I built a kitted 97 Tomos LX that used to rev to the moon, basically pinging the speedo all the way around and back almost to zero. After several years of ripping I started having some issues and long story short I have a new CDI box and the old original/stock box is gone. Now I can only get the bike up to about 40mph when it starts acting weird, kind of like four stroking but with a slightly different sound. I'm wondering if it's a rev limiter in the CDI box or possibly another issue.
It looks like my bike currently has the "Flash: made in India" box (https://www.treatland.tv/tomos-A35-OEM-cdi-box-p/tomos-a35-cdi-box-230627.htm) has anyone had any problems with this box on kitted bikes and if so do you have a reco on something I should replace it with, maybe the parmakit box or another "OEM" box from treats or the moped junkyard?
I've rebuilt the top end and replaced the gaskets, replaced the reeds, tried a different exhaust, jetted up and down to extremes, and tried a different carb body all with the same result so at this point I think it has to be electrical or maybe the transmission but I'm open to suggestions.