Valves and Pistons


Information and questions on GL1100 Goldwings (1980-1983)
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Bltsc2
Posts: 15
Joined: Sat May 19, 2018 2:45 pm
Location: Niceville, fl.
Motorcycle: 1982 honda goldwing 1100 interstate

Valves and Pistons

Post by Bltsc2 »



Hi. Hope someone can help. After sitting for 20 years, I got my father's 1982 1100i running. I followed the advise of this site. After it was running, had a shop put on new timing belts. I rode the bike for less that 1,000, parked it, and two days later it would start. Did the back wheel test in 5th and it didn't work. I'm new at this and have zero experience with motors. I have taken pictures of valves, cylinders (2) top of pistons. Not sure if it looks like it should. Both pistons have Mark's where pistons have hit. Any input will be gratefully appreciated. Thanks.
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DenverWinger
Posts: 1562
Joined: Thu Jun 23, 2011 2:20 pm
Location: Denver, CO
Motorcycle: (s)
1980 GL1100 STD Vetter (2005-)
1993 GL1500 Aspencade (2017-)
1983 Trav-Lite Camper (2010-)
Past rides
1972 CL350 (1980-1988) sold
1978 Suzuki GS550 (1985-2005) sold
1977 GL1000 (2002-2006) sold

Re: Valves and Pistons

Post by DenverWinger »

I don't see any marks from valves hitting.

Those relief's you see are manufactured into the pistons and are normal. For clearance of exhaust valve which is just starting to open at TDC.
♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪ :shock:

~Mark

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newday777
Posts: 1879
Joined: Tue Jan 11, 2011 5:21 pm
Location: Milford NH summer/fall & Oceanside, CA winters(N San Diego) with lots of miles riden between
Motorcycle: 2008 Cabernet Red. Level 4

1983 GL1100A Wineberry 36,000 miles

1975 CB750 K5 Planet Blue 7,800 miles

1976 CB750 K6 Anterris Red 25,000 miles

Past rides
1999A Restored from PO neglect & sold at 19,000 miles

1999SE Totaled by cager at 105,000 miles

Re: Valves and Pistons

Post by newday777 »

Most commonly the not starting and wheel test failure was hydrolock...liquid in cylinders does not compress and thus locks the motor from turning over. Was there antifreeze in the cylinders when you pulled it apart? That would be from a blown headgasket. (Common after the wings have sat unused and the head bolts were not retorqued)
BTW don't loose the little oil orifice in the center of the head (3rd picture). Replace the orings that hold them in position.

Bltsc2
Posts: 15
Joined: Sat May 19, 2018 2:45 pm
Location: Niceville, fl.
Motorcycle: 1982 honda goldwing 1100 interstate

Re: Valves and Pistons

Post by Bltsc2 »

Thanks for the help. I've had hydro lock before and tested for it first. Was hoping that was it. I've already drained all the fuild out of it. I didn't notice antifreeze coming out when I removed the head. I'm Still trying to get the right side head off so I can determine which piston is sticking. I didn't know if this is how the valves and pistons should look since I've never done this before. The bike had approximately 24,000 miles on it. I'm planning on clean valves and cyclinder head soon
. Any further advise you can give me is greatly appreciated. And thanks again.

Bltsc2
Posts: 15
Joined: Sat May 19, 2018 2:45 pm
Location: Niceville, fl.
Motorcycle: 1982 honda goldwing 1100 interstate

Re: Valves and Pistons

Post by Bltsc2 »

Just wanted to thank you for your help. I'm in parts unknown to me and hoping you guys can keep me going in the right way. Again, thanks so very much.

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WingAdmin
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Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (sold)
1998 XV250 Virago (sold)
2012 Suzuki Burgman 400 (wife's!)
2007 Aspen Sentry Trailer

Re: Valves and Pistons

Post by WingAdmin »

As was mentioned, those "divots" in the pistons are machined there, to give clearances for the valves. Typically, if a valve hits a piston, the valve and its stem are either bent or broken, and either case, the valve will no longer seat nicely in the head like yours are.

Bltsc2
Posts: 15
Joined: Sat May 19, 2018 2:45 pm
Location: Niceville, fl.
Motorcycle: 1982 honda goldwing 1100 interstate

Re: Valves and Pistons

Post by Bltsc2 »

After checking again, some antifreeze did come out when I took the cyclinder head off. If it's a blown head gasket, I already have the gaskets. And you guys will have helped tremendously and kept me from screwing up anything else. I will post the othe side once I get it off. Never knew those mark were made during the manufacturing process. Will keep you posted with pictures as I keep going. You all have given more confidence to do this.

Gavman
Posts: 3
Joined: Tue Mar 03, 2020 11:58 pm
Location: Brighton, UK
Motorcycle: 1980 GL1100

Re: Valves and Pistons

Post by Gavman »

Removing and cleaning the piston faces/heads, valves and replacing the head gaskets on a GL1100 is probably one of the easiest bikes I've ever worked on with the boxer layout presenting the cylinder heads to you nice and easily. Take your time and make sure you replace all the bolts with the correct torque settings and check them after a few heat cycles. While you have it all removed I would recommend changing the valve guide oil seals as the old ones may be quite brittle now and cause oil to seep into the cylinders making for a smoky engine. It isn't a difficult job but you'll need an inexpensive valve compressor to get the valves out, try not to lose any of the small collets that keep the valve and spring in place and ensure you replace all the valves and valve springs in the same places they were removed from. I managed all this with no real experience just a few good workshop manuals and the correct tools. Good luck

Bltsc2
Posts: 15
Joined: Sat May 19, 2018 2:45 pm
Location: Niceville, fl.
Motorcycle: 1982 honda goldwing 1100 interstate

Re: Valves and Pistons

Post by Bltsc2 »

Thanks for the info. I've ordered all the items you mention and am waiting for them to arrive. I will make sure to mark everything so I can get them back in the right place. I will follow you advise on all of this. And again, thanks.

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newday777
Posts: 1879
Joined: Tue Jan 11, 2011 5:21 pm
Location: Milford NH summer/fall & Oceanside, CA winters(N San Diego) with lots of miles riden between
Motorcycle: 2008 Cabernet Red. Level 4

1983 GL1100A Wineberry 36,000 miles

1975 CB750 K5 Planet Blue 7,800 miles

1976 CB750 K6 Anterris Red 25,000 miles

Past rides
1999A Restored from PO neglect & sold at 19,000 miles

1999SE Totaled by cager at 105,000 miles

Re: Valves and Pistons

Post by newday777 »

While you are waiting, get a piece of 1/4" plate glass 8 1/2"×11", 8 1/2×11 sheet of 400 grit wet dry emery cloth, spray 90 contact cement and a glass suction cup from harbor freight.
Glue emery cloth to glass. Sick suction cup on back to hold plate to sand the head and cylinder surfaces flat. (Remove locating dowels first).
Use a sharpie to color the surface so you can see the low spots while sanding.
Sand in figure 8 motion and vary cross over points.

Bltsc2
Posts: 15
Joined: Sat May 19, 2018 2:45 pm
Location: Niceville, fl.
Motorcycle: 1982 honda goldwing 1100 interstate

Re: Valves and Pistons

Post by Bltsc2 »

Will do. Thanks for the info.

Bltsc2
Posts: 15
Joined: Sat May 19, 2018 2:45 pm
Location: Niceville, fl.
Motorcycle: 1982 honda goldwing 1100 interstate

Re: Valves and Pistons

Post by Bltsc2 »

Parts are in, but I may need more. It finally got cool enough to take the right cyclinder head off. The number three cyclinder didn't look right. By the same token, the piston doesn't look right. I've put wd40 in the cyclinder and will see if I can get the piston free. Open for any suggestions. I'll leave you with the new pictures and thank you guys for the help.
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newday777
Posts: 1879
Joined: Tue Jan 11, 2011 5:21 pm
Location: Milford NH summer/fall & Oceanside, CA winters(N San Diego) with lots of miles riden between
Motorcycle: 2008 Cabernet Red. Level 4

1983 GL1100A Wineberry 36,000 miles

1975 CB750 K5 Planet Blue 7,800 miles

1976 CB750 K6 Anterris Red 25,000 miles

Past rides
1999A Restored from PO neglect & sold at 19,000 miles

1999SE Totaled by cager at 105,000 miles

Re: Valves and Pistons

Post by newday777 »

That piston and head, show what a valve break off and bounce around does. I have seen a hole in a piston when it happens at highway speeds.
Check the valves and seats that they close and seal properly. Someone has replaced a valve or 2.
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Bltsc2
Posts: 15
Joined: Sat May 19, 2018 2:45 pm
Location: Niceville, fl.
Motorcycle: 1982 honda goldwing 1100 interstate

Re: Valves and Pistons

Post by Bltsc2 »

Thanks. Will check everything out. It appears a screw had fallen in the chamber. Do you guys feel I'll need to replace the piston? I can get another cyclinder head if I need it. Plan is to take out all valves, clean them up, and reuse. Just hope I don't have to replace the piston.

User avatar
newday777
Posts: 1879
Joined: Tue Jan 11, 2011 5:21 pm
Location: Milford NH summer/fall & Oceanside, CA winters(N San Diego) with lots of miles riden between
Motorcycle: 2008 Cabernet Red. Level 4

1983 GL1100A Wineberry 36,000 miles

1975 CB750 K5 Planet Blue 7,800 miles

1976 CB750 K6 Anterris Red 25,000 miles

Past rides
1999A Restored from PO neglect & sold at 19,000 miles

1999SE Totaled by cager at 105,000 miles

Re: Valves and Pistons

Post by newday777 »

Good question. There might be stress fracture damage not seen in the piston susceptible to breaking off at speed, bent valves, and scored cylinder. All will have to be looked at closely and inspected properly.

indianakid
Posts: 249
Joined: Sun Sep 26, 2010 5:28 pm
Location: United States
Motorcycle: 83 GL1100 I

Re: Valves and Pistons

Post by indianakid »

The fact that the damage has hammered the perimeter of the piston my concern would be that the upper ring grove has been deformed and is pinching the ring in the groove. No way to know for sure other than disassembly of the engine.

User avatar
newday777
Posts: 1879
Joined: Tue Jan 11, 2011 5:21 pm
Location: Milford NH summer/fall & Oceanside, CA winters(N San Diego) with lots of miles riden between
Motorcycle: 2008 Cabernet Red. Level 4

1983 GL1100A Wineberry 36,000 miles

1975 CB750 K5 Planet Blue 7,800 miles

1976 CB750 K6 Anterris Red 25,000 miles

Past rides
1999A Restored from PO neglect & sold at 19,000 miles

1999SE Totaled by cager at 105,000 miles

Re: Valves and Pistons

Post by newday777 »

indianakid wrote:
Thu Aug 13, 2020 12:58 pm
The fact that the damage has hammered the perimeter of the piston my concern would be that the upper ring grove has been deformed and is pinching the ring in the groove. No way to know for sure other than disassembly of the engine.
Very true.

Bltsc2
Posts: 15
Joined: Sat May 19, 2018 2:45 pm
Location: Niceville, fl.
Motorcycle: 1982 honda goldwing 1100 interstate

Re: Valves and Pistons

Post by Bltsc2 »

Not exactly what I was hoping to hear, but will check it out. Thanks.

Terry D
Posts: 134
Joined: Thu Aug 30, 2018 3:35 pm
Location: San Antonio, Texas
Motorcycle: 2005 Honda GL1800

Re: Valves and Pistons

Post by Terry D »

You have not posted in a while. What is the final verdict?
It ain't the destination but the getting there. You are not lost until you run out of gas.

Bltsc2
Posts: 15
Joined: Sat May 19, 2018 2:45 pm
Location: Niceville, fl.
Motorcycle: 1982 honda goldwing 1100 interstate

Re: Valves and Pistons

Post by Bltsc2 »

After doing a lot of thinking about it, I have purchased gaskets and used pistons to replace the damaged one. Since the last time I wrote we're had Hurricane Sally, Hurricane Marco, and finally Beta. I hope to get back to work on it this coming week. You guys have gotten me way passed anything I've ever done. I'm unsure about the opening of the motor, so I really appreciate any further help you guys can supply. Is there anything I need to look out for when I pull the motor and open it? Thanks so much.



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