Question about Troy Bilt Tb425cs 26cc 4 - Cycle Curved - Shaft Gas Trimmer with Ez - Start and Speed Spool

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What is Part No. for primer bulb used with zama carb zamacarb on TB425CS?

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Posted on Jan 02, 2017

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SOURCE: primer bulb on weedeater won't prime

when you prime the bulb it sucks gas from the tank with the small tube, any excess gassed pumped will be fed back to the carb via the big tube leading to the tank. If you prime it and the bulb stays pushed down, then you have a clog or kink. To fix , pull the small tube out of the tank through the fill hole. Pull off the filter on the end and put the tube back in the tank. If it primes, your fuel filter was clogged. If it still wont prime check the hose going to the carb and make sure isnt clogged or kinked.(take of carb and blow in it). If that doesnt fix it take off the bulb from the carb with two screws. The bulb assembly will come off too(rectange metal thing) Take off the two black gaskets, be carefull with them. Take off hoses from carb and bulb asembly. Blow carb cleaner in all holes and over surface. Put back together.
If the carb wont prime and the bulb isnt staying depressed. then you might have a bad bulb or carb gaskets. Make sure hoses are not cracked, cloged, or pinched.

Posted on May 29, 2012

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1 Answer

The primer outlet valve on zama carb is leaking. How can I fix this?


I don't know what make or model the piece of equipment is that you're referring to, but if the primer bulb sits on the top of the carb then there is a plastic base that can be replaced. If its a primer that has pipes connecting to the cack of it then you will need to replace the primer bulb entirely

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Diagrams of zama carb c1u


http://www.zamacarb.com/pdfs/TechGuide_2007.pdf

click the link anf find the user guide and instructions

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I have an antique stihl weedeater that will not stay running I've cleaned the carb.,the carb sceens and replaced the primer bulb I'm not 100% sure about the scew settings.


You probably know that it may need a rebuild kit with the new gaskets and diaphragms in it. It is quite possible a kit exists for it even though it is antique. Is it a Walbro or a Zama? I will send you to a tutorial by Zama on tuning a 2 stroke carb which includes your mixture screw settings. If you need help finding a rebuild kit or just a gasket w/diaphragms kit, please post back. I will be glad to assist.

http://www.zamacarb.com/tipspage.html

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2 Answers

My Homelite Mighty Lite 26b Leaf blower has a punctured primer bulb. Homelite doesn't list the part number. Model number UT08520A Can you help? Thanks, Ed Mckinney,Tx


Homelite wants to sell you a new carburetor assembly. Your blower came equipped with a RuiXing brand carb. RuiXing does not offer any repair parts for their carbs, only replacement units.
Now for the good news....a Zama brand primer bulb fits perfectly on the RuiXing carbs. Check with your local small engine repair shop for a Zama primer bulb. The blower requires removal af the carb to get at both of the screws that hold on the bulb. It is not difficult, just one nut holds on the outer airbox cover...don't lose the little washers. Then one long stud and one short screw will take the carb off. Replace the primer bulb and reinstall everything the same way it came off.
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1 Answer

ECHO BPH755 WON'T GO FULL THROTTLE UNLESS CHOKED


If you have one of the rotary-type, non- adjustable carbs, you may have to install a diaghram kit or rebuild kit as the fuel pump diaghram may need replacing.....otherwise....you may only need to "tweak" the H-speed adjustment screw on this carb. If so, here is how Zama says to do it:
http://www.zamacarb.com/tipspage.html
The tool used to adjust these carbs can be found on Ebay and is less than $10 if you don't rig one by your own methods.
Here is an application list from Zama so you may know what diaghram and/or rebuild kit to install.
http://www.zamacarb.com/pdfs/APPL_CR2010.pdf
Here is a cross reference to the carb's kits:
http://www.zamacarb.com/pdfs/QuickKit_CR2010.pdf
RB is complete rebuild kit and GND is gasket and diaghram kit.

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1 Answer

My weedeater lawn edger wont start. I get no gas in the primer bulb, but has fuel in both the main line and the return line. I blew out the fuel fliter and both lines but still no fuel in the primer...


There may be a malfunction in the check valves in the primer base assembly. Before attempting to get a new assembly, take the retaining screws at the bulb off, remove the bulb and spray the assembly liberally with WD-40 or an equivalent light lubricant. Sometimes this will free the check valves as they only let fuel flow one way and there are 2 of them in the primer base.
Do not use strong solvents, do not ever soak, and never use high PSI compressed air on these carbs. Sometimes, when the check valves in the primer base go bad, the carb floods and the reason is unclear. Zama doesn't list this as a reason for their carbs flooding, but they can. You may wish to view a parts breakdown list for your specific carb. You will need to know the type (stamped in side of carb body) and the model (stenciled in side of carb body). It will be something like a C1U type and a W-18A mode...thus its a C1U-W18A Zama carb. Here is a link to get you started.
http://www.zamacarb.com/pdfs/APPL_CR2010.pdf
Yours will be listed under Poulan/Weedeater

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1 Answer

Need to know the fuel line routing including the primer bulb.


The smaller diameter line (fuel supply) goes from the fuel tank (w/filter) to the carb body. Look carefully at the 2 nipples on the carb. You can tell one is slightly larger than the other. Another larger line (purge line) goes from carb body to the right nipple on the primer bulb. Another large line (return line) goes from the left nipple of the primer bulb into the fuel tank. completing the purge circuit. This info pertains to the Craftsman 32cc with Zama carb and may work on the 25cc model as well.

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1 Answer

I am looking for Ryobi brush cutter parts


Any local small engine service shop should have these parts in stock. Its called a 'primer bulb'.
Determine if the primer bulb is part of the carb or sperate from the carb with fuel lines connecting them. If seperate remember how the 2 lines get connected when you remove the bulb and replace with a new one. If a part of the carb...
You need to determine if the carb is a Zama or Walbro. It will have the name stamped on the carb. All Zama carbs use the same bulb. Walbro has a small and large bulb.
It would be worth while to install a new carb kit while you have the carb off and apart

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1 Answer

PRIMER GAS BUBBLE CRACKED & LEAKING


Carefully unsrew the two screws in the plate holding the primer bulb down and just remove it while holding the rest of the carb down. Take the bulb to a parts/repair shop and buy another bulb for a Zama carb and reinstall.

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