Search results

What he did is increase the idle speed enough to where it no longer runs off the idle circuit. It now runs off the main jet.

I watched the extended length video. That little Yamaha generator and my Honda mower are doing the exact same thing. Both run perfectly fine while under load and then go into a lean misfire off load during idle. The generator's load is a toaster, the mower's load is the blade clutch being...

Ah Ha! I suspected it being an adjustable air bleed all along! The key to eliminating the surge might be that fixed pilot orifice under the Phillips screw. :)

#7 might be a screw covering the pilot jet like on my Honda carburetor. If you look back at the picture, the limiter cap is partially blocking the view of a Phillips screw which is a cover for a 0.35mm hole. I call it a pilot jet but I really don't know what it is. It's definitely a hole with a...

Holy smokes, that thing has a throttle motor assembly: https://www.yamahapartshouse.com/oemparts/a/yam/5c4f5ba887a86609d0b4de24/carburetor

If you have a gmail account, I can send you a service manual. That's a single cylinder overhead valve; correct?

Does it have the automatic choke with the thermal wax? When the wax heats up, it pushes a rod going to the choke butterfly. When the choke butterfly is closed, the engine get a limited amount of air making it run nice and rich. When the choke butterfly opens up all the way, that's when the...

It helps a little bit. The surge is never completely gone. The governor rod going to the throttle butterfly will move about once every 10 seconds at idle. When the engine is at idle under no load, the governor rod should never move. Ever.

What I had to do with my Honda HRN216 mower is cut the limiter cap so that it doesn't hit the limit stops anymore. They give you an adjustment range of 11:00 O'Clock to 1:00 O'Clock between the stops. The engine needs 9:00 O'Clock to idle without surging. You can see what I did by the red cut...

That sound is typical of an idle circuit running too lean.

It works very well in my equipment. I have no reason whatsoever to change to a different oil. There's a good chance that their oil is far superior to FB but they don't want to pay the outrageous certification fees.

Bingo!

I guess I should've read your post 10 minutes ago before I ordered another 6-pack from Ebay. 😁

40:1 mix ratio is too much. I've been using STIHL ULTRA full synthetic for several years now. It burns real clean and keeps the engine running very clean. I run it 50:1 and measure it exactly my arranging the service station pump to shut off at exactly 2.501 gallons. If the price of premium...

Is there a limiter cap on the idle mixture needle like this?