Mole28 Posted December 10, 2017 Author Share Posted December 10, 2017 The last one in the pics is my main race bike. It's a GSXR750F that has a few mods and the 2nd pic is of my SRAD600 that I haven't raced this year. The other two are bikes I have recently bought as spares for the Slabby and possibly a wet bike. Quote Link to comment
Mole28 Posted December 11, 2017 Author Share Posted December 11, 2017 Here is a list of mods on my Slabby race bike: Frame braced at headstock with 8mm alloy plates, 40mmx20mm box behind head stock and at top rear of cradle, modified subframe, 600K1 front end with ZX9R wheel, PFM discs(awesome), 1100M rear wheel(heavy but easy fit.I intent to change to SRAD600 as I have a few of them sitting around). Engine: 750M crank cases,lightened crank,Race clutch plates, steels and springs,Wiseco high comp 771cc kit, 750F ported and skimmed head, Kent cams, Yoshi big bore 4-2-1 with random can, Dyna 2000 ignition and coils, Mikuni RS34s, APE alternator blank, Race cases. Bodywork: 750F tank and the rest is Slingy aftermarket race stuff from Ricambi-Weiss( cos its much cheaper than the Slabby fairings and I crash a fair bit). Lots of other bits that are non standard as well but I can't think of them just now. 5 Quote Link to comment
dupersunc Posted December 11, 2017 Share Posted December 11, 2017 Nice. Where do you race Mole? Quote Link to comment
Mole28 Posted December 11, 2017 Author Share Posted December 11, 2017 Scotland only so far. Knockhill and mainly East Fortune in the Post Classic senior class on the Slabby and Pre injection 600 on the SRAD. I'm going to do the Donnington classic endurance and Spa classic next year. That's the plan anyway. 1 Quote Link to comment
dupersunc Posted December 11, 2017 Share Posted December 11, 2017 Have to noticed any difference with the frame bracing? Trying to decided if I go down that route with my slabbie race bike. Quote Link to comment
Mole28 Posted December 11, 2017 Author Share Posted December 11, 2017 I braced it before I started racing so don't know if there was a difference. It handles sweet though. Ground clearance is my main issue. I had to cut away the fairing at the cases but now I'm decking out the engine cases. I'm told I will just have to hang off more. Quote Link to comment
dupersunc Posted December 11, 2017 Share Posted December 11, 2017 Yeah I had to do the sides of the fairing on mine. I run a yoshi style fairing which is very slim. Do you get a hopping or weaving from the front end when you really load it up. Quote Link to comment
Mole28 Posted December 12, 2017 Author Share Posted December 12, 2017 Not at all. It feels well planted and I'm really hard on the brakes. Quote Link to comment
Mole28 Posted December 12, 2017 Author Share Posted December 12, 2017 Dupersunc, I've just realised you are the guy I bought the 1052 bottom end off recently and that you have a 1052 clutch basket in the free stuff section. Do you still have it or did you include it in the parts you gave me? Quote Link to comment
dupersunc Posted December 12, 2017 Share Posted December 12, 2017 Hi Mole, You have the clutch basket I had. Duncan. Quote Link to comment
Mole28 Posted December 12, 2017 Author Share Posted December 12, 2017 Ok, cheers Duncan. I'm collecting as many 1052 bits as I can just now for Spa Slabby project Quote Link to comment
Mar71n Posted December 12, 2017 Share Posted December 12, 2017 On 12/10/2017 at 1:59 PM, Mole28 said: R logo`ed engine covers 2 Quote Link to comment
canamant Posted December 31, 2017 Share Posted December 31, 2017 On 12/11/2017 at 10:13 PM, dupersunc said: Have to noticed any difference with the frame bracing? Trying to decided if I go down that route with my slabbie race bike. I've got 2 750 slabby race bikes neither of which have any addtional bracing. They have both lapped the TT course at just shy of 100mph. CregNyBaa averaged over 100mph when he finished 3rd in the 2010 Classic Superbike Manx GP on an unbraced slabby 750. I've no idea whether you could go faster on a braced version but I'm in no doubt that I was the limiting factor not the frame. Personally I would not brace the frame anyway. It's designed so that the stresses go where they go and the frame can deal with it. Brace it up and put more load through it and who knows where the extra load will go. It will find the next weakest point which may not be able to cope. Snapped frame at the bottom of Barregarroo anyone ? Quote Link to comment
dupersunc Posted December 31, 2017 Share Posted December 31, 2017 (edited) 10 hours ago, canamant said: I've got 2 750 slabby race bikes neither of which have any addtional bracing. They have both lapped the TT course at just shy of 100mph. CregNyBaa averaged over 100mph when he finished 3rd in the 2010 Classic Superbike Manx GP on an unbraced slabby 750. I've no idea whether you could go faster on a braced version but I'm in no doubt that I was the limiting factor not the frame. Personally I would not brace the frame anyway. It's designed so that the stresses go where they go and the frame can deal with it. Brace it up and put more load through it and who knows where the extra load will go. It will find the next weakest point which may not be able to cope. Snapped frame at the bottom of Barregarroo anyone ? I was of the same opinion as you, plus most of the bracing I've seen on slabbies is either ott or inefficient. I have now got to the stage where I'm having issues with the performance of the chassis, specifically on entry to apex of quick corners, When the front tyre is heavily loaded. I can't be sure but it feels like the frame is flexing allowing the front tyre to hop sideways across the track. It's quite violent though doesn't feel like the front will let go completey. I've spent some time this winter making sure all the engine mounts and spacers are good transition fits. My next thought is solid front mounts and cylinder head brace like the late 750 wr and ws had. Totally agree with you on moving stress else where on the frame. I'm not going to be racing on the isle though, and my frame is raw alloy so it can be easily inspected and repaired . Edited December 31, 2017 by dupersunc Quote Link to comment
yann7/11r Posted December 31, 2017 Share Posted December 31, 2017 Motor power, swingarm, fork, suspension... can surely alter the sense also. Quote Link to comment
markfoggy Posted December 31, 2017 Share Posted December 31, 2017 2 hours ago, dupersunc said: I was of the same opinion as you, plus most of the bracing I've seen on slabbies is either ott or inefficient. I have now got to the stage where I'm having issues with the performance of the chassis, specifically on entry to apex of quick corners, When the front tyre is heavily loaded. I can't be sure but it feels like the frame is flexing allowing the front tyre to hop sideways across the track. It's quite violent though doesn't feel like the front will let go completey. I've spent some time this winter making sure all the engine mounts and spacers are good transition fits. My next thought is solid front mounts and cylinder head brace like the late 750 wr and ws had. Totally agree with you on moving stress else where on the frame. I'm not going to be racing on the isle though, and my frame is raw alloy so it can be easily inspected and repaired . Very valid points. My guess would be that in a roads/real world application...best left alone, the bike probably needs a degree of flex to feel complete and trustworthy. Yoshi may have been chasing around the frame with a welder and using an inexhaustible supply of spare frames to cut up, but they were on the cutting edge of the tyre technology and working circuits. Possibly even breaking frames. Mayhap the limit of the chassis design has been found by the tyres. Tyres have moved on a lot since those days, it may well be a case of damage limitation. Dunc, I would do exactly what you're doing. Finesse it to the n'th degree. You've found the limit, if you want laptimes...time to look somewhere else. 1 Quote Link to comment
dupersunc Posted December 31, 2017 Share Posted December 31, 2017 Yeah, tyres have very much surpassd the chassis. Time to go for something more modern.... .... now gathering parts to build a Slingshot race bike. Quote Link to comment
markfoggy Posted December 31, 2017 Share Posted December 31, 2017 As it goes I was thinking about maybe finding the times on different parts of the circuit. Must be more to come from the corner exit if you have not found a limit there. Oh! Just an idea,.... Is the front wheel starting to move about? That is not a description that I've heard before ! Quote Link to comment
MeanBean49 Posted January 1, 2018 Share Posted January 1, 2018 On 31/12/2017 at 1:15 PM, dupersunc said: Yeah, tyres have very much surpassd the chassis. Time to go for something more modern.... .... now gathering parts to build a Slingshot race bike. Not a great deal better at all really. Slingshots are in all honesty not great frames. Can be braced up a fair bit but then they weigh a ton. Not cheap but good aftermarket frame is the best option Quote Link to comment
dupersunc Posted January 1, 2018 Share Posted January 1, 2018 4 hours ago, MeanBean49 said: Not a great deal better at all really. Slingshots are in all honesty not great frames. Can be braced up a fair bit but then they weigh a ton. Not cheap but good aftermarket frame is the best option Yeah I know. An ex wsb racer I know raced a very trick 1216cc 750rk at snettterton around 10 years ago. He reported similar issues to what I'm having. Slingshot frame is already heavier. It all points to the fundamental architecture of Oil cooled frames being wrong for modern tyres. But I've got the parts to build 7/12 slingshot race bike so I'll see how they compare. After market frames aren't on the radar unless someone has a Motomartin or Harris F1 frame the want to sell me for £500. That said i have got a decent frame jig I built a few years back.... 1 Quote Link to comment
markfoggy Posted January 1, 2018 Share Posted January 1, 2018 Ok, interesing. Maybe the regs that dictate some of this period shit actually work!!! This becomes a much bigger debate, but one that is actually important. Quote Link to comment
MeanBean49 Posted January 1, 2018 Share Posted January 1, 2018 (edited) 2 hours ago, dupersunc said: Yeah I know. An ex wsb racer I know raced a very trick 1216cc 750rk at snettterton around 10 years ago. He reported similar issues to what I'm having. Slingshot frame is already heavier. It all points to the fundamental architecture of Oil cooled frames being wrong for modern tyres. But I've got the parts to build 7/12 slingshot race bike so I'll see how they compare. After market frames aren't on the radar unless someone has a Motomartin or Harris F1 frame the want to sell me for £500. That said i have got a decent frame jig I built a few years back.... I suppose the other good thing is slingshot frames are cheap enough to experiment with. I think the problem with slabbies and slingshots is they are just too narrow. No matter what you do bracing wise its not going to do a great deal to stop the headstock twisting. Bit like pitching a tent. If you peg it down close its not as stable as if you get the guide ropes out a decent way. Ideally top tubes need widening and securing on the cylinder head. Edited January 1, 2018 by MeanBean49 1 Quote Link to comment
markfoggy Posted January 1, 2018 Share Posted January 1, 2018 Oh, if only they had come up with something like an SRAD..... 1 Quote Link to comment
MeanBean49 Posted January 2, 2018 Share Posted January 2, 2018 (edited) 9 hours ago, markfoggy said: Oh, if only they had come up with something like an SRAD..... Constructive as usual and relevant as usual. Edited January 2, 2018 by MeanBean49 Quote Link to comment
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