Outboard tune up.

Surely that's just bog-standard solvent carb cleaner rather than a spray which is designed to be combusted in the engine to clean the combustion chambers?

By the way, I use brake and clutch cleaner for carburettors as it's the equivalent of carb cleaner but usually seems to be cheaper.

Richard
For the life of me I dont know how some of these "spray whilst the engine running" carb cleaners haven't been done for trades description. There is no way carb jets and float chamber can be cleaned in this way.
I clean hundreds of carbs. IMO no carb cleaner is better or worse than the next one. I tend to buy whichever is cheapest at the time. As Richard says Brake cleaner or any other solvent cleaner is fine. Take care spraying around o rings or neoprene needle tips.
 
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For the life of me I dont know how some of these "spray whilst the engine running" carb cleaners haven't been done for trades description. There is no way carb jets and float chamber can be cleaned in this way.

Absolutely. The stuff doesn't even run through the float chamber or jets.

You can run alternative fuels which do effectively clean the combustion path but this is a complex and costly procedure. I think the "spray into the intake" methods are designed to be confused with the proper system so people aren't sure what they are getting.

One of my petrol engines runs very cleanly after 160k miles and I'm told that this is because I run it a lot of this time on LPG (propane/butane) and apparently this burns out the products of petrol combustion. This is a similar process to the commercial cleaning process although I've never stripped down a gas engine to see if it's true.

Richard
 
It is not sold as a carb cleaner!

Seafoam Motor Treatment appears to be a popular product with American outboard users and is about half the price

https://www.amazon.co.uk/Sea-Foam-M...5448&sr=8-1&keywords=seafoam+engine+treatment


Suggested methods of use here:

http://forums.iboats.com/forum/engi...ntly-asked-questions-faq/162221-decarbing-faq

True Vic
Heres a true story about removing carbon from engines
A few years ago I used to race Pro karts with 2 honda engines. Engines had to be strictly stock so we used to compress used head gaskets to increase compression. The powers that be cottoned on to that so we used tonleave as much carbon as possible in the combustion chamber to increase compression. Didnt increase it much but better than stock
 
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