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lower throttle plate stop screw ( calibration screw )

T

tedbIII

New member
Hi
I'm working on a 1998 200hp E.F.I serial number 0G725281. This motor has been through the mill. im down to the last few things before getting it running, and I noticed that someone has messed with the throttle plate stop screw on the lower plates. i believe that this is a calibrated adjustment and should not have been tampered with. i'm wondering if any one has the adjustment procedure for this screw. its the stop screw on the lower throttle plate. the teeny tiny one with the lock nut and what remains of some locking paint. any help would be appreciated. the way it is now you have to turn the idle adjustment screw all the way in to get it to idle at all. and the lower plate stays shut.

Thanks in advance for your help
 
I think this is what you are after - if not repost and I will see what else I can dig up...

200 efi throttle plate.jpg
 
That one wont work as its for a 3.0L... To adjust....(A) Loosen cam roller screw so its loose on cam follower(B) Back out idle speed screw till shutters are closed. If not back stop bolt out till shutters are closed as it should just touch(C) lock stop in place and set idle speed then set roller to cam follower
 
I would like to thank you for your help. I understand. the bottom set of plates is like the primaries and the top are like the secondary. they use the top set as a idle air bypass to adjust your base idle that way it doesn't effect your throttle poison sensor when adjusting you base idle. so i will be setting the bottom plates closed , adjusting my throttle cam position to the line, adjust my throttle position sensor then using the idle adjustment screw on the top throttle plates to achieve my base idle by cracking open the top throttle plates.

If i might ask one more question it would be appreciated. is there a spec for the length of the rod that goes from the cam plate to the throttle-control lever?
 
i understand that this is very critical and have the service procedure for doing this thanks again for all the help. i bought this boat with a blown motor. when i pulled the power head the motor was filled with sand. the oil gear was stripped. it had 2 melted pistons and one bad bearing journals on the crank. i've rebuilt the power head. including new pistons and crank and bearings. i rebuilt the lower unit wit new impeller kit and cleaned all the sand out of motor. im down to the final adjustments before remounting the power head. I've read extensively and do appreciate all the help you guys have given me. I've also repainted the entire motor and i'm putting new emblems on it i will take a picture when i'm done and post it, along with some of the problems i found in it. thanks again for your help hope to have the water test run by Thursday this week.
 
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