Author Topic: Should I go in  (Read 511 times)

0 Members and 1 Guest are viewing this topic.

Offline Crashtestdummy

  • Full Member
  • *
  • Posts: 40
  • Country: gb
  • Location: Kent
Should I go in
« on: January 12, 2019, 07:15:08 am »
Hi guys,
My recently purchased plunger c11 needs help, it looks like I can keep her now but the clutch and possibly the gearbox need work, as the gear change is difficult and clunky but will select and work as an amateur spanner twister should I go in or seek experience experienced help? Your thoughts please.
What help is out there for these old girls?

Online Owen

  • Administrator
  • Gold Member
  • ****
  • Posts: 7512
  • Country: england
  • Solutions not problems
  • Location: Hampshire
Re: Should I go in
« Reply #1 on: January 12, 2019, 07:44:57 am »
We could all speculate as to what the problem could be and confuse the issue. However without finding what is actually causing the issues and acting on that you will never get it sorted.
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11
Anyone want a B20 in need of a lot of tlc

Online griff

  • Full Member
  • *
  • Posts: 946
  • Country: england
  • Location: Shavington, Cheshire
Re: Should I go in
« Reply #2 on: January 12, 2019, 08:49:04 am »
I'd sort the clutch first as that can give many false impressions of a duff gearbox. If the clutch is dragging the gearbox does not like to play at changing...    ;)   Griff
Ride safely and no pinchmarks on the seat.
 Feet-up, only on trials sections...

Offline timsdad

  • Gold Member
  • ****
  • Posts: 6984
  • Country: england
Re: Should I go in
« Reply #3 on: January 12, 2019, 08:50:10 am »
This could be the start of another really long posting, which may well be in danger of upsetting hb!

First you have to get the bike up off the ground so the rear wheel will spin freely, Mr C. Then you try it up and down the gears without the engine running, while turning the rear wheel  by hand, and report back here with what that feels like, then we can hopefully point to the clutch or the gear selectors. You don't say if the problem is stationary or on the road, straight away or after a few miles, if you've checked the oil in the gearbox and if all is adjusted correctly.

It's no good e-mailing the doctor and saying your tummy hurts - he'd need a bit more background information!


Ray
Just a motorcyclist.

Online Owen

  • Administrator
  • Gold Member
  • ****
  • Posts: 7512
  • Country: england
  • Solutions not problems
  • Location: Hampshire
Re: Should I go in
« Reply #4 on: January 12, 2019, 08:53:23 am »
As I said previously, there could be a multitude of reasons.  Better to investigate and find out the facts.
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11
Anyone want a B20 in need of a lot of tlc

Online hampshirebiker

  • Gold Member
  • ****
  • Posts: 5506
  • Country: england
Re: Should I go in
« Reply #5 on: January 12, 2019, 09:01:23 am »
Ray, thank you for your comment. I only get annoyed (I'm sure like others) when the threads go nowhere and the same posters ramble on about the same things endlessly.
Postal - Liphook Hants - But just into West Sussex.

Offline timsdad

  • Gold Member
  • ****
  • Posts: 6984
  • Country: england
Re: Should I go in
« Reply #6 on: January 12, 2019, 09:20:26 am »
Just taking the piss, hb, - I'm sure 'none taken' !

Ray
Just a motorcyclist.

Offline Crashtestdummy

  • Full Member
  • *
  • Posts: 40
  • Country: gb
  • Location: Kent
Re: Should I go in
« Reply #7 on: January 12, 2019, 09:26:38 am »
Guys
All useful stuff. Withbike not running still clunky gear change, running first can be smooth or awful and third sometimes seemingly impossible, I thought clutch as it is difficult maybe I start here first then look for more advice on

Offline Crashtestdummy

  • Full Member
  • *
  • Posts: 40
  • Country: gb
  • Location: Kent
Re: Should I go in
« Reply #8 on: January 12, 2019, 09:58:17 am »
This could be the start of another really long posting, which may well be in danger of upsetting hb!

First you have to get the bike up off the ground so the rear wheel will spin freely, Mr C. Then you try it up and down the gears without the engine running, while turning the rear wheel  by hand, and report back here with what that feels like, then we can hopefully point to the clutch or the gear selectors. You don't say if the problem is stationary or on the road, straight away or after a few miles, if you've checked the oil in the gearbox and if all is adjusted correctly.

It's no good e-mailing the doctor and saying your tummy hurts - he'd need a bit more background information!


Ray

Ray thank you more great advice, kind am still learning and welcome all advice, with the bike not running and oil in the gearbox it is still clunky and third can be hit and miss, on the road first can be smooth or awful second is usually smooth and third sometimes seemingly impossible I will look at the clutch first, I found a company in saffron Waldon that can rebuild the gear box at £60 per hour! So all is not lost yet. I will see what clutch plates are fitted and get back on here.

Online Tman

  • Silver Member
  • ***
  • Posts: 2164
  • Country: england
Re: Should I go in
« Reply #9 on: January 12, 2019, 12:11:06 pm »
£60 an hour for a gearbox rebuild? It's enough to tempt me out of retirement!
With 60 year old gearboxes a lot comes down to technique when changing. Usually if the gear engagement or selectors are out of adjustment then gear change is crap all the time, but if only occasionally then it's often down to variables like road speed, hot/cool gearbox, hot/cool clutch etc.
I'd investigate further before paying anyone £60 an hour to fanny around with it!

Offline timsdad

  • Gold Member
  • ****
  • Posts: 6984
  • Country: england
Re: Should I go in
« Reply #10 on: January 12, 2019, 12:23:02 pm »
Reading between the lines, and knowing these old bikes, I'd hazard a guess that the gearbox selector mechanism needs indexing,  Mr C. If you can fire up the motor, pull the clutch in, count three seconds and then select first gear fairly easily, and the bike doesn't try to creep forward, then your clutch is probably fine.

Indexing the gearbox is very easy and is explained very well in all the BSA instruction books and also in the relevant Technical Information section on this site. It just involves pulling the gearbox casing off and refitting it in the correct position so the marks line up - a bit like timing marks on a camshaft. It could also be a spring-loaded plunger stuck down, under one of those caps in the casing, allowing the gears to float about instead of stopping in the right position. Gearboxes vary a bit between three and four speeders, yours seems to be a three, but all constant mesh, positive-stop gearboxes work basically the same.

BSA gearboxes are really bullet proof and rarely suffer from anything more than a broken spring or an oil leak. However, they never managed to make them mechanic-proof!

Next question?


Ray
Just a motorcyclist.

Offline timsdad

  • Gold Member
  • ****
  • Posts: 6984
  • Country: england
Re: Should I go in
« Reply #11 on: January 12, 2019, 12:25:05 pm »
I've just spent about half an hour on this diagnosis - that's thirty quid's worth!

Ray
Just a motorcyclist.

Offline Donald

  • Full Member
  • *
  • Posts: 168
  • Country: scotland
  • Location: midlothion
Re: Should I go in
« Reply #12 on: January 12, 2019, 12:53:56 pm »
I've just spent about half an hour on this diagnosis - that's thirty quid's worth!

You do it as a labour of love Ray, and we are all very grateful for it

Offline Crashtestdummy

  • Full Member
  • *
  • Posts: 40
  • Country: gb
  • Location: Kent
Re: Should I go in
« Reply #13 on: January 12, 2019, 03:46:57 pm »
I've just spent about half an hour on this diagnosis - that's thirty quid's worth!

You do it as a labour of love Ray, and we are all very grateful for it

The above quotes are so true, I am aware that as a newbie the questions have possibly been asked many times before but I am so grateful for all the help, advice and humour I find on here.
Thank you all,
Andy

Online griff

  • Full Member
  • *
  • Posts: 946
  • Country: england
  • Location: Shavington, Cheshire
Re: Should I go in
« Reply #14 on: January 12, 2019, 06:08:41 pm »
  Humour ? You think we are joking ?  Eee 'eck lad thars a beet bakkuds in cummin forards..  Wait 'till thar gets a glimps on sum o these ere fellas. You'll be put of tea fer life thar knowst.....  ::)
Ride safely and no pinchmarks on the seat.
 Feet-up, only on trials sections...