hi all, how can you tell if ye regulator recifier is not working as my bike fell off the stand with seat unit off and whacked the rectifier, my nc30 revvs shit with it plugged in and the same with it but idles good tho. i dont have a multi meter 2 check it, i was given an yamaha r6 recitier i plugged it in and blows main fuse..

bike will run with or without reg/rec

your fuse blew as the neg/pos on the yam re/rec is reversed compared to the NC one.

if its not working can it make a difference to the way the bike revvs ??

no - if you have a charged up battery it does not make any difference

you still having the cut out at 5.5k revs?

It is the CDI not seeing the speedo....we've already gone over this!

Where you at?

yeah just wont rev cleanly i checked near enough everything im at oswestry shropshire.

ive just tried warming the bike up all 4 pipes hot,turned it off and disconnected the black box behind the speedo started it up and 2 b honest does sound the same so ye most probably right but how can i find out 4 sure,is thier a way 2 bypass it and make the cdi think its working?

What black box?

Take that out completely and plug the speedo directly to the loom. That box sounds fucked.

its the little connecter behind the speedo clock ?

Attached is bypass circuit from this forum that you can use to prove the speedo is the problem.

ant75 wrote:its the little connecter behind the speedo clock ?

Aye, bypass this - it is an aftermarket bit and has proably failed.

The speedo as a tiny 2 wire connector that plugs into the loom in the big bundle you'll see if you have the nosecone off.