That sounds like a gy6 motor... I ordered a cdi with no reviews limiter and coil pack and carb for it? Total was $34, the carb on the buggy I'm working on to my surprise was NOT tamperproof like the one you pictured... however you can cut grooves into those screws and take them out... but for how cheap they are you might as well buy another one... I bought it so I could rejet it... didn't do me much good, but also I couldn't use the cdi, wrong plug shape... so if you order one be sure it has the same style... i.e does your cdi have sharp corners on the plug or are they rounded off... give that a shot...