I have an Echo CS530 that doesn't start. I have blue spark at the plug, plug is wet with fuel when trying to start, has compression, but will not hit with fresh gas, ether or brake cleaner. I have tried starting with ether & brake cleaner both with carb (WT-12) on and with carb off (straight into cylinder). Blew air through carb air hose. Strong stream of fuel from hose into carb when taking out carb. I pulled carb, cleaned, installed standard Walbro rebuild parts but cannot get a single hit. I tried a different spark plug verified spark. How do you test quality of spark/magneto? What am I missing?
Echo CS530 Will Not Hit, I'm Stumped
- Thread starter LohmanBoy
- Start date
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Possibly the flywheel has the key sheared, putting the spark out of time. Possibly a large air leak in the crankcase. Probably should check compression even if it feels like it has a lot.
Probably just seriously flooded, do a search on how to un-flood an engine
Check the compression on a good tester. Steve
Also may be losing spark under compression.....
Thx all, I will perform more testing based on your suggestions.
When you spray ether in the carb it washes all the oil off the bearings and rings. Probably ok once but I wouldn’t let my saw run on the stuff.
Agreed, I try to always use brake cleaner first and ether as last resort to try and get a hit. I ordered a compression tester and will keep eliminating possible causes.
Thx!
Thx!
If the plug always comes out wet, it could be badly flooded. Before wasting time and money, take the plug out and turn the saw upside down with the plug hole at the bottom and pull the engine over vigorously (ignition OFF) and see if it sprays fuel out of the hole. A saw with a lot of fuel in the crankcase will NOT run until you get rid of it.
If you spray ether in a flooded saw it will not light either.
Ether that you buy at a parts store has had lubricant in it like forever and it is diluted to the point it is not going to blow anything up. You can't even seat a tire with it anymore.
If you decide it is not flooded and has good compression check the flywheel key like Palmer said. They do shear for different reasons. Chain brake engaging at high RPM, yanking the pull rope and it gets to the top and has enough fuel in it to be hydro locked.
Had one the other day that had a rock in it of all things. Back pack blower not a saw, but you get the idea.
Ether that you buy at a parts store has had lubricant in it like forever and it is diluted to the point it is not going to blow anything up. You can't even seat a tire with it anymore.
If you decide it is not flooded and has good compression check the flywheel key like Palmer said. They do shear for different reasons. Chain brake engaging at high RPM, yanking the pull rope and it gets to the top and has enough fuel in it to be hydro locked.
Had one the other day that had a rock in it of all things. Back pack blower not a saw, but you get the idea.
A rough check for sheared FW key is to bring the piston to TDC and see where the FW magnets are relative to the coil. Should be rotated just past full alignment with the coil
