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T: Fuel Tank New Project


Pushrod Twin

Well Known and Active Website User
VOC Member
This bike was put together from parts and the fork is from a Horex and the frontwheel is a Münch Mammut one.Unluckily the hub is cracked and is made from magnesium which can not be weldet I think.The UFM is the early type with no slot for the rear damper.
Interesting collection of bits! Do you think the tank modified for those forks? How was clearance between the forks & tank at full turn?
Unfortunate that the wheel is cracked. Magnesium can be welded successfully. I watched my father gas weld magnesium chainsaw bodies in the '70s. It is much more controllable with modern TIG welders.
That said, I would be reluctant to weld it. Machining the resultant distortion out of it can be difficult. I had an aluminium Grimeca hub welded once. I did machine it adequately to go back into service safely, but it wasnt really worth the effort. Magnesium distorts worse than aluminium, even without welding it. I have machined some shocking Mg aircraft castings, they just keep going back into service for another lap!
 

Bill Thomas

Well Known and Active Website User
VOC Member
I didn't have to bash my Tank in that much , When fitting Tele' forks, I just restricted the Steering Lock a bit.
 

erik

Well Known and Active Website User
VOC Member
We can rule the chaos! There were no bearings fitted on the fork and steering was very very restricted so that i can say the tank shape was not made for this forks.and the Münch brake was not adapted to the forks.All different bits fitted not properly together.Erik
 

peter holmes

Well Known and Active Website User
VOC Member
That's the easy bit !.
I have done a couple of heads like that, Not nice.
Good Luck. Bill.
Bill, When you say you done a couple of heads like that, do you mean you have created that carnage, or put it right after that carnage, I suppose it could be both.
 

Bill Thomas

Well Known and Active Website User
VOC Member
Note to self, Don't over rev' Vincent's, The cost is too much !.
17 years of Racing, Bound to have a few troubles.
We did try and weld one, But a blow hole came half way up the plug hole.
I think you have to find another ?. Cheers Bill.
 

davidd

Well Known and Active Website User
VOC Member
It is a mess. However, it is repairable. I have seen photos of the entire combustion chamber rewelded. The issue is usually one of ease and money. It may simply be a good option to use another head.

I would have said that the problem was something other than revs. A valve hitting a piston due to an insufficient valve pocket, for example. Using a cam that peaks at 6900 on the dyno requires a 7000 redline. The single engines have run that way for years without valve problems. The valve system seems pretty robust.

David
 

Pushrod Twin

Well Known and Active Website User
VOC Member
Because it was a rear head on the comet I will go the way to buy a new front head or a good used one.
Ha, I spotted the carburetor on it's side in the first pics, should have guessed. Saw one like that in Australia during the International Rally too. :)
 

TouringComet

Well Known and Active Website User
VOC Member
VOC Forum Administrator
My Comet, purchased as a basket case years ago, previously had a rear head. The carb manifold was neatly altered to angle out to the RHS, and the petrol tank had a cutaway added to the right side, so that the carb could be mounted as a mirror image to std, upright. The owner I bought the basket case from had already purchased a front head and patched up the cutaway. I might still have the altered manifold around somewhere.
 

Spqreddie

Well Known and Active Website User
VOC Member
This is my new project and I heard that this petrol tank is a tank converted by Fritz Egli in the very early years. Is this true?
May be you can ask him? he might still remember.
Whit these forks, the wheel base and steering angle remain the same?
 

erik

Well Known and Active Website User
VOC Member
Now with the input of the machine researcher, this basket case was never on the road or track as I bought it. The forks are definitive Horex ones and here in Germany they were often used to replace other forks especially on the NSU Max. The tank will be treated back to original form by my brother.@ Vincent: What is a cold repair? Regards Erik
 
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Vincent Brake

Well Known and Active Website User
VOC Member
Dycomet.nl

They spray with ultrahigh speed little metal parts.
Onto a metal surface.
Well known to make repairs without putting heat into it.

Then use the Hunger cutter to create a new cut for an alubronze seat.

Do not throw the head in bin.
But make a proper paperweight.

Cheers
 
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