So I finally got my 90 super jet with 760 engine running good at the local lake with a msl altitude of 1000 ft. Today I went to silverwood lake and it was a disaster. The lakes msl alt is around 3-4000 range. From the moment I set it in the water it would not start. Then the new battery died. I jumped it from a boat and the engine fired right up and ran fine for the 10 min journey to the days camp spot. After 30 min or so I tried to go for another ride, it would not start. Then the battery died. I jumped it with a boat again and rode but it really bogged down bad, then it died. The plugs looked wet and black, oily. Was it the higher elevation that killed it? The carbs were tuned for factory specs around 1000 msl altitude. I tried to lean the bottom screws just a hair but it made no difference and I did not want to get the adjustments all screwed up. Thanks for helping.
Super Jet Higher altitude causing starting/running issues?
- Thread starter Galaitoto
- Start date
It is an internal pressure. This will be invaluable if tuning a lot.
https://www.google.com/url?sa=t&sou...0QFjAA&usg=AFQjCNE3b-xPf2Qfak8gTiBme0HzF6kpBw
https://www.google.com/url?sa=t&sou...0QFjAA&usg=AFQjCNE3b-xPf2Qfak8gTiBme0HzF6kpBw
Well shoot, after reading about the pop off, I'm wondering if my mechanic understands the carbs in the first place. A few weeks ago after he tuned them to factory specs, I took it to the local lake and it had a lag or hesitation in the low throttle range, meaning coming from just above idle speed to before mid throttle it would bog down a bit, then it would take off. I called him and was told to tweak the low speed adjusters to work out that lag issue. This is what I'm concerned with now, having read the article, it says the low speed screw is for idle only. It then says if it's having issues accelerating, it's a pop off adjustment at this point right? I am not sure, I just needed to clarify this before I lose faith in my mechanic.
Pop off works in conjunction with your low speed screw. Don't lose faith in your mechanic. if I had more time I would explain more. But I am at work. Google is your friend, and so is Xh2o. I'm sure there will be more advice soon.