Has anybody had any problems with the regulater/rectifier overheating I have a new one from Dave silver and new coils as I thought it was the coils packing up get about 6 miles reg/rec gets red hot won't run leave it too cool down then runs fine but heats up even quicker my original reg/rec damaged my ECU anybody any ideas,thanks James

Maybe try running through the Electrex fault finding guide in the Workshop on the main site?

Early 90s Honda reg/recs have been known to be a weak point.

http://www.nsr-world.com/workshop/
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Andy.
NSR-WORLD.COM

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If you don`t mind me asking..........How much did the regulator cost you ?

Could be the generator windings. It might be worth checking the resistance of each phase
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Why do things simply when you can complicate them

You must use the model with built in cooling fins. The original does get very hot and especially if not connected well with the chassis

Hi All,

Sorry for the dumb question but I'm pretty sure I need to put a new regulator in my MC21 but I can't seem to find where it is? is it under the seat with the PGM unit or somewhere else??

Thanks

You'll be able identify it from this diagram. On mc18 it's on the left side of the sub frame near the battery
https://www.cmsnl.com/honda-nsr250r7-1990-l-japan_model49620/partslist/0139.html#.W7CHgGBFw0M

Superceded part https://www.cmsnl.com/products/reg-rectassy_31600mv4010/#.W7CIX2BFw0M
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Why do things simply when you can complicate them