 chmodPremium
join:2000-12-12
Lockport, IL | reply to TA63
Re: Help troubleshoot snowblower carb problems. said by TA63:There is a problem with either the float, its needle or seat. I agree that a shutoff is a great idea, but the current problem still needs to be fixed. The float appears fine, it has no leaks, nor varnish. What do I look for on the needle? Theres a spring I guess you would call it and I assume is the seat on the bottom side.
--
Some people are like Slinkies. Not really good for anything, but they still bring a smile to your face when you push them down a flight of stairs. |
|
Stevert
join:2001-10-23
Algonquin, IL | said by chmod:The float appears fine, it has no leaks, nor varnish. What do I look for on the needle? Theres a spring I guess you would call it and I assume is the seat on the bottom side. The float could be fine, but if the needle isn't sealing it won't shut off the flow of gas into the carb.
And no, the seat is actually above the pointed top of the needle. When the bowl fills with fuel and causes the float to push the needle up, that's where it seats. Look for damage/contaminants there and on the needle point itself.
Here's a link to a picture of a carb assembly that shows the seat - It's a downdraft carb, and yours is a side draft, but the float/needle/seat work the same in both:
»racingarticles.com/images/carb_basics.gif |
|
 TA63ST215WPremium,MVM
join:2000-11-23
there
kudos:2 | reply to chmod
There is sometimes a specification for the weight of the float.
Aside from that, make sure that nothing is sticking and that the sealing surfaces of the needle and seat are good.
Clearly something isn't good!
Sometimes you can buy rebuild kits, these may include a float/needle/seat.
If it is dirty, then make sure to address the source of the dirt as well, or the problem will recur.
--
Striving for Parfection. |
|
 Tursiops_GTechnoidPremium,MVM
join:2002-02-06
Norwalk, CT | reply to chmod
Just adding to TA63  's post, Is there any Rust in the Fuel tank? If So, then you should either replace the tank, or else add an In-line Fuel Filter to prevent the rust from re-contaminating the carb...
-Tursiops_G.
--
If You're Unsure, "RTFM"... If You're SURE, "RTFM" Anyway.  |
|
chmodPremium
join:2000-12-12
Lockport, IL | said by Tursiops_G:Just adding to TA63 's post, Is there any Rust in the Fuel tank? If So, then you should either replace the tank, or else add an In-line Fuel Filter to prevent the rust from re-contaminating the carb... -Tursiops_G. The tank is very clean.
--
Some people are like Slinkies. Not really good for anything, but they still bring a smile to your face when you push them down a flight of stairs. |
|
|
|
 DaHenPremium
join:2002-11-08
Brockton, MA | I vote for a rebuilt kit as well. The new gaskets and needle would help.
Plus a fuel filter and valve. |
|
 Doctor OldsI Need A Remedy For What's Ailing Me.Premium,VIP
join:2001-04-19
1970 442 W30
kudos:18 | reply to chmod
I'd say the float is too heavy. If it is made from brass then it has likely leaked at the seams and it would have gas inside it, or if it is solid material then the body has absorbed gas making it heavy.
There is a float scale made that is used to determine it's weight.
Tomco Carburetor Float Weight Scale #13700 13.95 + 5.00 shipping
»cgi.ebay.com/ebaymotors/Tomco-Ca···40154759
You can also try local parts stores to get one. You would need to know the correct weight of your float also.
»www.trialspartsusa.com/diagrams/···2000.doc
quote:
The reasons for a float going bad are varied, but I will mention a few of the common problems. Trials machines often sit for long periods and gasoline will eventually permeate the float making it unable to lift the gas needle valve. Some fuels appear to cause premature failure of the float materials. I suspect that the grain alcohol found in some gasoline brands is a common culprit. If a machine is going to be stored for a long period, it is best to drain the fuel from the tank as well as the float bowl. Note: Simply allowing a float to dry may return it to it’s proper weight, however the float remains permeable and must be replaced. If a float (or floats) is bad, the richer mixture coming into the engine will cause poor running. The operator may mistake this problem as being caused by the gas jets. The operator or his/her mechanic may change the gas jets to ones that are “leaner” to compensate for the rich condition. This is not a good solution as the correction only applies to the engine when it is running at low revolutions. As revolutions rise, the carburetor requires more fuel and the engine will quickly use all of the excess gasoline that is in the float bowl.
»www.cheapsnowblowerparts.com/pro···C76.html
quote:
AMF primarily produced lawn equipment under the name Dynamark. This trade name now comes under the Murray corporate banner.
Normally you do not store a gravity fed engine with gas in it, but you run it dry instead before storing it. Alternatively, you can install a fuel shutoff at the tank base.
Regards,
Doctor Olds
--
What’s the point of owning a supercar if you can’t scare yourself stupid from time to time? |
|
 SplitpairPremium
join:2000-07-29
Cow Towne
kudos:3
1 edit | reply to chmod
said by chmod:The float appears fine, it has no leaks, nor varnish. Is it brass? If so shake it if it's empty it's good if it's composite don't worry about it
What do I look for on the needle? Theres a spring I guess you would call it and I assume is the seat on the bottom side.
Carefully examine it at the tip for any scoring varnish or discoloration.
The seat is the part the needle sets into you may be able to use a bright light and mirror to examine it without removing it from the engine again your looking for any damage or varnish.
If you find discoloration or varnish on either the needle or the seat try removing it with some lacquer thinner and or acetone.
If the needle is damaged it will need to be replaced if the seat is damaged in most cases such as with the Walbro or Nikki carbs the body will need to be replaced as the seat is not removable.
As for parts these folks have great pricing and ship quickly. »www.ordertree.com/
Wayne
--
If you cannot fix it with a buttset and some beanies you ain't a technician.
|
|
SplitpairPremium
join:2000-07-29
Cow Towne
kudos:3 | reply to Doctor Olds
said by Doctor Olds:You can also try local parts stores to get one. You would need to know the correct weight of your float also.Regards, Doctor Olds Therein lies the problem I have a couple dozen small engine manuals covering most every air cooled engine used in this country since the 70's and in none of them is the weight of the float specified.
FWIW I have rebuilt maybe 100-150 small engine carbs and have never come across found a defective float.
Wayne
--
If you cannot fix it with a buttset and some beanies you ain't a technician.
|
|
 PiggieI Actually use WindstreamPremium
join:2005-11-23
Orange Springs, FL | Wayne, I have rebuilt a few dozen carb and have seen one bad float. Normally it's the needle valve.
My general advise is any small engine should have a fuel filter and if gravity feed a cutoff. I add them to any engine I have. I recently bought a Briggs generator. It had a shut off, but not a filter.
I also shut down the engine with the shut off valve if it will be put away for more than a few days. I am sure this cause some lean burning toward the end, but I ride the choke, increasing it to minimize this effect. I don't think this tiny bit of lean running hurts anything and it empties the bowl. I have Briggs engines around here that have run 10 years between carb cleaning or rebuilds doing this.
Another problem I am seeing, a lot of the newer plastic ventless red plastic gas tanks for storing fuel, don't have even a primitive filter in their spouts. They also don't seal very well, as I have found dirt and water in them from being stored outside, that wasn't their before. Sadly I can't find the old style 5 gallon cans I used to buy.
--
| Speedstream 4200 Modem - 3m/384 plan | W98-W2KSP4-XPSP2 - All AMD | Buffalo WHR G54S with Tomato 1.18 | 3 downstream switches feeding 6 total clients (no wireless) | Including the Data port on the side of my neck | |
|
Doctor OldsI Need A Remedy For What's Ailing Me.Premium,VIP
join:2001-04-19
1970 442 W30
kudos:18 | reply to Splitpair
said by Splitpair:FWIW I have rebuilt maybe 100-150 small engine carbs and have never come across found a defective float. From a Sears riding lawn mower.
--
What’s the point of owning a supercar if you can’t scare yourself stupid from time to time? |
|
SplitpairPremium
join:2000-07-29
Cow Towne
kudos:3 | No need to put that one on the scale it's fubared that poor float looks like it has been thru World Wars 1 2 and 3 heck it makes my ex look good.
Wayne
--
If you cannot fix it with a buttset and some beanies you ain't a technician.
|
|
SplitpairPremium
join:2000-07-29
Cow Towne
kudos:3 | reply to chmod
The tank may be clean but gasoline is not as such a two dollar inline filter is money well spent and if mounted sideways will trap water.
Wayne
--
If you cannot fix it with a buttset and some beanies you ain't a technician.
|
|
