Author Topic: Project "Laubfrosch" - the trials hybrid  (Read 21756 times)

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Adrian II

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Reply #165 on: December 22, 2020, 02:25:06 pm
This might be of interest, ethanol-resistant floats for the Monobloc carburetor.

http://amalcarb.co.uk/monobloc-series/376-series/floats/monobloc-stayup-float-viton-tipped-needle-valve-kit.html

A.
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nonfiction

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Reply #166 on: March 02, 2021, 08:42:54 pm
Can somebody please give me the name or a description of the handlebar Grumbern has used on this bike? It's the bend I believe I'd like to have on mine.

This build, and Grumbern's skills with both showing and telling about it are utterly inspiring!


Adrian II

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Reply #167 on: March 02, 2021, 09:37:29 pm
I think he calls them a set of chopper bars very early on. How about a set of Western or semi-Western handlebars from a Brit bike specialist who has spares for the export 70's Nortons or later (Meriden) Triumph twins?

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nonfiction

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Reply #168 on: March 02, 2021, 11:46:00 pm
@Adrian, Yeah, I _think_ it might be a Western bar, but with everything closed, it's pretty hard to get your hands on anything to know the feel for sure.

What I'm wanting is to effectively move the grips forward to where they'd be with a normal trials/scrambles bar if the clamps were over the stem, not 2" behind it. Threadjack done though.


Adrian II

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Reply #169 on: March 03, 2021, 01:13:33 pm
Our Indian friends have top yokes/triple trees where the handlebar clamps are in front of the stem, which they fitted to the 535 Lightning and 350 Thunderbird (home market) models. If you have jest spent reasonably big $$$ on the alloy top yoke, it's easier to change bars.

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nonfiction

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Reply #170 on: March 03, 2021, 08:03:09 pm
Yeah, those new style clamps are, uh, exceedingly utilitarian looking—nothing like the beauteous curves and distinctive shapes of the casquette or the trials top yoke. No interest there, though I would consider swapping on a set of Ceriani or similar European alloy triples from the '60s if such were to turn up in my feed.


grumbern

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Reply #171 on: March 04, 2021, 03:23:57 pm
I'm very sorry, but I have no idea where these bars originated from. These were mounted on the bike I salvaged and took parts from for the Laubfrosch. It just looked right, when I put it on there and so I kept it. I believe there were some Bullets in the early 90s, or even mid-80s equipped with higher bars like this one, but there might be others from smaller Japanese bikes that would come close to this one.
Regards,
Andreas


nonfiction

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Reply #172 on: March 04, 2021, 04:42:38 pm
Thanks Andreas. No worries, and please keep up the gorgeous work on this beastie!


grumbern

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Reply #173 on: March 14, 2021, 11:05:58 am
Some things happened until now.
Firstly, I set the bike up on my multi purpose IKEA table ;)




Then I started working on the foot pegs:








As I messed up the other one due to gas contamination wile TIG-welding and I wanted to move the pegs a little higher anyway, I made a second pair:








I also removed the gearbox cluster for inspection:




As it showed this was no mistake, as the high gear pinion has a broken tooth:




These are still the old pinions with 30-18 gearing, but I ordered a 15/25 replacement that should do as well from India.
Otherwise the gears look fine, but when disassembling the rear wheel for putting in new spokes, I damaged one lockring stud:




The previous owner glued the nut with thread lock. Hopefully I'll be able to obtain another one, or else I'll have to make one myself.
So long,
Andreas


Adrian II

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Reply #174 on: March 14, 2021, 01:07:03 pm
A source of imperial thread fasteners in stainless steel (metric too, as well as Laverda parts).

https://www.motalia.co.uk/stainless-fasteners.html

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symmo

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Reply #175 on: March 15, 2021, 08:39:13 am
Are you going to use this Enfield in competition? Just an observation I think you might find the footrest a bit on the low side, your feet need to be up out of the way of rocks and so on. I trialled an Enfield back in the 70s and rocks, going over logs etc catching your feet were the most reason to bring you to a halt. my foot rest were up by the swing arm pivot.


grumbern

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Reply #176 on: March 15, 2021, 04:34:47 pm
Thanks Adrian, this site might be helpful some time!

@Symmo: No, at the moment I have no plans of using it for competition, just for fun, but with a competitive touch ;)
I mean, it should be built so it might be (or have been) used in competition, but I don't need to go into every last detail as it could cost me a point or two otherwise. If that was the case, I guess some other details would have called for different choices as well (for example engine mounts from Aluminium instead of steel).
The pegs aren't that low really, because the suspension is quite a bit higher than original (about 3-4 inches).


Andreas


Adrian II

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Reply #177 on: March 15, 2021, 04:55:54 pm
Longer rear shock absorbers will mean a bit of extra work dealing with the rear chain run, quite possibly! I you haven't already seen it, this neat chain tensioner set-up was posted on Hitchcocks' forum recently.

A.

https://messageboard.hitchcocksmotorcycles.com/viewtopic.php?f=3&t=11467
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grumbern

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Reply #178 on: March 18, 2021, 05:14:28 pm
Yes probably. I thought about fitting sliders of any sort, but I'll see once a chain is put on.
Andreas