked.

[ADVNevada]

Awesome! Great information, thanks for the video.

[mobgma]

great video! please do for a modern KTM 4 stroke.

[michalkunst]

How do you find out whats the correct angle of the bore meassurement against the cylinder walls, I can see how much the indicator of the scale rotates up&down because of leaning the bore meassurement.I guess you have to note the closest possible value to zero which is 66, 4mm.

[michalkunst]

6:16 you're saying: by rocking it you find centre or maximum of bore dimension.Actually you're looking for "minimum" that is closest to zero. Thats why it was bit confusing to me.

[NirHason]

Best informative videos - as always!

Any chance you can do a video on how to solve deceleration surges (knocking sounds) for the 2017 KTM? :)
Started 20 hours ago for my bike and I can't find the cause for this annoying feeling and sound.

[vittorioborchi]

good evening, I have a ktm 250 tpi 2018 and I should disassemble the throttle to clean the package lamellar, could you make a video? thanks, very useful videos!
you are great!

[stone]

My friend has a 300 exc from 2005 and just changed the piston once 10 years ago, still working fine 🤣

[rdsrf]

How can you tell if you have a type 1 or 2 cylinder?

[tkrey]

Interesting you don't say which piston size you have been or will be running. Given your measurements it looks like you'll be putting a size B piston in now and good to go!

[wigidy]

Do you have any starter system troubleshooting videos? I have a 2012 Husaberg Te250 with the poor starter design. I have upgraded to the stronger starter and rebushed all of the starter components. Starter works jumpered out. Looking to test out the other components in the system. Thanks, you have great content!

[Huda]

I just got my 2018 300 tpi cylinder rehoned bore spec is now 72.02mm what size piston should I get? Vertex have 4 options

[lindenphilippson]

So which size piston would you go with if you were using a new piston in the old cylinder? Size 1 or 2?

[ptft]

Hi Mark, when you change piston on your 300 tpi, do you go for minimum piston to cylinder clearance?
My 2022 300 tpi have never had issues with the airfilter but are close to the service limit at 10 hundreds already after 42 hrs of normal enduro riding so it must have been close to max tolerance already from the factory (6.6 to 8.8 hundreds)

[jjoeabhn]

Whats your opion on this that you can throw 200cc cylinder and crank to a 125 cc ktm is it just bolt on or is there some modification

[tomdangerfield]

Great vid cheers. Did you end up using the same rings or did you hone and fit new ones?

[cliffordreed]

Can you show where the cylinder size stamp or label is located on the outside of the cylinder? The manual indicates that it is on the right hand side, but doesn't show an example.