Ryobi 2 stroke brush cutter problem

[CageyH]

I have an old Ryobi RBC40 SB, and it has started to bog down at high revs when hot when giving it the throttle.
Does anybody have experience with these, and if so, is it likely to be just a carb adjustment, or something more involved?

[Firebottle]

Have you given it any sort of overhaul/deep clean Kevin?

[scotty38]

Could be carb/main jet blocked a bit/sticking but worth checking the plug and lead too.

[Yatsushiro]

When it bogs, is it like running out of fuel, or like the choke is still on (4 stroking)?

First things first:

1. Clean, or new, spark plug.
2. Check, clean air filter.
3. Check, clean fuel filter/pickup
4. Check exhaust for blockage

[Puffin]

I have a McCulloch petrol strimmer that was doing something like this. I took the carb apart and inspected the diaphragm and it was split. I got a service kit from a local chainsaw seller/service place and cleaned all the carb out and replaced the diaphragm. That was about 3-4 years ago and it is still ok.

[Audio Al]

My Honda GX31 was doing that , now it won't rev at all , Carb fubared , Took it apart and its all gummed up , crisp diagrams

New carb ordered £13 of the bay of EEEE

[CageyH]

Thanks for the feedback.

I serviced it at the end of last season, and drained the fuel out.
Today, I stripped it down and blew out all of the jets, cleaned up the mating surfaces and rebuilt it with some blue hylomar on the mating faces.

The only thing I did not check was the fuel filter. I removed that earlier, and there is a small split where the pipe connects.
It has to be this, as when there is a full tank, it runs fine. As soon as the level drops, it plays up. I will try and bodge it up until a new filter arrives.

[walpurgis]

Could be a blocked breather on the fuel tank. This may just be a 'pinhole' in the filler cap, but if it's blocked it can cause the symptoms described.

[CageyH]

Checked that as well. Blown out using an air line.

[Yatsushiro]

blue hylomar

Proper old school.

[Audio Al]

New carb fitted and now running like new :)

Only problem with that is I now need to go and use it :( instead of sitting on my arse :doh:

[Audio Al]

Amazing how good the Honda GX31 is , JOB DONE in next to no time , The undergrowth stands no chance ,

Maybe a loan to Bev :)

[Vince]

Stick a Yammy FS1E, 'Fizzy' 50cc engine to it with a big bore exhaust on. Bigger jets in the carburettor, it will then go from cutting 3 metres a minute to 3.1 metres per minute. With to the exhaust/jets upgrade, this will go to 3.111 per minute. And you be able to hear it from 2 miles away.
Sigh...those were the days

[CageyH]

Seems like the main jet was blocked, so new fuel filter required and ordered.
I found out by blowing the fuel line out with compressed air. The primer bulb inflated, and popped..... New primer bulb ordered.

This has been one of the worst tools I have ever owned. I feel like melting it down, and making something useful like a brick out of it.
The reason I say that is that it is out of balance somewhere, and vibrates itself to bits. The most amusing time was when the fuel tank straps broke from fatigue and the tank fell off. Utter piece of sh#t. I have now made a new strap that relies on a spring to hold the tank on. That should last a bit longer.

[scotty38]

Seems like the main jet was blocked, so new fuel filter required and ordered.

You’re welcome :lol::lol::lol:

[CageyH]

You’re welcome :lol::lol::lol:

I fixed it, and it ran fine for almost a complete tank, until the end of the tank and then it started to bog down again.....
It was not the original issue, but bit me the 2nd time.

As I said it is a POS....

[scotty38]

Ah lol. I have a Stihl brush cutter, Husqvarna chainsaw and an Echo hedge cutter, all of them brilliant, not necessarily the cheapest but work just great. My Honda mowers are the same, cost a bit more but they both just run and run.

I do realise I just tempted fate....

[Audio Al]

Ah lol. I have a Stihl brush cutter, Husqvarna chainsaw and an Echo hedge cutter, all of them brilliant, not necessarily the cheapest but work just great. My Honda mowers are the same, cost a bit more but they both just run and run.

I do realise I just tempted fate....

I also have a Husqvarna 350 chainsaw :D

[CageyH]

I have Stihl, Shindaiwa, Husqvarna, Toro and Yardman gardening tools. All of them are great as they have decent engines (Kawasaki or Briggs and Stratton) except for this POS Ryobi.

It really has been terrible.

[Audio Al]

Stick a Yammy FS1E, 'Fizzy' 50cc engine to it with a big bore exhaust on. Bigger jets in the carburettor, it will then go from cutting 3 metres a minute to 3.1 metres per minute. With to the exhaust/jets upgrade, this will go to 3.111 per minute. And you be able to hear it from 2 miles away.
Sigh...those were the days

Don't tempt me :eyebrows: I have done mad conversions in the past like putting a 302 V8 in a ford capri :)