I have torn down my 32cc Weedie and it has carbon build up on the piston head and underside of the cylinder head.....

The piston is still attached but the cylinder is separated..

What is the best way to clean them?
What solution (antifreeze, acetone?) bath should I use?

Thanks
Darren

Anti freeze in a low temperature crock pot works good. I have also used Gunk engine degreaser citrus scented. Then a wire brass wire brush. Put them back together with new bearings, gaskets, and rings and run them on synthetic oil and they stay real clean.

Hi,

I've been a mechanic for 35+ years, and short of a hot tank, I really haven't found anything that will really dissolve carbon well. The antifreeze/crock pot deal works great for glow engines with castor oil deposits, but I haven't found it to do a thing for gasoline/oil created carbon deposits. Any of the chemical cleaners that did do anything good at all have been outlawed by our loving government.

The best I can suggest is to soak everything in a solution of paint thinner (mineral spirites) and automatic transmission fluid. This will not remove the deposits, but it will make them softer and easier to remove with plastic tools, then either a brass wire brush and/or Scotchbrite pads.

Cleaner up!
AV8TOR

Acetone should work[:-]

Thanks Gentlemen!

Try propileneglycol at 90ºC not less than 2 hs., then plastic brush, it works for me

hammer and chisel, finish off with angle grinder...




dave

Just curious if anyone has ever tried SEA FOAM MOTOR TREATMENT?

I have used Power Tune made by the Mercury outboard motor company. It is used to dissolve carbon in 2 stroke outboard motors. I put the parts in a ziplock bag, then spray the cleaner in and shut the bag and let them sit for a day or so. A lot of the carbon dissolves and the rest is then easily removed with a little scraping. Other outboard makers sell similar stuff under different names.

W5RA

How do I clean the underside of the cylinder head?
I can't get down inside?
I put the plug back in, flipped it over and partially filled it with carb cleaner........
How do I scrub?

Any suggestions?
Darren

Best way to use Sea Foam, Power Tune and similar products is to run them through the engine (mix ~ 1/3 Sea Foam, 2/3 gas, then the right amount of oil). Run the whole tank empty, let sit for an hour or so, then run engine on normal mix of gas/oil (fly it is fine). The important place to get rid of carbon is the ring lands and exhaust port area. One or two treatments should do it and no disassembly required. Sea Foam is available in NAPA stores and other auto parts places. The same product is available in an aerosol form called Deep Creep. I would spray about 1/4 can into the carb throat with engine at a fast idle, let sit for an hour then run normally. If you have much carbon, the motor may smoke for a minute or so, then clear up. I've been using this stuff for years with 2 stroke outbord motors.

I use aerosal brake cleaner and it seems to work fine.

Mike

One thing that really helps is to spray a fine mist of water into the carb with the engine at running at operating temp. and at 3/4 throttle. This will remove the carbon down to the first ring.

Then run it untill by blocking off the cooling fins untill it's hot, not too hot, turn it off and then fill with automatic transmission fluid and let it set 12 hours.

This has freed up rings in engines that were no longer free.