78 GS1000, next project

[Guest]

Got another GS1000, this one is a 1978 GS1000C it turns out. It is completely dissasembled and the engine has a problem. It turns but will not turn all the way around. So I will be pulling the head off to see what is the problem with that. Seat is in nice shape as is the rest of the bike except for the tank. I will have to de-rust that and seal it. This bike has spoked wheels and a single fron disk. Not exactly what I will be doing with this bike but I am leaning towards stock. I will definately be replacing the points with an electronic ignition. Any one have one of these? Is the single disk sufficient to stop the bike?

[chuck hahn]

The brakes are sufficent once your done disassembling them and fully rebuilding ALL the components. Brakes are NOT ann area you want to second guess anything on. Do them right the first time and youll be safe.

[chuck hahn]

Heres my recent rebuild thread after some degreaser ate my paint......

http://www.thegsresources.com/_forum/showthread.php?220537-My-78-1000c-needs-some-love&highlight=my+78+GS+1000C

[steve murdoch]

As Chuck said, a refurbished single disc setup will work fine but if you are doing a rebuild of the brake system i would into the Salty_Monk dual disc upgrade.
Improved braking and it looks better.

http://www.thegsresources.com/_forum/showthread.php?140253-Twinpot-Brake-upgrade-on-78-Skunk&highlight=dual+and+upgrade

[bomber737]

I looked over your rebuild Chuck, looks nice and thats a really nice bike. I see you have drilled disks. Did you do that your self? I was planning on replacing the brake lines with stainless and I will be rebuilding the calipers. Did you hone the inside of yours out? replace the puck? I will have to see what condition mine are in. I am also planning on replacing the 630 chain with a 530 and new sprockets. One question, the carbs are corroded and I have a servicable set of 750 carbs. Are they interchangeable? My 750 carbs are mechanical.

[chuck hahn]

Yes the VM 26s from the 750 are the identical ones on the 1000s except the jets are different. Some 78 750s had the 97.5 OR the 102.5 mains and 17.5 pilots. Youll need to see what jets are in the ones you have. The 77 750s had 95 mains and 17.5 pilots I think. Other than that its the same get up.

Discs were on mine when I got it. Stockers werent drilled far as I know. But I may be wrong on that. my calipers are all stock pistons. I rebuilt them with new seals and cleaned the pots and the grooves the seals go in. Luckily the pistons were spotless and didnt need replaced. Redid both masters with stock OEM parts. I rebuild carbs if your inclined to have them farmed out. We can discuss that via PMs if you like.

[chuck hahn]

Directly from the service manual...

Stock main is 95 and pilots are 15

[bomber737]

Well thats good news I can use the good set of carbs I have. Thank you for your offer to clean them but I can get them cleaned. Its my zen time. Kids in bed and I sit in the basement and clean carbs. I have a 80 GS1000 with no title so I am not sure what I will be doing with that but I guess I can use the forks if I want to put a dual disk set up on it. I do like the stock look and I might just keep this bike stock. I was just concerned that the single disk setup might be to anemic to slow down a bike this heavy.

[Big T]

The brake does work pretty well

You can change to a CBR 900 or 600 rotor and a single caliper from a GS 500 for an upgrade in braking power. With a bracket, of course

[bomber737]

I was reading a few posts of guys upgrading their front brakes. I think I am going to run it stock for now and see what I like. Who knows, perhaps just stainless lines and drill the rotor and I will stop there. I will be getting the bike in the next 2 weeks so I will have pictures then. Hopefully the engine problems will not be so bad. I have to get it soon, I go to training on Oct 8th and I wont be home for 2 months.

[bomber737]

I have another question, is everyone running the dyna ignition on these 78/79's? I was thinking of replacing the points. I have not dealt with points before so this might sound dumb but is there anything besides the points I will need to replace when I make the switch?
Some of the eBay kits come with new coils so I was going to replace those as well. It says I need 3 ohm coils to run the dyna ignition.

[Steve]

You don't NEED 3 ohm coils, but they will perform a bit better.

Stock coils are about 5 ohms. The 3 ohm coils have lower resistance, meaning that more current can flow through them. More current = stronger spark.

The reason for the 5 ohm coils with points is to limit the current that is going through the points. Every time the points open, there is a small arc. (The condensors are supposed to keep that in-check.) Electronic ignition is designed to handle higher current, so you can use the 3 ohm coils safely. The 5 ohm coils will still work, though. There will not be as much performance improvement (just the lower maintenance), but they will work just fine.

.

[Big T]

The Dyna S is the ignition to have.

Skip Ebay and buy one directly from Dyna, so you know what you're getting

You can change the coils later, if you want

[bomber737]

I looked at the dyna ignition and that's what I will prob go with. I was wondering if there was an alternative out there for the dyna. I have a 78 cb750 and I have a electronic ignition installed on it that uses the points for timing but the points no longer have to brake to make a spark. The ignition is wired in series in the system. I like this system because if it fails I can just disconnect it and reconnect the points and continue down the road. Is there a system available for the GS like this?

[Big T]

I've never seen such a system for the GS

My Dyna S is only 30 years old, with no failure

Buy it, set it and forget it