Anyone had any problems with R1 regulator rectifier particularly one track days.

Me and afj did a track day yesterday and both had problems with charging (haven't looked into it yet but suspect the rectifiers)seems to coincide with the end of the day when we were both running with lights on. Anyone had this before?

A bit more detail mine is a 4xv so a different rectifier to Alans. My dash warning came on luckily it was still charging but only just enough to get me home.

Alans is a 5jj if i remember right and stopped charging completely so had to be recovered

Think it a general issue to do with overheating and how well it has been heat sinc'd or has it got a fan on it to keep it cool or both, believe the honda superdream is the normal replacement as this is pretty robust but I'm sure the experts will be along shortly.

Cheers

Rich

R1 rectifiers are generally much more resilient than those on blades but will benefit from proper heat sinking and airflow.

Stators can go and have similar symptoms. Can be fixed but a pain as an engine out job normally so that a puller can be used.

- Jim

I knew the blades have problems but never heard of an R1 failure.

Just seems strange that ive not had a problem in 5 years or so then first track day it plays up.

Its mounted on a decent heat sink. Going to get a rectifier and try that first hopefully that will sort it, if not i have an engine for spares so have a Stator.

To test the stator windings, use an ohm meter, should read about 4 - 6 ohms between any two of the three wires.

Test each one to ground too, any continuity to ground, or deviation in above readings, the stator is shot.

The rotor is removed using a large bolt, M14 x 1.5 If I remember rightly when I did my 5JJ.

If it ends up being your stator I have the proper "tool" you can borrow. It is very similar to a normal bolt except the end is domed and it does make a difference.

I had a right mare getting mine off (I posted a thread about it if you search)

I think if you look in the service manual the resistance is quotes is a LOT lower than that and a lot lower than you can accurately measure directly with a multimeter.

Better idea if just to put your multimeter on AC with the engine running and check to see what is being generated. It rises with revs but basically mine was making next to feck all and it didn't rise with revs...

Agree its a pain to get off, I machined a recess in the bolt for a 6mm ball bearing.

Resistance may well be less, haven't rooted the manual out, but I measured it ok with an avo, my insulation had burned and was shorting to ground.

That's interesting looking like it could be a stator then will have a look tomorrow before i get a rectifier.

Thanks for the offer David but i have a homemade tool i used when i did the gearbox, mine was a right b**ch to get off as well.

Temptation got the better of me so just been out in the garage + the fact a rectifier was finishing on ebay

Looks like the stators ok couldn’t get a decent reading with my multimeter but none of the white wires go to earth so started it up and the voltage increases with revs on all 3 wires didn’t rev it much to see 20 volts.

Looks like my lucks in tonight stators ok and ive just won a rectifier for £15.50 inc postage

Bigger heat sink and more air flow for this one.

Cheers Guys.