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Discussion Starter #1
While I had the old girl fired up today I had a volt meter on the battery. It never showed anything over battery voltage. Not that I ran it very long. I followed the diagnostic flow chart for charging system diagnosis. Looks to be the regulator/rectifier. As I am trying to keep the costs down until I know it will live I would like to avoid spending over a hundred bucks on a new OE part. So the question is, will the '88 and newer part fit the earlier setup?
 

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I do not have direct knowledge, but looking on line I found three different fitments:
1987
1988-2000
2001 up

Maybe you will better response in the morning

Stator resistance good? Not grounded?
 

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I’ve never owned an 87, so you might want to wait for 87 owners to chime in.

Amazon has a cheapo version that is advertised as 1987 model. They list the same part # as Partzilla. It has a 4 wide connector vs the 2 X 2 connector on 1988+ models. See what connector your bike has. Use caution because the 87s have electrical systems unique to that model year only.

https://www.amazon.com/Electrical-AYA6021-1KH-81960-00-00-2JA-81960-90-00-2JA-81960-A0-00-x/dp/B008CQR8TU/ref=sr_1_1?s=automotive&ie=UTF8&qid=1547484130&vehicle=1987-1210-20056-20-----13941------9-0&sr=1-1&ymm=1987:yamaha:tw200&keywords=regulator

Cheers and good luck. That didn’t take you long to get it running.
 

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Discussion Starter #4
Thanks guys. I know the 87 has a different electrical system. That's where the questions come in. According to the manual and my meter the stator passes inspection. I've seen a couple different units advertised for the 87 and up. But not sure I can trust that because of the different stator. Was hoping someone with more knowledge on the subject that I would have an answer. Still looking around trying to find an answer.
 

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I think BadgerFlorida covered it.
1987 has a smaller unit, appears to be different mount and has a different connector.
Looking on-line, most have photos to compare.

Based on this, an 87 is the choice.

If you were to bypass the connector and mounting differences, the internals are likely different.
I would not want to chance frying a stator or burning out bulbs.

You many still get a forum member with an 87 for more insight, so that is just my logic for now
 

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I have an '87, but don't know the answer. Sorry.
 

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Does yours look like this?
1987 regulator.jpg

Or does it look like this (1988-2000)
1988-2000 regulator.jpg

Or does it look like this (2001 up)?
2001 up regulator.jpg
 

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Well, it appears to have four spade blades in parallel, but the width of the 7 cooling fins may differ.

Looks the same as the one in this thread, although a photo from the connector end of yours should assist verifying.

https://www.tw200forum.com/forum/technical-help/61138-1987-tw200-voltage-regulator-wiring-help.html

It certainly is not compatible with 1988-2000, nor 2001 to current.

Therefore you have at least three options:

1. Purchase an aftermarket from ebay/Amazon for about $30

https://www.ebay.com/i/362034293612?chn=ps

2. Purchase a genuine Yamaha part from Partzilla for $111.29

https://www.partzilla.com/product/yamaha/1KH-81960-00-00

3. Purchase one from a dealer for $168.99 1KH-81960-00-00 superseded by 2JA-81960-A0-00
 

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The four spade connectors all in a row do not match what I have. It is two rows of two on mine. Like shown on the later models. I'm thinking the '88 and up version is worth a try.
Look at the actual label on the headstock for the manufacturing year. Sometimes the titles are wrong.
 
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