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March 9th, 2017, 02:15 PM   #1
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Frame modifications!!

Just got my frame back from powdercoating after some srtrategic strengthening/bracing. Extra cross brace under sump, extra bit of webbing between the 2 frame rails (near exhaust headers), webbing and mount points beefed up at swingarm pivot, extra bracing around headstock.









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March 9th, 2017, 04:17 PM   #2
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needed?

Hello Bludge. Just looked over your pics. Can`t help wondering why a beefy Husaberg frame needs any bracing. It already is cro-mo tubing that doesn't fatigue, with a load dispersing design that doesn't have unwanted flex. You may find your bike has lost a bit of leaned-over tracking ability. The finish you got is superb though. Was there enough light in the welding shop? Although plenty strong, the welds look inconsistent. How do I know you ask? A career repairing and making parts for everything from 100 ton tank cars to suspension bits for RC racers, leaves one with a terrible burden of judgemental knowledge.
Even a stock Husaberg fame, with the massive WP forks, is a bit too stiff for really fast flat-track type sliding. Of course, for "normal" brutal off roading / crashing it`s about right. By the way, did you know the earlier rectangle cross section swingarm tracks better leaned over than the stronger, prettier tapered one? Yes in all the racing Husaberg did there wasn't that much flat-tracking to do. Having looked into that rear engine case breaking issue, make darn sure your swing arm pivot shaft is tight enough. Those twisting loads had better be sent into the frame, not the fragile aluminum cases. Kawasaki has some nice small axle nuts that sure work better on the pivot rod than the light flat OE nuts. Spot of lock-tite please. Good luck, L
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March 9th, 2017, 11:16 PM   #3
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I believe bludgeon has pretty much copied the factory race frame I have sat here.

at least he's out there meddling and fettling! long may it continue!

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March 10th, 2017, 12:00 AM   #4
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If you look closely at this pic, the extra bracing talked about is on this frame too.

I'm assuming it's for Supermoto, where the extra grip from slicks may put extra stresses on the frame. I know Lazzarini rode a factory supported 700cc that had the steering head braced as well.

Damo


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March 10th, 2017, 12:01 AM   #5
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All in the name of supermoto racing!
Yes Taffy, I basically copied everything I have seen/found about this. All of these modifications were done (probably better!) to Christian Iddons Berg back in the day - and many others besides. Turns out he was fairly fast!

Interesting to hear your thoughts LV. I wasn't too fussed about the look of the welding - told the guy it was function over form in this case! I spoke to Dave Clarke about these mods - apparently the beefed up swingarm pivot mod made a big difference getting the power down exiting corners (according to Christian). They're all tried/tested modifications in supermoto. The only one I couldn't do was Lazzarini's! Only because I haven't got twin pipes/headers, I'll add a pic below in case you've never seen it. I must say I'm not aware of the rear engine case breaking issue, I'll look that up. If you happen to know which Kawasaki axle nuts to look for, i'd appreciate it.

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March 10th, 2017, 12:09 AM   #6
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That's the one BLUDGEONER,

What a weapon, apparently run a 19T front sprocket too!

Still the best tank decals too that of the 2003 model.....

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March 10th, 2017, 12:11 AM   #7
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Yeah - I remember reading something about that. I think the swingarm needed modifying to run that 19T!
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March 10th, 2017, 12:18 AM   #8
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Nice Bludge. I have a set of cases here that have a substantial welded repair at the swingarm mount, the steel insert is actually loose in the recess! This was from sidecar abuse.
The 1988 Rgv chassis I use has a plain rectangle swingarm, the later models had a very trick looking ''banana' arm which was heavier and flexed more!
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March 10th, 2017, 12:27 AM   #9
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Originally Posted by BLUDGEONER View Post
Yeah - I remember reading something about that. I think the swingarm needed modifying to run that 19T!

Yes I'm sure your right mate. There had to, there's not much room there even with a 15T!

So, regarding the twin exhaust, you know what you have to do!

Do you run in a Supermono class canolman? Your RGV with Husa power? That would be cool!

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March 10th, 2017, 12:45 AM   #10
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when I raced Ducati F2s back in the day, the gearing was so high that they had to change the clutch basket and primary gear to bring the teeth back to normal. this reduced the speed of the gearbox by 10 rear teeth. shame husaberg didn't do that. I find 19T difficult to believe. 16T is what i use and this is on the road. on the track you couldn't possibly have a reason for 19T except chain wear or anti-squat. even then it is illogical.

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