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Pre Unit Gearbox Issues #666913
09/08/16 1:15 pm
09/08/16 1:15 pm
Joined: Oct 2004
Posts: 258
UK
B
BSAPhill Offline OP
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UK
Hi,
The kick starter on my T110 is dropping (rotating backwards) when I accelerate in first and second, any ideas why this is happening?

Cheers

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Re: Pre Unit Gearbox Issues [Re: BSAPhill] #666919
09/08/16 1:45 pm
09/08/16 1:45 pm
Joined: Aug 2001
Posts: 7,309
scotland
triton thrasher Online content
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Was it ok and then started doing this?

Have you interfered with the gearbox cover recently?

Last edited by triton thrasher; 09/08/16 1:46 pm.

Amateur Loctite enthusiast.
Re: Pre Unit Gearbox Issues [Re: BSAPhill] #666926
09/08/16 2:28 pm
09/08/16 2:28 pm
Joined: Oct 2004
Posts: 258
UK
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BSAPhill Offline OP
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UK
Started to notice it about a week ago and it coincided with first gear getting crunchy and the clutch getting stiff on the release.

Checked and changed both the primary and gearbox oil but no better, the clutch and first gear get worse once things have warmed up.

Re: Pre Unit Gearbox Issues [Re: BSAPhill] #666928
09/08/16 2:53 pm
09/08/16 2:53 pm
Joined: Jul 2013
Posts: 473
Death row next in line norfolk
Tribsauk Offline
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Death row next in line norfolk
Check k/s spring as it sounds like its getting weak,should flick back strongly. Either way I would remove outer cover to check ...Dave


1941 BSA WM20
1958 TRI-BSA 750 PRE UNIT
1957 THUNDERBIRD
1932 R E MODEL GS SPECIAL
1947 BSA YM21
Re: Pre Unit Gearbox Issues [Re: BSAPhill] #666933
09/08/16 3:28 pm
09/08/16 3:28 pm
Joined: Aug 2001
Posts: 7,309
scotland
triton thrasher Online content
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scotland
It would be odd for the big clock spring on the kickstart to become weak suddenly.

While the gearbox outer cover's off, check the nut on the mainshaft is not loose.

Also check that the ratchet pinion on the mainshaft turns one way and is held into the ratchet by the thin spring behind it. That spring can break.

Don't take the pedals off before removing the gearbox cover.

Last edited by triton thrasher; 09/08/16 3:31 pm.

Amateur Loctite enthusiast.
Re: Pre Unit Gearbox Issues [Re: BSAPhill] #666980
09/09/16 1:59 am
09/09/16 1:59 am
Joined: Oct 2004
Posts: 258
UK
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BSAPhill Offline OP
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UK
Cheers, I see a job for the weekend looming

Re: Pre Unit Gearbox Issues [Re: BSAPhill] #667106
09/10/16 5:58 am
09/10/16 5:58 am
Joined: Oct 2004
Posts: 258
UK
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BSAPhill Offline OP
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UK
Kick starter sorted, the return spring was 180 degrees out.

Been suggested that a 7 plate clutch and T120 springs will sort the gear change out.

Re: Pre Unit Gearbox Issues [Re: BSAPhill] #667110
09/10/16 7:44 am
09/10/16 7:44 am
Joined: Aug 2001
Posts: 7,309
scotland
triton thrasher Online content
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Adjust the clutch you've already got.


Amateur Loctite enthusiast.
Re: Pre Unit Gearbox Issues [Re: BSAPhill] #667143
09/10/16 12:52 pm
09/10/16 12:52 pm
Joined: Jul 2006
Posts: 372
Kent, UK
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Nick_Smith Offline
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Kent, UK
I'd agree with Triton Thrasher above.

The Bonnie springs will just make the clutch pull heavier, rather than improve the clutch.
Get the main adjustment correct (pushrod clearance) and check that the pressure plate lifts square.

Otherwise, what oil are you running in the primary?

N


"1967 TR6R"
Re: Pre Unit Gearbox Issues [Re: BSAPhill] #667238
09/11/16 11:22 am
09/11/16 11:22 am
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UK
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BSAPhill Offline OP
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UK
I'll check it all in the week, the pushrod clearance is good, but I've not ventured into the clutch yet. Not too sure what oil the clutch has in it as it was put in by the P/O, it's been suggested that ATF would be good to use, any thoughts?

Re: Pre Unit Gearbox Issues [Re: BSAPhill] #667242
09/11/16 11:47 am
09/11/16 11:47 am
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Posts: 1,816
South cone
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reverb Online content
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...I have the cork inserts and the other day I cleaned them up with kerosene and the difference is notorious good.

Check for indentations; if you have it fill it (welding)
change the primary chain.

Re: Pre Unit Gearbox Issues [Re: BSAPhill] #667313
09/11/16 9:01 pm
09/11/16 9:01 pm
Joined: Jul 2007
Posts: 886
Tasmania - Gateway to Antarcti...
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The late pre units (post '58 I think) have a seal on the drive end of the crankshaft so ATF would be fine. Before that the engine could breathe through the drive side main bearing so there is a chance of getting ATF mixed in with the engine oil.

I'm using the same oil as in the engine on mine ('55) with no problems.


"Live the life you love, find a god you trust and don't take it all too seriously"

Pre-units rule!

Mid fifties Triumph T100
Re: Pre Unit Gearbox Issues [Re: BSAPhill] #667316
09/11/16 9:29 pm
09/11/16 9:29 pm
Joined: May 2014
Posts: 334
New Jersey
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Fetch Offline
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New Jersey
I've been using ATF in my pre-unit and it seems to work fine. MY Primary case is marked "USE LIGHT SAE 20 OIL" I understand ATF is approx SAE 20.


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