BritBike Forum logo
BritBike SponsorBritBike SponsorBritBike SponsorBritBike SponsorBritBike SponsorBritBike SponsorBritBike SponsorThe Bonneville ShopBritBike Sponsor
Upgrade to: Premium Membership | Premium Life Membership | Vendor Membership | Site Sponsor Membership
ShoutChat Box
Comment Guidelines: Do post respectful and insightful comments.
Buy BritBike staff a coffee
Buy BritBike's staff a coffeeStill here since 1996 serving BritBike enthusiasts..
Search eBay for motorcycle parts in following countries
Australia, Canada, France, Holland, Italy, United Kingdom, USA
Random Gallery photo
Member Spotlight
Tiger Dale
Tiger Dale
Waldorf, Maryland
Posts: 305
Joined: December 2007
Show All Member Profiles 
Newest Members
Psychorider, Shedengineering, Shayne Brown, Snow's Cycles, Scottboy
10858 Registered Users
Top Posters(30 Days)
franko 169
reverb 62
NickL 49
Popular Topics(Views)
1,004,143 mail-order LSR
a word from..
Forum Statistics
Forums34
Topics67,695
Posts679,611
Members10,858
Most Online14,755
May 5th, 2019
Who's Online Now
62 registered members (Andrew Dunham), 346 guests, and 899 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Dynamic Balancing shops? #786255 10/05/19 1:54 am
Joined: Sep 2014
Posts: 195
A
Andrew Dunham Online Content OP
BritBike Forum member
OP Online Content
BritBike Forum member
A
Joined: Sep 2014
Posts: 195
I'm coming up on the reassembly of my 61' BSA Super Rocket rebuilt, but I have opted for some more modern bits and would like to have the crank assembly dynamically balanced. MAP cycle connecting rods and GPM pistons.

Does anyone know if a good shop to have this done in the US? In particular, near Ohio would be great.


1961 BSA Super Rocket
1968 BSA A50
1969 BSA 441 VS
1970 BSA Thunderbolt
Support Your #1 BritBike Forum!

Check out British motorcycles for sale:
British Motorcycles on e-Bay UK
British motorcycles on e-Bay North America
Re: Dynamic Balancing shops? [Re: Andrew Dunham] #786279 10/05/19 12:14 pm
Joined: Aug 2001
Posts: 1,608
Al Eckstadt Offline
BritBike Forum member
Offline
BritBike Forum member
Joined: Aug 2001
Posts: 1,608
Could possibly find someone here in Central New York State. There are a few excellent shops that specialize in Brit bikes. I would have to ask about dynamic balancing.


Al Eckstadt
Re: Dynamic Balancing shops? [Re: Andrew Dunham] #786288 10/05/19 1:41 pm
Joined: Jan 2005
Posts: 1,626
Dick Harris Offline
BritBike Forum member
Offline
BritBike Forum member
Joined: Jan 2005
Posts: 1,626
Mcquillen machine shop in Leroy New York has done several Triumph cranks for me, including my 76 degree crank done many years ago. Dick

Re: Dynamic Balancing shops? [Re: Dick Harris] #786353 10/06/19 12:33 pm
Joined: Oct 2012
Posts: 4,583
Hillbilly bike Offline
BritBike Forum member
Offline
BritBike Forum member
Joined: Oct 2012
Posts: 4,583
Originally Posted by Dick Harris
Mcquillen machine shop in Leroy New York has done several Triumph cranks for me, including my 76 degree crank done many years ago. Dick


McQuillen was recomended to me by Dick Harris....The shop balanced two of my race engines and one 750 kitted 650 and a bunch of machine work..McQuillen has state of the art machining equipment and people who know how to use it...They will not tell you what balance factor to use..That's your decision...


79 T140D, 96 900M Ducati ,2001 Sportster....On a bike you can out run the demons..
Re: Dynamic Balancing shops? [Re: Andrew Dunham] #786354 10/06/19 12:40 pm
Joined: Aug 2001
Posts: 2,925
MikeG Offline
BritBike Forum member
Offline
BritBike Forum member
Joined: Aug 2001
Posts: 2,925
I used these guys to do my A10 a few years ago:

http://www.lindskog.com/

One thing I noticed after it was done is that the vibrations are still there, just at a different frequency and RPM range. Where I used to get a lot of handlebar buzz from about 1/4 throttle on, getting worse as RPM climbed, it's now more pronounced in the seat and footpegs and not as harsh. The worst of it does not start till the RPMs are much higher-no tachometer so its just a seat of the pants guess.


1960 BSA A10
2007 Suzuki Bandit
1957 A10
(Used to be a Triumph here)
71 Norton Commando
17 Triumph Bonneville

Re: Dynamic Balancing shops? [Re: Andrew Dunham] #786369 10/06/19 4:30 pm
Joined: Aug 2005
Posts: 1,600
B
bodine031 Offline
BritBike Forum member
Offline
BritBike Forum member
B
Joined: Aug 2005
Posts: 1,600
Ed G Cranks offsetcranks.com 416-347-6936 TIOC vendor

Re: Dynamic Balancing shops? [Re: Andrew Dunham] #786402 10/06/19 11:40 pm
Joined: Sep 2014
Posts: 195
A
Andrew Dunham Online Content OP
BritBike Forum member
OP Online Content
BritBike Forum member
A
Joined: Sep 2014
Posts: 195
Thanks for all the responses everyone. This gets me plenty of options for when I get close to having it done. I am waiting on my new pistons, then they have to go to the machinist to bore the cylinders out. Then I can send it all out for balancing.

MikeG, that makes perfect sense. I know next to nothing about crankshaft balancing at the moment, but learning all the time. It seems like the whole purpose of the dynamic balance is to get the engine to run smoothly at whatever your desired RPM range is. That will be a bit tricky because I only managed 3 miles on this bike before deciding to check the sludge trap and tear the engine down, so I have no idea what RPM is 60-65 mph!

I may have to take a trip up to NY state and talk to McQuillen. That looks like quite the operation.

Last edited by Andrew Dunham; 10/06/19 11:51 pm.

1961 BSA Super Rocket
1968 BSA A50
1969 BSA 441 VS
1970 BSA Thunderbolt
Re: Dynamic Balancing shops? [Re: Andrew Dunham] #786416 10/07/19 12:58 am
Joined: Oct 2001
Posts: 1,153
S
Shane in Oz Online Content
BritBike Forum member
Online Content
BritBike Forum member
S
Joined: Oct 2001
Posts: 1,153
Originally Posted by Andrew Dunham
It seems like the whole purpose of the dynamic balance is to get the engine to run smoothly at whatever your desired RPM range is. That will be a bit tricky because I only managed 3 miles on this bike before deciding to check the sludge trap and tear the engine down, so I have no idea what RPM is 60-65 mph!
You can work that out from the sprocket tooth counts and rear wheel circumference, but it's typically around 3,500 - 4,000 rpm.
How many teeth on:
a/ crankshaft sprocket
b/ clutch chain wheel
c/ gearbox sprocket
d/ rear wheel sprocket

I assume it has a 19" rear wheel, and probably a 3.50 or 4.00 rear tyre.

Re: Dynamic Balancing shops? [Re: Andrew Dunham] #786418 10/07/19 1:11 am
Joined: Mar 2017
Posts: 30
9
99cyclone Offline
BritBike Forum member
Offline
BritBike Forum member
9
Joined: Mar 2017
Posts: 30
One of the best, and specialized in vintage British bikes...

http://richtermachining.com/


Buells and Brit Bikes
Re: Dynamic Balancing shops? [Re: Andrew Dunham] #786419 10/07/19 1:13 am
Joined: Mar 2014
Posts: 681
J
Jerry Roy Online Content
BritBike Forum member
Online Content
BritBike Forum member
J
Joined: Mar 2014
Posts: 681
Since you are in a learning mode, you might find this helpful;

https://www.bing.com/videos/search?...50AB2E38620FF21AA6FB50AB2E&FORM=VIRE

Or, BING "how to figure speed from gear ratio", and spend an hour or two going through the sites until you find something that you can use to figure your speed at whatever RPM you want to cruise at, or vice versa.
You will need to know what ratio your transmission uses for top gear, so if you don't want to take the tranny apart and count teeth, look in a good manual, and see if you can find a chart with the ratios.
Most will have a 1 to 1 top gear ratio.
You can work the math starting from the rear wheel, after figuring out how fast it is turning at your cruising speed. (60 MPH = 1 M/ min. 5280 Ft divided by your rear wheel circumference in feet will tell you the RPM of the wheel at 60 MPH.)
Have fun. crazy

JR

Last edited by Jerry Roy; 10/07/19 1:20 am.
Re: Dynamic Balancing shops? [Re: Andrew Dunham] #786443 10/07/19 9:17 am
Joined: Sep 2007
Posts: 152
D
Douglass Harroun Offline
BritBike Forum member
Offline
BritBike Forum member
D
Joined: Sep 2007
Posts: 152
http://www.countrysidecycle.net/engines.htm

did very good job on my Triumph 650/ almost no vibes anywhere
Doug

Re: Dynamic Balancing shops? [Re: Andrew Dunham] #786498 10/07/19 8:08 pm
Joined: Nov 2005
Posts: 7,561
JubeePrince Offline
Born To Run
Offline
Born To Run
Joined: Nov 2005
Posts: 7,561
John Healy has always spoken highly about this shop:

https://www.memphismotorwerks.com/

Steve


'77 T140J
"Vintage Bike". What's in your garage?

"The paying customer is always right."

Fitting round pegs into square holes since 1961...
Re: Dynamic Balancing shops? [Re: Andrew Dunham] #786501 10/07/19 8:28 pm
Joined: Mar 2005
Posts: 10,250
J
John Healy Offline
BritBike Forum member
Offline
BritBike Forum member
J
Joined: Mar 2005
Posts: 10,250
Steve this is not the type of work they do


Re: Dynamic Balancing shops? [Re: Andrew Dunham] #786517 10/08/19 12:34 am
Joined: Nov 2005
Posts: 7,561
JubeePrince Offline
Born To Run
Offline
Born To Run
Joined: Nov 2005
Posts: 7,561
They stick to strictly valve and head work then?


'77 T140J
"Vintage Bike". What's in your garage?

"The paying customer is always right."

Fitting round pegs into square holes since 1961...
Re: Dynamic Balancing shops? [Re: Andrew Dunham] #786684 10/10/19 2:44 am
Joined: Sep 2014
Posts: 195
A
Andrew Dunham Online Content OP
BritBike Forum member
OP Online Content
BritBike Forum member
A
Joined: Sep 2014
Posts: 195
Thanks everyone. I contacted Richter and they seem confident like they could do the job well. I'll pursue that route a little further and see how it goes.


1961 BSA Super Rocket
1968 BSA A50
1969 BSA 441 VS
1970 BSA Thunderbolt
Re: Dynamic Balancing shops? [Re: JubeePrince] #786698 10/10/19 11:43 am
Joined: Oct 2012
Posts: 4,583
Hillbilly bike Offline
BritBike Forum member
Offline
BritBike Forum member
Joined: Oct 2012
Posts: 4,583
Originally Posted by JubeePrince
They stick to strictly valve and head work then?

Ask Kevin Roberts on this site...he sent in a head and it's been over a year, maybe two years and they didn't get to it..There are a few others with similar stories..


79 T140D, 96 900M Ducati ,2001 Sportster....On a bike you can out run the demons..
Re: Dynamic Balancing shops? [Re: Hillbilly bike] #786792 10/11/19 1:37 pm
Joined: Nov 2005
Posts: 7,561
JubeePrince Offline
Born To Run
Offline
Born To Run
Joined: Nov 2005
Posts: 7,561
Wow.....he (MMW) must be spending too much time playing bass guitar!

Last edited by JubeePrince; 10/12/19 11:10 pm. Reason: clarity

'77 T140J
"Vintage Bike". What's in your garage?

"The paying customer is always right."

Fitting round pegs into square holes since 1961...

Moderated by  Alan_nc 

Home | Sponsors | Newsletter | Regalia | Calendar | Bike Project | BritBike Museum | Spiders Cartoons | DVD- Manuals & Parts books
Upgrade to: Premium Membership | Premium Life Membership | Vendor Membership | Site Sponsor Membership
Powered by UBB.threads™ PHP Forum Software 7.7.3