BritBike Forum logo
BritBike Sponsor BritBike Sponsor BritBike Sponsor
BritBike Sponsor

BritBike Sponsor

BritBike Sponsor
BritBike Sponsor BritBike Sponsor BritBike Sponsor
  JWood Auction  
Home | Sponsors, Newsletter | Regalia | Calendar | Bike Project | BritBike Museum | Spiders Cartoons, "OLD" BritBike Forum | DVD- Manuals & Parts books | BritBike Stickers & Decals
Upgrade to: Premium Membership | Premium Life Membership | Vendor Membership | Site Sponsor Membership
Photo posting tutorial

Member Spotlight
DeejayP999
DeejayP999
London, England
Posts: 26
Joined: April 2003
Show All Member Profiles 
Shout Box
Search eBay for motorcycle parts in following countries
Australia, Canada, France, Holland, Italy, United Kingdom, USA
Random Gallery photo
Who's Online Now
202 registered members (57nortonmodel77), 1,704 guests, and 529 spiders.
Key: Admin, Global Mod, Mod
Newest Members
Brian Ellery, Jon Andrews, Berni Ernst, johnguppy, michael morgan
9955 Registered Users
Top Posters(30 Days)
btour 185
koan58 98
Stuart 87
NickL 59
Popular Topics(Views)
435,973 mail-order LSR
Forum Statistics
Forums33
Topics65,261
Posts631,968
Members9,955
Most Online3,995
Feb 13th, 2017
Like BritBike.com on Facebook

Previous Thread
Next Thread
Print Thread
Rate This Thread
Page 3 of 3 1 2 3
#712554 - 10/24/17 6:59 pm Re: A65 a pain to start [Re: Manx]  
Joined: Aug 2001
Posts: 3,399
gavin eisler Online content
BritBike Forum member
gavin eisler  Online Content
BritBike Forum member

Joined: Aug 2001
Posts: 3,399
argyll. scotland, uk
Lightning valves and late Thunderbolt valves are the same size.

Early models 62-65 Inlets 1.47 ", exh 1.41, all models.

Inlets increased to 1.6 " for some models Spitfires and Firebird scramblers from 1966, by 1970 all 650 models used this size , single carb as well.
This is according to Roy Bacon, BSA Twins and Triples,

i thought the L and T models got the 1.6" valves earlier than 1970, his other resto book mentions all inlet valves increasing in size after 1966, there are a few different part nos for valves over the A65 years,spring collet fittings changed as did valve spring types. In general later valves/ collets springs fit earlier models with no real problems,
The later 1.6" inlets can be opened up to 1.75" if the seats are Concentric enough.


Last edited by gavin eisler; 10/24/17 7:06 pm.

71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Support Your #1 BritBike Forum!
Membership Type! Free
Member
Premium
Member
Premium Life
Member
Vendor
Member
Site
Sponsor
Recognition No Premium Member Premium Life member (5 years) Vendor Member Site Sponsor Membership
Post commercial threads No No No Yes Yes
Custom title No Yes Yes Yes Yes
Upload avatar & photos No Yes Yes Yes Yes
Link avatar & photos Yes Yes Yes Yes Yes
Private Message Storage: 10 100 100 100 100
Length of signatures 255 600 600 600 600
Removes this very advert island between post 1&2 No Yes Yes Yes Yes
Price Free $12.90/year $105.00 No End
$55.00/5 years
$210.00/year
($17.50/month)
Email
Click on button >>
  Premium Member Premium Life member Vendor Member Site Sponsor Membership
#712557 - 10/24/17 7:12 pm Re: A65 a pain to start [Re: gavin eisler]  
Joined: Sep 2016
Posts: 85
Manx Offline
BritBike Forum member
Manx  Offline
BritBike Forum member

Joined: Sep 2016
Posts: 85
Norway
Ahh, I see... I`ll whip them out clean and measure them tomorrow.


1966 Rickman Metisse (a65)
1960 A10 golden flash
1960 lambretta li150
1942 Ariel W/ng
#712571 - 10/24/17 8:10 pm Re: A65 a pain to start [Re: Manx]  
Joined: Apr 2005
Posts: 1,581
Adam M. Online content
BritBike Forum member
Adam M.  Online Content
BritBike Forum member

Joined: Apr 2005
Posts: 1,581
Mississauga, Ontario.
Could you make a picture of them ?
Measure the clearances between valves and guides by rising them 5 mm in the guides and moving side to side.
If you feel any clearance they need new guides.

#712779 - 10/26/17 1:30 pm Re: A65 a pain to start [Re: Adam M.]  
Joined: Sep 2016
Posts: 85
Manx Offline
BritBike Forum member
Manx  Offline
BritBike Forum member

Joined: Sep 2016
Posts: 85
Norway
The thing is that I`m swapping heads. The thunderbolt head I aquired has visualy oval valve guides.

Today I sent the head off to SRM for a total overhaul, port flow, valve seats and guides, threads and the plug threads are also stripped so they will fix those too.

I am seriously thinking of doing a propper strip down, check the sludge trap new rods and pistons and a dynamic crankshaft balance.

After reading the blurb the Map Rods make more sence to me (oil throw and little end bush) but the balance would be done at SRM so might go for the SRM rods.. Hmm...

Last edited by Manx; 10/26/17 1:33 pm. Reason: thread

1966 Rickman Metisse (a65)
1960 A10 golden flash
1960 lambretta li150
1942 Ariel W/ng
#712805 - 10/26/17 5:14 pm Re: A65 a pain to start [Re: Manx]  
Joined: Apr 2005
Posts: 1,581
Adam M. Online content
BritBike Forum member
Adam M.  Online Content
BritBike Forum member

Joined: Apr 2005
Posts: 1,581
Mississauga, Ontario.
Lot's of dinaros .
I'm lucky to have very good machinist in my town :

[Linked Image]

[Linked Image]

[Linked Image]

[Linked Image]

[Linked Image]

#712820 - 10/26/17 7:29 pm Re: A65 a pain to start [Re: Manx]  
Joined: Sep 2016
Posts: 85
Manx Offline
BritBike Forum member
Manx  Offline
BritBike Forum member

Joined: Sep 2016
Posts: 85
Norway
Very nice. What carb do you use on that and it looks larger than 28mm


1966 Rickman Metisse (a65)
1960 A10 golden flash
1960 lambretta li150
1942 Ariel W/ng
#712833 - 10/26/17 8:41 pm Re: A65 a pain to start [Re: Manx]  
Joined: Apr 2005
Posts: 1,581
Adam M. Online content
BritBike Forum member
Adam M.  Online Content
BritBike Forum member

Joined: Apr 2005
Posts: 1,581
Mississauga, Ontario.
It was 28 mm carb and 28 mm ports, just cleaned to be even.
My carburetor was build on an old body and had original, short tickler, which was a pain to use.
But I believe you are going to buy a new one.

Last edited by Adam M.; 10/26/17 8:45 pm.
#712874 - 10/27/17 4:33 am Re: A65 a pain to start [Re: Adam M.]  
Joined: Sep 2016
Posts: 85
Manx Offline
BritBike Forum member
Manx  Offline
BritBike Forum member

Joined: Sep 2016
Posts: 85
Norway
True. But om not sure what to go for.

Last edited by Manx; 10/27/17 4:33 am.

1966 Rickman Metisse (a65)
1960 A10 golden flash
1960 lambretta li150
1942 Ariel W/ng
#712876 - 10/27/17 5:15 am Re: A65 a pain to start [Re: gavin eisler]  
Joined: May 2004
Posts: 3,546
BSA_WM20 Online content
BritBike Forum member
BSA_WM20  Online Content
BritBike Forum member

Joined: May 2004
Posts: 3,546
Sydney Australia
Originally Posted by gavin eisler
You can crudely estimate the bore wear using the bottom of the piston and feeler gauges, compare slip fit at bottom unworn section to 1/2 " below top of bore where there is max wear.
As for new pistons, how big is yer wallet?, I have dressed up similarly seized , worn pistons before and got away with it, do not use abrasive paper to clean up the seize marks ,a fine flat file to knock off the bumps is all I used, if paper is used abrasive particles get left stuck in the piston skirt, not good.. If the bottom end is sound use a degree wheel mounted on the alt rotor and a pointer to suss out your cam timing, take readings after the first 15 thou of lift.
To torque the heads I use a 1/2" AF ring spanner( my bike is a 71 , your head nuts might be imperial BSF sizes), this is cut down, ground a little thinner for access , and an old 3/8 " drive socket is welded to the sawn off shank so a torque wrench can be applied at 90 degrees to the axis of the spanner.

pic shows torque wrench adaptor. The staggered head is not needed, a flat ringer would be better, the two parts are welded to a chunk of thick wall pipe.
I used 28 lb ft torque all round the head , more than one thickness of head gasket is available, thicker is easier to seal, anneal before fitting .


That weld is far too good for a BSA rider


Bike Beesa
Trevor
#712885 - 10/27/17 10:03 am Re: A65 a pain to start [Re: Manx]  
Joined: Aug 2001
Posts: 3,399
gavin eisler Online content
BritBike Forum member
gavin eisler  Online Content
BritBike Forum member

Joined: Aug 2001
Posts: 3,399
argyll. scotland, uk
"That weld is far too good for a BSA rider"

I am sloppy welder second class, I got a real welder to stick the bits together. Cost 8 home made oatcakes.

As for Manxs carb, stick with a 28 mm Concentric mark 1 , the base jetting will be a lot easier, the 750 will suck harder and create higher gas velocities, MJs may have to go down a size rather than up,, but it will be an easy starting point.

Even if the guides are oval they can be lined back to size, however if SRM are doing the work they will probably recommend Kibblewhite guides, they used to do relining , but when they redid my head last year lining guides was no longer on their options, dont know why.

The motor is not difficult to pull apart for crank checks, you will need very thin jaws for the crank pinion puller, otherwise its pretty straightforward, be very careful to protect the crank quill end feed, if it gets a knock it will throw it out of alignment. The crank drive sprocket sometimes needs a puller, its tapped for two screws , which makes life a little easier if it is tight.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
#712907 - 10/27/17 3:07 pm Re: A65 a pain to start [Re: Manx]  
Joined: Apr 2005
Posts: 1,581
Adam M. Online content
BritBike Forum member
Adam M.  Online Content
BritBike Forum member

Joined: Apr 2005
Posts: 1,581
Mississauga, Ontario.
+ 1 to 28 AMAL Concentric carb, if you want better reliability go to Premium model.
As I wrote above my bike was one kick starter with this carb and had good torque, acceleration, speed and sipped gas, specially comparing to my current T150V smile.

#712911 - 10/27/17 4:05 pm Re: A65 a pain to start [Re: Adam M.]  
Joined: Sep 2016
Posts: 85
Manx Offline
BritBike Forum member
Manx  Offline
BritBike Forum member

Joined: Sep 2016
Posts: 85
Norway
Thanks fellas, Mk,1 Concentric premium orderd.

I have started to completley tear down the motor.... For the daftest question ever, I need a socket set but I`m not 100% sure what I have on my bike.

I have been using normal inch hex keys, I have some metric stuff on the bodywork, Whitworth works on some and varied unmarked spanners from car boot sales works on others but I have no Idea what I should be using.

Lambretta is so much easier because they use metric... ohh.. apart from the use of 7mm (try and find those in your local hardware store :D)


1966 Rickman Metisse (a65)
1960 A10 golden flash
1960 lambretta li150
1942 Ariel W/ng
#712917 - 10/27/17 5:39 pm Re: A65 a pain to start [Re: Manx]  
Joined: Aug 2001
Posts: 3,399
gavin eisler Online content
BritBike Forum member
gavin eisler  Online Content
BritBike Forum member

Joined: Aug 2001
Posts: 3,399
argyll. scotland, uk
BSF/ Whit tools in1966.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
#715179 - 11/15/17 10:23 am Re: A65 a pain to start [Re: Manx]  
Joined: Sep 2016
Posts: 85
Manx Offline
BritBike Forum member
Manx  Offline
BritBike Forum member

Joined: Sep 2016
Posts: 85
Norway
I recived an estimate on the head work needed to get it up to scratch from SRM (ouch!) and one thing they have added because it is recommended in conjuction with the 750 is porting and flowing the manifold to take a 30mm carb.

What are the advantages/dissadvantages with that?


1966 Rickman Metisse (a65)
1960 A10 golden flash
1960 lambretta li150
1942 Ariel W/ng
#715181 - 11/15/17 10:33 am Re: A65 a pain to start [Re: Manx]  
Joined: Aug 2001
Posts: 3,399
gavin eisler Online content
BritBike Forum member
gavin eisler  Online Content
BritBike Forum member

Joined: Aug 2001
Posts: 3,399
argyll. scotland, uk
Advantage, will breath a little freer at high revs.
Disadvantage, lower gas speeds at low revs, will be a little less tractor like.
With it being a 732 rather than a 650 , it may be better for ultimate power to use the 30 rather than the 28, I have no experience of single carb 732s.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
#715185 - 11/15/17 11:34 am Re: A65 a pain to start [Re: gavin eisler]  
Joined: Sep 2016
Posts: 85
Manx Offline
BritBike Forum member
Manx  Offline
BritBike Forum member

Joined: Sep 2016
Posts: 85
Norway
Ok. I`ll leave that in the hands of SRM.

I like the torque ive had with the twin carb setup but I have nothing to compare it with in the real world because I have had 2x32`s and proberbly less tractable in comparason anyway.

My new head was bent like a banana and they will weld it and machine it flat, some new threads, all singing and dancing valves and guides and even replace a couple of broken fins. They are also gas flowing the combustion chambers for an easier life with modern fuels.

I sent my cases to them on monday and I am not looking forward to the estimate on the work needed but if it means a more trouble free life with the motor it will be worth it in the end.

Last edited by Manx; 11/15/17 11:39 am.

1966 Rickman Metisse (a65)
1960 A10 golden flash
1960 lambretta li150
1942 Ariel W/ng
#715191 - 11/15/17 12:45 pm Re: A65 a pain to start [Re: Manx]  
Joined: Aug 2001
Posts: 3,399
gavin eisler Online content
BritBike Forum member
gavin eisler  Online Content
BritBike Forum member

Joined: Aug 2001
Posts: 3,399
argyll. scotland, uk
Was it not already converted to end feed? unusual to see a big bore that hasnt had this done.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
#715215 - 11/15/17 3:15 pm Re: A65 a pain to start [Re: gavin eisler]  
Joined: Sep 2016
Posts: 85
Manx Offline
BritBike Forum member
Manx  Offline
BritBike Forum member

Joined: Sep 2016
Posts: 85
Norway
Nope, Unfortunatly no conversion on my bike.


1966 Rickman Metisse (a65)
1960 A10 golden flash
1960 lambretta li150
1942 Ariel W/ng
#715271 - 11/15/17 9:04 pm Re: A65 a pain to start [Re: Manx]  
Joined: Apr 2005
Posts: 1,581
Adam M. Online content
BritBike Forum member
Adam M.  Online Content
BritBike Forum member

Joined: Apr 2005
Posts: 1,581
Mississauga, Ontario.
Don't have an experience with 750 either, but comparing my engine with double and one carb, low rev. torque was better with one 28mm carb and Thunderbolt small ports, than on my double carb 32 mm head.
I'm not a fan of enlarging ports, IHMO is very often a gimmick to get more money from the customer.
My engine with a big ports 2 carb head was an embarrassment. Not enough torque to ride in town without messing with gears all the time, couldn't pass 5500 revs on a freeway. I was planning a big block conversion, to have some torque from this engine, but decided first try a small port head ( after Rich B. enthusiastic reviews of his Clubmann ).
With this head I got more engine than I bargained for, big block forgotten completely smile.

#715319 - 11/16/17 7:14 am Re: A65 a pain to start [Re: Manx]  
Joined: Sep 2016
Posts: 85
Manx Offline
BritBike Forum member
Manx  Offline
BritBike Forum member

Joined: Sep 2016
Posts: 85
Norway
Cool, thanks


1966 Rickman Metisse (a65)
1960 A10 golden flash
1960 lambretta li150
1942 Ariel W/ng
Page 3 of 3 1 2 3

Moderated by  Allan Gill, Jon W. Whitley 


Home | Sponsors | Newsletter | Regalia | Calendar | Bike Project | BritBike Museum | Spiders Cartoons | "OLD" BritBike Forum | DVD- Manuals & Parts books | BritBike Stickers & Decals
Upgrade to: Premium Membership | Premium Life Membership | Vendor Membership | Site Sponsor Membership
UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.494s Queries: 16 (0.025s) Memory: 0.9546 MB (Peak: 1.2535 MB) Zlib disabled. Server Time: 2017-11-19 21:49:44 UTC