Anyone port a Makita 6421 cylinder?

[Shane¹]

When you port a cylinder and it is a strong runner the first time how do you decide if it is worth doing more on or trying something different

 

[huskihl]

When you port a cylinder and it is a strong runner the first time how do you decide if it is worth doing more on or trying something different

You don’t know it’s a good runner until you’ve run it against others to gain some perspective

 

[Shane¹]

It has gained quite a bit over stock. If I was going to do another cylinder what would you change number wise anyways?
Exhaust at 102 intake 75 and transfers at 130

 

[huskihl]

It has gained quite a bit over stock. If I was going to do another cylinder what would you change number wise anyways?
Exhaust at 102 intake 75 and transfers at 130

If it were me, I’d raise the transfers a few ° and try it. Then I’d probably lower the intake floor some