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Author Topic: Ton up SR250 - a cafe racer by the numbers: 100mph, 100kg, 30hp  (Read 22564 times)

Offline JadusMotorcycleParts

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Re: Ton up SR250 - a cafe racer by the numbers: 100mph, 100kg, 30hp
« Reply #180 on: Nov 06, 2018, 03:38:43 »
So how are you going to measure success?
I have bought a few bikes, the Husaberg in particular, where the PO had wound up the preload, compression dampening and rebound to a point the bike was unsafe. It would spit you off at the first bump, no wonder he sold it so cheap! Backed it all off so the wheels could actually react and now it is beautiful bike to ride! It is much softer, but it does not bottom out and the wheels stay engaged with the track (except when airborne)  ;D.

I would say that not so many people would completely understand what they are adjusting when they adjust things on their suspension.  Most would just expect harder/softer rather than different damping settings.  Glad you got a good bike out of it though!

Offline JadusMotorcycleParts

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Re: Ton up SR250 - a cafe racer by the numbers: 100mph, 100kg, 30hp
« Reply #181 on: Nov 06, 2018, 04:05:35 »
Here's the first (well actually third after a couple failed attempts) prototype for the stock fork cap replacement.  This makes it a one man job to rebuild the forks and a much easier process - push the cap down with one hand with a tool guided in a pocket/recess in the cap (for this purpose - so the tool doesn't slip out), then once it is in the correct position, the other hand can clamp the circlip and let it sit into it's groove.

Then once it is in position, the cap lifts up and actually holds the circlip in its relaxed state - by the shape of the top machined detail.  So to release the circlip again, the cap needs to be pushed down a little to pass this detail - an extra safety/security feature (think I got this idea from one of you guys in an earlier response?).

I will experiment with the length of it now and see what I can do with interchangeable spacers. 

Oh yeah, the cap will also have a machined top, held in place with an oring - to keep the whole assembly water tight.

Offline 2Planks

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Re: Ton up SR250 - a cafe racer by the numbers: 100mph, 100kg, 30hp
« Reply #182 on: Nov 06, 2018, 10:34:32 »
YES! I just battled mine. Had to be the first time the forks have been apart. I slipped off the plug when putting it back together. Glad the piece didn't hit me. You're doing gods work Jadus
"I'd take years off my life, before life off my years"

Offline hooligan998

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Re: Ton up SR250 - a cafe racer by the numbers: 100mph, 100kg, 30hp
« Reply #183 on: Nov 07, 2018, 01:01:22 »
What is the material you're using and is it machined or 3D printed.  Pretty cool work.

Offline JadusMotorcycleParts

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Re: Ton up SR250 - a cafe racer by the numbers: 100mph, 100kg, 30hp
« Reply #184 on: Nov 07, 2018, 03:47:23 »
Thanks guys.

The plastic is PLA and the method is FDM from a Printrbot printer.  It is not the best printer but it works very well for my purposes  :)

Offline JadusMotorcycleParts

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Re: Ton up SR250 - a cafe racer by the numbers: 100mph, 100kg, 30hp
« Reply #185 on: Nov 08, 2018, 03:32:56 »
I finally got my custom copper head gaskets for this project as well.  0.5mm thick (and with a larger opening to fit the 77mm piston) giving 10.2:1 compression ratio.  I also took the chance to order another version for a boosted stock engine (with standard bore) at 1.5mm thick, giving 8.3:1 compression - good for 6-8psi of boost.

Yes, on the side I am working on a supercharged SR250 project...  It is going very slowly though and taking a back seat to this project.  Although I am finding there is a lot of nice cross over research and design work.

Offline advCo

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Re: Ton up SR250 - a cafe racer by the numbers: 100mph, 100kg, 30hp
« Reply #186 on: Nov 08, 2018, 10:15:39 »
Despite the fact that I haven't found an SR250 yet, I enjoy watching your prototyping and product design processes. Keep up the good work!
"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0 - Sold
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Offline 2Planks

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Re: Ton up SR250 - a cafe racer by the numbers: 100mph, 100kg, 30hp
« Reply #187 on: Nov 08, 2018, 12:28:13 »
Thanks guys.

The plastic is PLA and the method is FDM from a Printrbot printer.  It is not the best printer but it works very well for my purposes  :)

Question im going to be re gearing my exciter. Have you messed with different set ups?
"I'd take years off my life, before life off my years"

Offline Habanero52

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Re: Ton up SR250 - a cafe racer by the numbers: 100mph, 100kg, 30hp
« Reply #188 on: Nov 08, 2018, 19:12:16 »
I finally got my custom copper head gaskets for this project as well.  0.5mm thick (and with a larger opening to fit the 77mm piston) giving 10.2:1 compression ratio.  I also took the chance to order another version for a boosted stock engine (with standard bore) at 1.5mm thick, giving 8.3:1 compression - good for 6-8psi of boost.

Yes, on the side I am working on a supercharged SR250 project...  It is going very slowly though and taking a back seat to this project.  Although I am finding there is a lot of nice cross over research and design work.
Who made them for you?
Habanero52
Speed cost....How fast do you want to spend?
Follow the dream.
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Offline JadusMotorcycleParts

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Re: Ton up SR250 - a cafe racer by the numbers: 100mph, 100kg, 30hp
« Reply #189 on: Nov 09, 2018, 03:21:17 »
Despite the fact that I haven't found an SR250 yet, I enjoy watching your prototyping and product design processes. Keep up the good work!

Thanks man, love your CB build!