Question about 2003 Ducati 998
I recently noticed (as I was checking valve clearances) on my 998
That when opening the throttle the front butterfly seems to open fully but the rear butterfly stop short by a few degrees. In other words, front and rear butterflies do not open exactly the same amount. The bike has done 9k miles and apart from maintenance and valve checks, have never bveen worked on. It is in pristine condition, runs great and pulls strong well beyond the 10k redline. I have not had 4V desmo's before and therefore cannot compare power wise, but she feels rather quick to me. For what its worth, it has the 50mm Termi half system and matching ECU. Is this normal and just a result of the factory balancing exercise?,The length of the throttle linkage rod is set in the factory on a test bench. It is a brave person that messes with that linkage rod. What is more accurate is to do a cylinder balance using carb sticks to check if cylinders are balanced on idle. If they are out by one or two degrees at full throttle the difference is minmal and not something that an average street rider should worry about. (When is the last tiem you were banging off the limiter for extended periods of time?) At the same time check your throttle stop set screws to see if they are in the correct place. If the cylinders are balanced at idle I would not worry about it.,,,
Posted on Nov 10, 2008
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Posted on Jan 02, 2017
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ADJUSTMENT Although it is sometimes possible to reuse an old cylinder head cover gasket, in most cases it makes more sense to purchase a new one before beginning the procedure. Some vehicles may require the use of silicone sealant either with or without a new cover gasket. For more details, please refer to the cylinder head cover procedures in Engine & Engine Overhaul of this repair guide and refer to the gasket manufacturer's instructions.
See Figures 1, 2 and 3
For the intake valves: 1-4-5-8 valve clearance is 0.012 in. (0.30mm). For the exhaust valves: 2-3-6-7 valve clearance is 0.012 in. (0.30mm). The pivot locknut torque specification is 12-16 ft. lbs. (16-22 Nm).
Fig. Fig. 1: Check the valve clearance with a flat feeler gauge-Z24i engine
Fig. Fig. 2: Loosen the locknut and turn the adjusting screw to adjust the valve clearance-Z24i engine
Fig. Fig. 3: With the No. 1 piston at TDC, adjust the top set of valves FIRST; with the No. 4 piston at TDC, adjust the bottom set of valves SECOND-Z24i engine
Fig. Fig. 4: Cross-sectional view of an installed hydraulic valve lifter-4 cylinder engine
Fig. Fig. 5: Cross-sectional view of an installed hydraulic valve lifter-6 cylinder engine
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