FSIB20 Honda engine

[pleasant]

2 hours ago, adw said:

What is this obsession with replacing carbs, it has to be the top spare part claimed for under warranty, this i also heard from Honda during some training, black smoke from the engine is running rich, so air filter as suggested, carb flooding.

I agree repairers try and push warranty claims through for carbs, although unless it is for a manufacturing fault within the carb, then these claims are never paid by the manufacturer. As you know a carb only becomes 'faulty' due to outside influences....fuel, ingress etc etc. All of which are not manufacturing faults.

 

If it has been diagnosed it is a carb that is required then we always fit new...purely for economical reasons for the customer.  To remove a carb, strip it, ultrasonically clean it, rebuild it with new diaphragms and gaskets is more expensive in terms of labour...and the cost of the carb kit than it would be to simply fit a new carb and its guaranteed to work with no fettling and the guarantee of a new part to the customer.

 

Its fine rebuilding carbs if your time is free on your own machine or its your hobby, but commercially with hourly rates as they are rebuilding carbs costs more than new

 

 

[Ty Korrigan]

Thank you all for your replies.

 I recall the time I took a 400euro tophandle saw which was just out of warranty into a dealer for a tune and came out with a 280euro bill for a new carb.

I'm happy to try fiddling and if I screw up, just buy a fresh carb.

Question, why don't small engines have fuel filters?

Answers on a postcard please and the winner recieves a Crack a Jack pencil or pen.

  Stuart

[daveatdave]

they do it's in the fuel tank 

[spudulike]

And they have a gauze strainer within the carb to do a "belt and braces" filtration of the fuel!

[Mick Jones]

Just to add, any fine particles of dirt suspended  in the fuel/tank can bypass these filters so definately worth dumping any fuel out of the tank and cleaning fuel lines and carb paying special attention to float needle/ needle seat. Carb floats can leak too although i have found this more with the old copper floats. Worth giving the float a shake to see if there is any fuel inside.

Surely sounds like its running rich though from your description. Good luck with it.

[Muddy42]

or you could add an inline fuel filter (basically adding a filter in the middle of the fuel line).  I've added one to an old Honda engine that kept having carb issues.

[pleasant]

You can also use a funnel with a fine gauze filter specifically for fuel filtering use even before the fuel has entered the tank....however, dont try and use the same funnel to add engine oil to your 4 stroke.....you will be waiting all afternoon for it to filter through. 😄

[spudulike]

Exactly how I drain saws when I get them in and then flushing the tank out if it contains lots of crud....good advice.