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FT: Frame (Twin) Comet's FT163

fishingpaul

Website User
VOC Member
I have a broken tab on my Comet's FT 163, and need to have it welded. Since it's a cast, old-type of aluminum are there any hints or advice as to how this should be done?

DSC_0171 (2).JPG
 

Robert Watson

Well Known and Active Website User
VOC Member
Bring it over, I'll weld it up for you, have done a few......

Heat it and clean it, rinse and repeat (until no oil appears). Tig with the softer of the two common rods, I don't remember the number.....

Oh, and grind it back a bit to give some space to fill with weld.....

I know

Absolutely of no help,
 

brian gains

Well Known and Active Website User
VOC Member
if it was me and given the requirements of the cover, i'd be tempted to go DIY and try that fluxed ali welding rod that you use with a MAP torch. seems you can't turn around at the moment without some promotion for it and how easy it is to use.
 

fishingpaul

Website User
VOC Member
Brian,

Thanks. I located an expert welder of aluminum on recommendation from 2 local VOC friends, so I think I'll get it done professionally.
 

Bill Thomas

Well Known and Active Website User
VOC Member
Yes that solder weld is not easy to use and I don't think it will be strong enough for that job.
When it's done, Might be an idea to make a thin tube to go between the lugs, So it doesn't strain it again ?.
Cheers Bill.
 

fishingpaul

Website User
VOC Member
Bill,

Thanks for the good advice. Incidently, to all VOC members, if you happen to be visiting the Washington, D.C. area......we live about 15 miles west........and are always good for a meal, and lodging if needed.

"Champagne" Paul
 

chankly bore

Well Known and Active Website User
Non-VOC Member
A couple of things to note: If you can set it up accurately it is worth bushing the holes through which the stud F122 passes as otherwise you may hear a mysterious untraceable rattle in transit. Go minimum o.d. to tidy up and bush with Loctited bronze. If you use the propstands to lift the front wheel you must slacken off the through stud and the top mounting setscrew through the tab from the crankcase stud. This setscrew should be 1/4" B.S.F. nowadays most are not. You may as well helicoil it back to standard while you are at it.
 

Bill Thomas

Well Known and Active Website User
VOC Member
I never really like that Mag' cover fitting, I know it was done to make it quick and easy, But it can be a fiddle to fit sometimes, Plus the chance of over tightening.
So the last 2 sets of "Alloy" prop stand plates I have made, I made holes rather than slots,
And fit a bolt to each side , From the inside, With a domed s/s nuts outside.
So NO awards for me :) , Cheers Bill.
 

timetraveller

Well Known and Active Website User
VOC Member
Doesn't that put a strain on the ali ears if the mag cover is not exactly the same width as the distance between the plates?
 
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Bill Thomas

Well Known and Active Website User
VOC Member
It works for me, if it needs a washer between, then so be it.
 
Last edited by a moderator:

Cyborg

Well Known and Active Website User
VOC Member
Bring it over, I'll weld it up for you, have done a few......

Heat it and clean it, rinse and repeat (until no oil appears). Tig with the softer of the two common rods, I don't remember the number.....

Oh, and grind it back a bit to give some space to fill with weld.....

I know

Absolutely of no help,
I have some 4943 if you want to give it a try. I haven't tried welding any castings. You must have to do that rinse repeat cycle a few times. My Comet cylinder muff is like an oilite bushing.
Wash.jpg
 
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ClassicBiker

Well Known and Active Website User
VOC Member
Glad to see I'm not alone in using the dishwasher that way. I did that with both my heads recently after grinding in the valves. Funny enough SWMBO didn't have an issue with it.
 

Viny4

Well Known and Active Website User
VOC Member
The early Bs were threaded in the Cowl. I mentioned this to PEI saying that I thought it was better than the threaded stud. He didn't think so.
 

Bill Thomas

Well Known and Active Website User
VOC Member
I have one that had to be welded, Many years ago,
I never thought of that, Good idea. Cheers Bill.
 

peter holmes

Well Known and Active Website User
VOC Member
A couple of things to note: If you can set it up accurately it is worth bushing the holes through which the stud F122 passes as otherwise you may hear a mysterious untraceable rattle in transit. Go minimum o.d. to tidy up and bush with Loctited bronze. If you use the propstands to lift the front wheel you must slacken off the through stud and the top mounting setscrew through the tab from the crankcase stud. This setscrew should be 1/4" B.S.F. nowadays most are not. You may as well helicoil it back to standard while you are at it.
Bit of an overcomplication, a good slosh of Araldite on the through rod solves any rattles that you might have,
has worked for me 50+years. Is it Marcus Bowden that says KIS (keep it simple)
 

MartynG

Well Known and Active Website User
VOC Member
Bit of an overcomplication, a good slosh of Araldite on the through rod solves any rattles that you might have,
has worked for me 50+years. Is it Marcus Bowden that says KIS (keep it simple)
KISS principle. Extend the thread (1/4" BSF) on the thru pivot rod F122 comet, FT155 twin, then fit a washer and nut on the rod INSIDE of the cowl, both sides and tighten against the INSIDE of the cowl lug; secure those nuts with loctite. Vola the cowl 'legs or lugs' are now fully supported and it's a doddle to tighten up the outside retaining nuts without any risk of fracturing the cowl or having any rattles. See next edition of OVR



P1010829.JPG
 

vibrac

Well Known and Active Website User
VOC Member
Eagle-eyed people looking at that picture of Ben on last month's cover will notice there is no FT163 the rain was so intense that the race was called off after 3 laps Ben said the bike never missed a beat although the main straight was awash like riding an Amanda and the flow on Mansfield moved the back wheel
It makes you wonder what use the cowl is.
NB the BTH coils were mounted on the front sidecar lug by the steering head
 

peter holmes

Well Known and Active Website User
VOC Member
I think Vincent's always look more attractive with the mag cowls fitted, whether that be B, C, or D, irrespective of whether they serve any practical function.
 

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