: My 440 SSX feels sluggish, is losing power, and/or stalls under full throttle take-off. What is the problem?
A: This can be caused by several problems. The two most popular causes rest in the intake and exhaust areas.
On the injector side, the diaphragms may be cracked which usually results in poor hard throttle responses or the loss of a/both cylinder('s) firing ability. Often, the engine runs fine at middle rpms, but stalls if not revved constantly. Dennis Kirk catalogs carry replacements for $8.99 per injector, part number 17-192 (see page 260 of '98 catalog).
Another injector-side problem may be in the intake reeds. Remove the injectors (carbs) from the engine and inspect the reeds for cracks or other abnormalities. Replace if necessary. Dennis Kirk carries Boyesen Power Reeds (part no. 18-0176) for $54.99 per engine (3-petal reeds). See page 257, '98 catalog.
Also check the high-speed and low-speed screws for proper adjustment. The manual does not offer proper starting points for the adjustments, but says "if your engine is four-cycling [boggy] under full throttle, your mixture is too rich and requires turning your high speed adjusting screw in (clockwise). Never turn high speed adjusting screw in more than an 1/8 turn at a time. If your engine seems to slow down under full throttle or backfire, you are probably running too lean." the high speed screw is the bottom T-shaped screw. The round, slotted screw in the middle is the idle mix screw.
Exhaust side problems originate from loose mounting flanges, bent ball sockets, rusted and missing internals, and/or cracked exhaust parts. Check all of the above. I had a slight crack down the seam of my exhaust manifold that killed performance of my SSX and was evident from the oil spray accumulating under the hood and around the crack. A simple weld by a local manufacturing company for about $20 fixed everything. Stronger and/or additional springs at the ball coupler help minimize leaks from that area.
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