Britbike forum

Classic British SparesKlempf British PartsBaxter CycleBritBike Sponsor SteadfastCyclesThe Bonneville ShopLowbrow CustomsGirling Classic MotorcycleLucas Classic MotorcycleHepolite PistonsIndustrial tec supply Classic Bike Parts Cheshire

Upgrade Your membership! Premium Membership Gold Membership Vendor Membership

New Sponsor post
July 4th Sale at The Bonneville Shop
by The Bonneville Shop - 07/01/22 6:26 pm
New FAQ post
Member Spotlight
Dave Comeau
Dave Comeau
Hamilton, Mass. USA
Posts: 1,722
Joined: August 2001
ShoutChat
Comment Guidelines: Do post respectful and insightful comments. Don't flame, hate, spam.
Top Posters(30 Days)
quinten 67
kevin 64
DavidP 56
Top Likes Received (30 Days)
Lannis 23
MikeG 21
Newest Members
Ash Cav, MartyH, Steve Sewell UK, BrokenLeg, Jeff Keller
12,213 Registered Users
Who's Online Now
5 members (dave j, zambu, Morgan aka admin, George Kaplan, machico), 10 guests, and 22 robots.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums35
Topics76,557
Posts776,503
Members12,213
Most Online204
Jul 10th, 2022
Previous Thread
Next Thread
Print Thread
Page 9 of 9 1 2 3 4 5 6 7 8 9
NickL #883181 06/17/22 2:05 pm
Joined: Apr 2005
Posts: 3,078
Likes: 135
M
Britbike forum member
Offline
Britbike forum member
M
Joined: Apr 2005
Posts: 3,078
Likes: 135
Ben's 734 is a thing. Adjusted the mixture a bit and a quick spin before dark. Dropped the needles and swapped the bowls for some drilled to supply the power jets? Same 34 carbs from the same place? It's still rich cruising but full noise looks like 12.9 - 1 rather than 14+ but hard to get a look when it's trying to pick the wheel up in second. The power is so strong, and you are just thinking wow.

I ordered a steering damper for it. The engine is right forward but the front gets really light. I don't want it provoking bad behavior. It's more than fast enough for me. I opened it going slow in second, it's just so nice. Wish you could have a go on it Nick. And the cam is std profile. I don't know what it's like above 6,500 - 7,000 but it's pulling very hard into that area.

I'd love to know what hp it's getting. I could fit offset rocker buttons for .410" lift but it would shift power up the rpm a bit. It definitely goes harder than with the 38mm, in midrange and into higher rpm. The thing would have been so fun in the '70s-80s. It has that sharp throttle response.

Nice machining on that bearing plate and support. It makes it harder for cranks to flex I expect. Hope it kicks butt. And all stays together.


mark
1 member likes this: JER.Hill
British motorcycles on eBay
NickL #883209 06/17/22 11:14 pm
Joined: Jan 2014
Posts: 2,173
Likes: 376
N
NickL Offline OP
Britbike forum member
OP Offline
Britbike forum member
N
Joined: Jan 2014
Posts: 2,173
Likes: 376
You wouldn't want me to have a go on it Mark, you'd probably never see it again........

From what you say the new engine we are sorting at the moment should be along
the same lines, i'm really looking forward to getting on with it but we have had a few
setbacks and as you know delays all add up.
Fitting the existing/refurbed engine/gearbox tomorrow as the winter meeting is now
only 2 weeks away.
Heated the gearchange setup/timing cover in my bar b que to around 80 deg and found
what was going on. Nothing to do with the actual gearbox, it was the pawls and quadrant,
i replaced the pawl springs and dressed them a little then ground a small amount from the
granny tooth that runs on the return spring, then fitted a better stronger return spring.
The culmination of that lot is a change similar to that of a late late one, i'm now happy with it.
I'm so glad he's going to use late cases on his new motor.................................lol

2 members like this: gavin eisler, JER.Hill
NickL #883436 06/21/22 9:22 am
Joined: Apr 2005
Posts: 3,078
Likes: 135
M
Britbike forum member
Offline
Britbike forum member
M
Joined: Apr 2005
Posts: 3,078
Likes: 135
I made a test adapter for the crank end nearing mount. The Norton spigot nut winds onto one crank ok but not the one we are using yet. The adapter has a washer on the inside and fits over the spigot of the nut so the washer spaces from the alternator rotor. I'll fit the nut and spacer and put a dial indicator on it when it's together and make sure it's running true. It needs to be exact if there is no movement. It just sat on a spacer before. If it's ridged and wrong it wouldn't be good.

The big hex is the washer.

[Linked Image from i.postimg.cc]


mark
NickL #883518 06/22/22 5:57 am
Joined: Jan 2014
Posts: 2,173
Likes: 376
N
NickL Offline OP
Britbike forum member
OP Offline
Britbike forum member
N
Joined: Jan 2014
Posts: 2,173
Likes: 376
That looks like a neat solution Mark.


Nick

NickL #884171 06/29/22 4:19 am
Joined: Jan 2014
Posts: 2,173
Likes: 376
N
NickL Offline OP
Britbike forum member
OP Offline
Britbike forum member
N
Joined: Jan 2014
Posts: 2,173
Likes: 376
We are all set for the weekend but it looks like it's going to be raining, bugger!

Ran up last Saturday and seems good, no leaks from the welded repairs etc.
Float level seems good and stable and should be ok with the fitted regulator,
although until it's on the track it's hard to say. I've put the jetting back to a
sensible set up ready to test in practise. Don't think there will be many there
so it'll be a good setting up scene for the Qld titles at Morgan Park. Some more
mods to the frame have been done but we know there are one or two things
that will need adjustment, toe-in etc. I also put new rings in as the bores needed
a fair amount of honing so they'll need bedding in, hopefully the filters he's fitted
will stop the crap getting in.
Hoping for the best, and wishing for a dry weekend............,.lol.

Nick

1 member likes this: JER.Hill
NickL #884276 06/29/22 11:47 pm
Joined: Sep 2016
Posts: 23
Likes: 1
B
Britbike forum member
Offline
Britbike forum member
B
Joined: Sep 2016
Posts: 23
Likes: 1
All the best for race day Nick. Dry weather will suit us as well. Trying to get back my summer sun tan 😎

NickL #884347 06/30/22 2:35 pm
Joined: Apr 2005
Posts: 3,078
Likes: 135
M
Britbike forum member
Offline
Britbike forum member
M
Joined: Apr 2005
Posts: 3,078
Likes: 135
Invite some kids from a high school to take some video Nick. Schools have classes and good gear. If it's a bit late now invite video students to the titles, talk to their teacher. Good gear means good lenses and stuff. Combine that with on board and interviews etc would be a great thing to have. What we miss are great races that were not put down on film. There is a great video called power bikes I think about Peter Williams and others at the IOM. It would be a great student project, to make something similar, and I'm sure they would enjoy it.

The thing about sidecar racing is it's a team sport, and it would be most interesting having an interview with the passenger as well as the throttle man. Because of how parts of a good team work. What racing these rigs was like 60 years ago. It would actually be a great way to sell bikes if they were still manufactured and you had a streak of wins like 2020-21 causing that major upset.



mark
NickL #884640 07/03/22 11:03 pm
Joined: Jan 2014
Posts: 2,173
Likes: 376
N
NickL Offline OP
Britbike forum member
OP Offline
Britbike forum member
N
Joined: Jan 2014
Posts: 2,173
Likes: 376
A good weekend , it rained a little Saturday but not heavy, Sunday was lovely.
The handling is well sorted now, bike is steering very well we are pleased
with that. Bike still jumped out of third a few times but engine performed well,
not well enough to beat the big norton but he was on his tail at all the corners
and was pushing him, he just has a lot of straight line speed, about $8000.00
worth more than Matt's bike. All his brand new Molnar cases, crank etc are
bound to beat a 62 a65 with an a10 crank in it. I think when we get the 5 speed
box in it may be a different storey, Matt can out brake and out corner him anywhere
and the advantage of higher corner speed accompanied by better drive out will
even things up quite a lot. Anyway there were 6 races, 2nd in all of them.

2 members like this: JER.Hill, Mark Parker
NickL #884654 07/04/22 2:17 am
Joined: Apr 2005
Posts: 3,078
Likes: 135
M
Britbike forum member
Offline
Britbike forum member
M
Joined: Apr 2005
Posts: 3,078
Likes: 135
And AMCN would like to do a spread and feature Nick. You do not happen to have any idea of the Norton's hp? Do you know if they dynoed it? Or are there secrets? I cleared some messages out before.

Oh yes, brilliant by the way, well done.

We are talking about a (920 edit) actually 850, on methanol, and a 745 on petrol. I'm sure that can be evened up even so. It certainly makes it more fun having competition.

Nigel Rollason ran his best engine without a head gasket. Extra bearing where the alternator goes controlling end float and one behind the chain wheel and never any problem with the primary.

This is what compression does, the red one is 12-1 the others 11-1. Heads are 38mm and not flowing much. I haven't run 12-1 with the good head on the 883. I expect it would do the same and then some as it will keep revving.
Tony Price used 11.5-1.

This is same gearing, same piece of bitumen. More comp and around 155cfm. Acceleration. Top end is nothing like now but shows that waiting being fixed.

[Linked Image from i.postimg.cc]

I don't know where your compression is but if you are just 10-1 or something it isn't very high. And maybe you could match the Norton on hp and drive. If it didn't blow up smile

Last edited by Mark Parker; 07/04/22 10:15 am.

mark
NickL #884717 07/04/22 11:24 pm
Joined: Jan 2014
Posts: 2,173
Likes: 376
N
NickL Offline OP
Britbike forum member
OP Offline
Britbike forum member
N
Joined: Jan 2014
Posts: 2,173
Likes: 376
Compression is around 10.2-1 but anymore will need the piston pockets deepened
as initially i did have a little valve contact. The barrel was skimmed 30 thou and the
pistons are 10.5-1 A70 venolia's and there is no base gasket. As you know, the valves
are pocketed a little in that head.
. I hear what you're saying Mark and yes, i know we
can go higher, but not with that crank IMHO. It just won't last, i've seen a few 'let go'
with those A10 cranks and i'm a little paranoid about it. My old thing was over 11-1 but
the norton crank is much stronger especially when offset. The bike will idle easily so i
know there's room for improvement but i have to be realistic, that crank is 60+ years old!

Last edited by NickL; 07/04/22 11:27 pm.
NickL #884731 07/05/22 3:06 am
Joined: Apr 2005
Posts: 3,078
Likes: 135
M
Britbike forum member
Offline
Britbike forum member
M
Joined: Apr 2005
Posts: 3,078
Likes: 135
It's a real credit to you guys to get it to do what it does. Not blowing stuff up is definitely the trick. I have an old rusted A10 crank on .040" under and rusted I don't think it's good for anything. Not when Chris can get a std one welded to 84mm stroke. My friend did that in Melbourne as well but a bit longer stroke.

With a base gasket you have to adjust tappets, same with not venting into the primary, you have to check it has oil sometimes. It's bad enough they wear tyres out for me.


mark
1 member likes this: NickL
NickL #884736 07/05/22 4:55 am
Joined: Jan 2014
Posts: 2,173
Likes: 376
N
NickL Offline OP
Britbike forum member
OP Offline
Britbike forum member
N
Joined: Jan 2014
Posts: 2,173
Likes: 376

NickL #884745 07/05/22 11:35 am
Joined: Apr 2005
Posts: 3,078
Likes: 135
M
Britbike forum member
Offline
Britbike forum member
M
Joined: Apr 2005
Posts: 3,078
Likes: 135
The thing looks brilliant.

[Linked Image from i.postimg.cc]


mark
3 members like this: A65Matt, JER.Hill, kevin
NickL #884759 07/05/22 2:07 pm
Joined: Aug 2001
Posts: 519
Likes: 8
K
Britbike forum member
Offline
Britbike forum member
K
Joined: Aug 2001
Posts: 519
Likes: 8
NickL - did you build the hydraulic front brake ? Do rules prevent a disk brake ?


1968 BSA Firebird
1200 Sportster
XS 1100
1972 Rickman 125
NickL #884817 07/05/22 11:32 pm
Joined: Jan 2014
Posts: 2,173
Likes: 376
N
NickL Offline OP
Britbike forum member
OP Offline
Britbike forum member
N
Joined: Jan 2014
Posts: 2,173
Likes: 376
The front brakes are early BMC Mini sls running in triumph drums.
It was a fairly common thing in UK back in the day.
The rear is a later 2ls mini complete with drum.
Plenty of guys had hydraulic brakes on sidecars back in the day,
but to keep people happy we use a cable operated front master
cylinder. We are not allowed to link the brakes even though lots
of sidecars had linked brakes pre-62. We have a sidecar brake but
are not allowed to use it so it's isolated by a valve. Once again lots
of sidecars had brakes back in the day, it's just stupid aussie rules,
basically as no-one in Victoria has them, no- one else can.
We are not allowed disc brakes pre-62. Period 3 which is what the bike is.
Funny, you can run 9 + 10 stud triumph crap with 5 speed boxes etc
or any aftermarket norton and triumph engines that didn't exist pre-2000
but you can't link your brakes...... daft eh?

3 members like this: A65Matt, konon, JER.Hill
NickL #887596 08/06/22 4:02 am
Joined: Jan 2014
Posts: 2,173
Likes: 376
N
NickL Offline OP
Britbike forum member
OP Offline
Britbike forum member
N
Joined: Jan 2014
Posts: 2,173
Likes: 376
Well, after a little deliberation i ordered a 20 thou head gasket from Lani at Copper
Gaskets Unlimited. It arrived the other day (took less than 2 weeks) and is a lovely job.
The fit around the studs is really good and general quality is excellent. It was only a few
dollars more than a standard one (plus post of course) but what a difference in quality!
Thanks to Trevor (WM20) for the recommendation, will definitely use them again.
Managed to find a set of 3 piece oil rings from an early 750 trumpet (75mm) so will fit
those as well. The Venolia forged pistons need 3 piece oil rings really as they use 8 thou
clearance, Standard one piece ones tend to make it smoke a little.
So after cutting a little more from the piston inlet pockets we should have around 11-1 now.
Not measured yet but it's one on the 'to-do' list.
5 speed box is in and 8 plate 3 spring clutch with my old SRM pressure plate and some decent
springs. All seems good, we will see..........................

1 member likes this: JER.Hill
NickL #887601 08/06/22 8:24 am
Joined: Jun 2013
Posts: 124
Likes: 2
P
PEH Offline
Britbike forum member
Offline
Britbike forum member
P
Joined: Jun 2013
Posts: 124
Likes: 2
Do you use the pressure plate with the needle bearing push rod adapter?

NickL #887654 08/07/22 1:11 am
Joined: Jan 2014
Posts: 2,173
Likes: 376
N
NickL Offline OP
Britbike forum member
OP Offline
Britbike forum member
N
Joined: Jan 2014
Posts: 2,173
Likes: 376
Yes it's one i bought from Gary at SRM about 30 years ago.
I also bought a few spare bits and pieces for those pressure
plates at swap meetings over the years so i have a few of
the radial bearings and end stubbs/pushers.
I tried a set of my old 'Gorilla springs' in the clutch but it was
bloody heavy so i just put some t120 springs in. It runs very
close to the cover with the extra plates so the springs have
to be almost flush, With a set of my old ones in there you
almost need two hands to operate it lol. I had a special/funny
clutch lever/cable arrangement on my old crate and even then
after using it for a while i could strangle crocs with my left hand.

Last edited by NickL; 08/07/22 1:14 am.
Joined: Apr 2005
Posts: 3,078
Likes: 135
M
Britbike forum member
Offline
Britbike forum member
M
Joined: Apr 2005
Posts: 3,078
Likes: 135
If you had 10.2 and took 1/2mm off in gasket height it would mean a chamber of 36.4cc reduced to 34.19 and give about 10.89-1. But what it is you would have to measure. It may be there are some hp hiding in there that a dyno could find as well. They make me nervous but it may be worth finding all you can. And you need to test the gear box.

Having a dyno curve tells you what stuff is doing like exhaust. It would give something to compare with a short stroke version as well. Which can run more comp.

I might get them to make me a copper base gasket I just need to measure comp on a motor. I think the cases face has been machined a bit or something, pistons are a little bit above the deck of a Devimead cylinder. A syringe isn't quite accurate but it seemed quite high.

Either way if this restores parity it should be really fun.


mark
Joined: Jan 2014
Posts: 2,173
Likes: 376
N
NickL Offline OP
Britbike forum member
OP Offline
Britbike forum member
N
Joined: Jan 2014
Posts: 2,173
Likes: 376
A dyno run and a test day at a track is what's needed but i doubt it'll happen.

My crude/prelim measurements give just under 11-1 so it must have been higher
than i thought before. Using a vet syringe, i thought it was fitting for the old dog.............
Doing the sums,,,, 84mm stroke, 10.5-1 pistons (with 85mm stroke)
So 30 thou off the barrel + say 8 for the base gasket, now another 20 thou = 58 thou
If we are not at or near 11-1 i would be very surprised.

Messy job.......couple of blokes i used to know used condoms to contain the oil
but i don't think it was any easier or less messy.
Still waiting for the oil rings from the 'states.

Joined: Jan 2014
Posts: 2,173
Likes: 376
N
NickL Offline OP
Britbike forum member
OP Offline
Britbike forum member
N
Joined: Jan 2014
Posts: 2,173
Likes: 376
Just measured the old head gasket at 43-44 thou.

Page 9 of 9 1 2 3 4 5 6 7 8 9

Moderated by  Allan G 

Link Copied to Clipboard
British Cycle SupplyMorries PlaceKlempf British PartsBSA Unit SinglesPodtronicVintage MagazineBritBike SponsorBritish Tools & FastenersBritBike Sponsor






© 1996-2022 britbike.com
Powered by UBB.threads™ PHP Forum Software 7.7.5