Older models can't be outdone either.
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This is a big valve cylinder head from Hispeed Racing, compatible with stock cylinders.
It is suitable for cylinder bores from stock to 57φ (148cc).
It is compatible with the CT125 (JA55) and previous generation engines of the same type.
This is a product that you might have thought existed, but didn't.
The reason is that there is no demand for heads for stock displacement overseas.
This is one of the long-awaited products that 8Ft wanted to offer to Japanese customers.
The valve sizes have been enlarged as much as possible, with the stock being In: 24, Ex: 21φ, and this product being In: 27, Ex: 22φ.
Not only that, but the intake and exhaust ports have also been significantly expanded compared to stock.
As those who have seen the stock ports know, they are quite narrow.
No matter how much you bore up or tune the intake and exhaust, this becomes a bottleneck.
Combining this product with the intake manifold sold by Company T would be perfect!
Furthermore, combining it with lightweight rocker arms would be even better!
This product includes:
① Reinforced valve springs
② A7075 super duralumin valve retainers
③ Big valves
④ High camshaft
⑤ Valve stem seals
⑥ Bearings
⑦ Piston
With this head, the engine will quickly rev up to the stock redline of 8500rpm.
(The manufacturer's published value states it can handle up to 15000rpm.)
Therefore, it seems necessary to consider ECU reprogramming or the introduction of a sub-controller.
And parts for high-rpm operation, such as crankshaft support, are also necessary.
The custom swamp goes even deeper and wider...