Echo won’t run on high speed

[bubbatime]

Originally Posted by artbuc
Don't see any reason to replace everything just because the bulb is cracked. Also, getting a new carb, plug, fuel line, etc for less than $15 tells me quality must be super low. Thx for the link but I would not trust this source.


Actually most small engines have made in China carbs now, and you can actually change the carb and all the small parts for often $10 to $15. Most folks don't realize this, and the replacement eBay carb is often times the exact same carb on your engine right now.

When working on small engine carb's nowadays, you ALWAYS price a new one. If its cheap, you slap a new one on it and be done with it. You don't rebuild or tinker with carburetors that cost less than $25 or $30 for sure. The rebuild kit for that carb is $10. Or you can get the fuel lines, filter, AND a brand new carb for $15. Which makes more sense?

I've put hundreds of these cheap made in China carburetors on customers engines and they are better than the OEM carb 7 times out of 10. They often improve on the design, and put out a better designed carburetor than what came on the engine to begin with.

 

[Cujet]

Recently purchased a $13 Amazon carb for my Echo 210. Runs perfectly and far easier starts too.

 

[artbuc]

Originally Posted by wag123
The high speed circuit in the carb is plugged, probably with varnish caused by old gas. Adding something (like Seafoam) to the gas won't help, the restriction will have to be manually/physically removed. The carb does not need to be replaced. I have gone into detail about how to do this in the past, so I won't go into it again.


Actually, the hi speed circuit is clear. The problem was a cracked primer bulb which would not allow vacuum to be pulled on the diaphragm to open the needle valve.

 

[das_peikko]

Originally Posted by artbuc
I do have an hi speed adjusting needle. It has no effect on the surging.


How could it not have an effect? That's what you should be asking yourself. I'd wager the carb has a major issue of some sort.

Originally Posted by artbuc
Actually, the hi speed circuit is clear. The problem was a cracked primer bulb which would not allow vacuum to be pulled on the diaphragm to open the needle valve.


That would be a major issue.

 

[artbuc]

Originally Posted by das_peikko
How could it not have an effect? That's what you should be asking yourself. I'd wager the carb has a major issue of some sort.


I said the high speed screw produced no effect on the the surging; I did not say it produced no effect on the engine performance. To answer your question, it did not affect surging because it was not causing the surging. You could still change engine performance by adjusting the high speed screw but it still surged badly. I had enough fuel to idle and accelerate but because I could not pull a vacuum on the metering diaphragm, the needle would not open and the engine bogged down. The reduced fuel consumption allowed the supply to catch up, the engine would accelerate, deplete fuel supply and bog down, etc, etc.