kochic Posted May 31, 2020 Posted May 31, 2020 Hi, I'm building again my old GS1000.This time to be a vintage P3 superbike. I build a frame jig for this project. Its a slow project, I will post pics of progress. Marc 12 Quote
smithy09 Posted June 6, 2020 Posted June 6, 2020 Love the jig. I might build one myself!! Are you changing the steering head angle? The rear geometry change is a good one. I guess you copied Pop's dimensions from the period? I did the same on my race bike and it works well. You have to move the lower shock position as well, but it works. I reckon you went over the top on bracing. In my experience it's just not required and simply adds weight. When I get my bike back together, that's what I will concentrate on; weight reduction. Nice work though mate. I look forward to seeing progress! 3 Quote
smithy09 Posted June 6, 2020 Posted June 6, 2020 What engine and running gear you going to use? Progress photos as you go please! Quote
kochic Posted June 6, 2020 Author Posted June 6, 2020 Thanks, yes I will move back and steeper the steering tube.The shocks are YSS rg362 and the bottom mounts will be moved too.I plan on using a Katana 1100 swingarm for a period look.I' m waiting AP calipers from Harris. For the front end, i plan to use sv650 lower with cbr600 upper in , in old style adjustable yokes(if I can find a set).With adjustable yokes I will be able to switch back and forth between 17'' and 18''. The frame was done mostly looking at old pictures and website like here.Its a mix of gusset plate, 16g, and tubes, again 16g.Top shocks mount are 14G.I probably removed more weight on the stock frame.I should have weighted it before I started to modify it... I made aluminum new engine mounting plates, rearset are in the making. Like a fool I sold all my GS1000 go fast parts years ago.Right now the engine is a GS1000 bottom end with a gs1100GK top end.I still have a ported head with oversize valves.I will sort out the frame and after that the engine. Quote
smithy09 Posted June 7, 2020 Posted June 7, 2020 I like the weight saving on the mounts. I might have to take that route as well... I agree on the Katana swingarm. Easily strong enough, and you can always brace it a bit. Something I would also like to do is make a fibreglass mould of the seat and tail fin and make a one piece fibreglass seat along the lines of the Katana versions on offer. That and either an alloy or fibreglass tank. I want to keep the bike looking like a GS thou though, not a bitsa. The current engine managed 150 rear wheel hp which is enough for me. If you want any engine photos, let me know, as I went through quite a few versions before I got it right! Twin plugs makes a much nicer engine, cooler as well. Easy mod. Hardest work were the cam chain mods, same as Yosh did in the period. Anyway, I watch what you are doing with interest! Very nice job! Quote
kochic Posted June 7, 2020 Author Posted June 7, 2020 Thanks, 17 hours ago, smithy09 said: I like the weight saving on the mounts. I might have to take that route as well... I agree on the Katana swingarm. Easily strong enough, and you can always brace it a bit. Something I would also like to do is make a fibreglass mould of the seat and tail fin and make a one piece fibreglass seat along the lines of the Katana versions on offer. That and either an alloy or fibreglass tank. I want to keep the bike looking like a GS thou though, not a bitsa. The current engine managed 150 rear wheel hp which is enough for me. If you want any engine photos, let me know, as I went through quite a few versions before I got it right! Twin plugs makes a much nicer engine, cooler as well. Easy mod. Hardest work were the cam chain mods, same as Yosh did in the period. Anyway, I watch what you are doing with interest! Very nice job! Thanks, Yes, I will really appreciate it.If my memory is good, I remember your build on the old forum.My last gs1000 engine had CR, under buckt, wiseco 1100 pistons, cam motion cams with titanium hardware, 40mm and 33mm valves.Sold it for peanuts. I will start from zero with another engine.I'm not sure if I will use a GK D port heat or a small port head.When the rolling chassis is sorted it will be engine time. I think there is a version that use the breather cover for the cam chain mod. The fiberglass seat is a good idea.Over here 40year agoo,you had to use the stock seat pan on a superbike. Quote
smithy09 Posted June 8, 2020 Posted June 8, 2020 Here are the pistons I used. They were custom made by Wiseco to fit the Combustion chamber and valves I was using (Can't remember exact sizes of valves). I had to re-sleeve the block and bore the cases slightly. My head was sourced from the states and was a small port but well ported by Buzz from Dynoman. I fitted the Yoshi style cam tensioner system to control cam chain issues. Seemed to work OK. I hear you on selling parts for peanuts! You kick yourself right? That sounds like it was a good engine. I'm so glad I didn't sell my race bike when I stopped racing in 2009, and I'm looking forward to rebuilding it! I wish I could find a decent crank for it. Mine is welded with Carrillo rods, but not balanced or polished.. Anyway, some details of my old set up are attached. I hope this helps. Damn. Found I can't attach PDFs or drawings. If you PM me your email address I'll send all the info I have. The Wiseco Pistons no is BTO-1923M07800. These will fit a small port combustion chamber. You should be able to order off that number if you wanted to. 78mm and 1220cc roughly. I have a heap more detail that I did for Yoshi Johnny when he was building his bike. Just let me know if there is any detail you want and I will do my best to help. Sorry for the thread hijack. I am really keen to see your bike progress and what you do, especially the steering head mods! 3 Quote
kochic Posted November 29, 2020 Author Posted November 29, 2020 I know its been a long time but I was able to work on the frame last week.Rake is now 26 degree, stock is 28.The bracing is done. Marc 2 Quote
kochic Posted November 29, 2020 Author Posted November 29, 2020 (edited) Next step is the swingarm. Marc Edited November 29, 2020 by kochic 6 Quote
kochic Posted May 31, 2021 Author Posted May 31, 2021 very slow progress, at least on two wheels now. Marc 6 Quote
Kp93 Posted May 31, 2021 Posted May 31, 2021 Just red this post made for a good read! Like the progress so far. Wish I was capable of all this engineering how did you apply two plugs per cylinder smithy09? Quote
Builtwithpurehate Posted December 10 Posted December 10 Super old but has anyone seen anymore on this engine rebuild? Quote
Reinhoud Posted Thursday at 12:20 PM Posted Thursday at 12:20 PM (edited) This topic got me curious... I measured the rake of my GS1000, and I measured 22 degrees, I measured it in different ways, same result very time.. All I changed is a shorter front fork (2006 GSXR600) and raised the back a little.. And it still doesn't handle like a GSXR Edited Thursday at 12:21 PM by Reinhoud Quote
TonyGee Posted Thursday at 02:33 PM Posted Thursday at 02:33 PM 2 hours ago, Reinhoud said: This topic got me curious... I measured the rake of my GS1000, and I measured 22 degrees, I measured it in different ways, same result very time.. All I changed is a shorter front fork (2006 GSXR600) and raised the back a little.. And it still doesn't handle like a GSXR LOL Quote
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