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  #31  
Old 07-10-2012, 05:55 PM
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GLoweVA GLoweVA is offline
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Edit: It was #4 piston.
Here's the thread documenting my head removal and the jugs to get at the piston.
http://www.xs11.com/forum/showthread.php?t=33964

This is what I found after I got the head off.

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80G (Green paint(PO idea))
The Green Monster
K&N A/F, TC's fuse block, '81 oil cooler, TC's homemade 4-2 w/Mac Mufflers, Raptor 660 ACCT
Got him in '04.
bald tire & borrowing parts

80SG (Black w/red emblems & calipers)
Scarlet
K&N A/F, TC's fuse block, WJ5, Shoei bags, Raptor 660 ACCT.
Got her in '11
Ready for the twisties!

81H (previously CPMaynard's)
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  #32  
Old 07-10-2012, 08:53 PM
crazy steve crazy steve is offline
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Quote:
Originally Posted by DRedel View Post
I talked with andres and I guess I'm going to try and tear my motor down....
Check the valves before you rip it apart; if you don't know when they were last adjusted, that may be the whole problem...
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  #33  
Old 07-10-2012, 09:11 PM
DRedel DRedel is offline
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I had the mechanic and he knew what he was doing with olderjap bikes but not necessarily the xs11 although he has the book for it in his garage. He took the top off and checked the valves. He said that they were all inspec except one but he dident have the right shims. But he said it wasn't that bad. I made peice today with the fact that I'm just gonna man up and fix it myself. With the form to help me I'm sure I can do it. I can't make it at worse than it already is. I'll make sure to check the valves before I go any further tho.
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  #34  
Old 07-11-2012, 05:39 AM
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natemoen natemoen is offline
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Valves and what is your compression?
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1978 XS1100E
K&N Filter
#45 pilot Jet, #137.5 Main Jet
OEM Exhaust
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LED Dash lights
Ammeter, Oil Pressure, Oil Temp, and Volt Meters

Green Monster Coils
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Vision 550 Auto Tensioner

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  #35  
Old 07-11-2012, 04:28 PM
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GTXS1100 GTXS1100 is offline
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Quote:
Originally Posted by GLoweVA View Post
Edit: It was #4 piston.
Here's the thread documenting my head removal and the jugs to get at the piston.
http://www.xs11.com/forum/showthread.php?t=33964

This is what I found after I got the head off.

Ahh Ive seen that before. Thats what number 3 looked like on my bike. It was that way when i bought it. Guy told me it had carb issues. Obviously i didnt know that the guy screwed me till it burnded all the oil out of it and locked up on me goin down the road. Found a used motor and the rest is history. Good luck on your rebuild im sure there is enough help here to ensure a success.
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79 XS1100SF (Buddys Project)
82 XJ750 Maxim (Fathers Bike)
81 CB750F SS (Buddys Project)
06 GSX600F Sold! (Was Mine)
81 XS1100 Failed Bobber Project (Mine)
81 XS1100 Parts (Mine)

Grip it, Rip it, and Stick it!!!
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  #36  
Old 07-11-2012, 06:29 PM
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psycoreefer psycoreefer is offline
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GTXS1100 and GLoweVA, did you guys both have 81 model year motors?

I'm only asking because if it is I've now seen and heard of 3 melted pistons all on 81's... and I've not seen anyone post of melted pistons on earlier years (that I've read or remember). Just wondering if there is a pattern emerging, maybe based on the leaner jetting as EPA regs cracked down on emissions???

When mine burnt it was in 100+ heat in south central CA in the middle of a road trip, bike was otherwise running great.

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  #37  
Old 07-11-2012, 09:41 PM
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cywelchjr cywelchjr is offline
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I don't know, I thought the 80 and 81's were jetted the same, but only having an 80 I could be wrong. I've got an 81 engine in mine, but the carbs are 80 carbs with everything else being from 80.
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1980 XS1100G (Brutus) w/81H Engine
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  #38  
Old 07-12-2012, 07:57 AM
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GTXS1100 GTXS1100 is offline
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Mine is an 80G and now i have the motor from a 79SF. Couldnt tell you what caused it. Just the luck of the draw i guess. Luckly i was able to pick up a motor for 25 bucks from Bob Jones's shop when they were cleaning it out.
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80 XS1100G Black Betty (Daily Driver)
79 XS1100SF (Buddys Project)
82 XJ750 Maxim (Fathers Bike)
81 CB750F SS (Buddys Project)
06 GSX600F Sold! (Was Mine)
81 XS1100 Failed Bobber Project (Mine)
81 XS1100 Parts (Mine)

Grip it, Rip it, and Stick it!!!
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  #39  
Old 07-12-2012, 12:22 PM
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ViperRon ViperRon is offline
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For things to look for in doing that type damage. Original cam chain adjuster. Valves sticking or adjusted incorrectly. Incorrect plug installed or the washer left off. Carbon buildup. heads shaved and not enough clearance. Red line overrevs. Weak broken valve springs. And my most favorite running too lean. Nitros has a habit of doing these things too.

I did know an idiot once that put a screwdriver in the spark plug hole at one time on another bike to break a bolt loose.

All you need is a little crack some heat and time.


Make sure to check the guides for buildup. When worn with bad seals they can get build up and cause a valve to stick or lag closing and just one time is all it takes
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  #40  
Old 07-12-2012, 05:54 PM
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BA80 BA80 is offline
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Those melted pistons are caused by running too lean. Carburetor issues.
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The list changes.
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  #41  
Old 07-13-2012, 01:54 PM
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GLoweVA GLoweVA is offline
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Mine was caused by running way too lean on only 2 cylinders for an entire ride home from work in the rain. I found out that I had a pick up coil issue and 2 + 3 went out and I was on the interstate and limped it home at WOT for about 25miles. #4 was just a little leaner than #1 and by the time I got home it was DONE/TOAST!

The obvious symptoms thou were NO compression on that cylinder and pressure build up in the crankcase that blew out a cam cover plug.
__________________
Hi, my name is George & I'm a twisty addict!

80G (Green paint(PO idea))
The Green Monster
K&N A/F, TC's fuse block, '81 oil cooler, TC's homemade 4-2 w/Mac Mufflers, Raptor 660 ACCT
Got him in '04.
bald tire & borrowing parts

80SG (Black w/red emblems & calipers)
Scarlet
K&N A/F, TC's fuse block, WJ5, Shoei bags, Raptor 660 ACCT.
Got her in '11
Ready for the twisties!

81H (previously CPMaynard's)
Hugo
Full Venturer, Indigo Blue with B/W painted tank.
Cold weather ride
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