I have a topic posted in the volvol section but I just figured out I have a volvol Penta engine that has been converted to the thunderbolt IV ignition.
I have a new to me 1994 Wellcraft Nova Spyder 202 with a Volvol Penta 4.3l.
Starts first time every time, idles smooth as silk, will run upto approximately 2800rpm with zero issues.
After 2800rpm it falls on its face and bogs completely down when you try to give it more throttle or from the whole shot.
Here is where it gets odd.
At random if I get the throttle in just the right position typically and let it go for 2 to 4 minutes and don't touch the throttle at all it will slowly excellerate past 2800rpm and Max at 4000rpm. Once it does that I can use the throttle to slow down or speed up as long as I keep it above 3000rpm. If I drop below 3000rpm I have to repeat the 2 to 4 minutes process which does not always work.
Today it began randomly slowing down for a few minutes then accelerating back to the original speed.
Since the boat is new to me I decided to just begin with tune up to set baseline for maintenance.
New spark plugs, New distributor cap, New ignition coil, All new filters, All new fuel lines, New anti siphon valve, New Fuel pump, New oil engine and outdrive, rebuilt carborator, New battery, New impeller, Cleaned spark arrestor, Fuel tanks checked with inspection camera for debris and sampled for water, new fuel pick up tube installed in the aluminum tank.
One thing I found is when I checked timing via timing light it would sporadically jump all over the place.
Any ideas on the lack of whole shot and difficulty getting over 2800rpm
I have a new to me 1994 Wellcraft Nova Spyder 202 with a Volvol Penta 4.3l.
Starts first time every time, idles smooth as silk, will run upto approximately 2800rpm with zero issues.
After 2800rpm it falls on its face and bogs completely down when you try to give it more throttle or from the whole shot.
Here is where it gets odd.
At random if I get the throttle in just the right position typically and let it go for 2 to 4 minutes and don't touch the throttle at all it will slowly excellerate past 2800rpm and Max at 4000rpm. Once it does that I can use the throttle to slow down or speed up as long as I keep it above 3000rpm. If I drop below 3000rpm I have to repeat the 2 to 4 minutes process which does not always work.
Today it began randomly slowing down for a few minutes then accelerating back to the original speed.
Since the boat is new to me I decided to just begin with tune up to set baseline for maintenance.
New spark plugs, New distributor cap, New ignition coil, All new filters, All new fuel lines, New anti siphon valve, New Fuel pump, New oil engine and outdrive, rebuilt carborator, New battery, New impeller, Cleaned spark arrestor, Fuel tanks checked with inspection camera for debris and sampled for water, new fuel pick up tube installed in the aluminum tank.
One thing I found is when I checked timing via timing light it would sporadically jump all over the place.
Any ideas on the lack of whole shot and difficulty getting over 2800rpm
