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A few years ago I had some real issues with my Yamaha MT-01's rectifier the original one burnt out and I replaced with both non OEM and and OEM one just to have them both become faulty!
After this my confidence of the rectifier was knocked and I decided to give the "Ulitimate Rectifier" a go
Rectifiers seem to be a weak point on Motorcycles!
Rectifiers seem to be a bit of a problamitic part on most motorcycles, not just the Yamaha MT-01
So it seems surprising to me that they have not been better developed by manufacterers to deal with the extreme conditions that they have to deal with!
Recifiers main job is to convert AC to DC basically smooth out the electricity supply from the generator on your bike so that nothing gets fried!
To do this requires lots of resistors and such like which means this unit is going to get very hot, to deal with this manufactures put these in places of high air flow, like the front or your bike or under a side panel. In some cases radomly infront of the back wheel??????
Anyway regardless of this they do seem to wear out, and to "rectify" this , UG (ultimate rectifiers) have made a produuct that deals way better with the horrible conditions that we put them through!
Ultimate Rectifiers genearally have a bit more "smart" in them and when they feel the going is getting too hot, they will shut down for a few minutes, abviously your bike carriers on running as your battery is happilly charged.
Then once cooled they will come back on, suppliying your bike as normal again.
On my Yamaha MT-01 I have a voltage meter connected, I got it after my first Rectifier failed and left me stuck, the voltage meter just gives a first glance idea that your system is working. Most bikes will charge at around 14v!
Now that I have the UR fitted the volts just stick at a vary stable 14.3 volts, before this they would be up and down.
I have had the UR fitted to the Yamaha MT-01 for 3 years now, and not had any issues at all.
I am still paraniod and still keep an eye on the voltage meter but this UR unit has really made a difference and I am happy to recomend it, really easy to fit too.
They make lots of different types for lots of different bikes so do check out thier website ultimaterectifier.com/
Ultimate Rectifier for the Yamaha MT-01
UR is a really easy straight swap on the Yamaha MT-01