Put a new air filter and throttle

Discussion in '4-Stroke Engines' started by Htown, Jan 14, 2011.

  1. Htown

    Htown Member

    I bought from SBP and engine now seems to be bogging down under load. It is about 56 degrees outside but always ran at this temp before. Will I need to get a pipe on the motor to get some back pressure now? Engine is a 49cc with a 4g belt.


  2. bogging down

    I too bought the sbp air filter My hs is bogging down too even with poo poo pipe
  3. Htown

    Htown Member

    I'm going to check if carb is sealing right tonight.
  4. Ghost0

    Ghost0 Guest

    I would suggest you check your plug for mixture. The filter is much less restrictive than the stock filter so it may cause the engine to run a bit on the lean side. May have to bump up a jet size.
  5. Htown

    Htown Member

    Thanks man, I ran it last night with the choke open to about 90%. Had just installed cateye computer and was getting top speed of about 27.5 mph. The stock filter seemed faster but I did not clock it prior to changing. I'll be lookng into re-jetting and perhaps a custom pipe.