1978 Ski-Doo Shop Manual, Page 356Get this manual
SECTION 08 SUB-SECTION 04-05
1978 340 RV AND SONIC MAIN JET APPLICATION CHART"
TEMPERATURE C
ALTITUDE Meters (feet) Sea level 600 (2,000) 1,200 (4,000) 1,800 (6,000) 2,400 (8,000) 3,000 (10,000)
340 330 310 290 280 260
330 310 300 280 260 250
320 300 290 270 250 240
310 290 270 260 240 220
300 280 260 250 230 210
280 270 250 230 220 200
270 260 240 220 210 190
340 320 305 290 270