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Ryobi 770rBE w/ Walbro WT526 carb no fuel flow


i6pwr's Avatar
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07-13-11, 08:19 PM   #1  
Ryobi 770rBE w/ Walbro WT526 carb no fuel flow

I bought this trimmer used, we fired it up and it ran but bogged on full throttle, I figured no problem...i'll just clean it up and adjust.

I removed the fuel lines and pulled the carb, I sprayed some carb cleaner in the jets and reassembled but this time no start.

The motor gets air and spark, with fuel put in carb throat it starts.

What I did was I pulled the covers from the carb..yes, I caught the spring , I pulled the jet and cleaned the seat and sprayed cleaner in the passages but I didn't remove the welsh plugs since I don't have a rebuild kit.

When I lift the needle it will flow fuel, however the metering lever doesn't seem to lift the needle enough and there doesn't appear to be sufficient travel in the arm to lift, could it be bent...if so how?

I can blow into the inlet and lightly press on the arm and get flow..but just barely, prob not enough for the motor to even run...not sure.

Can these arms be adjusted? Do these arms come in the rebuild kit.

The carb was fairly clean to begin with, I figured there was a small piece of something in the carb but would not even pop after I sprayed it, and this was before I pulled the carb apart.

What do you think?

 
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07-13-11, 08:44 PM   #2  
How flexible is the metering diaphragm? If it is too stiff, it won't flex enough to actuate the needle lever.


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07-13-11, 09:07 PM   #3  
Taking these carbs apart to clean without puting in the carb kit is kinda like washing your feet with your socks on,,, Sometimes it's O.K, but most times you have to go back & do it right,,,,,Roger

 
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07-14-11, 04:09 AM   #4  
Posted By: cheese How flexible is the metering diaphragm? If it is too stiff, it won't flex enough to actuate the needle lever.
Very flexible...almost like a piece of nylon but no leaks.

Posted By: hopkinsr2 Taking these carbs apart to clean without puting in the carb kit is kinda like washing your feet with your socks on,,, Sometimes it's O.K, but most times you have to go back & do it right,,,,,Roger
Yes I agree, what gets me is it ran and idled fine prior to my blast of carb cleaner in the fuel inlet, minus the high end bog....seems that's where I screwed up.

When I press the primer bulb it draws fuel through the carb but nothing into the cylinder. I can remove the plug, I can pull the starter cord and there is no fuel odor coming out and plug is dry.

Safe bet there is crud in one of the passages?

I will try to locate a kit locally. How much travel is the metering arm supposed to have?

 
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07-16-11, 12:11 PM   #5  
Carb #1 is rebuilt, no problems.

You all left out the part about when it's back together that it takes about 70 pulls staring at the sky screaming like a banshee.

Runs like a champ now thanks.

 
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07-16-11, 04:29 PM   #6  
Posted By: i6pwr Carb #1 is rebuilt, no problems.

You all left out the part about when it's back together that it takes about 70 pulls staring at the sky screaming like a banshee.

Runs like a champ now thanks.
Huh?? Am I missing something here?? Does it take 70 pulls to start?? Are you staring @ the sky & screaming???

 
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07-16-11, 08:16 PM   #7  
Posted By: hopkinsr2 Huh?? Am I missing something here?? Does it take 70 pulls to start?? Are you staring @ the sky & screaming???
Oh no....pops on 2nd pull cold, only 1 pull when warm......doesn't miss a beat.

I think there may have been an air pocket in the carb after the rebuild.....dunno but took a couple censored phrases before it started.

 
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