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View Full Version : customizing the frame on an 80 gs 850



Turxx
11-28-2012, 06:39 AM
so i got an 80 gs 850 and the frame from same in case im so far off i need to start over
what im going for more is lines then anything, i know what i want it to look like
i lowered the forks a few inches, just so the suspension will bottom out without the wheel hitting
im putting cone filters on and getting rid of the air box
im going to modify the tank a little to make better lines
the biggest change is im opening up the rear wheel
i cut all the tubing off past the swing arm pivot and am planning a mono shock
now i understand theres geometry involved, but like i said at the beginning, im after lines
what im going to do is reinforce the plate in front of the wheel and mount my shock to that and then up to a mount point near where the tank bolts down
my question is to those who have tackled similar projects
if im not especially concerned with the amount of travel i get, so ling as its shy of being a hard tail. are there any critical flaws in my plan?

Turxx
11-28-2012, 07:02 AM
theres one other question, when building the exhaust, id like to bring it out both sides, the stock exhaust has a cross over running the center 2 together, is removing that going to cause problems? most people i see go 4 into 1... pros and cons to that?
any other relevant info on exhaust?
also, carbs, how hard are they to rejet so the bike runs right with the cone filters and a freer flowing exhaust?

RedneckMedic
11-28-2012, 10:56 AM
Post up an intro and be sure to include pictures and then it sounds like you need to make friends with junkyard. and as always :nopicsbs:

junkyardjon
11-28-2012, 12:40 PM
i just got home from the doctor's & gotta get to work. i'll reply when i get home. you can have lines and make it work. jetting is easy.

junkyardjon
11-28-2012, 07:14 PM
exhaust, 4-2 will work fine. reason factories use 4-1 is the best power combo. i hope you run some baffles at least ! open pipes get old fast unless it's a parking lot cruiser... jetting will be the very last thing to mess with which isn't hard, just a little time in fine tuning. cone filters kinda suck because of the cross wind & suck too much air, but there are ways to minimize it. little shields on the inside of the filter and you'll be good to go. most pods can be bought at the auto parts store but don't telling anybody that, they like paying more from a motorcycle place.... unless you buy the real cheap one's from ebay.

i need a pic of what you did to the swingarm. you can have form & function but i need pic's.

Gas Man
11-28-2012, 10:56 PM
Welcome!

Turxx
12-01-2012, 03:50 PM
1964196319651966

i still need to add the mounting brackets, ill hold off on that till i find the shock im going to use

junkyardjon
12-01-2012, 05:44 PM
i don't see a problem there. i was worried you cut the right side of the arm off, wasn't sure from your post lol. what size shock are you looking for? i have a few laying around from sport bikes which i'd guess your gonna run. what city you from?

Turxx
12-01-2012, 06:51 PM
im in st cloud mn, 13-14 inch would be ideal and the smaller diameter the better

Turxx
12-01-2012, 07:03 PM
i may need a tank too, i cut mine in half to modify it a little, that seems to have been a bad idea, im gunna try brazing it before i give up on it, i just need to go buy brazing rods, but my little lincoln cant seem to find a balance between burning through and penetrating nice
doh

junkyardjon
12-01-2012, 08:15 PM
im in st cloud mn, 13-14 inch would be ideal and the smaller diameter the better
the sport bike shocks i have are shorter than that. maybe clean up one of your old one's and use that. granted the spring rate will be way off but it should do for look's or... use a sport bike shock and extend the mount's a little....

Gas Man
12-01-2012, 09:07 PM
Jon will be your guy for stuff like this... he's very good at this.

Turxx
12-02-2012, 01:40 PM
well i could sure weld up a longer mounting bracket for a shorter shock, i cant use the old ones, i threw then in the box of a pickup i scrapped with a buch of other junk i didnt figure to use for anything

Turxx
12-02-2012, 01:41 PM
wheres some good reference material for building a muffler, youre right i dont want just straight pipes but i would like to keep them short with a small diameter

junkyardjon
12-02-2012, 05:42 PM
not sure on that, i run home made baffles. just exhaust reducers with pipe added for length, hole's drilled in it, wrapped in fiberglass matting. take's the high pitch out and leave's a nice tone.

never throw anything out into your done !!! rule #1 lol

Gas Man
12-02-2012, 10:44 PM
I really would think for you Jon it would be never throw anything out,it might be used in the next bike.

junkyardjon
12-02-2012, 10:48 PM
and thats part of my problem LOL

Nobody
12-05-2012, 12:26 AM
well i could sure weld up a longer mounting bracket for a shorter shock, i cant use the old ones, i threw then in the box of a pickup i scrapped with a buch of other junk i didnt figure to use for anything






Tip: Get in touch with your inner pack-rat. Never toss a part out unless it is seriously munched and only good for a paper weight.

It might get used on the next bike, a future re-work of the old one, or might save a friend a few bones on thier build.