i have a 2003 blaster that i just took apart to rebuild,got bike threw trade and it was barely running low compression and oil coming out of crankcase vent so i figured getted it bored out and fresh top end and crank seals,when i drained the gear box there was about 1/2 gallon of oil in it which seems to me to be way to much,how much oil should be in gear box? and should i still replace crank seals? thanks
