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  #1  
Old 27th August 2017
Mad Max Mad Max is offline
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Default New piston rings when removing cylinders for cleaning?

Hi,

I am planning to remove my cylinders as I already removed the heads to get them dual plugged.

I thought why not remove the whole top end and clean it all up and put some new paint on them.

But is it wise to keep the piston rings that are already in there? As far as the wear on them that matches the cylinder wall. Or is it really important to hone them when you dismantle everything?

Or can I put some new rings on and forget about it?

Thanks!
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  #2  
Old 27th August 2017
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If you put it all back together with all the rings in the same places on teh same pistons etc, it will be OK.
But if your engine is a bit worn, you might as well pay the little bit of money for new rings and get the cylinders honed. You should look at your valve guides while you have it all open too. Replace if worn, and recut seats.
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Old 27th August 2017
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You went to the extra troubles and big expense, i.e. maching for dual plugs and purchasing a new dual plugs set up for your new igntion system. AND took the heads off for pretty things up, why not go all the way with a quick ball hone and like Hopper saids,check out the heads too. With more efficent heads, may have to redo the timing, less advance due to more efficent combustion and it may call for re-jetting too.
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Old 27th August 2017
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I like how my engine runs now, I don't want to touch things when it's all good.

The only reason I dual plug my heads is because my plugs foul quite often and it really is the most annoying thing.

I have a new Mikuni TM 40 on it right now and need to tinker it a bit more or get it on a dyno.

Dual plugs sounded as a good way to go for increased power and less fouling.
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Old 27th August 2017
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Before you pull the cylinders off, lift them a few inches up and place shop rags around the rods to catch anything that may fall off with the barrels. Things that can fall into the engine are broken rings (not uncommon) chunks of carbon and broken gaskets. and loose snap rings off of the piston pins.
With the barrels off, carefully remove the top ring and place it in the appropriate barrel (below the carbon ring at the top if any exists) measure the end gap of the ring. Move the ring about halfway down and measure again, them move it all the way down to the end of piston travel (you will see it as the shiny portion) again measure the end gap. Determine the end gap of a new set of rings from the ring maker. If the measured gap is much greater, like twice, the rings are worn. If the end gap varies greatly as the ring goes down, there is taper in the bore. Some taper is expected a lot means that the cylinders should be bored. If not, eventually the rings will break. If you intend to put the same rings back into the barrels, it is a good idea to knock the shine off the bore with emery cloth and completely remove any carbon from the top of the bore. Then wash the barrels with hot soapy water to remove any junk from the bores. I would recommend what others have suggested while you have the heads off. The guides not so much but you can remove the collars and keepers and hand lap the valves with some fine grit compound. Smart money says do this while you have it apart, but if the engine runs well and has good compression, ??? If you don't have a genuine HD manual, buy one,
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Old 27th August 2017
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What makes you think dual plugging will fix a plug fouling problem?
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Old 27th August 2017
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Quote:
Originally Posted by ryder rick View Post
What makes you think dual plugging will fix a plug fouling problem?
+1

You mentioned you liked the way the bike runs now but fouling plugs??
Tune it and you'll be in for a real surprise.
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Old 28th August 2017
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With the Mikuni TM 40 carb, you are problary over-carbutored, too much fuel. What color are the sparkplugs? I run the Mikuni VM 38 carb which IS made for the stock Sportster IH ,it works good too. My theory is when carb running too rich, it washes off the oil flim on the cylinders,creating a metal to metal contact between the rings and cylinder bores. When your rings are worn out by this, there is no longer oil control resulting in excess oil in the cylinder bores. Therefore fouling your spark plugs. Somewhere in this forum ,a gentlmen said to tune the motor right away, timing and jetting to prevent problems down the road.
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Old 28th August 2017
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If I pull the cylinders off I always re-hone at a minimum.
When your finished and washing them, do it properly. Wash and scrub until they are CLEAN ! That means when you wipe a clean white linen cloth inside them the cloth comes out without ANY black on it.
Feel for a ridge at the top of the cylinder. If you can feel any kind of ridge there they need to be re-bored. And/Or measure them very carefully.
Dual plugging a head will make it run cleaner and better. But it won't fix poor carburation or ignition.
But I presume it's getting a new ignition system if your now dual plugging.
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Old 28th August 2017
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Quote:
Originally Posted by Indian Joe View Post
With the Mikuni TM 40 carb, you are problary over-carbutored, too much fuel.
The Mikuni TM 40 I have is specifically jetted for a XLH 1000.

http://www.mikunioz.com/shop/mikuni-...ead-xl-sporty/

It is harder to read the overall mixture because there is an accellerator pump attached.

Think that I will get the whole setup clean and into spec and get the motorcycle on a Dyno.
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