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Lacking power please help!

  • Thread starter Thread starter greg corpus
  • Start date Start date
G

greg corpus

Guest
Hello, I am new here and to motorcycles and need some help. To start off my bike is a 1979 425 . The problem with the bike is it is lacking power. This has happened two other times before. while riding it will make this popping noise and the take off and regain power. hoping you guys can tell me what is causing this and how to fix it thank you in advanced.
 
Sounds like one of the cylinders is dropping out.

What maintenance have you performed?
 
Bad plug wire connections, bad wire arching from time to time to the engine block, bad connections at the wiring harness for the coil leads, bad wiring harness grounding point, bad plug caps, plug itself going south, slight petcock blockage.... just for a few i can think of right now.
 
Get 5 bottles of 90% rubbing alcohol..rinse the tank like mad with 3 of the bottles and then again with the other 2. It will cut any gelled slime off the walls of the tank. By like mad, I mean agitate it at all angles for at least 15 minutes with the "cutting" application and 5 for the "rinse".

Next, if it has an inline fuel filter..look and see if its all brown and nasty looking..possibly clogged.

Replace the fuel lines with new..yes rubber deteriorates and specks can get sucked into the jets.

Set the valve adjustments per the manuals specs.
 
New air filter will let her breathe better too. Pull the petcock and check the screen there too.
 
Hi Greg and welcome!

The other is to check the state of the spark plug caps. They can be dodgy and cause weak spark.

Being a 425 means you have points as well, so check the state of the points, they made need adjusting, filing, or replacing.

The other thing I have heard of is the condensors on the coils failing, so there's another possibility as well.
 
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