How to tune up a cylinder

[»_Takashi_«]

-Portmap
-Your wisched timings (you must now how your Enginge works and the needed timings)
-Cut it out from the portmap
-but it again in the cilinder and market the new lines from the bigger ports.
-Last but not liest milled it

But when your know-how or your milled skill are not so good,learn more and practise at old 50ccm cilinder and at the time still go up

i hope you understand my english xD

 

[pink_panther66]

is there anything to tune on Evolution III ?
I want to buy it and I want to know can I make it better. I will go with prorace exhaust, polini crankshaft, MHR internal rotor ignition and 21 mm carb. I will do the carter to suit the cylinder and flowen, anything else?

Greetings,

 

[tiba_karotsu]

is there anything to tune on Evolution III ?
I want to buy it and I want to know can I make it better. I will go with prorace exhaust, polini crankshaft, MHR internal rotor ignition and 21 mm carb. I will do the carter to suit the cylinder and flowen, anything else?

Greetings,

the Evo III is great out of the box, somebody here already got 20+hp with just a 21mm carb, he didn't do anything to the ports & he is a pro tuner so i doubt you can do better than him even if you port the cylinder & install a bigger carb.

it is not enough that you can afford the best & expensive tuning parts, it boils down to how good the person tuning & building the engine is. i can get 20+hp from your setup without having to do anything to the cylinder, i would just concentrate on tuning the carters for better flow bcoz without a good carter tune you can't get past 15hp & let alone 20hp.

porting the cylinder should be the last thing in your list.

 

[Panthelion]

Actually, I was a user of Polini Evo III. I got 20.1PS out of untuned cylinder with tuned carters, just light flowing and make it fit to the gasket. In my opinion, you'd better buy few exhausts and test them You can get Evo 10 and Pro Race II. You can use the Evo 10 flanche with PRII exhaust.
Greets,