Hey I'm just signing up to this form it is January twenty-fifth 20 21. I'm sorry if I'm too late, I read through your question and everyone else's post! Again I'm sorry if I'm too late in my response I just found this form. I can speak all this in confidence and fact! Yes they made a 265 kit, and they 300 kit. I'm not quite sure if they stop making the 265, or and the 300 kit, but I can tell you this, as I'm making this post now and the date that I posted, it's been about 6 months, and I purchased a 2006 Yamaha Blaster for my son, I went through Vito's, because Vito's is very popular but they do actually have another company who makes a bigger head for blasters and I will do my research if you get back to me, but I did go through Vito's, with a 265 kit, which is not a big bore meaning they give you an actual 265 head that has not been bored so you're not losing material! but rather a complete jug and head which gives extra room in The Jug to be bored out, I took that ahead and had it bored out to a 300. Then I contacted vetoes, and ordered a 6 mil stroker crank, connecting rod bearings etc etc, sorry I'm rambling on. But long story short I actually have a 300cc AKA cubic inch top end with a 6 mil Stroker with the appropriate parts I did go with a 38 mil slide carb I know I could have went larger it's jetted okay I think I can go larger it screams the only problem now is I think I need to spend even more money on widening the quad I have Herman A-Arms Banshee rear axle oh my God, no matter how wide I make it the stature of the Quad is small the seat the ergonomics I got to figure something out it's too much I got to figure something out I'm not preaching to know it all but yes I just want to answer your questions get back to me I'll explain I got to run