c90MG '91 clutch case/cover

[MTD606]

mines got a tiny split near the adjusting nut....can these covers be welded at all or is it a case of just replacing it?

tar muchly

[Devon general andy]

I presume it's weeping engine oil..... is it?
Is it definitely a split or crack?
There's a rubber 'o' ring that seals under the adjusting nut and washer.
Andy.

[MTD606]

aye its weeping/leaking from the hairline split 3-4mm away from the washer under the adjusting nut, the nuts not been over tightened but she did go from 3rd to 1st (due to the mechanic not knowing much about c90s it now can do that whilst on the move) I thought I'd just not shifted gear fully so did it again and 'RIIIIIIIIIIIIING' she went! so yeah just keepin an eye on ebay now....

[Devon general andy]

I did repair one once with some two pack epoxy metal glue.i picked up a scrap bike. It was a hole though...right up the top on the side due to falling over so less critical with the oil. I doubt you'll successfully fill a crack without opening it up bigger? It'll probably open up when hot and the metal expands and the oil thin and weep out. A good aluminium welder could probably sort it if you can find one? Probably easier to source a second hand cover?
You have an electric start (MG) model... don't you? Anyway I'm pretty sure the kick only and electric ones share the same 'clutch cover' casing. So that opens your options more.
It's just the left ( flywheel side ) that's completely different with everything.
Another member might give you another option?

Should physically only go 3rd to 1st when drive sprocket stationary. You haven't had clutch work or engine work have you? Engine revs can be well over the top if that's possible 3rd to 1st. They're tough engines. Just make sure oil up to max on stick... don't screw in.. just rest on top of threads
Cheers Andy.

[MTD606]

tar for the reply A, aye She's had engine work done in May (crankshaft snapped)...... I know about it not meant to go from 3rd to first unless stationary but after the right faff on I've had sorting out the clutch ( when it was put back together the 'mechanic' failed to replace the clutch spring and curved/sprung washer, so I'm gonna take a wild guess that he forgot something else.....) I really couldn't be arsed to fix the issue/take the old dear apart again tbh as apart from that she was fine..... I shall keep on looking for another casing

[Devon general andy]

Hi again, yes sorry I remember now a few months back, your stalling clutch problems!
I don't know how many times you took it apart !

When I was in my teens, pretty much every machanic I knew of, had worked on Cubs at some point. I hear a lot of comments these days that it's hard to find someone that can work on them!

You might be able to get some specialised repair kit for the cover? There's no oil pressure in there..... just hot (and thin when hot) oil to Ouse out. I wonder if all the problems and misalignment of the clutch has had something to do with the crack / split occurring?
Did you ever find out what caused the crank to snap...... was it out of oil?
Andy.

[MTD606]

with regards the crank, the 'mechanic' says that an oil seal wasn't where it should have been and had been blocking oil flow (?) ...... I do keep thinking about just replacing the engine with a lifan or similar given the amount of issues I've had.....

[MTD606]

would an early 12v clutch cover (one with the oil type and capacity) be ok to use with a '91 reg'd cub? they look the same apart from where the cam plate is situated has a few more ribs eminateing from the center hole

[Devon general andy]

Don't think it'll fit!
Honda redesigned the 90's in the '80s.

I've just read that back,
I'll start again, ha Ha

In about 1984,Honda revamped the C90s.
12 volt electronic ignition electrics and the engines were pretty much an 85cc version of the C70 engine. The 3 plate clutch basket was now in the 90 (85cc) engine. Everything needs to mate / line up properly. Also there's an oil feed that comes up the cover and feeds the centre of the clutch ( spinner filter and crank).
This MUST BE A CORRECT FIT!!

If another member has fitted an earlier clutch cover to a later HA02 engine then maybe they can advise what the outcome was?
Cheers Andy.

[MTD606]

they both have the oil feed hole and the casing shape looks the same as far as the bolt holes go but where the clutch would fit looks slightly different on the replacement?