Idle Screw Adjustment

[olemissrebelyell]

What's the best way to adjust the idle screw on a 97 speedster? I'm assuming that you have to have the flame arrestors and air silencer box on while doing this. It looks like the idle screw is pointing upwards so I wasn't sure what the best way to do it is. Both engines have good compression around 135-140 psi. The RPM's are just low at idle and the boat seems to be running rich. This boat was given to me and this is my first boat so I'm new to a lot of things but I do have a service manual for help. Any advice would be greatly appreciated.

 

[olemissrebelyell]

Carb Expert?

Who's the carburetor expert on this site on the 717cc engines? I don't seem to have much luck getting responses on any of my posts so maybe someone can direct me to who's the best person on here to talk to. My guess was either KustomKarl or SeadooSnipe. Thanks again....

 

[97 See Doooo]

I hope this helps , , it's from snipes korner . .

http://www.seadooforum.com/showthread.php?t=4151

And in particular this c/p

LOW SPEED ADJUSTMENT 0% to 35% throttle range - In 90% of all cases, the low speed mixture screw can be accurately set without riding the machine. Secure the boat on a submerged trailer or standing in about three feet of water. With the engine completely warmed up, set the carb up to a slightly higher than normal steady idle. Turn the low speed mixture screw in or out in 1/4 turn increments. As you get closer to the ideal setting, the engine rpm's will increase. If the idle speed is increased by this mixture adjustment, turn the idle speed adjustment screw down and continue the same process in 1/8 turn increments. At the ideal mixture setting, 1/8 turn in a richer or leaner direction will cause a very un-steady idle and cause the engine to die. To confirm your perfect low speed mixture setting, touch the kill button during idling...and then touch the start button about ten seconds later. The engine should restart instantly and idle steadily without touching the throttle.

 

[kustomkarl]

Typically if the carbs are set already and the idle is low, just adjust the idle. First set the carbs to stock settings. Low speed screw should be set to "1 1/2" turns out. You can identify it as it has a pin through it. The High Speed screw should be set to "0" It has a plastic cover on it to prevent it from being turned out more than 1/4 turn. Once the carbs are adjusted use the Idle screw adjustment to set the idle. If you look on the linkage plate you will see and feel a screw that adjusts both carbs. Follow the throttle cable to the linkage and the adjustment screw. It is close to where the cable attaches to the linkage. The post above describes how to fine tune the carbs.
DO NOT USE THE LOW SPEED SCREWS TO ADJUST THE IDLE!
It will lean out the engine and it could lead to a seizure condition as the RPM's will go up as it leans out the engine. The engine should Idle at about 3000 Rpm on the trailer running on the hose and at 1500 rpm's in the water due to the load on the jet pump impeller from the water. If you do an adjustment on the hose, don't let it run for more than 5 minutes as it will over heat the jet pump bearings and seals as they get cooled from the water. Review proper proceedure to running your seadoo on the hose...start engine turn on water... shut off water... kill engine, so no water floodes the engine. I hope this helps. This information is in your manual too if you have a real shop manual from seadoo. After market manuals make a good door stop, due to never enough information.

Karl

 

[olemissrebelyell]

Thanks for the info See Doo and Karl.....I'll probably just put it in the water on a landing to do the adjustments. Am I correct in saying the flame arrestors and air silencer boxes have to be on to do these adjustments?

 

[kustomkarl]

No you can do the adjustments with them off, for clearance, be careful of fumes in the hull. The spark arrester and air box are there for safety reasons of a back fire. just do adjustments at an idle. the High speed screws should stay set, so no need to rev up the seadoo to adjust. Tie it down good, and have a helper around for safety reasons...



Karl

 

[olemissrebelyell]

I appreciate the help....I'll let you know how it goes after I do the adjustments tommorrow.

 

[olemissrebelyell]

I forgot to ask this earlier.....do you think any adjustments will need to be made to the oil system if the idle is raised? I just changed the oil filters to so I'm thinking I may have to bleed the lines now as well before starting the engines to remove any air in the oil lines. Sorry for all the questions....I'm learning as I go.

 

[kustomkarl]

If you just filled the new oil filter with poil and put it back in the oil lines, then you shouldn't need to bleed anything...if you gort air in the oil lines, you need to bleed it out if you see bubbles.

Karl