john_bilbrey
Member
- Mar 22, 2003
- 255
- 0
My '97 ATK 260 runs great at low and mid rpm, but up top it's blubbering/stuttering. Once the powervalve opens, it runs out of juice real quick - the hit is short-lived. Running a 340 main jet - is this too much, or not enough? I haven't had the chance to do a plug check (WFO and kill it) yet. Maybe it's something with the powervalve adjustment? Any ideas?
Oh, it has a fresh (2 rides) piston,ring, bearing, etc... using Bel-Ray H1R with 93 Chevron @50:1
Oh, it has a fresh (2 rides) piston,ring, bearing, etc... using Bel-Ray H1R with 93 Chevron @50:1