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Old 02-15-2009, 04:13 PM   #1
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T5.5K Fossa: A /5 Dirtbike Project

Haha- I just wrote and deleted about 10 openings to this... Cant quite get any one that expresses my feeling properly, but HOLY CRAP I just took delivery of a little bit of a dream:




I have held off on doing any more than mentioning it in very passing circumstances, because in my line of work, nothing is a guarantee until you are on the bus on the way to the gig, and even then you never know, but now the thing is in my garage, and its MINE MINE MINE ALL MINE AHHHAAHHHHHHAHAHH

ok.




I have not had my hands on it before this. Have not built one iota of it with my own hands. Merely contributed some theoretical design elements.




We are looking at a 1972 R60/5 with Honda CR250 41mm forks.





I can not WAIT to ride it around.

It needs a battery,some electrics, footpegs, cut and weld the foot control levers, and fenders. I have a tank, but it needs paint. Well, it doesnt REALLY need paint, but it does need petcocks, and paint would be nice.

Actually I've got a ton of stuff to do to it before I start racing it in some local stuff, and I cant wait to hear what you guys have to say.






Lots of details, but I think it weighs about 300lbs.





HOLY CRAP we got some work to do, but OH MAN Its going to be worth it.


LETS RIDE
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Old 02-15-2009, 04:15 PM   #2
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your life just keeps making me more jealous every day

....I'll be keeping an eye on this one !
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Old 02-15-2009, 04:40 PM   #3
datchew
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you need to have another kid so you're slowed down to my pace.

+1 on the jealousy thing.

And you'll need some air filters. And we need wheelie pics!
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Old 02-15-2009, 05:04 PM   #4
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email sent. Thought it appears there were mods done to the brake part.
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Old 02-15-2009, 06:18 PM   #5
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I've already added my insider 2 cents other than it needs high-pipes as well. Now get to work I'm bored sitting here mending my ankle.

Love ya, Grimmy
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Old 02-15-2009, 06:30 PM   #6
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I am impressed! This should be a fun one for sure!

More pics of everything. Keep us updated, I am interested to see how this one turns out.
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Old 02-15-2009, 08:51 PM   #7
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Cool- sweet, thanks guys..

Oh Hey- maybe perhaps a mad could add "/5 Dirtbike" to the title, to make it so possibly you know what the hell this is about?

Here's the link to the smugmug site:
http://jasona.smugmug.com/gallery/7261322_e8gkG#P-1-12

and here's more photos for the less inspired:










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Old 02-15-2009, 09:15 PM   #8
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Now I understand the dead loss battery post better.
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Old 02-16-2009, 08:31 AM   #9
SUVslayer
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Looks like fun! Can't wait for the first ride report.
Looks like you need some duct tape for that seat.
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Old 02-16-2009, 11:41 AM   #10
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What kind of suspension travel do you expect to have when it's in racing trim?

What mods make that driveline angle possible?

Is that a cruise control (throttle lock) bolt on the throttle assembly? (That should come in really handy while waving to the crowds on your victory laps.)

We await a competition comparison between this /5 dirtbike and the African Desert F800GS.

(Now I understand the porno shot in the Friday photo thread, finally.)
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Old 02-16-2009, 07:39 PM   #11
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Oh man that thing is crying for a Baja Designs 8" Racelight
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Old 02-17-2009, 09:47 PM   #12
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OK, its at the welder friend of mine's getting some footeg action. Meanwhile lets talk about stuff I'm not ready to do yet.

http://www.advrider.com/forums/showthread.php?t=433393

Frank's right, I need to meter it to see what the ignition draw really is, then size a battery to handle my needs. Handle My Needs. I have needs.


SO whats it gonna take to fit a magneto to this thing? Has anybody ever bothered to do such a thing? I'm not too familiar with magneto's, (or, you may have already noticed, ANYTHING I do here) but am attempting to educate myself.


OK, also- I am hoping to arrange my brake lever to do somehting like this:




Here's an HPN solution:
http://www.hpn.de/bilder/high_resolu...days_gs_r1.jpg

Current unit is a hacked off aluminum stock. Was going to run it underneath, but now having looked a little closer I want it over the footpeg.

Also, you can see how HPN uses an armature for the shift lever, while I am planning on trying a foreshortened shift lever. Just a little stubby.




In that Sixdays shot, above, it looks like they've made the bash plate into the oil pan! clearance?

Cool airbox thought process, and I see the crankcasevent.

Fuel Lines are RIGHT NEXT to exhaust.


This guy has his swingarm gussets going aft, an interesting feature.

http://www.vintagejerry.com/JaysBMWdirtbike.htm

that exhaust is making me cry



Brake Lever: ala HPN:
http://www.hpn.de/bilder/high_resolution/baja85-2.jpg


http://www.hpn.de/bilder/high_resolu...is-dakar86.jpg


And also from looking at these, my footpeg placement looks like it generally lines up with where these are landing, just forward of where the frame goes vertical. It seems like I'm aiming to have my heels tap the pivot covers.

Next installment: exhausts. Maybe. I've got an R80ST stock muffler that would be nice and quiet (for my woods) but weighs a metric ton. I want to think of something that is relatively quiet and not going to get destroyed every time I hit a rock.





There doesnt seem to be an obvious nice easy cheap good solution waiting to beat me over the head with its simplicity. Dammit.



Its going to be interesting getting up and around the shocks. Its gonna seem like its sticking way out there... I'
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Old 02-17-2009, 10:05 PM   #13
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Quote:
Originally Posted by Cordless
What kind of suspension travel do you expect to have when it's in racing trim?

What mods make that driveline angle possible?

Is that a cruise control (throttle lock) bolt on the throttle assembly? (That should come in really handy while waving to the crowds on your victory laps.)

We await a competition comparison between this /5 dirtbike and the African Desert F800GS.

(Now I understand the porno shot in the Friday photo thread, finally.)

I dunno how much travel, exactly. I would be lying if I took a guess, but when I sat on it it was really plush. I will try to figure that out later.
I'm thinking I have to remove the shock springs so I can move the shock/rear wheel by hand to get an accurate measurement. What I'll most likely do is eyeball a tape measure while sitting on it and not.

There is a small notch in the rear frame brace just above the swingarm to let it go down just a little further. It shouldnt see any time at max lower extention, because that would presume I am getting the back tire off the ground. Most of the tie it will have at least my weight or some fraction thereof to keep it in line. Shocks should prevent it from going outside the shaft's limits. THe notch was plated with flat stock, so there is no gap, and its whole again.




It is a throttle lock, i think, because its from a modified /5 perch. victory lap- you make me laugh


I'll give you a sneak preview early comparison:

I would not kick the 800 out of my garage, but this one makes me salivate, and make little love noises
unconsciously.



I need to make sure the kickstart can clear the footpeg.

Nachtflug pointed out there is a guy selling a sweet R90 dirtbike over in the Flea Market. It looks like a really cool bike.
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Old 02-19-2009, 03:04 PM   #14
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So nice project !
keep us posted
Instead of magneto, why note using a moped unit (electronic and no need of accumulator), or a huskvarna enduro unit ? , you maybe have to deal with thhe spark timing, but some of them had a timing curve
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Old 02-19-2009, 06:50 PM   #15
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Quote:
Originally Posted by Caddy82rats
So nice project !
keep us posted
Instead of magneto, why note using a moped unit (electronic and no need of accumulator), or a huskvarna enduro unit ? , you maybe have to deal with thhe spark timing, but some of them had a timing curve

Thanks for that info... can you tell me more, before I just start googling toute fou?

I found out the rear diff is a 37/11. Could be lower, but its on the low side so its not bad.
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