Thread: 93 SL650 Bogging Under Load...
05-23-2009, 08:50 PM #1
- Join Date
- May 2008
93 SL650 Bogging Under Load...
In case you were not aware of my ongoing issues and history on the ski, you can check up on my build thread...
Its a 93 SL650 with 750 pistons and jugs, stock bore. Good compression numbers across all 3. It has a used 780 carb with a built in return restrictor, fresh diaphragms, the internals look good. To be honest, im not even sure what jets im running... I think they were 95 750 stock jets. It has a 93 drypipe, TDR waterbox, stock F/A, replaced stator that ohms out good...
It always ran great on the trailer, and never ran right in the water. It would have throttle response up to about 1/2 throttle, and beyond that produces a bogging sound and it sometimes wants to die. It did this with the stock 120/120/30 compression (yes, 30), and carb, and is STILL doing it with new pistons and jugs, and a new carb, reeds, heads...
Heres a video of what its doing on the water. If it sounds odd at idle, disregard that, I was messing with the carb settings.
If you pump the choke, it takes off RIGHT away generally. It has 1-2 PSI fuel pressure at idle, and im not sure what its making currently at WOT, but im sure its 3-5 where it was before, assuming you pump the choke. It will go for about 5-10 seconds at WOT after you pump the choke, then it usually goes back to its 1/2 throttle bogging state, or starts to bog HARD and requires finesse to keep it running. Its becoming increasingly obvious that I dont know what im doing, and I cant figure out how to make this thing work! HELP!
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