Carburators

trucmech · Jun 25, 2012

Hi all, I am an avid reader of this site. Just had to add this time. i know many times i have read where some
one has a tractor that dies when throttled up or needs choke. I recently worked on a 41 H sat for a while and now would not run. took the carb off and "cleaned" it. better but still no idle with out choke but it ran. Long story short, make sure you find ALL the ports to clean after the 4 th time i found the power jet was green goo. Now she runs great! Just carb cleaner and air was not enough with out visually seeing each item cleaned.

Earl-IL · Jun 25, 2012

Carburetor rebuilding can be made a lot simpler if you can understand there are 2 main circuits in a carb. High Speed & Idle circuit. After that is the other circuits that make the carb perform near to perfect. Try & find a manual that lays out these circuits for you.The IHC carbs have a lot of drive in plugs for the economizer circuits.Sometimes you can spray brake clean through the circuits & they appear to be open. But when you pull the plugs and run the correct NUMBER bit through you know they are right. I have to remove those when I rebush the carb on the throttle shaft.The holes in the bushing need to be the correct size. Just remember drill bits don't go around corners.

Dick L · Jun 25, 2012

YUP! You gots that right.

But,but but that takes a lot of time and I wanted to use it today.

^D

But but but I never done this before and what if I break something and I have to buy a new carb?

^D

But but but I had a buddy that just sprayed some carb cleaner in his and it worked fine so why would I need to do all of that?

^D

A bunch more reasons could be added as to why should I.

Dick L · Jun 25, 2012

And the drill bits didn't go around corners when the carburetors were made.

Mike (WA) · Jun 25, 2012

Allow me a second for my soap box-

FIRST thing to do when you have to adjust the choke when you adjust the throttle, is check for fuel flow from the tank. Take off the sediment bulb, and see if you get a full flow (not just dribbling).

I try to make the carb the last resort- because I usually screw it up.

Billy NY · Jun 25, 2012

I would definitely agree on that, have done it myself. Last one was a small generator, honda, used to do a fair amount of small engine work, so people bring em to me still. Typically, I find a lot of carbs that need cleaning or a rebuild kit. Somehow on this one, I just did not get the main jet cleaned out, sent it out running fine, but it came back, took it apart, and I use torch tip cleaning bits of the correct size, went in there again and was like, "how did I miss that?" happens I guess.

Bob Bancroft · Jun 25, 2012

You've got an excellent discussion going here. Many good points raised.
When I worked at an AC dealer from 72-84 I did a lot of the carb. work. A few simple tools did the job.- letter/number drills, squirt can, doctors light, pressure tester(to make SURE the needle and seat really held!)
I can't tell you how many times I worked on a carb.- didn't really see anything- but apparently I knocked something loose!
I also got so I carried a 3/8" pipe plug in my tool box because I so often had to take a sediment bowl assembly out of a tank that of course had gas in it! Unscrew bowl, get soaked, install plug, clean neck, unscrew plug, get soaked, re-install bowl. That was fun on a cold day! Maybe that's why I don't like messing with gas at all anymore.

Lloyd In South Carolina · Jun 25, 2012

I do a lot of motorcycle carbs,,,,, and of course everything is small. My secret weapon is a blow gun I bought at harbor freight,,, it has a tiny steel tube that can attach on the end, has maybe a 1/8' diameter hole through it. I stick it in any hole in the carb after soaking, 160 PSI does the rest.

I think I know this is now illegal, OSHA says it could take you eye out! But it does the job.

L.

Anonymous-0 · Jun 25, 2012

Had a Mikuni carb that would not run right. Same thing, cleaned it and no change. Cleaned it again and noticed a speck in the bore so I took a wire out a wire brush and bent a right angle on the end. Put the wire on the speck in the bore and pushed and it sunk in and green goo oozed out. Now I look at every speck to make sure it isn't a metering port.

Earl-IL · Jun 25, 2012

Ultrasonic cleaning works the best for the smaller carbs. I don't own one yet,but it is on my wish list. Our local John Deere dealer has one they use in their Lawn & Garden dept. They claim it has solved all their carb cleaning problems. I need to find out what liquid cleaner they use.

Carburators

trucmech

Member

Earl-IL

Well-known Member

Dick L

Well-known Member

Dick L

Well-known Member

Mike (WA)

Well-known Member

Billy NY

Well-known Member

Bob Bancroft

Well-known Member

Lloyd In South Carolina

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Anonymous-0

Well-known Member

Earl-IL

Well-known Member

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