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Author Topic:   V6 Looper high RPM problems....
peteinsf posted 05-23-2003 02:06 PM ET (US)   Profile for peteinsf  
The Challenger's port 200HP has a strange problem and since all of the parts are expensive I thought I would bounce it around here first...

Above 3K RPM the tach start jumping around, by 4K it goes from 0 to full scale pounding the stops. The motor idles OK and run smooth all the way to 4500 -> 5000. The starboard motor will go above 5K fine.

Any ideas where to start (I was hoping not to buy more then one major part. My guess would all of or one of the following; stator, powerpack and maybe a flywheel?


(1995 Evinrude 200-STL)

JBCornwell posted 05-23-2003 07:12 PM ET (US)     Profile for JBCornwell  Send Email to JBCornwell     
Hi, Pete.

What is the engine doing while the tach is going crazy? If it is running well and responding to the throttle you either have a bad tach or a bad signal going to it.

Switch the leads between the tachs. If the same tach still jumps around it is the tach, if the other one now jumps around it is in the engine where the tach signal is generated. I don't have a manual on your engine, but I suspect that the signal comes from the stator.

If the engine is acting like the tach, I would also look at the stator.

Good luck.

Red sky at night. . .

jimh posted 05-23-2003 07:21 PM ET (US)     Profile for jimh  Send Email to jimh     
If the tachometer guage is one of those with a selector switch on the back for matching it to the number of poles in the alternator, I would suggest operating the switch a few times, going back and forth between the desired selection and adjacent selections. This may help.

JB's suggestion to swap out the connections with the other Tachometer guage is a good one, too. That should help isolate where the problem is located.

Sal DiMercurio posted 05-23-2003 07:26 PM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
It's either the tach, or rectifier.
Do you notice the battery on that engine not being as hot as it should ?
If so, it's the rectifier.
Do as JB says by switching the tach wires with the other engine & if that particular tach is smooth & the other now acting up, time for a new rectifier on the crazy tach engine.
To find the rectifier, just follow the gray wire from the tach , to the rectifier, [ gray wire is always the tach wire ].
If that engine has the 9 amp charging system, the rectifier will cost $65.00, if you have the larger charging system, it's gonna cost you about $280.00.
peteinsf posted 05-23-2003 11:20 PM ET (US)     Profile for peteinsf    
JB, Jimh,

The motor runs smooth but it tops out on power when the tach is jumping. The motor with the good tach gets 750-1K higher WOT rpm.

I swapped the tachs between the motors (before I noticed the power loss) and it follows the motor. I also checked all the connections back to the rectifier black box.


Is there a way to tell if it's the rectifier vs the stator?


Sal DiMercurio posted 05-23-2003 11:39 PM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
To check the rectifier start the engine & dissconnect the gray tach wire from the back of the tach, check that wire to see if it's getting a full 12 volts from the rec., if it isn't, the rec is bad.
I don't understand what you meant be the engine tops out when the tach is jumping.
Do you mean it goes to wot ?, or runs rough ?
If it runs rough it could be your stator.
peteinsf posted 05-24-2003 12:04 AM ET (US)     Profile for peteinsf    

Not rough, smooth but less power (lower RPM at WOT) then the other motor...


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