Decarb 55hp Rude

[Thunderhawk]

Hey everybody, I did a decarb on my 1968 Rude, all seemed to go OK. Question is how clean should the tops of the pistons be? The gunk looks a little thinner but the pistons are still black. This is the first one I have done. Any comments?


Thanks and happy holiday

 

[coolguy147]

Re: Decarb 55hp Rude

seafoam

 

[Thunderhawk]

Re: Decarb 55hp Rude

I did a Seafoam decarb today, any idea how clean the pistons should look?

 

[billy4hp]

Re: Decarb 55hp Rude

I did a Seafoam decarb today, any idea how clean the pistons should look?

You'll never get the tops of the pistons completely clean unless you pull the heads and scrape away... The trick is the Sea Foam really frees up the piston rings which in turn gives you better compression and therefore more power...

I ran an engine dyno for 10 years and have built engines for much longer than that, even four stroke engines will get a thin carbon film on the tops of the pistons in as little as 10 minutes of running which is completely normal and a four stroke isn't mixing the engine lubricant in with the fuel to boot like your two stroke is...

If you followed the decarb instructions found here your just fine...

Good luck,

Billy

 

[tashasdaddy]

Re: Decarb 55hp Rude

Decarb, take a can of seafoam put 3/4 of it in the gas tank, with only 1 gallon of premixed gas. put the rest in a spray bottle. start the engine, and let it come up to temperature. then remove plugs, and them some real good shot of seafoam into the cylinders, replace plugs, let sit 15 minutes. restart, and spray the rest of the seafoam into the carbs, so the the motor almost stalls, wait and repeat until the seafoam is gone.then take for a wide open spin. then put in new plugs, ad premixed gas to the tank, and take it for a wide open throttle spin. it is going to smoke like a house on fire, during this process.

afterwards compression.recheck