Hello group. I was hoping someone out there might have some ideas about a problem I am having. As I have come to find, it seems few people have expertise in the area of Suzukis...
I have a 1988 Suzuki 200 Exante (200/S) two stroke engine (with carbs). The boat has been acting funny since last season, and has virtually no mid range in the RPM band. The engine starts right up and idles fine. Also, the engine runs fine at throttle settings of about 70% and greater (if you can get it to pick up without stalling). It will stall every time, however, at mid-range thottle settings (just runs rough and cuts out).
Early this season, I changed the plugs, changed a suspect coil, did a full tune up and lube (including water pump and lower unit lube), cleaned out the carbs, rebuilt the fuel pumps, changed all fuel filters, and replaced the fuel lines.
Dropped the boat in this week and it is still doing the exact same thing. Idle is fine (in or out of gear), but mid range just cuts out. If it can be coaxed up, the boat leaps out of the water and is fine from the 70% to 100% throttle setting. Just no middle. Checked fuel pressure and it is fairly constant with no signifcant fluctations or drops.
I have checked the TPS resistor and it has a nice linear resistance change through the stroke. I cannot find anything in the Clymer manual for setting the TPS on a carb'd engine, although it does tell you how to calibrate the TPS on the FI engines. And yes - I know I should be working from the Suzuki manual, but this is an old engine and I have yet to find an OEM book on it.
Has anyone had a similar problem with their suzuki? Any experience or input would be greatly appreciated. I am leaning towards an ignition issue (maybe advance or lact there of) since the fuel side of things seems good, but these engines are not very user serviceable as far as ignition (everything is computer controlled).
Thanks for reading and any input would be greatly appreciated!
Dennis
I have a 1988 Suzuki 200 Exante (200/S) two stroke engine (with carbs). The boat has been acting funny since last season, and has virtually no mid range in the RPM band. The engine starts right up and idles fine. Also, the engine runs fine at throttle settings of about 70% and greater (if you can get it to pick up without stalling). It will stall every time, however, at mid-range thottle settings (just runs rough and cuts out).
Early this season, I changed the plugs, changed a suspect coil, did a full tune up and lube (including water pump and lower unit lube), cleaned out the carbs, rebuilt the fuel pumps, changed all fuel filters, and replaced the fuel lines.
Dropped the boat in this week and it is still doing the exact same thing. Idle is fine (in or out of gear), but mid range just cuts out. If it can be coaxed up, the boat leaps out of the water and is fine from the 70% to 100% throttle setting. Just no middle. Checked fuel pressure and it is fairly constant with no signifcant fluctations or drops.
I have checked the TPS resistor and it has a nice linear resistance change through the stroke. I cannot find anything in the Clymer manual for setting the TPS on a carb'd engine, although it does tell you how to calibrate the TPS on the FI engines. And yes - I know I should be working from the Suzuki manual, but this is an old engine and I have yet to find an OEM book on it.
Has anyone had a similar problem with their suzuki? Any experience or input would be greatly appreciated. I am leaning towards an ignition issue (maybe advance or lact there of) since the fuel side of things seems good, but these engines are not very user serviceable as far as ignition (everything is computer controlled).
Thanks for reading and any input would be greatly appreciated!
Dennis
