3-Valve engines

[Redstar]

Thinking of getting a new engine and I'm inclined to choose among the 3 valvers. I'd like to know what 3-valve engine choices are available? And what displacement do they come in?

 

[Linc]

Only comes as a 107.....

 

[mjc85]

Why a 3 valve ? They rev hard but are much harder to find upgrade parts for as opposed to a 125cc

 

[Redstar]

Only comes as a 107.....

I see. Many thanks for this valuable info.

Why a 3 valve ? They rev hard but are much harder to find upgrade parts for as opposed to a 125cc

Good point. I never thought about that. Now I'm thinking...... the bottom end should be identical with 2 valvers anyway, right? It's the top end that would be different and perhaps if a 3 valve cam is hard to find, or if there's none even, a regrind will have to be the only option.

I was curious about these 3 valvers. I may now open my options to conventional 2 valve engines.

Many thanks for both contributions.. great help.