I have a problem with the 1992 EVO is not running well at all ,it is ok for about first 30 seconds and after that it is just dying, with a twisting throttle on and off and I can just manage to keep the engine runing.
The fun part is that if I disconnect voltage regulator plug on primary cover(or primary housing whatever the name of that part where two pin goes in) engine runs perfect.
So straight to shop and got new one ,I was all pump up but after installation of new voltage regulator problem is still there.
I would like to ask you guys if anyone experienced similar problem and could help me fix my ride .

thank you all in advance

 

I had a friend bring his bike to me with a "similar" complaint. His bike had set for some time. Had fairly fresh gas in it with Sea Foam. I went over the simple things first. What I found was a bad battery and some really dirty connections at the battery and ground. I put a battery in it I had, cleaned all connections, and he's never had a problem since then. What have you checked?

 

Running ruff like a dog lol, just joking, first you need to find out if its a ignition, electrical, or fuel problem

 

To me your twisting the throttle to keep it going, sounds like a fuel delivery problem, maybe just getting enough gas in the bottom of carb for the accelerator pump to squirt gas, because accelerator pumps usually draw their gas from the bottom of float bowl

 

Do the simple cheap stuff first, the following items will cost you exactly nothing to do:

Remove the battery, charge it fully and take it to an auto parts store and have it load tested.

Clean all battery cable connection points, don`t just check to see if they are tight, remove and clean them.

When a known good battery is installed, perform a charging test.

 

I'm happy to report , I did as above suggested to check battery , got new one and bingooooooo ,bike runs like dream again , I was happy to change voltage regulator it was faulty too.
thank you all .

 

good deal, glad your got her fixed

 

Congratulations on figuring out your problem, letting us know about it and getting back on the road.
Despite the fact that you no longer needing advice, this post from Dan is SOOO worth repeating I'm adding it to this thread again. (with emphasis mine)
Take it from someone who had to learn the hard way. With any starting or "rough running" issues Be CERTAIN you have a GOOD battery before you go any further. Do it before you start replacing parts that you later find..you didn't need. (yea, yea, yea...I know...dumbazz me)
The second part of my sage advice is: Just because you have a NEW battery...doesn't guarantee that you have a GOOD battery. Last time I had to deal with starting issues, I put a new battery in the bike. New HD GelMat bought right from the dealership. That didn't solve the problem so I started replacing stuff. Eventually..someone smarter than me..( Like Dan) told me to try a different battery..try one that I KNEW was good. WHATTYA KNOW...when it was finally tested..My new HD GelMat battery was bad from the get-go. Dealership exchanged it for me, and I have a few extra parts on the shelf now.

 

[QUOTE=mike131;19694832]Running ruff like a dog lol,

RUFF was the dog of Dennis the Menace

 

Bad batteries can overload charging systems. Read about resting voltages and load testing. Load testers are cheap and simple (basically a wire resistor like a toaster heating element, a meter and a switch) and you can use 'em on all your 12v vehicle batteries. A voltmeter lets you perform a charging system test in minutes and I do those as part of my standard electrical troubleshooting since what's unmeasured is unknown.