Just got my '08 Service Manual and ran across the following specs. Seems like the 800 is going to full open too late at 7800 rpm (low altitude) or 8100 rpm (high altitude)?
Arctic Power Valve (APV) System Specifications
NOTE: The servo will activate once at APV cycle RPM. If the servo cycles three times, cable length adjustment or valve inspection is required.
NOTE: The 800 cc and 1000 cc have a three-stage exhaust valve system. The stages are closed, midopen, and full-open. Each model has a designated RPM at which the system is synchronized and checked by the ECU for proper operation. This occurs once each time the engine is started. The 800 cc system is checked at 4800 RPM and the 1000 cc system is checked at 6100 RPM (Crossfire/F-Series) or at 6270 RPM (M-Series).
ENGINE | VALVE POSITION | CYCLE RPM
600 cc | Full-Open | 73-7400 (Low/High Alt)
------------------------------------------
800 cc | Mid-Open | 60-6500 (Low/High Alt)
800 cc | Full-Open | 78-8100 (Low/High Alt)
------------------------------------------
1000 cc | Mid-Open | 6300 (Low/High Alt)
1000 cc | Full-Open | 6500 (Low/High Alt)
APV CABLE LENGTH
ENGINE | LENGTH
600 cc | 36.0 mm (1.417 in.) ± 1 mm (0.039 in.)
800/1000 cc | 35.0 mm (1.377 in.) ± 1 mm (0.039 in.)
NOTE: The servo will activate once at APV cycle RPM. If the servo cycles three times, cable length adjustment or valve inspection is required.
NOTE: The 800 cc and 1000 cc have a three-stage exhaust valve system. The stages are closed, midopen, and full-open. Each model has a designated RPM at which the system is synchronized and checked by the ECU for proper operation. This occurs once each time the engine is started. The 800 cc system is checked at 4800 RPM and the 1000 cc system is checked at 6100 RPM (Crossfire/F-Series) or at 6270 RPM (M-Series).
ENGINE | VALVE POSITION | CYCLE RPM
600 cc | Full-Open | 73-7400 (Low/High Alt)
------------------------------------------
800 cc | Mid-Open | 60-6500 (Low/High Alt)
800 cc | Full-Open | 78-8100 (Low/High Alt)
------------------------------------------
1000 cc | Mid-Open | 6300 (Low/High Alt)
1000 cc | Full-Open | 6500 (Low/High Alt)
APV CABLE LENGTH
ENGINE | LENGTH
600 cc | 36.0 mm (1.417 in.) ± 1 mm (0.039 in.)
800/1000 cc | 35.0 mm (1.377 in.) ± 1 mm (0.039 in.)
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