Welcome, Guest. Please Login or Register

Author Topic: The Gnarlster; HPN prototype in the making.  (Read 866 times)

0 Members and 1 Guest are viewing this topic.

Offline Dustdevil

The Gnarlster; HPN prototype in the making.
« on: November 11, 2017, 06:43:45 pm »
As many of you know, HPN have been the king of the airhead GS models. For many years I have maintained, that for the slight saving in cost of building a local frame it just simply did not justify the huge expense that usually goes with this kind build.
Lets face it; the HPN frame was in a league of its own and it was build to a standard that is almost unattainable by even some of the best builders out there like Gletter, Sheck and TAG.

Lately there have been a number of local guys that flanged together a couple of plates, most probable designed of of some pictures I have posted here on the Wild Dog forum showing some closeup detail of what it is that made the HPN frames so great.

Well I have had some of these frames in my hands and the work done on them were more akin to what one will find in a wrought iron shop than what can be expected from an engineering workshop that understood not only welding but also what is required to build a great motorcycle.
I will post some images of the frame in question so that I can highlight some of the mistakes sometime in the future.
I would also like to add that the costs for these inferior modifications were astronomical when compared to the cost of having HPN modify a frame.
I believe that some of these back yard welders used the HPN pricing as their guide without realizing the amount of work it takes to do it correctly. I will elaborate more later on.

The bottom line is that HPN's doors have practically closed to most except perhaps a few local customers, this as well as the ripping of by some local builders have prompted me to develop my own set of gussets and to weld it to an American frame that have been hanging of my roof trusses for a very long time.

I used a HPN frame to measure the gussets, this combined with my experience building a number of HPN models over the years, I believe have equipped me with enough knowledge to provide not only a few gussets welded to a frame but to supply a complete solution for the development of a functional rolling chassis which will have all areas covered like the swing arm, center and side stands as well as the subframe.

What will follow here is my story of building a GNARLY monster that might not even be allowed on regular roads. I want something that is both light and powerful, very basic with few additions like the ability to carry luggage racks and the usual paraphernalia. Small tank and no fairings.

Lets see where this road will lead.....
« Last Edit: Today at 11:25:47 am by Dustdevil »
 

Offline billy-joe

Re: The birth of a gnarlster. HPN copied in South Africa
« Reply #1 on: November 11, 2017, 07:14:48 pm »
Hi Altus

When you describe your bike, it sounds exactly like what I have in mind and have mentioned this to you during our chats so I canít wait to see how yours ends up. I also still need to make a plan to get my scoot to you somehow.

Really looking fwd to this.


Sent from my iPhone using Tapatalk
-There is no road to happiness...Happiness is the road.
-One cannot drink beer all day long if you do not start early in the morning says Welsh!!
 

Offline billy-joe

Re: The birth of a gnarlster. HPN copied in South Africa
« Reply #2 on: November 11, 2017, 07:18:09 pm »
Hi Altus

When you describe your bike, it sounds exactly like what I have in mind and have mentioned this to you during our chats so I canít wait to see how yours ends up. I also still need to make a plan to get my scoot to you somehow.

Really looking fwd to this.


Sent from my iPhone using Tapatalk


Something like this but not exactly!



Sent from my iPhone using Tapatalk
-There is no road to happiness...Happiness is the road.
-One cannot drink beer all day long if you do not start early in the morning says Welsh!!
 

Offline Dustdevil

Re: The birth of a gnarlster. HPN copied in South Africa
« Reply #3 on: November 11, 2017, 08:08:44 pm »
Hi Altus

When you describe your bike, it sounds exactly like what I have in mind and have mentioned this to you during our chats so I canít wait to see how yours ends up. I also still need to make a plan to get my scoot to you somehow.

Really looking fwd to this.


Sent from my iPhone using Tapatalk


Something like this but not exactly!



Sent from my iPhone using Tapatalk

Exactly that but with taller suspension  >:D
 

Offline 1ougat

  • The Commodore !!!
  • Senior Member
  • ***
  • Bike: BMW R1200GS HP2
    Location: Western Cape
  • Posts: 3,781
  • Thanked: 1 times
  • The Commodore
    • View Profile
Re: The birth of a gnarlster. HPN copied in South Africa
« Reply #4 on: November 11, 2017, 08:22:49 pm »
 :sip:
Make mine a Boxer with a shaft!!!!
2006 R1200 HP2 !!!! - La Poderosa - "The Mighty One"
1965 R50/2
1996 R80 GS PD Classic
2010 1200 GS 1975 Suzuki AC50
 

Offline Dustdevil

Re: The birth of a gnarlster. HPN copied in South Africa
« Reply #5 on: November 11, 2017, 08:29:08 pm »
This have been one of my all time dreams.
The frame was build from scratch and it has a special arrangement around the rear shock making it slightly unattainable with the standard BMW frame, but the end result must have strong resemblances.
The motor have been tilted in the frame and I am seriously considering this alternative.
« Last Edit: November 11, 2017, 08:29:35 pm by Dustdevil »
 

Offline billy-joe

Re: The birth of a gnarlster. HPN copied in South Africa
« Reply #6 on: November 11, 2017, 08:35:20 pm »
Hi Altus

When you describe your bike, it sounds exactly like what I have in mind and have mentioned this to you during our chats so I canít wait to see how yours ends up. I also still need to make a plan to get my scoot to you somehow.

Really looking fwd to this.


Sent from my iPhone using Tapatalk


Something like this but not exactly!



Sent from my iPhone using Tapatalk

Exactly that but with taller suspension  >:D


Iím too short  for anything taller than an HP2!


Sent from my iPhone using Tapatalk
-There is no road to happiness...Happiness is the road.
-One cannot drink beer all day long if you do not start early in the morning says Welsh!!
 

Offline gee

Re: The birth of a gnarlster. HPN copied in South Africa
« Reply #7 on: November 13, 2017, 08:04:47 pm »
Dustdevil came across this one about 2 months ago. the bloke said it was done by hpn in germany 2004. he still takes it up into Africa when he has contract work. Asked if he would sell but no luck
 

Offline Dustdevil

Re: The birth of a gnarlster. HPN copied in South Africa
« Reply #8 on: November 13, 2017, 10:52:21 pm »
Dustdevil came across this one about 2 months ago. the bloke said it was done by hpn in germany 2004. he still takes it up into Africa when he has contract work. Asked if he would sell but no luck

Next time you see him tell him he must bring it down to Middelburg so that I can wash it ::)
Great machine though, only the best :thumleft: :thumleft: :thumleft:
 

Offline Dustdevil

Re: The birth of a gnarlster. HPN copied in South Africa
« Reply #9 on: November 13, 2017, 10:56:22 pm »
Its happening :thumleft: :thumleft: :thumleft:
While it technically speaking might not be the first time I am welding a bike frame this will be the first time I am doing this specific kind of weld.
 

Offline pietas

  • Senior Member
  • ***
  • Bike: BMW R80GS
    Location: Western Cape
  • Posts: 1,068
  • Thanked: 5 times
  • Gryskop seuntjie
    • View Profile
Re: The birth of a gnarlster. HPN copied in South Africa
« Reply #10 on: November 14, 2017, 07:10:18 am »
Interessant. Ek sal bietjie dophou wat gebeur.   :thumleft:
Groot berge en lang grond paaie
 

Offline DirtRebell

Re: The birth of a gnarlster. HPN copied in South Africa
« Reply #11 on: November 14, 2017, 07:29:26 am »
Good to see you going again on it Altus.
This is going to get interesting.
 

Offline Noneking

  • Forum Whore
  • ****
  • Bike: BMW R1200GS HP2
    Location: Mpumalanga
  • Posts: 7,409
  • Thanked: 8 times
    • View Profile
Re: The birth of a gnarlster. HPN copied in South Africa
« Reply #12 on: November 14, 2017, 08:19:34 am »
Sub
BMW HP2 ENDURO - nr 497

2016 HUSQVARNA 701 ENDURO
 

Offline gser

  • Senior Member
  • ***
  • Bike: BMW R80GS
    Location: Gauteng
  • Posts: 2,250
  • Thanked: 2 times
  • Gelukkig nog nie hard GeSloeg nie
    • View Profile
Re: The birth of a gnarlster. HPN copied in South Africa
« Reply #13 on: November 14, 2017, 08:44:18 am »
 My recommendation , if I may  . . .
Take your project to Altus , let him turn it to a properly done one. Not only the frame , also motor, gearbox, fd, etc. . . .
Go and visit him in Middelburg and be convinced  . . .
It will be worth every cent and time spent .. .



 


 
The following users thanked this post: Dustdevil

Offline ROOI

  • Senior Member
  • ***
  • Bike: KTM 990 Adventure
    Location: Gauteng
  • Posts: 3,017
  • Thanked: 3 times
  • XR650R YZ 250 2t WR AKA Red Rider
    • View Profile
Re: The birth of a gnarlster. HPN copied in South Africa
« Reply #14 on: November 14, 2017, 09:16:19 am »
sub  :snorting:
FTS
 

Offline BMBob

  • Senior Member
  • ***
  • Bike: BMW R1200GS Adventure
    Location: Western Cape
  • Posts: 914
  • Thanked: 1 times
    • View Profile
Re: The birth of a gnarlster. HPN copied in South Africa
« Reply #15 on: November 14, 2017, 08:50:20 pm »
Sub
BMW R100S
BMW R1150GSA
BMW R1200GSA
BMW R1200S
BMW R80RT Mono
 

Offline Offshore

  • Senior Member
  • ***
  • Bike: KTM 990 Adventure
    Location: Western Cape
  • Posts: 2,655
  • Thanked: 10 times
    • View Profile
Re: The birth of a gnarlster. HPN copied in South Africa
« Reply #16 on: November 14, 2017, 08:56:53 pm »
 :sip:
KTM 990
KTM 525
Harley Davidson 1450 Deuce
Aprilia Moto 65
 

Offline Dustdevil

Re: The birth of a gnarlster. HPN copied in South Africa
« Reply #17 on: November 15, 2017, 09:59:26 am »
The broken top tube.
This is a common problem with HPN frames.
I have myself had this happen in one of the most remote areas north of the White Lady Lodge as can be seen in this video.
<iframe width="560" height="315" src="
" frameborder="0" allowfullscreen></iframe>

When visiting HPN in 2005 there was another bike that had the exact same brake on the top tube. The owner, Dieter, hit some animal on the road in South America causing the failure.

I designed an extended gusset to help reinforce this particular weak spot.
« Last Edit: November 15, 2017, 10:15:43 am by Dustdevil »
 
The following users thanked this post: pietas

Offline rohann

Re: The birth of a gnarlster. HPN copied in South Africa
« Reply #18 on: November 15, 2017, 02:33:54 pm »
Goeie moer, ek het nog nooit 'n bike gesien so gelaai soos daai 800 GS nie  :eek7: :eek7: :eek7: :eek7:
 

Offline Black_Hawk

  • BackroadRiderZA
  • Senior Member
  • ***
  • Bike: BMW F800GS
    Location: Western Cape
  • Posts: 1,826
  • Thanked: 8 times
  • Follow our blog: https://mytownsatoz.wordpress.com
    • View Profile
    • My Towns A to Z
Re: The birth of a gnarlster. HPN copied in South Africa
« Reply #19 on: November 15, 2017, 02:49:32 pm »
Looking good  :thumleft:

Subscribed  :sip:
Follow our blog: https://mytownsatoz.wordpress.com

2010 F650GS (Sold), 2009 BMW F800GS, 2002 BMW F650GS (Sold), 1982 Honda XR 200R, 2007 F650GS Dakar