Yasuni c21 problem!

hi every body.

iv now brought a pollini evo3 and decided to go for a yasuni c21 to match this on my aeorx. only problem is it dont want to move it's totaly zapped its' power now. im using a dellorto 21mm carb maybe this is the problem? also theres a available hole in the cylinder cap where water escapes can any one tell me whats goes in there?



evo 3 is  a great and better exhaust!

In the hole, you have to mount the termostat in.





thanks for the replie.. money is tight so i will have to keep to the yasuni.

the hole i ment is facing upwards. iv tried fittin a bolt in there but seems the threads arnt a match. any ideas what i need?