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Ryobi BP42 leaf blower will start but will not rev up when I push the trigger - how can I fix this?

Posted by Anonymous on

  • William Frankford
    William Frankford Jun 05, 2018

    On this model, there is what I would call a factory defect. There is a tiny hole in the heat dam gasket on the engine side of the carburetor that is situated too close to the large air intake hole. The gasket will eventually fret away between the small hole and the large hole due to the high velocity air flow. The end result is that the small hole opens up to the large hole causing the carb to supply too little fuel and bog when you rev it up. Replace the heat dam gasket and the blower will work properly.



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  • 430 Answers

Its a lean condition, not getting enough fuel. Check fuel filter and fuel lines. be sure you have fresh fuel. and the carb needs to be adjusted or rebuilt.

Posted on Jul 28, 2014


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Posted on Jan 02, 2017



  • 8 Answers

SOURCE: ryobi leaf blower #8544,25.4 cc

I have a McCulloch, that the hose rotted off the fuel strainer in the tank, I replace the hoses, it ran for awhile then stopped, removed the carb. an have cleaned, { 7 Times} it runs for awhile then stops, Usually I dump lighter fluid in the carb. if it starts Ign is OK if not its a fuel problem. You could check on the filter, I still have a problem with mine, its a pain when your on the roof an it stops. so check the fuel filter is the only thing I could suggest to you GOOD LUCK

Posted on Nov 11, 2008


  • 56 Answers

SOURCE: Need Blow Apart Diagram.............

Posted on Apr 03, 2009

Jeff Hagemann

  • 430 Answers

SOURCE: Ryobi backpack blower will run all day with choke

Thats a lean condition. Check fuel lines and fuel filter. If the fuel ilnes are discolored or stiff or really super mushy, If the fuel filter has become detatched from the fuel line then the fuel lines need to be replaced.
If the carb can be adjusted you can try to adjust but its likely that the carb should be rebuilt with new diaghrams and gaskets.
Adjust by turning the low speed screw out ( counterclockwise) 1/2 a turn. The low speed screw is always the one closest to the motor and usually marked on the carb body with an 'L'. When you richen a motor up the idle will drop so you will probably have to turn the idle screw in 1/2 a turn. 1 and 1/2 turns out from light bottom is standard starting point ( 2 turns for poulan products). If you get more than 3 and 1/2 turns out on the low speed screw or if turning the screw has little or no effect then the carb should be rebuilt.

Posted on Dec 13, 2009


  • 4 Answers

SOURCE: My Ryobi RBL30MVA. leaf blower will not start,

I have had this exact same problem with the same model after just one hours use.

Returned it a week later and after 2 months the replacement did the same thing.

Returned that one and got a third. A week later that ones doing the same thing again after only an hour or so use.

Obviously some defect in them.

I'll be getting my money back and visiting the local mower center to get their help rather than doing the guess work my self and ending up with a dodgy model

Posted on Dec 24, 2009


  • 1 Answer

SOURCE: diagram of fuel lines for ryobi 280r leaf blower

The line out of the bottom of the fuel tank goes to the curved brass line coming out of the carburetor and the straight brass line out of the carburetor goes to the short side coming out of the primer bulb. The long side of the primer bulb goes back to the fuel tank.

Posted on Jun 12, 2010

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