i dont think theres a 150cc kit for the 125cc but you can get a 146cc kit,, look up "lifan big bore" on ebay, and you find it,, it should be $150 for the hole kit plus post or if not pm one on the sponsors
umm i that links broken, but i looked around and found it but theres a price there too,, $280,
Product: Motovert Racing 150cc Big Bore kit - Jialing
Code: MTVBB_01
Price: AUD 280.00
Description: Cylinder and piston kit, ceramic coated cylinder, high comp piston, piston pin, ring set and c-clips. Will fit onto standard Motovert Jialing 125cc engine and Terramoto Jialing Engine.
Man by the time you pay $280 + postage for the kit or pay a shop to fit it ... You could easily sell your Jialing 125 and add the extra to buy a brand new Lifan 150 which will destroy your Jialing "150" and be far more reliable to boot ...
As stated , you at least need to fit a Lifan big valve head and bigger carb , pipe etc ... then you'll most likely bust your kick starter gears , crack the cases ... or bust the crank ... LOL ...
I can definitely assure you that those problems WILL happen IF you try to run your stock small valve , small chamber Jialing 125 head with a 150 BBK ...
Yes $580 for the Lifan 150 vs some ridiculously exaggerated price for the Daytona 150 ... Believe me ... all of the brand name bikes are hardly worth the price they're sold for in AUS ... I've seen the actual prices in USD from the pitbikefactory.com ... Try around $850 USD for the latest Pitster LXR's and around $740 USD or something like that for a Motovert RX ... a guy posted a link to the website on Planet Minis ... THEN not long after ... general public access to the specs and prices of various bikes was quickly removed ... Obviously to avoid embarrassment to alarmed sellers of the bikes who jack the prices sky high ... Believe me ... quality has got NOTHING to do with why their prices are so high ...