Yes, it would be applicable and compatible. The way it worked was that the '84 KLR600 was the baseline. Every year after that a supplement was published that brought the baseline up to date. For example, the '84 was kick-start only. The supplement for the '85 KLR600 would have introduced the addition of electric start. The addition of electric start impacted the wiring loom, the ignition system, engine dis-assembly, re-assembly, handlebar controls, etc. All those things would have been documented in the '85 supplement and they would have been carried through in later supplements. All later supplements would have this information plus any information that was introduced specifically for the later model year.
What you need for your '87 is the base manual for the '84 KLR600 and the supplement for the '87 model year. You do not need to have the '85 and '86 supplements.
As a new owner, you will find Dave Pelletier's post very helpful: https://www.klrforum.com/1987-2007-w...kes-avoid.html
This spec sheet has a color wiring diagram, though it is a bit later than yours. It is still generally applicable: https://www.klrforum.com/1987-2007-w...t-gen-1-a.html
Here is a link to only the color wiring diagram: https://c1.staticflickr.com/3/2319/2...82c4ea30_b.jpg
A site that is stuck in time and not been updated since before Obama but good for Gen 1 service: MarkNet - KLR650
A couple of YouTube channels with good content:
Tim has moved on to a BMW but he was prolific with KLR650 content: https://www.youtube.com/channel/UCVa...SvtyZZ-rTBKrWQ
Some info on general KLR maintenance and info, especially doohickey and carburetor: https://www.youtube.com/souperdoo
Info on some of the more important KLR issues and fixes plus a lot of KLR tomfoolery: www.souperdoo.com
Understand that, in the broad sense, KLRs should be divided up into major groups that have the greatest similarity to one another:
1984 - 1987, the KLR600's. Smaller tank, different rear subframe and main frame, drum brake in the rear, had kickstarter.
1987 - 1995, the Gen 1 KLR with no kickstart, new frames, disk brake in the rear, revised rear suspension, kickstart eliminated, new dash, larger tank, revised bodywork, etc.
1996 - 2007, the Gen 1.5 KLR with improved cylinder, revised balancer, different clutch, strengthened case, etc.
2008 - 2014, the Gen 2 KLR with revised bodywork, revised suspension, new ignition system, stronger charging system, revised swingarm, larger brake disks with dual-piston, calipers, better lighting, etc.
2014 - 2018, the Gen 2.5 with the introduction of the 2014.5 KLR with improved suspension and a better seat.
We don't use the '.5' designator; we simply refer to KLR600, Gen 1 (1987 - 2007), Gen 2 (2008 - 2018) but it is important to remember the major change years of 1987, 1996, 2008, and 2014.5 because these years introduced major changes that affect parts interchangeability.
We jokingly refer to the changes in other years as nothing more than Bold New Graphics
but it is important to note that there were subtle changes made almost every year, many were improvements. Usually, the new parts were interchangeable with the old parts. There is a lot of backward and forward compatibility such that "better stuff" can be carried both forward and backward to suit your needs. My bike is a 2009 but it has a Gen 1 ignition system, Gen 1 radiator, Gen 1 rear suspension linkage, Gen 1 valve cover, a kick start, KLR600 clutch and primary gears.
"Welcome to the jungle, we've got fun and games and an appetite for destruction," Tom sang out.