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I have a 94 STX, starts right up and runs well.
The problem that I have been having, that the dealer cannot seem to fix, is that one cylinder will foul out. It is *always* the PTO side, not the clutch side, that fouls out. Here are the circumstances:
Crusing around on trails just fine. Hit the lake, open it up and zoom for a while. When I get back up on the trail after WOT, and try taking off again, the PTO side will instantly flood out. Pop in a new plug and it will take off again until the next WOT/resume, where it will flood again. Fresh gas, any air temp will cause this.
Here's what I have tried:
Rebuilt both fuel pumps, which are run in parallel and feed the two carbs.
Relocated the fuel pumps to just beside the airbox and under the steering bar from the LAME position under the engine, where it is required to remove the engine to access for service. This move shortened the fuel line path by about a foot to each carb, resulting in better starting.
Cleaned both carbs thoroughly. Like I said, it starts right up and revs well.
Dropping the needle 1 setting on the PTO side.
Swap carb bodies, remembering to change jets because they are different.
Changed out primer, thinking that fuel may be leaking past the diaphragm.
Cleaned both RAVE valves.
Compression is identical (or nearly so) in both cylinders.
I have worked for a couple of dealers in the past, and I just cannot figure this one out. Asking around gets me the same answers that I have already tried, followed by a shrug.
I am to the point that I am just going to have to tear the motor down and replace *everything*.... I hate to do that, because it does run very well before flooding out, I believe that a rebuild is unnecessary.
Any ideas before the teardown???
The problem that I have been having, that the dealer cannot seem to fix, is that one cylinder will foul out. It is *always* the PTO side, not the clutch side, that fouls out. Here are the circumstances:
Crusing around on trails just fine. Hit the lake, open it up and zoom for a while. When I get back up on the trail after WOT, and try taking off again, the PTO side will instantly flood out. Pop in a new plug and it will take off again until the next WOT/resume, where it will flood again. Fresh gas, any air temp will cause this.
Here's what I have tried:
Rebuilt both fuel pumps, which are run in parallel and feed the two carbs.
Relocated the fuel pumps to just beside the airbox and under the steering bar from the LAME position under the engine, where it is required to remove the engine to access for service. This move shortened the fuel line path by about a foot to each carb, resulting in better starting.
Cleaned both carbs thoroughly. Like I said, it starts right up and revs well.
Dropping the needle 1 setting on the PTO side.
Swap carb bodies, remembering to change jets because they are different.
Changed out primer, thinking that fuel may be leaking past the diaphragm.
Cleaned both RAVE valves.
Compression is identical (or nearly so) in both cylinders.
I have worked for a couple of dealers in the past, and I just cannot figure this one out. Asking around gets me the same answers that I have already tried, followed by a shrug.
I am to the point that I am just going to have to tear the motor down and replace *everything*.... I hate to do that, because it does run very well before flooding out, I believe that a rebuild is unnecessary.
Any ideas before the teardown???