Carb jetting for a tuned LCII bike

[andreas67]

Gentlemen,

I would like to share my current status. I have an YPVS from 1983. Got it bored to 64.5mm together with a complete overhaul and port job at www.ebos.se.
Got som exhaust pipes from Kenny at TSA, Two Stroke Addicts.

The bike runs like a mother.....

I run 3% oil in the fuel.
Started the running in of the engine with std jetting. Lean, lean, lean!!!
I mounted an exhaust gas temp sensor in the right exhaust pipe, ~10cm from the exhaust port.
Goal is to stay below 600 degC stationary and 650 degC transient.

Currently I have lifted the needle to the max and are running a Main jet size 280.

Sometimes the temperature closes in on 650 to 700degC so I am considering going to a Main jet of 290.

The engine runs smoothly from idle to as far as I dare to rev it.... I´m no Kenny Roberts.

In std conditions (before the overhaul), I was dead scared at full throttle and now after the rebuild I am scared already at half throttle, but boy do I laugh out loud!!!

Any tips, recommendations that i need to know?

As you can tell I am not a fluent english speaker, from Sweden, so bare with me.... => Andreas

[midlifecrisisrd]

Are you using an airbox or individual filters?

Steve

[andreas67]

Individual filters.

[midlifecrisisrd]

i ran 270's with an airbox so reckon you would be nearer 300 with pods

steve

[andreas67]

Thanks for the tip, I guess I will order 290 and 300 main jets and try it out!