How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Rick Your Own Question

Rick
Rick, Small Engine Technician
Category: Small Engine
Satisfied Customers: 3844
Experience:  Outdoor Power Equipment technical trainer since 1990, covering eight states.
20444326
Type Your Small Engine Question Here...
Rick is online now

Hi,my son has a Champion 450,148cc.,serial no.1012075111496,(also

Customer Question

Hi,my son has a Champion 450,148cc.,serial no.1012075111496,(also has CR84 printed on somewhere) & the question is:- It was very poor starting this season & then was running terrible,he asked me to have a look at it (by the way it looks brand new it is 3 years old & has hardly done any work).When I had a go at it,it wouldnt start a all & we found that a new plug was the answer,it started first go but was still running even when warmed up as tho it was on half choke.I left it running for quite a while so it was thoroughly warmed up & then had a look at the new plug,it was all black again as tho the mixture was too rich,I was hoping to see a mixture screw to adjust it but couldnt see one,am I right in thinking it hasnt got one.If we continue to use it like this obviously it will eventually carbon the plug up & we will have to replace it again.We could live with it like that but would like your advice on how to cure the problem & have it running as sweet as a nut.Over to you.Thankyou.
Submitted: 2 years ago.
Category: Small Engine
Expert:  Curtis B. replied 2 years ago.
Check the carburetor choke flap. It sounds like the choke is closed and not opening as it should, flooding the engine and causing the carbon buildup on the spark plug.
Customer: replied 2 years ago.

Hi,how do I get at the choke on this particular engine,it looks like it is pretty sealed unless I remove the carburetor,is this the case?

Expert:  Curtis B. replied 2 years ago.
I don't have a picture of the carburetor, and the model you provided does not show,usually the choke could bee seen if the air filter and adapter is removed, but I don't know this application.
Customer: replied 2 years ago.

Hi again,when you take the air filter off on this model all you can see is the vertical inlet chamber with a jet at the bottom,and the choke flap is nowhere to be seen,have you access to an exploded view of the carb.in order to ascertain the position of it,could it be on the other side of float chamber,i.e.on the engine side of the carburetor? Also there do not seem to be any moving parts on the carburetor only the throttle mechanism on the engine side of it,is there any adjustment anywhere that could affect the even running.

Expert:  Curtis B. replied 2 years ago.
it has no choke , the flooding may be due to a leaking needle valve or a bad float in carburetor. If you can get me a model number that will show, I could see. What is this, I assume a go cart or other small atv.
Customer: replied 2 years ago.

Its a Champion 450, & is 148cc.& the serial no.is 1012075111496,& it also has CR84 printed somewhere on the body,I dont know if this is sufficient information for you.

Expert:  Curtis B. replied 2 years ago.
A Google search for Champion 450 does not show anything, What is this application?
Customer: replied 2 years ago.

What do you mean with 'what is this application'?

Expert:  Curtis B. replied 2 years ago.
Generator, lawn mower, go cart, airplane, car, chainsaw, trimmer?
Customer: replied 2 years ago.

lawn mower!

Expert:  Curtis B. replied 2 years ago.

Is this Briggs engine? With carburetor mounted on the fuel tank? Here is link to what I think you may have.----http://outdoorpowerinfo.com/repairs/briggs_vacu-jet_vert_auto_all-temp.asp

What Customers are Saying:

 
 
 
  • You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future. Jimmy
< Previous | Next >
  • You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future. Jimmy
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C.
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C.
 
 
 

Meet The Experts:

 
 
 
  • Jon K.

    Jon K.

    Small engine diagnostic expert

    Satisfied Customers:

    2823
    Gold certified Stihl tech, Service Manager for a rental/repair shop.Certified in most small engines
< Last | Next >
  • http://ww2.justanswer.com/uploads/jonrk/2010-1-5_22551_jon.jpg Jon K.'s Avatar

    Jon K.

    Small engine diagnostic expert

    Satisfied Customers:

    2823
    Gold certified Stihl tech, Service Manager for a rental/repair shop.Certified in most small engines
  • http://ww2.justanswer.com/uploads/KO/koboma/2012-6-6_20917_DSCF1022.64x64.JPG Curtis B.'s Avatar

    Curtis B.

    Technician

    Satisfied Customers:

    162
    Service manager and technician for all brands of engines with 40 + years of experience.
  • http://ww2.justanswer.com/uploads/HA/HankF/2013-8-27_12514_JAProfilepic.64x64.JPG Hank F.'s Avatar

    Hank F.

    Technician

    Satisfied Customers:

    5359
    Certified on Onan and Generac generators.
  • http://ww2.justanswer.com/uploads/RA/ranwell1/2013-5-23_17421_2fixed3.5x5.64x64.jpg ranwell1's Avatar

    ranwell1

    Small Engine Technician

    Satisfied Customers:

    5039
    Owner of Large Small engine repair business. Over 39 years. Certified both 2-cycle and 4-cycle engines
  • http://ww2.justanswer.com/uploads/SP/spankyjr1/2014-1-16_16395_Leha002.64x64.jpg spankyjr1's Avatar

    spankyjr1

    Small Engine Technician

    Satisfied Customers:

    19
    Journeyman TechnicianWorked on small to large engines for 30 yearsGas,LP,Diesel
  • http://ww2.justanswer.com/uploads/PL/Plumberpro/2014-6-23_6520_image.64x64.jpg Plumberpro's Avatar

    Plumberpro

    Plumber

    Satisfied Customers:

    40
    Fully qualified plumbing , heating and gas engineer 20 years experience
 
 
 

Related Small Engine Questions