big bore kit wrist pin sleeve/bushing for 223cc/zs165mm engine

stoppre12211 · 11-11-2024, 03:39 PM

hey guys.

Not sure if this is a bad solution, but I was really hoping to bore out my 223cc/zs165mm on my Vitacci Titan EFI. The only bore kit that fits the 15mm wrist pin available will go from a 65mm piston to a 67mm piston. I dont find that gain worth the effort. But I was wondering, could I use 15mmIDx16mm or 17mm to fit the larger wrist pin requirements of other cg250 big bore kit. Just raise the wrist pin OD to fit the 17mm 72mm-75mm bore kits. Let me know what you think.

I know its going to have ramifications to compression ratio and EFI flash but would this wrist pin sleeve solution even be viable. thanks.

https://www.aliexpress.us/item/32568...yAdapt=glo2usa

slithica · 11-11-2024, 08:35 PM

Do not do what you are thinking, it's stupid.

There are also multiple ones listed on ebay. Don't buy one larger than 70mm. You'll regret it.

Did a quick google, your engine should be a cb250d-g. ignore the above link(removed)

Basically no, there are no big bore kits for your engine. Get a bigger engine.

Maybe an XR250R engine swap?

https://www.alibaba.com/product-deta...174950828.html

possibly something like that?

One guy bought an actual honda engine though.

https://www.chinariders.net/showthre...t=21224&page=2

11-11-2024, 03:39 PM	#1
stoppre12211 Join Date: Nov 2024 Posts: 4	big bore kit wrist pin sleeve/bushing for 223cc/zs165mm engine hey guys. Not sure if this is a bad solution, but I was really hoping to bore out my 223cc/zs165mm on my Vitacci Titan EFI. The only bore kit that fits the 15mm wrist pin available will go from a 65mm piston to a 67mm piston. I dont find that gain worth the effort. But I was wondering, could I use 15mmIDx16mm or 17mm to fit the larger wrist pin requirements of other cg250 big bore kit. Just raise the wrist pin OD to fit the 17mm 72mm-75mm bore kits. Let me know what you think. I know its going to have ramifications to compression ratio and EFI flash but would this wrist pin sleeve solution even be viable. thanks. https://www.aliexpress.us/item/32568...yAdapt=glo2usa Attached Thumbnails
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11-11-2024, 08:35 PM	#2
slithica Join Date: Jan 2021 Posts: 49	Do not do what you are thinking, it's stupid. There are also multiple ones listed on ebay. Don't buy one larger than 70mm. You'll regret it. Did a quick google, your engine should be a cb250d-g. ignore the above link(removed) Basically no, there are no big bore kits for your engine. Get a bigger engine. Maybe an XR250R engine swap? https://www.alibaba.com/product-deta...174950828.html possibly something like that? One guy bought an actual honda engine though. https://www.chinariders.net/showthre...t=21224&page=2
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