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Should I remove the carbon?

Old 03-06-2007, 05:50 PM
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Red face Should I remove the carbon?

I have to replace the rear cylinder head on the SHawk, I was wondering if I should remove the carbon on the piston before I put it together or is this worth the effort, and how do I do it with out destroying anything
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Old 03-06-2007, 06:14 PM
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You could go either way. If you do it to one you should do it to the other I would think. It just makes sense. So, if the other head is not off then just trim up the edges lightly with a wire brush and call it a day.
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Old 03-06-2007, 06:29 PM
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I've never been a real fan of this. I'm just too paranoid about the **** getting down in the rings. I'll clean up the head while I got it off but I leave the deck of the piston alone. I use my shop vac with a concentrator nozzle to keep all the debris out of the cylinder as I'm removing the head beyond that I don't touch it. I've been told by other mechanics not to even rotate the engine while the heads are off. Just my .02
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Old 03-06-2007, 08:57 PM
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unless your removing the cylinders and replacing rings and gaskets. your as likely to cause a problem as you are to fix it. If there is a lot of carbon, then you NEED to clean the pistons and most likely replace the leaking rings causing blow by. It's not something that works as a band aid though. If there is a lot of carbon, there is a reason, not fixing the cause, means it's not worth your time to address the symptom. Unless your ready to do rings, bore and plate the cylinders (NSC = Nickel Silicon Carbide Coatings the only way to go IMHO on a new bore) leave the pistons alone. When you say replace the head,, your just talking about the valves you bent yes?
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Old 03-07-2007, 03:12 PM
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If it's a heavy buildup as TX says, then I agree. You need to fix the cause, not the effect. There's an old mechanic's trick that I've used in the past with good results. It involves using a spray bottle of water and misting the water into the carb openings as you're running the bike. You essentially steam clean your combustion chamber. I did it with my old 78 T-bird and an 82 Camaro I had with no ill effects. I've not tried this with a bike though.

With bikes I find that flogging the **** out of them at the track and using race gas works well too.
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Old 03-08-2007, 06:52 AM
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little bit of diesel in the gas will clean out an engine. like .25 gallons in about 5 gallons of gas, i do everything of mine like that a couple times a year. carbed or fuel injected. again this does not fix the reason for having excess carbon, but it does help clean up the enside of an engine.
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Old 03-10-2007, 10:06 AM
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hummmm, Zed. I have also heard of adding nail polish remover to my fuel to give me 100mpg. ---with the probability of , boom!
how long has the diesel additive been working for you?
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