V-Twin Horizontal OHV Engine with Electric Start - 610cc, GX Series - Answered Questions & Fixed issues

If it had set for a time, the jets may be obstructed. Have the carb rebuilt. Also make sure that there is fuel flow to the carb.

Hi, if it's a newer style bike, it could be like a newer car. Not possible to change the timing.

Check the flywheel keyway, they will shear and cause the problem you are encountering. Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/darryl_24e8d8d43e609e3c

The voltage regulator may be bad, will need to unplug magneto and use multi meter and test magneto for voltage output on milliamp scale with the engine cranking, If voltage is present when cranking then the voltage regulator is bad , if no voltage then the pick-up coil and stator will need to be replaced. Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/darryl_24e8d8d43e609e3c

Pull the spark plugs out and check their color - as this will tell you if the engine is flooding out or you have an ignition system failure. If they are black check to make sure the choke is opening up and staying open. If the ceramic is light and not brown then the ignition system is failing. Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/darryl_24e8d8d43e609e3c

What ussually causes white smoke to come out the exhaust is oil being sucked up in carb. Typical causes are too much oil in crank case or PVC valve. Or really bad piston rings

rebuild or replace the carb- it isn't working properly. You may just need to clean it good as there may be a partial blockage.

I am having the same problem with my gxv 620. Did you ever figure out the problem?

It goes to the motor and grounds the ignition that gives it power. looks like yours has just came loose for some reason.

I have the same problem...did you find a solution? If so please email me at [email protected].

THANKS!!!!!

sorry first time doing this..... 2 larger Grays to engine coils ( should be grays) 1 Larger Black to Ground above starter 1 smaller white with blue stripe NOT USED 1 larger White to Batt+ 1 smaller black with Yellow stripe to Ignition + or like on my engine straight to Batt+ i am taking it off and putting on switch because it does have a slight amp draw. Good luck hope it helps someone out there

Carb. problem. rebuild or buy a new one

fuel pump not working or filter plugged

You have a jet thats stopped up probably from ethanol gas sitting in it

How many miles are on it? It could be worn out rings, valve guides and seals, cylinder could be worn out of specs, etc.. Either way, too much oil is entering the combustion chamber.

sticking valve cause that .

Bad coil or flywheel is very suspect probably leaning twords flywheel

Need to know what problem?

I am going to respond more than once here. What is this attached to? Usually when an engine just speeds up the causes are a lean fuel mixture or a vacuum leak. To search for a vacuum leak the easiest way is to use an UNLIT hand help propane torch that is barely turned on and listen for the engine to speed up when you pass the tip over the area of the leak.
Additionally the throttle shaft wears and allows the intorduction of air where the throttle shaft pivots in the body of the carb. Remove the air cleaner and reach into the throat and see if the throttle shaft and butterfly move in any direction other than rotation.

Since it seems to work fine under load and at speed I really think we are dealing with a vacuum leak or worn throttle shaft issue here.

I will be digging into the service manual and will provide a link if it is available for free. I will send that in my next response. I have another task to do today that may take several hours before I can respond. I am currently waiting for the customer to arrive. If the customer arrives I will be busy for a while but promise to repsond again. Just know if it is a while that I am doing other work at the moment.

Thanks for choosing FixYa,
Kelly

Change the spark plug. Check the plug socket and look for rust or grime.