Latest topics
Welcome to Gokart Bazaar
Hello guest, welcome to the forum. As a guest your access is limited , In order to see the help, how to sections, you need to register. Press this box to jump to the Registration Form. A valid email is needed for registration, in order to receive a verification code to enter the forum. I look forward to you registering



View previous topic View next topic Go down

Posts : 859
Join date : 2010-11-05
Location : Englishtown, New Jersey

PostBlackScorpion on Sat 13 Nov 2010, 9:05 pm


The feeling of "bogging down" when throttle is applied is usually caused by one (or more) of three things. Running rich, running lean, or a weak spark. Look below for an explanation.

Loss Of Power Troubleshooting: Bogging Down

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.

View previous topic View next topic Back to top

Create an account or log in to leave a reply

You need to be a member in order to leave a reply.

Create an account

Join our community by creating a new account. It's easy!

Create a new account

Log in

Already have an account? No problem, log in here.

Log in

Permissions in this forum:
You cannot reply to topics in this forum