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LOSS OF POWER TROUBLESHOOTING: BOGGING DOWN [32,246 views]
 

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Loss Of Power Troubleshooting: Bogging Down
[32,246 views - 30 comments - Rating 4/5 ****- ]
Bogging down is usually caused by one (or more) of three things. Running rich, running lean, or a weak spark.

I'll start off with a very brief explanation of what Air/Fuel mixture is. The job of a carburettor is to atomize liquid fuel by injecting it into a flowing stream of air. The mixture of this air and fuel must be rather precise in order to combust within the cylinder. If there is much air, or too much fuel being delivered you will experience power loss and/or bogging down. With that said.. lets get down to the troubleshooting:

Most common cause: Running rich
Running rich (too much fuel in the air/fuel mix) could be caused by several things. The most common cause is a failing automatic choke unit. The choke on the GX150 carburettor is actually an enrichening circuit and in reality does not choke off any airflow at all. The auto-choke is ON in it's natural state. A failing auto-choke remains in the ON position at all times, thus it is characterized by the buggy running fine when cold, and hardly running at all when warm.

Running Lean
You may be running lean (too much air in the A/F mixture) if you are: 1. Having a hard time getting the engine started, 2. Once started the throttle is very tricky, too much throttle and the engine dies, and/or 3. Engine bogs and will not go beyond a certain RPM. This is commonly caused by a deteriorated intake inlet manifold. This inlet manifold can be found connecting the carburettor to the intake side of the engine. This little elbow-shaped inlet can form dry-rotting cracks, thus becoming a major vacuum leak. Please note: when replacing the intake inlet manifold, do NOT over tighten the nuts when securing it to the cylinder head.

Weak Spark
If the Air/Fuel mixture getting to your engine seems fine, then you may be looking at a weak spark. Ignition troubleshooting will be covered in detail on another page. The basic rundown is this: Stator/trigger wire -> CDI -> Ignition Coil -> Spark plug. It is best to check the resistance of the parts in question. Check the Yerf Dog GX150 Service Manual to find out the correct resistance values.
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30 comments about this article:
Poster #1 [04/16/10] Rating 4/5 ****-
I just rebuilt my front end, and go to test drive and i could not get the Yerf to go beyond XXX RPM the wheels would just start toput a load on the engine and then die... i finally jacked the rer end up started it and got the wheel to spin slowly but could not get them to go faster than just slow. I thought and think it might be the clutch, but better check the intake and fuel mixture, the plug was clean...
Poster #2 [06/19/10]
Have you tried checking the rear break cable to ensure that it's not too tight and putting the brake on the whole time?
Poster #3 [09/20/10]
so what do i do or adjust if its too lean or too rich?
Poster #4 [09/26/10]
cant get engine to stay running. it seems the timing is not right. how can i check it?
Poster #5 [10/10/10] Rating 3/5 ***--
i still have way more parts in my carb like the float and the big slide i see nothing about in here but it was still a little helpful
Poster #6 [11/03/10]
Uhm, I am not trying to be rude, but the only reason for Running Rich that you put was because of a failing Auto-Choke....but there are many different variables that are involved. One of the most important being figuring out the Main Jet size that you need in order to make it smoother and not run Rich or Lean. More info on Main jetting on 150cc Gy6 Stock Carb with UNI Air Filter and Performance Exhaust and Performance CDI and Performance Coil. There are alot of us GY6 150cc riders that have just a UNI Filter and Performance Exhaust, so if you could post some jet suggestions for that setup even, that would be great. Thanks for all the great work, keep it up!! Peace
Poster #7 [12/29/10]
I am Having Trouble with my yerf dog. I bought a new carb and installed it, and when i start it, it runs like crap when i move the throttle it it wants to go dead , any sugestions
Poster #8 [12/29/10]
The intake has little cracks all around it could that be the problem
Poster #9 [03/09/11]
hey guys how many fuel lins are there on a gy6 150cc buggy i took them off and cant rember what line goes where any help would be greatly aappreacated
Poster #10 [03/20/11]
what to check when engine lakes power will not pull hills at all. 150cc termator.
Poster #11 [03/20/11]
engine has little power. will not pull hills at all. 150cc termator.
Poster #12 [03/20/11]
engine has little power. will not pull hills at all. 150cc termator.
Poster #13 [03/24/11]
i have a gy6 150cc i can hit 50mph then it will bogg down to 40 and will run good at 40 i go higher for awhile then it does it again
Poster #14 [05/18/11]
i have a problem i haven't read yet. when i try to start my gy6,it cranks fine,has good spark.when choking it,gas pours out of the carb.no pop or sputter,just gas coming out,not going in. any suggestions?
Poster #15 [06/02/11]
mine goes up to like 15mph then boggs down and turns off i start it up again and then it goes up to 20/25mph and it repeats the process (its starts up fine it runs fine except that i am new to four strokes i usually have two strokes) please help me
Poster #16 [07/28/11]
So if i unplug the choke and it acts the same, boggy and misfires would that tell me it is a bad choke???
Poster #17 [12/12/11] Rating 4/5 ****-
Need answer to questions. Let us know if we are missing a link or something to access answers.
Poster #18 [01/29/12]
Suppose to be comments...about the article. Comments...a commentary...
ie
"Nice Article--thanks for the great info." :-0
Poster #19 [02/23/12]
im haveing a problem with my gy6 i need the stock ajustment setting for the fuel input, like 1 1.2 turns it was set at 2 1.2 turns how can i check the auto choke, i dont hear anything but its hard to hear when you turning the engine over, also can i bypass it? it idles and spudders untill you get up to speed once youve gotten up to 15-20 it starts running kind of smooth, idk any sugestons?
Poster #20 [03/03/12]
I have a dazon 150 and I have a queation when I accelerate it feels like its slipping or something and sometimes will come out of gear and ideas
Poster #21 [03/16/12]
Where does the vacuum line on the intake go to?Just bought a used Rover. It runs like crap, will idle and thats it.
Poster #22 [03/25/12]
The vacuum line should come off the "intake" tube after the carb it will then go to the fuel pump and possibly also t-off to some sort of emission control device
Poster #23 [04/07/12]
I have a problem, I have spark, 140psi, proper timing, new Carb to match the larger bore, I have fuel, and it still will not run. 180cc upgrade, 33mm Carb, new denso plug gapped to. 033 as suggested in the many forums I have read for this upgrade, new stator, new wire harness front and rear, new coil, new cdi, new regulator rectifier, new fan, new gaskets, no vaccum leaks, and it only has 3500 miles. Tank 150. Please get back to me, I am soon frustrated.
Poster #24 [04/07/12]
I have a problem, I have spark, 140psi, proper timing, new Carb to match the larger bore, I have fuel, and it still will not run. 180cc upgrade, 33mm Carb, new denso plug gapped to. 033 as suggested in the many forums I have read for this upgrade, new stator, new wire harness front and rear, new coil, new cdi, new regulator rectifier, new fan, new gaskets, no vaccum leaks, and it only has 3500 miles. Tank 150. Please get back to me, I am soon frustrated.
Poster #25 [11/14/12]
I have a GY6 150cc I took carb apart and cleaning it when I bought it. They people said it has been sitting in the barn for two years. The problems I'am having is when I open it up (full throttle)it takes off up until 10mph then it surges and goes no faster but stays that way also long as i keep it going but the weird thing is i can rev it up (not in gear) as much as i want and everything is fine. Then when I stop it when only idle for 10 seconds
Poster #26 [11/14/12]
I have a GY6 150cc I took carb apart and cleaning it when I bought it. They people said it has been sitting in the barn for two years. The problems I'am having is when I open it up (full throttle)it takes off up until 10mph then it surges and goes no faster but stays that way also long as i keep it going but the weird thing is i can rev it up (not in gear) as much as i want and everything is fine. Then when I stop it when only idle for 10 seconds
Poster #27 [01/03/13]
my 150cc starts with either but will not start on its own
Poster #28 [01/26/13]
what is the float heigth setting on GY6 carb.?
Poster #29 [09/13/13]
Had a similar problem on my Yerf Dog 3206, checked the choke, made sure I was getting enough fuel, then noticed the connectors going to the coil were corroded pretty bad. Cleaned up the connections and tightened up the connectors and it started to run like a champ again.
Poster #30 [11/08/13]
does anyone have the wiring diagram for my 03 dazon raider 150cc.its not the classic the wiring is diferent.if you do please send me diagram to nevarezcowboys@yahoo.com.thank you
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