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1980 GS1000 restomod

  • Thread starter Thread starter Guest
  • Start date Start date
Welp, the online and local machine shops think that one-off CNC machined aluminum spacers are worth their weight in gold, so another solution must be obtained.

The stock K6 GSXR 750 sprocket side spacer is M28x39x17. I need a M28x39x29 spacer. If a machinist turns down a spare M28x39x17 stock spacer by 5mm in length, then I should be able to stack the stock and modified spacers next to each other to get the spacing needed. Thanks to Salty_Monk for the discussion on this topic offline.

Shoot me a private message, I might be able to help you out. 👍
 
Need some opinions please on cosmetics:


  • Black out the forks? The gold forks don't jive with the rest of the bike IMO. Considering having them reanodized black.
  • Install the side covers? The Yoshimura GS1000 racebike (one of the inspirations for this build) didn't have them, but I'm leaning toward reinstalling them to give the bike a more "finished" look.

w4VWMJv.jpg
 
I recently purchased a small lathe and could whittle you out a spacer if you haven't found someone else to do it. PM me as needed.
 
From the sounds of it you are going for a resto-mod look. I prefer the look with side covers in place.
If it was a lightweight cafe theme ditch the covers and show off the empty spaces.

If there is no other gold on the bike, black out the forks.
What wheels are you using?
 
From the sounds of it you are going for a resto-mod look. I prefer the look with side covers in place.
If it was a lightweight cafe theme ditch the covers and show off the empty spaces.

If there is no other gold on the bike, black out the forks.
What wheels are you using?

Using the wheels shown: black 3 spoke GSXR wheels from a 2004 GSXR 1000 in the front and 2006 GSXR 750 on the rear.
 
Adios 2019 riding season...what's this cold, wet, white stuff on the ground this morning? :confused:

I think we skipped fall this year. Supposed to get down to 10 degrees F on Tuesday night and then 13 degrees F on Wednesday night.

Just means wrenching season is ramping up though... :D

gwRzMWL.jpg
 
If it was me.... I'd put the covers on, source a gold link chain, make sure the rear caliper matched & run the gold Suzuki case badges. :)

The gold forks highlight it for what it is for me.. A restomod.
 
Cosmetics

Cosmetics

Here's a quick mockup in Photoshop (I'm no PS expert, go easy :D) of the new blue/white color scheme including the side panels and blacking out the forks. I tried including the gold forks but it's still just too bling blingy with the gold. I may black out the front calipers as well.

The tail is still off the bike but will be included in the finished product with a fender eliminator. Thoughts?

uIbna5G.jpg


Before:

WyxQiYX.jpg
 
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3D printing

3D printing

A friend was kind enough to turn my CAD drawing for the sprocket side spacer needed for proper chain/wheel alignment into a prototype 3D printed plastic spacer. I can use this spacer to mock things up before getting the spacer machined from metal.

Making a spacer on the 3D printer:

OOL0zrX.jpg


A couple of spacers almost done:

AbL8dnN.jpg


Spacer installed in the sprocket carrier for testing. Also picked up a new rear sprocket, front offset sprocket and new chain.

vAf1mlD.jpg


Chain alignment looks good with this prototype spacer:

5hAT8K7.jpg
 
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Spacer if finished, heading to the post office at noon. Hopefully you get it Saturday. 👍
 
A bit of minor surgery was begun tonight to extract the rear K5/K6 GSXR 1000 shock from the swingarm and frame.

KAVNHmD.jpg


For better handling and to account for combined rider/bike weight, the plan is to replace the too-soft 8.1 kg/mm stock shock spring with a more appropriate 9.8 kg/mm Racetech rear spring. The rear shock will be serviced too with fresh oil and nitrogen.

The Racetech shock springs look trick in blue:

YHETuhH.jpg

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Storm 64 came through with a very nicely machined 7075-T6 sprocket side spacer per my specs. Much appreciated! Can't wait to try it out once I can reassemble the rear suspension when the rear shock comes back from the shop for service/respringing.

Left to right - 3D printed spacer, storm 64's spacer, and the stock Suzuki spacer.

IYky0yM.jpg
 
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The rear shock was serviced with new seals, oil, and nitrogen. A 9.8 kg/mm Eibach shock spring was installed to match the rider/bike combined weight and reduce squat when accelerating out of corners.

i9CMON5.jpg


The shock has been reinstalled, along with a new DID ERV3 520 pitch chain, a 520 pitch 17 tooth 5/8" offset front PBI Sprockets front sprocket, a Vortex (made here in Utah :)) 48 tooth rear 520 sprocket, and a new to me 2006 GSXR 750 rear wheel sporting a Bridgestone S21 180/55/17 tire.

5NOi7Av.jpg


Sprocket/chain alignment appear to be good with the custom spacer provided by Storm 64.

7XLFSpr.jpg


To improve engine warm-up time and to keep oil temperature consistent while using an oil cooler, a 215 degree oil thermostat has been installed with Earl's fittings.

MH8QcTs.jpg
 
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Nice.. I like the idea of the thermostat on the cooler :)

After some test riding this summer with the oil cooler shown, I think the thermostat is a requirement since overcooling the oil is just as harmful as overheating the oil.

It took ages for the oil temp to crack the 200 degree mark while using the cooler without a thermostat. Hoping the thermostat will get the oil into the operating temperature range much faster.

With the cooler, the peak oil temperature with this engine was around 240 degrees when stopped in traffic and cruising oil temperatures were in the 210-230 degree range.
 
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