'80 KZ750 Twin - Project:WARHORSE

my94f2

New Member
Re: '80 KZ750 Twin - Project: <yet to be named>

not to burst your bubble but make sure you have a rubber line in there somewhere for the flex. as for the line bend it, polish it and clear coat it
 

dp9

Member
Re: '80 KZ750 Twin - Project: <yet to be named>

yeah, im probably gonna do a lil rubber line on each end so it doesnt crack in a month.


also, recommendations for project names are welcome. we're kinda stuck. looking for something slightly offensive maybe?
 

dp9

Member
Re: '80 KZ750 Twin - Project: <yet to be named>

finally got some more work done on the bike. some parts came in too.

Black drag bars that dont fit in the bar clamps are here, and so is a gsxr steering damper. The bars have a 1" knurled portion in the middle and the clamps are for 7/8" bars so there is some space. I'll fix it somehow, I just dont know how yet. I think they look a little short/narrow on this bike, but my friend who I'm building the bike for says he likes them. we'll see how they look when its all together.

Tonight I cut the exhaust to approximately where its going to terminate, and removed the rear pegs as well. I do have to clean up the exhaust cuts with something. thinking about using a big pipe cutter (like a tubing cutter but for 2"-6" pipe) because i have access to one and it would be clean. Had my friend, soulgrindnj (i think thats his user name, he just signed up), sit on it to see how short I can cut the rear of the frame. First he has to decide what type tail he wants (if any). I also mounted the electronics up under the seat (not pictured).

I also got a lead on a set of mag wheels and a set of spoke wheels, so I'm just going to replace these sparkling pieces of iron oxide with something better entirely. Its his decision as to which ones, from a style standpoint.

some pics from soulgrind's fitting:




 

dp9

Member
Re: '80 KZ750 Twin - Project: <yet to be named>

Tore the carbs down. One of the slides has a dark spot on the plastic and its slightly misshapen. This slide also sticks. It takes some effort to free it initially, but then it slides ok in the carb. What are your guys thoughts on this? should i look for a replacement, or try to manipulate it to fit better?

 

reelinfeele

New Member
Re: '80 KZ750 Twin - Project: <yet to be named>

polish and clean the bore it rides in. WD40 will last only for a little while. the dark spot is probably the part that faces the engine. no big deal.
 

dp9

Member
Re: '80 KZ750 Twin - Project: <yet to be named>

Alright, its been a while since ive turned a wrench on this project. (Ive been working on this instead: http://www.yotatech.com/f198/dp9s-85-x-cab-build-project-fat-man-219025/)


finally got it torn down the rest of the way.



Soulgrindnj made some decisions today. He decided to use a different pair of bars, which i dont have a pic of (fail). They're regular bars with a 1" rise, flipped upside down. They look pretty aggressive.


He decided to use the tail section from my bike (since im changing it). It'll be easy to do the back end now because it already has lights mounted to it.



He also decided the name of the project should include "bomber". you guys got any thoughts? im still blanking on a name.
 

RedPlastic

make it rain bitches
Re: '80 KZ750 Twin - Project: <yet to be named>

nice x cab project...the last one i did got tons, sbc on pane, duals, back halfed, caged and 47" ltb's...now ive got an 87 sas'd runner, and an 84 single cab, thats getting back halved 4 linked with fox 2.0's
 

dp9

Member
Re: '80 KZ750 Twin - Project: <yet to be named>

oh god dont tell me those things! i was reading about a bolt in 4-link kit for it and now i want to.. No No NO! its almost done. not another full on project. just stick to the plan. I have to keep telling myself that.


but yeah, great little trucks. I love 'em. cant wait to drive it.
 

dp9

Member
Re: '80 KZ750 Twin - Project: <yet to be named>

doing some rust removal tonight. Using the electrolysis method. I used rebar linked together with copper wire and baking soda because i couldnt find washing soda.



Ive read that this process is actually line-of-sight, so I figured id surround the part with rebar. I know it looks tight in there, but its not touching the part.



after a couple minutes I have bubbles. Sweet. first time doing this. I like it already.



If anybody knows, is black oxide a rust protectant or do i actually have to clean the parts afterwards and coat them with something?

Update: Its not working so well.. or im just really impatient (my money is on the latter of the two). Here are my thoughts on what some possible problems could be.
-bad connection btwn the copper wire and the rebar.
Solution: wire wheel the rebar

-dirty rebar not having enough exposed clean surface area.
Solution: wire wheel the rebar

-Battery charger not having enough power.
Solution: buy a welder? I'm not really sure what I can do if this is the case.

-Copper not wrapped tight enough to make a good connection.
Solution: wire wheel rebar and re-wrap copper wire with more "windings."

Thats all I can think of. I'm going to let it sit as is over night and see how it looks in the morning.
 

my94f2

New Member
Re: '80 KZ750 Twin - Project: <yet to be named>

it takes several days yes. and like anything electrical a clean connection always helps
 

dp9

Member
Re: '80 KZ750 Twin - Project: <yet to be named>

figured out why its not really working. my batt charger is shot.
 

dp9

Member
Re: '80 KZ750 Twin - Project: <yet to be named>

played with dangerous chemicals today. Put a hot oxalic acid solution in the tank and soaked the rest of the rusty bits in phosphoric acid. No pics because I was too busy being careful with the chemicals, and because i didnt want to damage my camera phone. not sure how long i can leave that stuff soaking, but I'm going to do it overnight probably. I'll check on it in an hour or two to see what the progress looks like.
 

dp9

Member
Re: '80 KZ750 Twin - Project: <yet to be named>

checked the parts this morning, phosphoric acid FTW! everything in there is rust free. It didnt take the paint off or screw up any rubber that was on the parts! Although I may be jumping to conclusions saying FTW as I cant actually see into the tank. The Oxalic acid solution I made is rather cloudy and I dont want to dump the whole thing out just to check it. I tied a blue nitrile glove around the petcock bung to seal it up. I didnt really expect that to work, but its still there and hasnt leaked at all. man, i cant get over how good the parts look after this bath. Paint should arrive by wednesday or thursday. hmm.... i wonder if i can just dip the frame in this stuff... how much does a 55gal drum go for? laugh.
 

dp9

Member
Re: '80 KZ750 Twin - Project: <yet to be named>

yup, same stuff I bought. Ive heard it two ways: I read somewhere that the phosphoric acid creates a rust barrier of some chemical compound that coats the metal and you dont have to do anything. On the other hand, I also read, as you stated, that I have about a half hour after the part is removed from acid to coat it or it will flash rust. I'm not sure which is true, and I dont intend to find out. For the chassis parts, Ive got a gallon of denatured alcohol, a soap and water bath, a heat gun, and cans of self-etching primer all lined up and ready to go. For the tank, I've got the alcohol, soap and water, heat gun, a quart of MEK, and a can of POR-15 tank sealer. Did I miss anything? I'll see if I can have soulgrindnj take some pics while I'm doing this stuff at a feverish pace.


anybody know if you can soak rubber in phosphoric acid? I want to de-rust some rims without taking the tires off. is that as bad of an idea as i think it is?
 

dp9

Member
Re: '80 KZ750 Twin - Project: <yet to be named>

aaaaaaaaand... you were right, red. I swear if i had 10 seconds before it started to flash rust, it was a lot. threw the parts pack in the phosphoric acid for a couple hours and it all came off. that time I was ready for it. a quick dip in denatured alcohol, hit the part with the heat gun until it was dry (seconds per side), spray it with primer on both sides, touch it up later. kinda a pain in the balls. The parts didnt rust until after I took the acid off though. maybe I'll see how long it takes to rust if I just leave it out. I still have some more parts to do, but here's the first chance I had to snap a shot of the ones I did.



The tank didnt come out so well. I didnt want to spend $60 to fill it with phosphoric acid, so i spent $10 to fill it with an oxalic acid and water solution. I'm gonna say it was a waste of $10. I mean, it kinda worked, in one area. It cut down on the rust that was there, but it didnt come close to what the phosphoric acid did. The powder didnt completely dissolve in the solution, or it precipitated out. either way I had oxalic mud on the bottom of the tank. It worked ok in that area (side wall of first pic), and didnt do much in the rest of the thing.




Ok, 3 more gallons of phosphoric acid, then I can coat the tank.
 

RedPlastic

make it rain bitches
Re: '80 KZ750 Twin - Project: <yet to be named>

you can mix h20 with the phosporic acid and let it soak for a day or so, and it'll come out just fine. If you dont want to buy 3 gallons of the stuff.

edit...iirc...I used half a gallon of that stuff in my gs tank, and added h20 till I filled it up the rest of the way.
 

yinchinzhong

New Member
Re: '80 KZ750 Twin - Project: <yet to be named>

im in for this build! i just got a 80 kz750 twin also!

btw you have a pm sir :)
 

dp9

Member
Re: '80 KZ750 Twin - Project: <yet to be named>

wasnt sure if I could do that. thanks for the tip, Red.


Glad you're enjoying the build. The real progress should be coming soon. Im pretty tired of this cleaning business, time to get to some modifying and parts fitting.
 
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