over heat vespa px 177 bgm kit

Hi there

I have px 1989
With BGM 177 KIT
1.5 MM gasket
57 bgm crankshaft 
63/23 gear ratio
sip vespatronic kit 1.2kg fly wheel
24/24 carburettor 
Fuel tap fast flow Bgm 
I made a week ago Completely overall with bgm bearing and oil seal
Spark plug b9es
Polini air filter 
main JET 140
The vespa running well ,BUT , the temperature going to 160-190 degrees and even more.
I have SIP speedometer with spark plug gauge.
What can be the problem.?
Thanks 
Liran