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  #1  
Old 14th January 2014
islanddave islanddave is offline
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Default Decarbonizing Pistons

Hello,

Well this has turned into quite the project here. I have started numerous threads here. This one has to do with pistons. I was originally just going to replacing weeping base gaskets, by pulling the jugs but leaving the pistons in their respective bores. This way I would avoid having to re ring and hone. The pistons have alot of carbon on them. I also suspect it is oil build up due to the fact that it ran the stock air box for most of it's life. Is it possible to remove the heavy build up with the pistons still in the bore?

I'm guess yes but the best way would be to pull them. If I did this I would have to re ring and hone. I'm guessing in my area if I could find a reputable/competent place this would put me back about $300.........this is half way to a perfectly done 1250 kit.

Please advise.

Thanks Dave
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  #2  
Old 14th January 2014
NRHS Sales NRHS Sales is offline
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A set of rings for those pistons is $43 for the pair from NRHS. You can get a nice ball hone quite cheaply on e-bay.
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  #3  
Old 14th January 2014
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Shu Shu is offline
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Is this all being done to an 883? How many miles on it?
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  #4  
Old 14th January 2014
NRHS Sales NRHS Sales is offline
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It is posted on the Buell page so I was assuming it is a 1200 Buell engine?
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  #5  
Old 14th January 2014
islanddave islanddave is offline
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Quote:
Originally Posted by NRHS Sales View Post
It is posted on the Buell page so I was assuming it is a 1200 Buell engine?
Yes 1200 Buell cyclone.......with about 28000 miles on it. Would I just buy a standard set of rings? How hard is it to ball hone cylinders? Yes I have a FWM on order. Believe it or not it was cheapest from my local Harley dealer. I just really can't believe how much build up are on the pistons.the front one in particular. No wonder I was getting pining this past summer...I mean the valve pockets have major deposits.
The cross hatch seems good, and there is minimal scuffing on the skirts, but the front piston and cylinder does have some vertical scratch marks at the front of the bore that my finger nail can catch on so maybe a rebore rather than a simple hone?

Thanks Dave
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Old 14th January 2014
NRHS Sales NRHS Sales is offline
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it all depends if you just want to get it running decent or do you want to do it right for long term?
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  #7  
Old 14th January 2014
islanddave islanddave is offline
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Default

Well I guess I now feel like how far down the rabbit hole do I want to go?

The tranny needs to be addressed slips out of 2nd gear temporarily...and the front connecting rod has shake in it but don't know how much is permissible? Haven't looked at the rear rod yet.

Doing it right and cheaply is not an option I know. It runs great I just wanted to address the tranny, and rear base gasket leak. If the base gasket didn't leak I wouldn't have torn into it. I think it started to leak because I rode it late into the season here when the temp was really cold, and blew the rear base gasket out due to the thickness of the engine oil at low temps at start up.
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Old 14th January 2014
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aswracing aswracing is offline
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Quote:
Originally Posted by islanddave View Post
Yes 1200 Buell cyclone.......with about 28000 miles on it. Would I just buy a standard set of rings? How hard is it to ball hone cylinders? Yes I have a FWM on order. Believe it or not it was cheapest from my local Harley dealer. I just really can't believe how much build up are on the pistons.the front one in particular. No wonder I was getting pining this past summer...I mean the valve pockets have major deposits.
The cross hatch seems good, and there is minimal scuffing on the skirts, but the front piston and cylinder does have some vertical scratch marks at the front of the bore that my finger nail can catch on so maybe a rebore rather than a simple hone?

Thanks Dave
Dave, there's nothing about pulling the pistons from the bore that necessitates new rings. I wouldn't worry too much about that.

If you want to know if the cylinders/pistons/rings should be serviced, and whether they need an overbore or you can get away with a quick hone and new rings, the only way to know is to make the measurements. Anything else is just guessing. The service manual shows the bore dimensions and service wear limits.

Something you should probably do is read this thread I created several years ago: http://www.xlforum.net/vbportal/foru...ad.php?t=15735
It's an eye opener to measure factory cylinders sometimes. Measurements are the only way to know what's going on.

If you decide it needs an overbore, the measurements will also tell you how far you'll need to go to clean it up. You could do a service overbore with new oem pistons & rings for about $350 (assuming you can still get those pistons, I haven't checked lately). With forged pistons you're looking at closer to $500. Another option is a 1250 kit; we offer 1250 kits for your bike with premium ultra light and strong forged pistons, and strong, straight, round cylinders, for $540, see this thread: http://www.xlforum.net/vbportal/foru....php?t=1719215
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  #9  
Old 14th January 2014
Jörgen Jörgen is offline
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Dave
If you pull off the cylinders, carefully note how each piston ring is clocked. Otherwise I wouldnt recommend to put the top end together witout deglazing and new rings.

I would rebuild the top end, a lot of carbon is often caused by bad ring seal. Blow by pushes oil through the crank vent.
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Old 14th January 2014
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if your measurements are still in spec you don't have to remove the pistons from the bore to clean them,after you got it back together and the scoot is nice and hot....just spray(mist) of warm water into the intake(without the a/c) while ya got the revs in the 2k mark.
It will take carbon build up out of the engine make sure there is nottin behind the scoot or it will get covered with crap.
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