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TOPIC: 1981 gpz1100 project resto-mod

1981 gpz1100 project resto-mod 27 May 2015 22:30 #674119

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I pulled the trigger on buying a set of 1987 gsxr1100 wheels and supporting hardware for a wheel upgrade. I also ordered a set of flat slide 34 mm mikunis. I'm not sure yet if I need to upgrade the swing arm yet but that's on the table. Has anybody used these wheels before? I'll be upgrading the brakes as well. No photos because I don't have them all yet.

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1981 gpz1100 project resto-mod 27 May 2015 23:40 #674125

  • davido
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As I understand it,If you want a fatter back wheel,youre going to need a wider swingarm. On my build I use a gsxr600 swingarm (direct fit)
and a Bandit600 wheel,with a 160 tyre.
A gsxr1100 wheel would have a 180 tyre (?), I dont see how thats going to fit in a standard swingarm. Also,chain run has to be thunk about,and if you want to have the wheel centered,the sprocket carrier is probably going to hit on the arm.(Though a lot of people reckon you can run a back wheel off center,I find that a very weird idea !.)

Good luck

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1981 gpz1100 project resto-mod 28 May 2015 06:36 #674156

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can't wait to see what you do.

keep us posted,

leon
skiatook,oklahoma 1980 z1r,1978 kz 1000 z1r x 3,
1976 kz 900 x 3
i make what i can,and save the rest!

billybiltit.blogspot.com/

www.kzrider.com/forum/5-chassis/325862-triple-tree-custom-work

kzrider.com/forum/5-chassis/294594-frame-bracing?limitstart=0

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Re:1981 gpz1100 project resto-mod 28 May 2015 09:39 #674183

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Double check the rim sizes on the Gsxr. I think they may be 18's and the tire options are somewhat limited.

I've done a few suspension swaps. I can tell you first hand to research, research, and do more research before handing over cash for the parts.

Later, Doug
1978 z1000 Streetfighter
1976 z900 Stripfighter (work in progress)
1983 Gpz750 Resto-Mod
1989 Vmax

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Re:1981 gpz1100 project resto-mod 28 May 2015 10:13 #674191

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+1.
I bought 3 wheels before I found the right fit!

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Re:1981 gpz1100 project resto-mod 28 May 2015 22:09 #674316

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StreetfighterKz wrote: Double check the rim sizes on the Gsxr. I think they may be 18's and the tire options are somewhat limited.

I've done a few suspension swaps. I can tell you first hand to research, research, and do more research before handing over cash for the parts.

Later, Doug


I've done a few myself and have a lathe and mill so I can modify what I need- hopefully

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Re:1981 gpz1100 project resto-mod 29 May 2015 09:18 #674350

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StreetfighterKz wrote: Double check the rim sizes on the Gsxr. I think they may be 18's and the tire options are somewhat limited.

I've done a few suspension swaps. I can tell you first hand to research, research, and do more research before handing over cash for the parts.

Later, Doug


I've been scoping this out for a while. I purposefully went with the 18" rims to maintain ride hight, this keeps me from having to Mickey mouse a suspension riser solution and keep the set of ZRX rear shocks I bought for it. Also the front fork width is just about dead nuts the same width as the Gixxr forks, so the front wheel should clear. The stock width for these rims is rear 150/70 (4") and front 110/80. If I have to change the rear swing arm, I think I'd go with a ZRX one.

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1981 gpz1100 project resto-mod 29 May 2015 09:44 #674353

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I forgot to mention, I have my complete EFI system for sale. I have most of it on ebay, but if someone on this forum wants it, I'll make you a smoking deal. I have two -1003 control units, and two fuel pumps.

I also have a set of 34 mm CV carbs off a 80's police version that came with the bike as well for sale.

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1981 gpz1100 project resto-mod 29 May 2015 10:22 #674360

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What do you want for the EFi?

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1981 gpz1100 project resto-mod 29 May 2015 12:33 #674392

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baldy110 wrote: What do you want for the EFi?


With both control units and pumps. $400.00

With one control and pump. $300.00

Too give you an idea, I paid $100.00 apiece for the control units, $80.00 for the pumps, $75.00 for the pump switch, $25.00 filter etc...

It even comes with a K&N air filter for the stock air box, you can't even buy those anymore I think.

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1981 gpz1100 project resto-mod 02 Jun 2015 10:01 #674981

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Ugh, still waiting on my stupid expensive racing carbs...from Z1 Enterprises.

Still waiting on my gixxer wheels.

So, I started back on my 1981 GPZ550 project. Details:

Paid $200.00 for it. Barely running, and lawn furniture speckled gray and silver textured paint on every part he could reach. It also had a nice dent in the tank as well.

I've taken it to the bare frame, stripped and cleaned every nut, bolt and part. Order over $600.00 in new OEM hardware, stripped and resprayed every part to original specs. I still need to rebuild the forks, powder coat the frame and swing arm, and re-assemble the top end of the engine. I was going to put the 615 kit in, but it was just too expensive, so I purchased a low mile <<, 1000 miles($25.00), cylinder block off a zephyr 550, honed and re-ringed the existing pistons. I purchased a horrible old kerker 4 into 1, that has to be blasted and repainted, and some filter pods. The real challenge has been getting the hardware, so many of the screws and nuts are buggered and rusted. I'm also still seeking a in tank fuel level sending unit. It's the round base type.
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1981 gpz1100 project resto-mod 02 Jun 2015 17:36 #675036

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My Gixxer wheels arrived, check it out. The rear bolts right up like I thought it would!!

Yeah! :woohoo:


There will be some work with the brake mount, but nothing too bad, I had to do the same on a old VFR.
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1981 gpz1100 project resto-mod 02 Jun 2015 17:50 #675039

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looks great. What size tire?
Jon
1977 KZ1000a1
Mesa, AZ
Phoenix Fighter Project

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1981 gpz1100 project resto-mod 03 Jun 2015 08:44 #675113

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kaw-a-holic wrote: looks great. What size tire?


Thanks, the rear is 18x150x70, the rim is 4" wide, so it can take up to a 170 but that's too wide for the swing arm. The 150 clears by about 5mm per side at the standard rearward position. The brake arm also clears, by about 2mm. I might move or bend it slightly to get a little more clearance. Stock rear brake will not work, so I'm going to get a rear 87 gixxer brake.

The front is more challenging. The tire and wheel clear with the stock forks, however, the rotors just touch the forks. They are about 6mm too wide. I had the same problem on my 86 VFR when I converted it to CBR600 F2 wheels. So I have to mill down the rotor mounts on the wheels 6mm per side. Its a bitch to do, but it has to be done. Might have to ditch the old console too for a Koso. No great loss, that thing is big and ugly anyhow.

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1981 gpz1100 project resto-mod 17 Jul 2015 09:55 #681353

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Update, I've added a set of GSXR1100 front forks and triple clamps to over come the width issue with the front wheel. I'm not sure I'll stick with these, I might ditch them and use a set of cbr600 F3 forks that I have and just use the triples off the GSXR. I also have to convert to a 530 chain, which ok, Z1 has a kit to do it. My 34mm flat slides are finally on their way, after three months waiting....

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1981 gpz1100 project resto-mod 25 Aug 2015 23:13 #687154

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*Nice projects. Where did you get the 50 body parts?

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1981 gpz1100 project resto-mod 28 Aug 2015 12:09 #687494

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mjg15 wrote: *Nice projects. Where did you get the 50 body parts?


Not sure what you mean. Most of the bits are from the bikes, just stripped off.

Oh, if you mean the 550 mostly ebay, and some from steels cycle salvage.

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1981 gpz1100 project resto-mod 28 Aug 2015 18:00 #687538

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Yup, meant 550, sorry about the typo, I didn't catch it. Nice job on the respray.

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1981 gpz1100 project resto-mod 04 Sep 2015 08:04 #688608

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mjg15 wrote: Yup, meant 550, sorry about the typo, I didn't catch it. Nice job on the respray.


Thanks, I was going to have it sprayed by a "pro" and they wanted $1200.00 holy crap! I'm pretty good with the color, was going to have the clear done at a shop, but they wanted $700.00 just for that. So, I decided to do the whole thing myself, built a booth, bought the equipment, read some books, practiced, and did it.

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1981 gpz1100 project resto-mod - update pics 04 Sep 2015 12:39 #688653

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I'm making progress on the wheel conversion. Front wheel engineered, brake extension templates made, just need to mill them out.
I did have to ditch the stock console (its for sale cheap), the electronic sending unit at the wheel was way too big to the mill down and make fit. So I got a 87 GSXR mechanical speedo drive&cable, that I was able to mill down enough, and the cable matches perfectly to a 1984 Zn1100 LTD instrument cluster. The cluster also mounts right to the triple clamp along with the warning light brackets from the same 84 ZN1100. I had to mill and turn the spacers to fit, and mill the wheel brake mounting points down about 6 mm and re-tap. I used a ridged mounted dial meter to true the disk rotors. The 86 750 front wheel uses a 15mm axle the 87 1100 17 mm, either work fine with the stock GPZ axle. I did have to mill the GPZ nuts down a little. With the front wheel now 18" and wider, I dropped the fender down 3/4" with new mounting holes drilled. I modified the swing arm slightly to allow more clearance for the new fatter 150 rear tire. It actually gave me enough room to mount a 160 conformably, but I'm sticking with a 150 for now. The best thing about this wheel swap is the ability to run radials, they are so much better than the bias ply. I'm using a 87 GSXR rear brake and mounting hardware, the swing arm needs a bracket welded on the bottom for the brake torque arm. I bought a set of Zephyr 1100 rear shocks for it, that I am having Jamie Daughtery of DMS www.daughertymotorsports.com/ Rebuild and modify. When he is done with them they will out perform Ohlins, at a far better price point. Chain is now a 530, with a front sprocket from Z1 Ent. Front forks will get a set of Raceteck Gold Valve emulators and upgraded springs. Also added a fork brace and steering dampener.

FINALLY received my lovely Mikuni RS34-D21-K flat slide Carbs, test fitted them yesterday, perfect fit. They are beautiful. I'm still debating whether or not to fit some race cams to boost the power up a bit (or in my case recover power from altitude loss).

What I still need, desperately, is the in tank fuel level sending unit. This is the round base type.

I have parts for sale too:
All for a 1981 GPZ1100 B1 with 3600 miles on it.
rear brake
MAF unit
2 (two) EFI controllers computers
EFI air box
Speedometer/Console, like new
Tripmeter/Odometer with just 3600 miles on it. <<< what the bike has, original miles.
Right hand mirror
Front wheel with rotors
rear wheel with rotor & sprocket <<< with original factory tire!
Original chain <<< 3600 miles on it

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Last edit: by 577nitro. Reason: photos
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