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vertex pistons

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had one in my 2009 kxf 250, i re ringed it at 25 hours and still looked new sold the bike with 40 hours on it ran great. very good quality IMO. i will be using one again in my new bike.

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indy rider, i see you have stage 1 intake and stage2 ex. i tried stage 1 then stage 2 in my kxf 250, i was thinking of doing stage 1 in and 2 ex like you. do u recomend it or how do u like it and did u ever try both stage 2

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indy rider, i see you have stage 1 intake and stage2 ex. i tried stage 1 then stage 2 in my kxf 250, i was thinking of doing stage 1 in and 2 ex like you. do u recomend it or how do u like it and did u ever try both stage 2

I've never ran both stg2. I did run both stg1 but I went to the 1-2 combo when I did the BB kit and the porting. It's hard to tell exactly what each individual mod did because I did all the engine mods at the same time. What I do know is that I absolutely love this set-up. It pulls like a beast off the bottom, mid hits like a supercharger and it revs to the moon.

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im going to try it and see. with the stage1 cams it hits hard a pull but i hit the rev limiter to fast and with the stage 2 cams some tracks are harder to ride. i have been doing one mood at a time to see what each one is doing. after this i am going to do a cylinder works 269bb kit with the vetex piton. im not going to port this bike i did my last one from yosh yes it was good but not worth the money IMO.

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thanks to the people that gave me your opinion but not to the ones who decided to talk about something else

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sorry, but i wonder why people get mad about that, these fourms take on a life of there own sometimes.

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Was about to install a Vortex in my 2008 ktm 250 sxf and noticed:

- No orientation marking on the compression ring.

-Way smaller oil holes (scraper ring) in the Vertex than the oem.

-Way thinner skirt on the Vertex.

-No deburring on top of piston, leaving very sharp edges (pre-ignition)

Any professional engine builder opinions on these?

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I'm not a professional engine builder but sharp edges can't cause pre-ignition because aluminum doesn't retain heat like steel does and any burs would simply burn off.  Also the edge of the piston isn't involved in ignition, it is basically a squish band designed to push air-fuel into the centre of the combustion chamber.

Thin skirts and nowadays a v short skirt are all about reducing the weight of the piston.  That actually a good thing as it will reduce the forces involved in the piston going up and down at high velocity. 

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