125-200cc Gas Mileage during HS race ???

I have a 13 WR125 setup as 144 right now with lectron carb. Getting ready to run my first HS this weekend maybe with the bike. It's 2 hour event so just wondering if I can get the whole 2 hours out of the stock tank or if I should pit at some point during the race. The course is semi tight and not a lot of high speed sections. Senior A level riding ability.

Thanks for any input.

As long as its not fitted with the cr tank I think you should make it !!
I managed a 3 hour H&H one time that was slow going on a tank but it was tight and was on fumes.
Our rides are 3 hours long and I pit at 2 hours for a refill.

Depends on your pace---my CR 150 with Lectron got an average of 1.5 gallons per hour at three different events. Two events were fairly tight, the other was more wide open and sandy. Mid-pack A rider (40+ years old but still trying to run with the kids). Before racing it I did several trial runs with it---the CR 1.85 gallon tank was usually on fumes at the 1 hour and 15 minute mark so each race I would stop as close to the 1 hour mark as I could.

9liter tank should be fine i had a 3hour one on sunday on my 360 i used 7,2l fuel in a 9l tank, i know cus i emptyed 1.5 cans into her.
these were 5 mile wet muddy laps at mid to full throttle.

144's should be ok i rekon.