c5vettster
Member
- Joined
- Nov 9, 2014
- Threads
- 7
- Messages
- 48
I am repowering Gravely Z 252 mower model 992071. It originally came with a 27hp CV740 and I found a NOS replacement that is exact with exception of newer ignition module. The new engine is CV740-0020. The older engine is CV740-011. I had to come up with a new wiring harness. The carburetor + ignition box are now powered from a tractor pin that was marked for carburetor but was previously unused. The other engine carb was wired to the regulator line + the starter wire. I think I wired everything correctly. The engine starts easily and shuts down with the key. However, it doesn't go up in RPM. I've check and both the throttle and choke are wide open. The limiter screw appears to have no effect so to speak. But the engine only goes up to ~2500 RMP at WOT. I can't figure out where my problems are. Do you think the voltage on the ignition box maybe unstable? I tried wiriting it directly to the positive terminal and it didn't make any different. Is there any setting on the governor or a different hole on the lever that I need to try? Really puzzled here.