Subaru Carb Carp ?

Discussion in '4-Stroke Engines' started by robin bird, Nov 15, 2010.

  1. robin bird

    robin bird Member

    Anyone having problems keeping their Subaru carb carp free ? i cant find a small enough filter for the 1/8" line as the bulb filter in tank won't do it. My mechanic says the carb is complex like a watch (as i could see it was)He spent 4 times dismanteling it to blow out the debris--he said my friends Honda 100cc has a far simpler carb and can pass bigger debris--also the Morini 5.8 also will--anyone know if the Honda 50cc is more tolerant or the Tanaka pure fire ?or Daks 50cc ?

  2. hurricane

    hurricane Member

    I just simply do not take my bike any wheres near water, as we all know that is where the "carp" live:tt1:
  3. Old Bob

    Old Bob Member


    Yes, don't drive in rivers and lakes where there is a population of carp.
  4. RdKryton

    RdKryton Active Member

    I know some carbs are more intricate than others. That being said it might be time to tank the tank off and thoroughly clean it or even coat the inside. I will keep my eyes open for a 1/8 fuel line filter and will let you know if I find one.

    Here you go...
    Last edited: Nov 15, 2010
  5. robin bird

    robin bird Member

    Thanks Jim !
  6. Whizzerd

    Whizzerd Member

    Go to your local hobbyshop that sells r/c model aircraft. DuBro Products makes a nice aluminum filter which can de disassemled for cleaning. Price around 4 bucks. I dare say the carbs for the r/c gassers are very similsr if not exactly the same. Make sure you specify gasoline not methanol. 1/8th inch tubing used often in r/c.
  7. robin bird

    robin bird Member

    Hey excellant idea i will see them tomorrow !
  8. hurricane

    hurricane Member

    aww cmon, you guys had to get all serious on me and bob ,you have to admit his typo was funny.
  9. RdKryton

    RdKryton Active Member

    I say carp all the time because the word filter here will not let you say ****. Many other do to. Sorry...
  10. hurricane

    hurricane Member

    aww i see Rd, but this all you have to do to by pass that. just add a space

    Cr ap
  11. KilroyCD

    KilroyCD Active Member

    Carping about carp

    Maybe so, but carp has become a bit of a tradition here...
  12. Old Bob

    Old Bob Member

    Technicallly speaking, if you burn enough fuel you will get deposits in the carb no matter what you do.We see carbs with yellow crystal type build up in the pump chamber. What it is must be in solution or very fine particles because even filtering the fuel the deposits still appear.

    ok back to some light humor.

    <object width="480" height="385"><param name="movie" value=";hl=en_US"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src=";hl=en_US" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="480" height="385"></embed></object>
  13. hurricane

    hurricane Member

    aw carp, I understand now :)
  14. Silvaire

    Silvaire Member

    There really isn't much benefit in adding an inline fuel filter - assuming you have a tank with an original clunk type filter in it. The clunk filter alone should do the job (although I have had water in the fuel corrode the metal clunk which has then gunked up the carb too). There is also a small fine mesh filter inside the carb itself, but cleaning it requires a full disassembly of the carb.

    The big problem I've had with these small delicate carbs is rubber deterioration/hardening caused by alcohol in the fuel, with the general secondary issue of solids in the fuel precipitating out and gunking things up over time. I've had issues with varnish and solids forming over a long period of time with float carbs, but with the little carbs the rubber issues usually crop up first.

    The most consistent problem I have encountered with these small diaphragm carbs is with the flapper valve in the fuel pump section of the carb hardening and then curling up. Then it no longer pumps at full efficiency. The symptoms are cutting out at high throttle settings and an inability to hold an idle. I recommend that anyone running a 25 to 35 cc Honda or Subaru with a diaphragm carb keep a spare carb gasket or overhaul kit on hand for when they need it.
    Last edited: Nov 16, 2010
  15. augidog

    augidog Banned

    you keep bypassing the censor and you will find yourself in a world o' carp, my friend ;)

    hi Silvaire, ltns...nice post.

    interesting sig, Kilroy...
    Last edited: Nov 16, 2010
  16. hurricane

    hurricane Member

    Naw Augi, I have learned enough here and have copied all i need. Now it is out of pure boredom i visit anymore.

    i just dont like censorship basically is all,but each to there own
  17. augidog

    augidog Banned

    i was kiddin' on ya...MBc has always been about family friendly, hence tough rules on'll live ;)
  18. robin bird

    robin bird Member

    I ordered 2 inline 1/8" filters from Du Bro will see if that cures it also 2 better brass tank filters for the carp.
  19. PatrickW

    PatrickW Staff Member

    Ya know, I've been around a while, and carp in the carb was a new one on me. But, would you believe, when I cleaned the engine last time, I found two carp in my carb.

    To remedy this, situation, I went to the (don't laugh) fish store and bought several line filters from the guy in the fish tank section.
  20. robin bird

    robin bird Member

    Look at this picture of the carp in the fuel line ! No but seriously i just installed a new Dubro inline 1/8" filter and also they shipped a sintered brass filter for in the tank. The inline filter (aluminum) can be disassembled for cleaning and is very rugged compared to plastic.I got fed up having the carb cleaned- there must be a small particle of debris caught in the carb somewhere so i ordered a new one from Staton- they are on sale for $58 dollars-i feel it will save me futher grief ive got about 4000 miles on the engine.

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