ebay
Try one off of a yamaha seca 400
try the yamaha seca store.
Maxim 400
It should be an 12N 12A-4A battery
The correct spark plug for this motorcycle is: NGK D8EA
0,263 litre 10W30 oil
my manual for '82 seca 400 says "Periodic oil change: 2.2 liters / 2.3 us quart .... With oil filter replacement 2.5 liters / 2.6 us quart"
According to WikiAnswers, the proper battery for a Maxim 400 (the Seca's sister) is 12N 12A-4A. I'm looking for one also. This is the same battery I used in my '72 Yamaha XS650 although it had a "-1" designation at the end.
the only place i have found is www.targa-acc.com there like 400
The best sprocket pair for the Yamaha Seca 400 often depends on your riding style and desired performance. A common recommendation is a 15-tooth front sprocket paired with a 45-tooth rear sprocket for a good balance of acceleration and top speed. However, for more aggressive riding or quicker acceleration, you might consider a 14-tooth front sprocket. Always ensure that the sprockets are compatible with your bike and your riding needs.
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According to the parts list, no, but they should be interchangeable. They just are built for their specific purpose.