Rev counter going bonkers

slimtim · 09 July 2006, 20:02

On the way back from priory bay yesterday, my rev counter started doing odd things. I had been cruising all the way at about 4-4500rpm then the last bit I decided to give it some welly and trim her out.

I suddenly noticed that as I accelerated up, the rev counter needles quickly dropped almost to zero! If I then reduced throttle, the rev counter went back up again! After a while it seemed to sort it self out, but any ideas why it did it and how I stop it happening again/fix it?

The engine revs sounded fine by the way, so something wrong with the signal.

Thanks

Tim

Jizm · 09 July 2006, 20:24

chack the signal connection is good, if not then the rev counter maybe a little dodgy. Was it new, and do you have a temporary one you can rig up and try?

slimtim · 09 July 2006, 20:34

Quote:

Originally Posted by Jizm

chack the signal connection is good, if not then the rev counter maybe a little dodgy. Was it new, and do you have a temporary one you can rig up and try?

I bought it new yes and unfortunately I don't have another to check it! I will check the connections, thanks jizm.

I guess this is not something that happens very often.

simmons0 · 09 July 2006, 21:00

We had a similar thing happen, the rev counter would jump between the correct rpm and 0 whenever it got choppy. Fixed it accidently when fitting the CD player so i assume it was the earth that had come loose.

Hope your solution is that simple!
Harry

slimtim · 09 July 2006, 21:05

cheers harry, perhaps a connection has come loose after the bumping it got from the waves.

codprawn · 09 July 2006, 21:57

Mine was doing the same - ripped out the bullet connections on the ignition and soldered and heatshrunk the connections - perfect now.

slimtim · 09 July 2006, 22:00

Quote:

Originally Posted by codprawn

Mine was doing the same - ripped out the bullet connections on the ignition and soldered and heatshrunk the connections - perfect now.

Ok, so it sounds very much like a connection problem. As it happens, I did the same codders. Replaced the bullets with inline crimped connecters, heatshrunk and self amalgamated...so shouldn't be a problem there.

codprawn · 09 July 2006, 22:03

Quote:

Originally Posted by slimtim

Ok, so it sounds very much like a connection problem. As it happens, I did the same codders. Replaced the bullets with inline crimped connecters, heatshrunk and self amalgamated...so shouldn't be a problem there.

Don't like crimped - really don't - nothing beats solder if done right - you could always add some solder to the crimped ends.

fast fred · 10 July 2006, 12:51

if the rectifier goes, it will mess with your tach, kinda like what you said yours was doin.