TW wrecks a perfectly good Commando etc.

Time Warp said:

The top plate (black with one linear bearing) sandwiches to the lower (red with one linear bearing ) unit and fixes at the four 2BA screw locations at the top of the Amal's
The red unit sits in between the two carburetors.
A throttle cable drum with Crotch crank raises and lowers the ground rod doing the same for the top yoke which does the same for the slides.
There would be basically no 'junk on top of the carburetors, just the yolk and its pull rods.

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Hi Time Warp, why not take a really inventive step and build a ride-by-wire device, i.e., an electric throttle actuator?
Your sketch lends itself to the idea.

- Knut

mdt-son said:

Hi Time Warp, why not take a really inventive step and build a ride-by-wire device, i.e., an electric throttle actuator?
Your sketch lends itself to the idea.

- Knut

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Google search history Feb 25th.

So you have considered it! The "efihardware" actuators are for large car engines and far too bulky for m/c use.
This linear actuator placed between the carbs should work far better:
Amazon product ASIN B076PYYPTM
- Knut

Time Warp said:

First job today is get the inlet manifolds so the carburetors are at the same height and level at the tops.
The manifolds as stock have the holes and studs skewed to each other which is not a problem with twin throttle cables but can present a problem (unless ignored) with a top gantry plate.

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Hi TW, I have yet to fit the Madass gantry and I am a little worried the carbs will be out of alignment. There is not only differential height to consider, but possibly a deviation in forward / aft position due to manifold differences. The latter happens if a line between centers of manifold inlets isn't parallel to the outlet. Apart from the fly cut providing equal height, how do you ascertain the centers are aligned?

- Knut

mdt-son said:

Hi TW, I have yet to fit the Madass gantry and I am a little worried the carbs will be out of alignment. There is not only differential height to consider, but possibly a deviation in forward / aft position due to manifold differences. The latter happens if line between centers of manifold inlets isn't parallel to the outlet. Apart from the fly cut providing equal height, how to you ascertain the centers are aligned?

- Knut

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Hello Knut

I have one of those gantries that has been in pieces for some time (but will not make a comment on it but had bought it to save the time making one and will on sell it later cheap)

The short version is the fly cutting sets the forward and aft, the inserts set the level and height.

The inlet manifolds although the same (because they are but the studs were twisted compared to the holes) were mounted on a machined plate with the studs into locating holes so both are inline. (From the machine vice to the adjustable angle plate)
The cylinder head side holes were then as per the drawing below, I considered simply using a cutter to make new holes (slots) at the 2" centres.
Instead I used both 10 mm and 11 mm cutters to make stepped (now offset to the original's, one up, one down) holes and stepped inserts (interference fit on both with Loctite 680 and needed a small tool to pull them in)
They had a small amount of stick out which was removed when the manifold faces were fly cut together.
The manifolds are now the same and the carburetor faces inline.
Any discrepancy is now at the new Premier carburetors.



Once that was done, the angle plate was used (with the Premiers mounted) to bring the clocked carburetors vertical based off their top faces.
The two main bores and four 2BA holes were then plotted with the Ditron DRO.
The gantry plate is machined to those plots, no oversize holes, no forcing anything.

It occurred to me now the plate I drilled wrong (Post #281) can be machined down to the minimum size (2BA positions) and thinned to 6 mm to become an alignment plate for carburetor fitting. (Instead of going in the scrap bin)
Building a stock Commando takes some time.

I will log this project and then call it quits for a bit due to recent developments with the western border opening.
Hopefully the titanium rod will turn up next week to complete it.

Not bad at under two weeks from the UK standard Airmail.

Time Warp said:

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Very nice but two observations:

#1 Since the threaded section for the oil filter is part of the housing, if the threads get damaged, you will need to either make a new one or fabricate an insert to repair this one.

#2 No beads on the oil hose stubs to prevent the hoses from coming off.

Time Warp said:

View attachment 95105

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Can you not see GP's new shed??

Time Warp said:

View attachment 95105

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Over this way or going home?

gortnipper said:

Over this way or going home?

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About 1300 kms north of Perth.

I can't see New Zealand happening for a long time thanks to the flood of Covid since the borders opened so still no family for well over two years now. My last Uncle died last month but could not get to the funeral.
I am seeing first hand daily the lingering respiratory infection of 'recovered people who now test negative. (all ages)

Time Warp said:

About 1300 kms north of Perth.

I can't see New Zealand happening for a long time thanks to the flood of Covid since the borders opened so still no family for well over two years now. My last Uncle died last month but could not get to the funeral.
I am seeing first hand daily the lingering respiratory infection of 'recovered people who now test negative. (all ages)

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Sorry to hear that, mate.

People at work are all keen to get over here/there. My boss and one of my peers went over there last week. I am happy to work in my little home office and only go in once a week. Kinda lonely sometimes, but better than the probable alternatives.

gortnipper said:

Sorry to hear that, mate.

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Its just the way so maybe later in the year.

Just got off the phone with Stephen Kelly regarding my next project using a new release Compass ignition kit.
It arrived very quickly (24 hour free post to my door)

It is for a latter twin points bike which has a larger OD housing and that housing will not fit this bike having a top mounted generator which it would hit.
All it needs is a custom distributor 7 mm bigger ID than the stock single point item, a new sensor mounting plate and customised shaft to suit the Tri-Spark trigger along with the stock distributor cap (with stepped reducer ring) so it looks stock on the outside.
How hard could that be.






Finished and ready for final assembly.

Brass dome nuts for the Compass ignition coil bracket.

Another head steady, this one for the 750.
Cost so far $17 and a ride on a sunny day.

Thanks (and the two likes in around 1200 views in two weeks)

I am not in the Shaky Isles.

I am not dropping in on this thread anymore!
Les's work makes me green with envy, depressed, and leaves me feeling inadequate!
Just kidding...... Actually, he is an inspiration.
Wish I lived near him...... I would visit and watch him make chips .....

Slick