By: news (offline) Wednesday, 20 May 2015 @ 08:14 AM ICT
The starter motor you looking for was also used for the 1999 and 2000 Yamaha TT250, the 2001 up to 2006 Yamaha TTR250, and the 2003 TTR225.
The original starter motor was manufactured by Mitsuba and was a PMDD type 12 Volts CW rotating starter motor with 9 teeth
The original Yamaha part number is 4GY-81890-00-00, or 4GY-81800-02-00.
As you probably know the Yamaha Serow 225 was never officially sold in Thailand, so parts will be difficult to find. You have one chance, as the starter motor was produced by Mitsuba Electric Manufacturing, which also has a factory in Thailand. So I would suggest you contact them... let somebody who speaks Thai call first to ask for somebody who can speak English.
Telephone 038-698 300
They're located at : 500/79 Moo 3, Hemaraj Eastern Seaboard Industrial Estate, Tambon Tasith, Amphur Pluak Daeng, Rayong 21140
By: news (offline) Wednesday, 20 May 2015 @ 08:24 AM ICT
If contacting Mitsuba directly not give the dessired result, you can also widen your search by looking for a Mitsuba PMDD starter motors 12v CW 9-spline shaft (or 9-teeth shaft).
Several motorcycle/ATV manufactures used this model, you maybe have to change the connection plug... but it will work perfectly. For instance the Polaris Trail Boss, Big Boss, Magnum, Scrambler, Sportsman used the same starter motor, and Polaris ATVs are sold in Thailand by a company called H20 Co., Ltd in Prapradang. Down side is buying your starter motor from Polaris will not be the cheapest option.