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Dpratt07
03-27-2015, 1:33 PM
Hey guys, Im Dave a new guy to the forum. A little background for you, I'm 26, work in the operating engineers local 132. Im a proficient tig welder and a more than proficient mechanic with hot rods and turbo applications. Big fan of drinking beer and talking shop. My dad used to tig custom bike frames in Wyoming when he wasnt busy as a boilermaker. Hence where I get the drive for fabrication, welding and bikes.

The bike.

I traded a 320 dollar Walther .380 for this bastard of a bike. It did not have a clean title which took me 2 years to settle out. It did not run, and actually still doesnt for the most part. It also was the ugliest bike i have came across. But I was younger, broke, and in desperate need for being on a bike. So I took it on. Ive collectively owned it for 5 years now and have yet to ride it. Yeah, I know. You would think in that time period I would have figured this none sense out. But I had other projects, as well as starting a new career to occupy me for the most part.

It is an 84 Gs550L that the guy claimed to be a 650, but I'm nearly positive he was full of shit. The A/F screw caps on the carbs hadnt even been pulled to access the adjustment. Im no Sherlock Holmes but lets get real here.....

This is what it looked like when I got it.

http://i60.tinypic.com/10pwthy.jpg

I know, it gives you that "Holy shit that's ugly" thought in the back of your mind.

So I began to chop, paint, weld, rewire, and fab going with a design I had in my mind.


First of all, I despised that big goofy seat. So I pulled it and chopped off the ass end that extends out to hold the rear fender and all that stuff. Then I made a seat from looking at a design on the internet on how to mount it. From there I made a simple cross brace to attach the pivot point of the seat

http://i57.tinypic.com/s67ghz.jpg


http://i62.tinypic.com/whmkb9.jpg

I just used the stock rear fender, chopping it almost in half then welded some cool little legs to the swing arm that come up and hold the fender in place. Also ditched the center display and the tach.

Which puts the bike right about here..

http://i61.tinypic.com/micfwj.jpg

For a while I had my head firmly in my ass and didn't take as many pictures. Which sucks because there are two cool things that cant be shown in the fabrication stage. Though they are simple and self explanatory. I didnt like the display section at all on the bike. So i ditched it all excluding the speedo. Which I built the nifty little bracket that bolts to my riser and holds the gauge centered and low profile.

Next I welded a small bracket to the bottom of the back of the seat to attach my brake light. and license plate. However I plan to relocate the plate....again.

Then I got to thinking I may want to ride up to Chillicothe and I know that metal seat will be pure punishment so I added a simple pad to the seat and pop riveted deer hide over top it.

http://i61.tinypic.com/5ajgb5.jpg


At this point I only have pictures of how it sits today. Ive since replaced the magneto, and rectifier. Handle bars were replaced with drags and the headlight is one of those cheapos with the signals built in.

My issue at this point is the 4 inline Mikuni CV carbs. I am well aware that pod filters and a chopped exhaust is a disaster. But holy hell is the stock stuff hideous. I love the look of the bike now. I see quite a few GS 550 builds with pods and chopped mufflers.

Ive rebuilt them however one carb on each circuit is leaking fuel out of the filters. I can get it to sit and idle but meanwhile the fuel is just pouring. I think part of the issue is that I sourced some seedles from a honda something that were what i thought were almost identical. But I think maybe they are seating properly to those needles or maybe the seat is just worn out. So I am going to buy 4 new full rebuild kits from K&L and see how it goes.

From there I will try to restrict the pod filters with filter socks maybe and then do the lollipop washer trick to the exhaust for backpressure. Then pray that works.

If anyone has experience or has a setup like this with specific ideas or jet sizes i will need, I am all ears. Hope you enjoy the build.


http://i58.tinypic.com/zlwvas.jpg

http://i62.tinypic.com/2ugdv68.jpg

http://i62.tinypic.com/33y2v5w.jpg

http://i60.tinypic.com/15y9poz.jpg

http://i61.tinypic.com/2ecp0dw.jpg

loddytoddy
03-27-2015, 1:52 PM
the odd numbered (550/750) gs's are chain driven. the even numbered ones are shaft (650/850)

Dpratt07
03-27-2015, 2:11 PM
the odd numbered (550/750) gs's are chain driven. the even numbered ones are shaft (650/850)

Sorry i didnt clarifly, he said it was bored to a 650. Which is a ridiculous thing to say when looking at the bike.

loddytoddy
03-27-2015, 3:52 PM
Could have done a top end from a 650 maybe.

Pendulum
03-27-2015, 6:29 PM
Could have done a top end from a 650 maybe.

Yep. Somewhat common on these bikes. What year is this thing? Looks to be a 77-79. If so, take some good close-up pictures of the cylinders and head, and I'll compare it to my stock '79. I'm sure there's some external differences between the 550 and 650 top ends. I might be imagining this, but I feel like I've seen "549cc" stamped on my engine somewhere.

gs650
03-27-2015, 6:49 PM
Looks like a 550. The 650 has a wider cylinder that doesn't taper as much. As far as the carbs go, the issue is most likely the needle and seat not sealing. To get it to run right you will have to buy a jet kit. You need air bleed restrictors and different needles that come in the kit. I tried doing it without the kit. Look fir the dyno jet stage 3 kit. Here is a pic of mine, it's an 80 550L. It runs awesome now.
http://i285.photobucket.com/albums/ll73/svcamaro/gs550/20141211_173857.jpg

Westboundbiker
03-27-2015, 10:50 PM
the odd numbered (550/750) gs's are chain driven. the even numbered ones are shaft (650/850)

Not all evens!
The 450s are chain drive.

I really need to get an updated picture of mine... though right now its just a frame and parts as I wait for paint.

Dpratt07
03-28-2015, 5:36 AM
Looks like a 550. The 650 has a wider cylinder that doesn't taper as much. As far as the carbs go, the issue is most likely the needle and seat not sealing. To get it to run right you will have to buy a jet kit. You need air bleed restrictors and different needles that come in the kit. I tried doing it without the kit. Look fir the dyno jet stage 3 kit. Here is a pic of mine, it's an 80 550L. It runs awesome now.
http://i285.photobucket.com/albums/ll73/svcamaro/gs550/20141211_173857.jpg

Ahhh, i see. Thanks for the info man. I will definitely go ahead and order that stage 3 kit. You're gs looks killer !

Dpratt07
03-28-2015, 9:39 AM
Stage 3 Jet kit, motion pro throttle cable, and 4 full rebuild kits are now ordered.

Dpratt07
04-17-2015, 5:49 PM
Got it running, and running great ! I also did some clean up with the cutting wheel on the frame, removing the old ferring mounts and such. While I was at it I removed the rear shocks and rigid tailed it. roundstock and metal bushings to make the struts. Worked really well.

I took it for a ride today and noticed since i removed the shocks, in turns around 50 mph the rear feels like its making the bike dip side to side slightly or maybe like its slipping on the road a little. Freaked me out so I figured Id hop on here and see if anyone had some insight on that. My thought is its slipping with that old ass tire on there, and if im going to run hardtail i need a wicked sticky rear tire.

Am I close ?



either way the bike is running like a raped ape. Plugs were sooty but i had a hanging idle. First thought was those grubby ass intake boots. Took them off cleaned them up and put gasket shellac on them. Boom no more hanging idle. Oh and i leaned my mixture. Purs like a pissed off kitten.

Ill take a picture after bit of how it sits now.

thanks

Dave

Dpratt07
05-18-2015, 6:00 AM
Well everything engine wise is now sorted out, bike runs like a raped ape. Its agile and i love it. Slapped on some ape hangers and built some hard struts for the rear. To hell with paying a 100 bucks for them when i can make them.
Final jetting ended up being 115 outters and 117.5 inners. Plugs are caramel and the the throttle respose is right on point. Oh and i have one washer shimmed on the needles.

http://i59.tinypic.com/rj07cn.jpg

http://i57.tinypic.com/2wps86v.jpg
http://i59.tinypic.com/10ohh7t.jpg
http://i57.tinypic.com/2m5lbaf.jpg

Yeahhh i know what youre thinking, i put some orange lights under the tank haha. My girlfriend had the idea and she wanted to help do something on the bike so we had a nice day doing a little project and she learned some valuable wiring skill.

I also tooled out and dyed a new leather cover for my seat, i had never done this before but my grandad was pretty wicked at it and i inherited his mass of quality tools. I felt like i owed it to him to try my hand at it as well. I went out andbought some better padding too. My ass will apreciate it. Will install it maybe in the next couple days.

http://i60.tinypic.com/142x7hz.jpg
^ Oh and that mallet to the left is for the leather tools. Couldnt find the one he had so i lathed this one out of a hunk of zebra wood i had in the wood shop , then wiped it down with mink oil haha. Works great !

Hopefully i will have a video up at some point of the bike running. It runs great now and i couldnt be happier.

Whats left to do:

Ordered a new speedo that shows a shit load of info but is small and still sleek.

Ordered a new sprocket. Fucker is hard to hang onto down low, but at highway speeds im up a little too far in the rpm range. Im using a 49T now, dropping to a stock 45T.

Ordering new pressure plates for the clutch. First gear is dragging no matter how far i adjust it.

Tail light and signals are hard to see ive been told so i will most likely run something else a little more vintage bobber style.

I MAY recreate a new rear fender. Mine is fine butttt i have something cool in mind . But for this season its ride ready

Hope you enjoy !

Thanks for looking !
~ Dave

http://i62.tinypic.com/2quuno0.jpg
Yeah ^ thats Owen Shmidt of the Seahawks and WVU. Mountainfest bike rally 2014. Keep it tires down fellas.