Ryobi 4stroke brush cutter, fading on full throttle

model number would help but since I am assuming it\'s a hand held weed chopper I am going to say it\'s probably rusted

should of had the carb adjusted first

Yes, there are several types like this

http://www.supersealer.net.au/welcome/page3.php

http://www.ebay.com.au/itm/Whipper-Snipper-Trimmer-Brush-Cutter-Alloy-Head-Brilliant-Results-and-no-Fuss-/270855243266?pt=LH_DefaultDomain_15&hash=item3f103b0602

Here is the Zama carburetor tech guide. Pay close attention to the diagrams, it does show exactly what gaskets go where.
http://www.zamacarb.com/pdfs/TechGuide_2007.pdf
You will need Adobe Reader installed on your computer to view this as it is a PDF file. If you don't have it, you can get a free download for the program at the Adobe website. It is a safe site.

I just found out that the string head adaptor (arbor?) has left-handed threads...so try loosening it the other way. Here it is:

http://www.ereplacementparts.com/ryobi-bc30-ry30004-brushcutter-parts-c-7931_15654_15655.html

Hi Doug,

There are adapters for just about every combination of trimmer, brush cutter blade, grass gator, etc. you can think of.

One of the most handy purchases has been a non specific arbor adapter set. Not only does it have 2or 3 each of the most common nuts in both left and right hand thread, it has inserts that keep every blade, flail and brushcutter I've tried dead center.

It even came with a diamond shaped one for a skillsaw blade that I tried with my Ryobi 4 cycle. That thing turns thorny blackberry vines to powder.

So the answer is yes.

Best regards
Mike

Smokey 2 cycle oil will cause the exhaust ports to carbon up and plug the spark arrestor.
Remove the muffler, use a pick to clean out the exhaust port on the engine, and the muffler inside opening, then clean the spark arrestor screen, to assure yourself you are correcting the problem start the machine up with the muffler off, it should run like a charm, if it goes back to running badly when you reattach the muffler it may be clogged on the inside.


I’m happy to assist further over the phone at https://www.6ya.com/expert/gregg_78ecbb34e27be215

My Ryobi 890r brush cutter will start and then die

Fuel filter to bottom of carb. The suction port of primer to the top of carb outlet line to other port to tank.
To tell which port is outlet put your finger on one port and push bulb if the bulb collapses and doesn't return then that is the inlet (suction) side.

PS. I would buy some carb cleaner and gently spray in the inlets of the carbs (sometimes pieces of the fuel lines get in there).
Good luck!

Have you tried adjusting the carb settings?