Tweet
First of all, you need to be checking your plugs. There are a few good posts that go into detail around here on plug reading and tuning. Next you should return to the standard settings as listed and start from there. What was your pop-off when you rebuilt the carbs? It sounds like you had a good running ski when you rebuilt the carbs. Why did you rebuild them? Also, make sure all three carbs are in sync with each other. This can be frustrating, however very rewarding when done corrrectly. I'd start off reading Bryan's post on tuning and use plug readings to help you tune. If you have any more questions, don't hesitate to ask. Good luck.
-
-
Forgot to answer your questions. If rpm's are holding steady, then that is an INDICATION that you are NOT lean on top. You need to do a wot plug chop to find out. NORMALLY the rpms will SLOWLY go down as the piston starts to expand so much that the friction (read damage) is causing it to slow down. Also the high and low circuits are mostly independant of each other, that is why they must be tuned seperately. They do overlap a little in the middle and that is probably where you are finding your rich spot until it clears it and then takes off. Just read the tuning guide found at this site and that should point you in the right direction. -
Rebuilt carbs cuz it ran like poop for the first few times out this season. Figured it was time anyway. I have read everything on this site 3 times [img]smile.gif[/img] Been checking plugs...that’s why I said they look rich at lowspeed. Think I am going to start off baseline like you said. Not sure what the pervious life off this machine was, haven’t had it long.
I did a plug chop...looked golden brown, no dark brown or black. Sound about right at high speed? Or should they look like the pictures posted by Bryan at all speeds?
Thanks for the help Tom. Going out right now for more testing. Will let you know.
Tim
[ June 29, 2002, 11:27 AM: Message edited by: Tazass ]Comment
-
96 SLT 780, The boat is all stock. Rebuilt carbs few days ago.
1. What is the average max rpm I should expect from this machine? It would average around 6380/44 mph. sound about right? It holds 6380 good and steady so I don’t think I am to lean at top rpm.
2. It had bad hesitation off idle when id snap to full throttle. I open the lowspeed screws an 1/8 at a time until it accelerated good from an idle. Now that its nice and snappy off idle, my problem is this. I hold it at 20% throttle/3500 rpm for a while, then open it to full throttle it goes "blah, blah, blah" then takes off like a bat out of hell. Still to lean on the lowspeed screw? Seemed to get worse *** I went richer, so I didn’t go anymore then 1 turn out. Lows were set to ½ when I rebuilt carbs, book says 1-3/8s out…sorta strange? Should it run really rich in order to get good throttle response at lowspeeds? Plugs seem pretty rich at lowspeed.
3. How does the lowspeed screw affect highspeed circuit? It seemed the more id open the low to try and get rid of the 20% blah, it would get to what I think is max rpm a little strong/quicker. If I adjust the lows does that mean I have to readjust the highs? Is that added fuel from the richer lowspeed settings also present at high rpms?
Thanks all
Tim
[ June 29, 2002, 12:26 AM: Message edited by: Tazass ]Comment
-
Ideally the plugs should be the perfect color at all throttle ranges, but that is imposible on most setups, so you have to go for the good balance.Comment
-
Well, I set the carbs to baseline settings and it ran Great!! Much better then yesterday. The plugs didn’t look as great though. I did a few plug chops and the plugs come out pretty clean looking. I drove about 2 hrs on the new plugs. I Checked them about 15 times, throughout the whole throttle range. The only time good color got on them was at idle and alittle off idle. I guess I don’t get it, runs awesome with stock settings yet plugs tell me to richen up
Tim
[ June 29, 2002, 06:43 PM: Message edited by: Tazass ]Comment
-
Yes, I have that problem too, sometimes. I just put a few hours on them and check them constantly for signs of leanness. They will eventually start to color up quite nicely. Glad to hear that your ski ran a lot better. Did you check and double check and triple check the sync of the carbs? I can stress this enough to people. I had a buddy of mine who couldn't figure out his ski so I looked at it for him. Come to find out he just slapped the carbs back together and didn't check the sync of the carbs. The rear carb wasn't opening but about 80% and the middle about 90%. Fixed him upo and now he is been fine for over a year now. Hopefully if the wife will let me I can make it to the lake tomorrow. Today all I did was house work and laundry.
LOL!!
Comment
-
LOL, mine was gone for the day, I spent 6 hrs out there [img]tongue.gif[/img]
The carbs are in perfect harmony, check them again today.
Thanks again boys
TimComment
Comment