jwales wrote:so I have not touched this since I last posted,got busy with things and it got buried in the shed. so I took it out today and fired it up again, thinking maybe some majic happened and it would be cured
of course not. still starts good n runs on lo idle/speed nicely. I took the blower tube off at the elbow so it is easier to work on the bench. while it was idling I grabbed the elbow and partially covered the opening and the engne sped up
thought it was a fluke so tried it several times. same thing, in fact I was able to play with the throttle and get it to run wide open.....briefly then it began to stall out until I pulled the throttle back.
I don't understand why it did that?? Why would restricting exit air on the blower make the engine run at higher rpm? Are there some clues here as to what is wrong?
I checked fuel lines, no leaks. pulled muffler. no real build up of carbon but soaking/cleaning anyway. cleaned carbon out of exhaust port. going to try another sparkplug even though current one seems to work fine a idle and lo speed.
Thanks for your ideas/thoughts!
Blocking off the blower tube removes the load on the engine. It is running too lean - have you tried that tune-up?
Make sure it has the *CORRECT* spark plug. - Echo can be real sensitive to the wrong plug - Had a customer a couple years ago with a GT200R - we did a tune up and maintenance and it ran good - this past spring they had it to another shop (closer to them) who replaced the NGK BPMR8Y with a Bosch plug (Equivalent to champion RCJ7Y) - and it only took 6 months before the machine was running like crap and using TWICE as much fuel as it should have... Simply replaced the spark plug with the CORRECT NGK BPMR8Y and his problems went away.. he had us do a complete tune up on it, and the machine runs good as new now... and a customer that is not planning on taking their equipment to anywhere else but our shop from now on.
Checked fuel lines how? did you pressure test them? replace the fuel filter? pressure test the carburetor?
and the carb only needs a special tool for the idle adjustment - the high speed is adjustable if you can get the limiter caps out and have a screwdriver small enough...
Also make sure your intake gaskets are not cracked or leaking, may also need to do a crankcase pressure test - (crank seals going out on these are not uncommon especially if they had been run overheating, or havent run in a long time and seals hardened up.)
-- Theres a lot that needs to be checked before condemning the carburetor. - almost always have been able to find something OTHER than the carburetor as being the problem.. as noted - it could be as simple as a plug change... and rarely have we had to ever adjust the carburetor - once they are set they tend to stay set... so if the machine was known to be running good and no one's tampered with the adjustments, I'd be looking at *every other* possibility before throwing a new carb in it... most of them are cheaper than a carb.
Also, before ordering a new carb (or any other parts for that matter) - It'll be a real good idea to make sure of your serial number and verify you are getting the right parts - there can be many differences in some of these models, and only way to know for sure is with the serial number.
How poor are they who have not patience. What wound did ever heal, but by degrees? - Iago (Othello Act II, Scene 3)