Hi All. I'm looking for some help before I decide to wash my hand of this 2 month project. Lots of $ and it has dominated my life for 2 months. I really want this motor to run like it used to. As interesting and fun as its been I'm just getting SO frustrated and I'm spending time on this instead being with my kids or on the water with kids.
If anyone has come across the issue below I could really use some guidance from this forum.
SN b396723
I'm in the final stages of the rebuild (rebuilt it now the 3rd time in 2 months). I have narrowed it down to a carburation issue. #1 keeps running lean. Anyway, I have really taken my time on this latest rebuild. I'm in the timing stage before i run it on water. I did a static timning with timing light. 23btdc. Took it to launch, on trailer I set up timing, idle, etc while on trailer. While running and in gear (tried in neutral too manually moving throttle) I accellerated and the engine started kind of choking and over revving, like the engine was getting away from me as I advanced the throttle to approx 200-2500 rpm. Kind of had that YZ80 sound coming down from a super high rev..if you know what I mean. Engine rpm very slightly varies at idle.
Notes:
New block- holes ball honed and are spec. (couldnt find the water leak into Cyl1 on my old block which was steaming detonating #1 several times so I replaced..no more water jacket leak thank goodness)
compression 130 all cyl.
Spark-Good 3/8 gap
Fuel- Seems to be flowing well. Pulses beautifully when looking at the stream just before carbs.I detached briefly while running.
New Plugs
Fuel pump rebuilt
Fuel lines are new
All ignition components spec out using DVA
Rectifier charges my battery
Battery is new
New water pump
Carb just rebuilt- Floats, needles, seats. Floats adjusted perfect. Jet sizes are correct.
Prior to carb rebuild the same thing happened. I thought rebuilding carbs would fix problem b/c the top carb needle was worn.
PLEASE tell me there is something obvious I need to do.
THANK you!
Korbs
If anyone has come across the issue below I could really use some guidance from this forum.
SN b396723
I'm in the final stages of the rebuild (rebuilt it now the 3rd time in 2 months). I have narrowed it down to a carburation issue. #1 keeps running lean. Anyway, I have really taken my time on this latest rebuild. I'm in the timing stage before i run it on water. I did a static timning with timing light. 23btdc. Took it to launch, on trailer I set up timing, idle, etc while on trailer. While running and in gear (tried in neutral too manually moving throttle) I accellerated and the engine started kind of choking and over revving, like the engine was getting away from me as I advanced the throttle to approx 200-2500 rpm. Kind of had that YZ80 sound coming down from a super high rev..if you know what I mean. Engine rpm very slightly varies at idle.
Notes:
New block- holes ball honed and are spec. (couldnt find the water leak into Cyl1 on my old block which was steaming detonating #1 several times so I replaced..no more water jacket leak thank goodness)
compression 130 all cyl.
Spark-Good 3/8 gap
Fuel- Seems to be flowing well. Pulses beautifully when looking at the stream just before carbs.I detached briefly while running.
New Plugs
Fuel pump rebuilt
Fuel lines are new
All ignition components spec out using DVA
Rectifier charges my battery
Battery is new
New water pump
Carb just rebuilt- Floats, needles, seats. Floats adjusted perfect. Jet sizes are correct.
Prior to carb rebuild the same thing happened. I thought rebuilding carbs would fix problem b/c the top carb needle was worn.
PLEASE tell me there is something obvious I need to do.
THANK you!
Korbs