The correct part number is 17610 from Advance auto in USA. From a Toyota 5SFE motor. Details are in post #24 from Taildragger.
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OK gents, it is time to share a few R3 trick and tips. This is the first - THE STARTER.
The stock starter on the R3 is a 1.2kw Denso unit that is a bit spendy (USD $737.32 plus shipping from BikeBandit). Here is how to fix a bad starter for $83.98, or upgrade to a 1.4kw unit (10mm longer, and 16.7% stronger) for $83.70... shipped to your door.
Many automotive engines use a 1.2kw starter, but have a cold weather option using a 1.4kw unit. This is exactly what we need for improved starting in cold weather, or with modified engines.
Remove your starter.
Remove 2 bolts holding starter motor to head plate.
Remove 2 bolts holding gear reduction and bendix to head plate.
Watch so that you do not lose spring and ball.
Clean gear reduction/Bendix and replace with new grease.
Order new starter from discountstarterandalternator.com in Georgia.
1.2kw - part number 280-0284 or 280-0281
1.4kw - part number 280-0283 or 280-0278
1.6kw and 1.8 kw units can be made to work as well, but these require a slight amount of machining.
Remove the same four bolts from new starter.
Remove gear reduction/Bendix.
Install gear reduction from stock starter on new starter. Make sure that spring and ball go under Bendix.
Replace the 4 bolts.
Install on engine.
Ride on.
If you are really in a pinch, you can use these same part numbers at the local auto parts shop - they can be found on 1999-2005 Toyota Celicas (for one).
I hope this helps,
-Wayne