I bought a well-used one of these last year. I actually was trying to take it completely apart to clean it (very dirty) but one of the long bolts on the bottom just spins the nut pressed into the plastic, so I gave up (any suggestions on breaking that free?). Happened upon this great write-up and decided to at least check out the carb.
Use it a few times camping with a couple problems. Shut off once with the low oil light on ... did not seem low, but added a bit and have since changed it and not had this happen again (may have just been too dirty?).
And it seems to surge/lope? when I turn the Eco on. I saw mention of this here a couple times, but no real explanation for cause and solution.
So pulled the carb apart today and was actually surprised by how clean the carb was considering how dirty the rest it. Air filter was still clean from a few months ago. I found the easiest way to get the emulsion tube out is to push it down from the venturi and then a couple taps into my hand. Looked clean, but sprayed it down with carb cleaner and air anyway.
First time I put it together found I had the bowl on backwards (how is it not marked?)
Second time I put it together and would not start ... realized I forgot to hook the fuel line back up ... oops.
Third time I put it together, started after 2-3 pulls.
Put it on Eco and still have the surging. I can see the black tab moving back and forth and I am not even sure it is making contact with the black throttle screw. With a screw driver I held the tab to the left and the idle came way down when I release it the rpm jumped WAY up. When I put the screw driver between the screw and tab the rpms were still surging a bit at the higher RPMs. When I turn the Eco off I think I can barely hear a little surging still.
Is the throttle electronic?
What is causing the surging? Would a leaking gasket (although they looked fine)? My float bowl o-ring was pretty flat (probably should replace it) ... could that be the problem?
I do not think I noticed a difference between the running before and after my cleaning ... so wondering if there is still something I am over looking.
I have taken apart a few ATV and MC carbs, but this electronic Eco thing is new to me.
Also, what is that tiny screw with the tab on it that you can only turn about 1/4 turn behind the black throttle(?) screw?
Thanks for any suggestions.
