Engine Advice Please


Technical information and Q&A applicable to all years and models of Goldwings
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Bummer15
Posts: 2
Joined: Thu Nov 21, 2019 8:09 am
Location: Fargo, ND
Motorcycle: 1981 GL1100
2015 FJR

Engine Advice Please

Post by Bummer15 » Thu Nov 21, 2019 9:35 am



I recently bought an 81 GL1100 for a project. It was not running when I bought it due to an 8 year storage. The bike has 40,000 miles on it and cosmetically in great shape. Compressions on all 4 cylinders were good when tested cold so I went for it knowing I would rebuild carbs, upgrade the stator, fork seals and so on. After pulling the exhaust pipes and intake tubes I found the valves don't look great. Here is where I need some expert advice. The intake valves are covered in carbon. Two of the exhaust valves have this gold tint to them and are filthy as well. I understand the carbon but this gold tint on the exhaust valves is a mystery to me. Question: With only 40K on this motor, do I run it "as is" or should I start pulling the heads? I'm hoping that with some Sea-Foam and strong highway miles the carbon will take care of itself? :) Any advice is appreciated!

Intake Valve @ 40K miles
Intake Valve @ 40K miles


Exhaust Valve @ 40K miles
Exhaust Valve @ 40K miles




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AZgl1800
Posts: 1925
Joined: Thu Oct 30, 2008 2:46 pm
Location: Lake Oologah Indian Territory USA
Motorcycle: '02 GL1800

Re: Engine Advice Please

Post by AZgl1800 » Thu Nov 21, 2019 11:56 am

some one has been running High Test, 91 octane or higher gas in that bike.
very detrimental to Goldwings.

If the compression is decent, just use regular 87 octane fuel with something to clean up the dirty carbon deposits. It will eventually clean up.

I think that I would use MMO, "Marvel Mystery Oil" added to the gas tank, for a long time at their recommended amount.
~John
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rickf1985
Posts: 5
Joined: Tue Apr 17, 2018 4:09 pm
Location: Pemberton N.J.
Motorcycle: 1998 GL1500

Re: Engine Advice Please

Post by rickf1985 » Thu Nov 21, 2019 8:09 pm

The gold is actually a light brown I think you will find and it is ash which is usually from burning oil. But I have seen it a lot in engines where people add additives thinking they are helping the engine out when in fact they are harming it. The ONLY additive I will use or recommend id Marvel and that is based on personal experience from some rather extensive testing on a fleet of antique cars I was commissioned to do many years ago. The fact of the matter is that today's gasoline's have alcohol in them and on top of that a package of detergents that do a very good job of cleaning the engine. It is when you add more stuff to it that things go bad.

Bummer15
Posts: 2
Joined: Thu Nov 21, 2019 8:09 am
Location: Fargo, ND
Motorcycle: 1981 GL1100
2015 FJR

Re: Engine Advice Please

Post by Bummer15 » Fri Nov 22, 2019 7:13 am

I really appreciate the input! The compressions are good so I'll just get it back together as planned and skip the engine teardown. Thanks much!!

pocketchange
Posts: 29
Joined: Fri Aug 09, 2019 10:21 pm
Location: Houston, Texas
Motorcycle: 1994 GL1500 SE

Re: Engine Advice Please

Post by pocketchange » Sat Nov 23, 2019 5:39 pm

Squirt (a little) MMO into the cylinders and turn it over a few times. Let the MMO sit for a few hours or a day or so.
Startron (fuel additive) and fresh gas, check the carbs and see how it runs... 1st.
Stay Positive... pc

JOLLY
Posts: 22
Joined: Tue Aug 22, 2017 9:23 pm
Location: Bonham, Texas 75418
Motorcycle: 1986 GL1200A Aspencade

Re: Engine Advice Please

Post by JOLLY » Tue Dec 03, 2019 10:17 am

I would ride it and not worry about it.

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newday777
Posts: 1302
Joined: Tue Jan 11, 2011 5:21 pm
Location: Milford NH summer and 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 and sold at 19,000 miles

1999SE Totaled by cager at 105,000 miles

Re: Engine Advice Please

Post by newday777 » Wed Dec 04, 2019 11:42 am

These motors are built robust and will probably run but..... After sitting the length of time as yours has, these 4 cylinder wings blow head gaskets after bringing them back to life.
Your best option, pull the heads(be sure to set belt timing to #1 TDC FIRST!!!), clean inspect the heads, flatten the heads and motor surfaces on a 8x11 sheet of 1/4" glass with 220 wet/dry emery paper, lap the valves by hand, new valve guide seals, reassemble using Honda head gaskets and orings.

HOW TO REPLACE THE HEAD GASKETS
viewtopic.php?f=11&t=14868



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