midsized johnson
Petty Officer 2nd Class
- Joined
- Jul 28, 2005
- Messages
- 155
My son recently bought the subject motor. I went through carbs, cleaned them and replaced bowl gaskets and spaghetti gaskets. Milled the backside of the carbs as they were slightly warped. Stator, optical sensor, power pack and plug wires are new from CDI. I have not messed with the fuel pump or the fuel-vapor separator. VRO is not connected.
The engine starts right up, idles good and has good hole shot. The problem is at 42-4500 rpm, there's a bad stutter in the engine. It actually smoothed out when throttled up to 5000 rpm.
I'm going to go through the grounds on the power pack and make sure all connections are clean.
Not sure what else to add. I saw something about the vacuum switch being a possible cause of running problems.
Could the overheat sensor be faulty and causing this, even though the warning lights didn't come on?
Thanks in advance for any ideas on what all to check.
The engine starts right up, idles good and has good hole shot. The problem is at 42-4500 rpm, there's a bad stutter in the engine. It actually smoothed out when throttled up to 5000 rpm.
I'm going to go through the grounds on the power pack and make sure all connections are clean.
Not sure what else to add. I saw something about the vacuum switch being a possible cause of running problems.
Could the overheat sensor be faulty and causing this, even though the warning lights didn't come on?
Thanks in advance for any ideas on what all to check.
