Honda Engine starts but won't rev up - tip

[Jim]

Hi everyone,

Just thought I would share this for other people's benefit. I have a Honda strimmer fitted with the GX25 engine which is basically a tiny version of the GX140 familiar to a lot of towable digger owners. When I went to use the strimmer after the winter it would start and tick over but not rev up. It's only 4 or 5 years old and the spark plug looked absolutely fine. Then I remembered I had encountered this problem before with the GX140 on my digger and after a lot of messing about in the end I discovered it was just the plug. I ordered a new plug for the strimmer and as expected it has cured the problem.

It's a bit of a weird fault, but hopefully this information might save someone else a lot of head scratching.

Cheers, Jim

[Steve]

Thank you Jim

I have one of those honda strimmers but touch wood been ok, but will bear that in mind. 

Sent from my iPhone

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[A Happy Man]

Many thanks for this tip, Jim. 

When I read that the GX25 was running a strimmer, I immediately thought ''2-stroke'' But then saw your comment

'' ...  the GX25 engine which is basically a tiny version of the GX140 familiar to a lot of towable digger owners.''

Being an inquisitive type, I searched for the GX25, and was astonished / delighted to read :

 

FULL 360° "ANY-SIDE-UP" OPERATION

Mini 4-Stroke Series

The innovative design of Honda’s Mini 4-Stroke engines allows them to be used and stored in any position for full 360° usability. Upright, sideways, even upside down – the Mini 4-Strokes will still run great.

An exclusive Honda rotary-slinger lubrication system keeps oil in a completely misted state and circulates it using pressure fluctuations generated by the movement of the piston.

Built-in passages effectively return the circulated oil to the oil reservoir from every part of the engine.  An oil return port positioned in the center of the reservoir prevents oil from accidentally flowing into the combustion chamber.

​Is nothing sacred? No more oiled up plugs? Bah !

Best Wishes

Anthony​

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[Jim]

Hi Anthony,

It is an amazing little engine and apart from this incident it has been very reliable.  I bought it at the time because Honda were offering a five year guarantee on the strimmer. I think these little GX25 engines are also used in Honda's smallest generators.

As you say, the main advantage is not having an oiled up plug!

Cheers,

Jim