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Ian Soady¹ said :-
Of course you will already have checked that you can get a replacement flywheel.....
18/04/2025 13:10:56 UTC
Glyn said :-
Yes Ian, I have my name on a used flywheel for £60. The seals and woodruff keys are readily available as is a gasket kit (£20 would be £100+ if it was a Jap bike of that age), Main bearing £20. I’m hoping to get away with about £120 all done.
19/04/2025 08:25:21 UTC
nab301 said :-
Fair play , progress of sorts at any rate!
Nigel
21/04/2025 15:01:52 UTC
Glyn said :-
It never rains but….. I knocked the Fantic clutch basket off the bench, it hit the floor and 3 of the web pieces broke off! Oh deary me and there’s no new parts available. I’m about to have the parts delivered that I ordered and cant finish it when they arrive now. Will be a long hunt to find something that I can use. Why do they make them in cast alloy, surely they should be steel. That’s going to be a possibility as it doesn’t look too difficult to remove the part with all the cogs on and make a steel basket.
22/04/2025 11:24:47 UTC
Ian Soady¹ said :-
Oh no, I've had similar happen to me. Usually when I'm rushing or tired....
That looks a tricky thing to remanufacture. If it was me I suspect I might just stick it all back together although wouldn't feel comfortable selling it on like that. No clutches available on ebay?
This looks a bit similar?
https://www.ebay.co.uk/itm/335865901371?_skw=fantic+trials+clutch+basket&itmmeta...
22/04/2025 11:45:59 UTC
Ren - The Ed¹ said :-
OH POOP! I feel your pain Glyn.
22/04/2025 12:46:51 UTC
Upt'North ¹ said :-
1 step forward, 2 steps back, we've all been there me o'd mucka.
There must be one somewhere, but where?
Upt.
22/04/2025 19:00:50 UTC
Upt'North ¹ said :-
https://www.inmotiontrials.com/?s=Clutch&post_type=product...
22/04/2025 19:04:04 UTC
Glyn said :-
Thanks all, I got there on the eBay just before you Ian. It is actually from the 250cc 403 engine. I got the seller to measure it and count the teeth on the cogs and it seems to be the right part. I’ll be placing the order.
22/04/2025 21:35:20 UTC
Glyn said :-
The replacement clutch basket arrived from EBay …broken! You’re not wrong about these 2stroke things Ed!
24/04/2025 17:32:12 UTC
Ian Soady¹ said :-
Nowt to do with being a 2 stroke Glyn.... The photo on ebay doesn't show that damage so it must have been badly packed?
25/04/2025 10:01:32 UTC
Ren - The Ed¹ said :-
If it were a 4 stroke you'd never have had to remove the clutch basket in the first place...
The defence rests M'lud.
Ally welding... anyone?
25/04/2025 10:55:35 UTC
Glyn said :-
It wasn’t that badly packed but doesn’t take much to break if hit from the side. The broken part was in the packing. Seller is reluctantly offering to take it back but that doesn’t help me that much. Anyone for alloy sand casting?
25/04/2025 17:33:18 UTC
Glyn said :-
I’ve got the crankshaft sorted at last. The replacement bearing was a ball type and not a roller as before with fixed inner race. It was supplied by the Fantic guys at AG Bikes. This does not allow end play which the roller type did. Therefore I had to wet and dry the crankshaft very carefully until I had a sliding fit. I also struggled to fit a Speedi Shaft repair to put a thin ring over the crankshaft where the seal sits. The new bearing and seal fit nicely. In the picture you can see the bearing and the Speedi shaft just to the left of it.
29/04/2025 19:54:09 UTC
Ren - The Ed¹ said :-
In my ignorance - why do you need end play? The only thing that comes to mind is expansion due to heat.
30/04/2025 07:37:58 UTC
Glyn said :-
The original bearing naturally allowed end play because the crank could move sideways across between the rollers and crank sleeve. I thought it was for expansion. The new bearing was very tight on the crank and would never move sideways. With the bearing driven into the casing it was impossible to mate the two halves of the engine because you can’t really hammer the bearing onto the crank.
I managed to get the clutch basket welded but it took me hours to clean it up enough to get the first plate able to rotate within the basket.
30/04/2025 08:03:20 UTC
Upt'North ¹ said :-
Nice work Glyn. Can I book in for next Tuesday around 11 am for a Lambda service.
You can provide the choccy biscuits.
You're welcome.
Upt.
30/04/2025 09:22:31 UTC
Ian Soady¹ said :-
It's quite normal to have a ball bearing one end and roller the other - the latter is usually the drive side as the roller can take more load. End float is as suggested to allow for expansion. Velocette singles, which unusually have taper roller main bearings both sides, need to be assembled with a few thou end float which disappears when the engine warms up. This arrangement allows a very narrow and stiff crankcase.
The only potential problem with what Glyn has done is that if the sliding fit is too slack there's a possibility of the inner sliding on the shaft in use thus acting as a very inferior plain bearing.
30/04/2025 09:58:36 UTC
nab301 said :-
Glyn , current troubles aside, back tracking to the main bearing saga would something like this have been any use, I bought one years ago but misplaced it until recently , two tapered halves which are clamped together
Nigel
30/04/2025 16:15:29 UTC
Glyn said :-
Nigel, That looks very possibly an answer to removing the press fit shaft centre of the roller bearing that was on the crankshaft. It was actually a very tight fit though and I had to deploy several methods to get it off. Grinding 80%+ of the way through plus the home made puller that I welded on to the remnants of the inner bearing. Ian, I’m not sure that the centre of the bearing, touching the shaft, would ever turn easier than the bearing itself unless the bearing was shot. This is the official bearing supplied by the Fantic parts dealer although the original is still available on-line. I think it would be very easy to return to the original set up unless the shaft was particularly badly damaged. The BSA engines I used to work on were all assembled in one half of the crankcases and then the other half was slipped on in the same way as this with the crank sliding through the bearing in the second half of the cases. Hopefully it’ll be ok as I’ve got the enter thing assembled ready to be returned to the frame.
30/04/2025 20:12:35 UTC
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