Those are both not bikes I've ever seen … but I am also shooting for a 9 degree rake. Else a springer is a joke, you can buy an Injun made one for $330 or so, mod it a bit and viola.
https://www.ebay.com/itm/TRIUMPH-3HW-3SW-WWII-350CC-FRONT-END-GIRDER-FORKS-CH...

Its actually worth asking those guys a few questions and seeing what they've done with the stem, what dia the axle is (which is likely decipherable from the model they sell it for.
In any case, the rake is what's gonna require the engineering, and the fact that I would take trail to near 0 making it handle light and low effort - far far lower than a stock savage if you were to do like my dirt bike FE of 10 yrs ago.
Cool.
Srinath.

Trail should on a raked out bike should be low - well under the 3".
The wheel base gonna determine your turning radius and how nimble it actually is.
The rake which would get close to 45 degrees will also make for a slow steering bike.
Trail should be low, else the effort to steer would be ridiculous not to mention raking it at the neck vs raking with triples has its own set of math.
You remember about my KX125 fork fitted bike right. It had 9 degrees of rake all at the triple. he ride height was almost unchanged from stock. If I had the forks fitted the right way - with the axle leading - the bike handled like crap.
Flip the legs left to right and the axle trailing instant heaven. It felt lighter to steer than a stock savage, in also was quicker off the line and oddly I thought it just was better in every way compared to a savage - handling, braking, acceleration etc etc etc.
Now the front end contribution is mainly the fact that while it added almost a foot to the wheel base and 9+ to the rake it also turned a small negative trail from the right way to a small positive trail by flipping, a 21" aluminum wheel spins slower at any speed than the stock 19 and its narrower, lighter by a lot (aluminum vs steel) and the best part was due to the kinetic energy of rotation dependent on square of the rpm, cutting the rpm by 20% gives you a 44%+ reduction in RKE.

The rear end was lightened by tossing the fender, rear seat sissy bar etc etc etc as well as that boat anchor of a muffler and the carrier bracket was cut to just the minimum required to slap the exhaust can. Instant nirvana - just from that, but the handling is where the front end shines.

The trail for a non raked @ the triple with 3" - 6" would work. Obviously a lot of jap bikes are built around those numbers. But the raking at the triple is an entirely new animal.
That's why I keep saying 9 degrees, dirt bike front end flip the legs 1000's of times.
If you've ridden a virago 535 or even a vulcan 750 or a Yamaha 700 maxim etc etc you'd see a bike with an extra 100 lb or so handles with such lighter effort than the savage.
The savage is light and has low CG and you'd think 5.8 trail would make it light handling, except that offset in the triples is killer. That's one reason it has such high effort to steer compared to anything even much heavier. Rake it an added 9+ stretch it a foot and nowhere near 5.8 would be rideable. Stuff like the seeger kit - I have to look into it maybe it makes the trail near 0 but running a dirt bike FE the right way will get you negative trail.

Actually let me build my FE and I'll send y'all an invite to come and ride it - Near Columbia SC. When you're this way you're welcome to come by.

I actually have some guys who I'm talking to about building it as a custom item - you buy a dirt FE and send me the fork diameter and the c/c distance and I'll cut plates with 9 degree rake. Sort of like a mail in custom service. Lets see how it works out for the prototype.

Below is the bike I did 10+ yrs ago, and sadly it was rear ended on the first ride (almost) I sepnt 3 months going to chiropractor every week and I sold that bike within days of the accident cos I was just not having happy thoughts about it.

Cool.
Srinath.

I've been emailing those guys, asking them for a detailed upper triple drawing, and if they're thick enough to mig weld or has to be tig welded cos we need a brake bracket and some other general info like that, and promptly they reply saying - get this - It will cost $1600.
OK then, sounds great, lets order 100 and - No I don't think so.
I'll first start with the raked out mail order triples made to fit dirt bike forks.
Lets see if the guys want to mess with my bike standing in their shop - apparently there is an entire gaggle of welders, machinists, fabricators and none of em rides a motorcycle. I think I've found the only pack of 50-60 metal smiths who don't ride a bike like WTFFFFFFFFFFFF.

Cool.
Srinath.

ohiomoto wrote on 06/22/20 at 16:15:00:





And they dont have any people skill either.
Cool.
Srinath.

IIRC yamaha bearings were 25 and 28mm Suzuki like the savage was 25 30. You may be able to get the 55 OD needed in a 28ID lower and slap that in there and the stock upper would work.
The basic idea is upper is 25 id 47 OD, lower is 30 X 55. 189mm free stem length. If you can ream that lower triple 2mm OD you can put the savage stem in there.
Oh a stock HD is 1" - may be the 25mm upper will fit it but you can just sleeve the lower to 30 mm. Its 2 mins for a machinist even if you had to shave the upper 1" to 25mm. Then you could just use a HD wheel/disk set.

Remember the legs of that springer will clobber the stock tank. So you'd need to change that.
But you may end up with a much better handling bike, even the stock rake springer FE looks long and like it will leave your offset much smaller than the savage has right as it is, making for a low trail.

Try it and post back. The biggest issue I was facing was that I am trying to rake it just with the front end. I need to design it etc etc and no one wants to make it looks like.

Cool.
Srinath.

To an earlier point, many of Sugar Bear's springers had 0 trail. And handled beautifully. Kinda hard to get my head around. But then, given the severe rake and weight of those bikes, you'd want to do all you could to avoid the potential for "flop" I suppose.

This was a nightmare - same bike, forks wheel etc - just installed the right way around.
Cool.
Srinath.