Carb classes

[thinwater]

It’s now known to cause more issues than just moisture related. Started seeing it attack the components and fittings of the fuel system itself. Some of the OEM like mercury have since released service bulletins around it.

That has been a known issue in the US for 20 years.

For the most part, it an issue with pre-ethanol motors, but it can still be a problem if they take shortcuts on quality. Some non-US, non-ethanol country motors are NOT fitted with ethanol resistant parts. Pretty stupid IMO.

 

[Beneteau381]

It’s now known to cause more issues than just moisture related. Started seeing it attack the components and fittings of the fuel system itself. Some of the OEM like mercury have since released service bulletins around it.

That has always been the case with polymers in the fuel system. Garden equip engines in particular, E10 is making it worse.

 

[ashtead]

Having watched one of these videos there seem a lot of bits to lose but assuming I manage that bit what sort of service kit is needed? Is it just one gasket or do people use the full set of bits?

 

[thinwater]

Having watched one of these videos there seem a lot of bits to lose but assuming I manage that bit what sort of service kit is needed? Is it just one gasket or do people use the full set of bits?

80% of time all that is neeeded is a cleaning and no kit.

Not that many bits, since you don't disassymble more than needed. Normally, just the jets.

Open, remove the jets and clean, spray clean, put it back together, and start the motor. Easy-peasy.

 

[RunAgroundHard]

... Honda marine did a carb manual. This book taught me everything. If your interested in learning this book is for you

Top link is Honda Marine carburettor manual, lower link is a general Honda carburettor manual. Both can be downloaded without signing up to a subscription service.

https://www.virtualware.nl/wp-content/uploads/Honda-carburation-manual.pdf
http://www.ipspower.com/images/docu...buretor-Troubleshooting-Manual-Compressed.pdf

Good thread this as I will be servicing my Tohatsu 2 stroke this winter.

 

[ashtead]

Thanks for advice thinwater -I will try just removing jets as a starter. I would like it working again if possible.

 

[Spirit (of Glenans)]

Works for me, I clean carbs daily, transition ports on most new carbs are accessible, long micro drills can access main and pilot jets, emulsion tubes seldomly block

Is an ultrasonic cleaner any good for cleaning jets?

 

[Beneteau381]

Is an ultrasonic cleaner any good for cleaning jets?

Useless, need to physically clean out jets and passageways

 

[Beneteau381]

80% of time all that is neeeded is a cleaning and no kit.

Not that many bits, since you don't disassymble more than needed. Normally, just the jets.

Open, remove the jets and clean, spray clean, put it back together, and start the motor. Easy-peasy.

Probe the passageways as well

 

[thinwater]

Useless, need to physically clean out jets and passageways

Agreed. Much more sails pitch than actual effectiveness. Yes, I have one, have used it on many things, and mostly, it's not effective on things like this. It's mostly for cosmetics and can do damamge.

 

[Steve65]

Top link is Honda Marine carburettor manual, lower link is a general Honda carburettor manual. Both can be downloaded without signing up to a subscription service.

https://www.virtualware.nl/wp-content/uploads/Honda-carburation-manual.pdf
http://www.ipspower.com/images/docu...buretor-Troubleshooting-Manual-Compressed.pdf

Good thread this as I will be servicing my Tohatsu 2 stroke this winter.

This book doesnt cover slide carbs, which your Tohstsu will have. Luckily yours is very basic, it hasnt a slow running circuit and only a main jet to worry about

 

[Steve65]

Useless, need to physically clean out jets and passageways

I agree regarding U/S cleaners cleaning carbs, they are useful in cleaning Honda nylon pilot jets though