Re: Suzuki DT225 idle
butter one<br /> not sure on the 03 model, on the years prior 2 stroke EFI single throttle body that screw set the TPS voltage at idle as well as the shutter angle at idle, most EFI motors dont set the idle by a stop screw it sets the TPS voltage and you can set it with the throttle body on the bench.<br /> double check your service manual.<br /> most EFI motors have several sensors a TPS includedthat provide information to the ECU regarding throttle angle,RPM, engine load ,via a map or intake air pressure sensor, and engine temprerature as well as intake air temperature.<br /> by using feed back from all the sensors the ECU's basic fuel and timing map is corrected to insure a stable idle and RPM throught the RPM range.<br /> if it slows down slightly at idle the ecu should correct it.<br /> thats why most EFI motors do not have an idle screw.<br /> it confuses the ECU due to the raise in TPS voltage and the drop in intake air pressure due to the shutter angle increasing.<br /> this may or may not all apply to suzuki's but its a basic EFI.<br /> so far yamaha is about the only US outboard that uses an oxegen density sensor in the exhaust stream to further alter the ECU's fuel map.<br /> thats why I say with EFI it either works as designed or its broke. there are really no periodic adjustments or tweaks to be done in normal operation.<br /> so before tweaking that screw double check your service manual or you could create more issues than you solved.
