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Re: UPDATE - UPDATE TIME [Re: Semper Gumby] #769460 03/28/19 10:28 am
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Mike Baker Offline
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Bill, A simple piece of sheetmetal can be bent up fairly easily. Put a diaper of sorts in there and wire it on securely. Mine fits between the pipes and frame and the CS lugs are still in place.
Y'all are killing me though. Got me all excited about this year, lots of new competition, yadda yadda.......
It's ok , a B50 has found it's way onto my lift. I'll go somewhere else if you guys don't want to play :] :] :]

Still can't believe a BSA is in my garage

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Re: UPDATE - UPDATE TIME [Re: Mike Baker] #769462 03/28/19 11:04 am
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pushrod tom Offline
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Use the CS brackets as mounting points eh? PRT

Re: UPDATE - UPDATE TIME [Re: Mike Baker] #771215 04/16/19 2:50 pm
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Semper Gumby Offline OP
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The CS brackets may have to come off.

Ah a lovely BSA in the Garage eh wot Mike?
I knew you would come around eventually!

Sheet metal? Of course!

Ace Hardware?

Last edited by Semper Gumby; 04/16/19 2:56 pm.

"Don't trust your eyes if your imagination is out of focus." - Mark Twain
Re: UPDATE - UPDATE TIME [Re: Semper Gumby] #771372 04/18/19 11:27 am
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pushrod tom Offline
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SG, Are you bringing the Hornet up to NJ in May? PRT

Re: UPDATE - UPDATE TIME [Re: Mike Baker] #771452 04/19/19 1:51 am
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koncretekid Online Content
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Originally Posted by Mike Baker
Bill, A simple piece of sheetmetal can be bent up fairly easily. Put a diaper of sorts in there and wire it on securely. Mine fits between the pipes and frame and the CS lugs are still in place.
Y'all are killing me though. Got me all excited about this year, lots of new competition, yadda yadda.......
It's ok , a B50 has found it's way onto my lift. I'll go somewhere else if you guys don't want to play :] :] :]

Still can't believe a BSA is in my garage


So, a B50! Are you planning to run Sportsman? Good on you and good luck. A good rider on a B50 is exciting. Even I could put a hole shot on the pack, but couldn't keep it up.

O.T.


Life's uncertain - go fast now!
Re: UPDATE - UPDATE TIME [Re: pushrod tom] #771526 04/19/19 7:12 pm
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Semper Gumby Offline OP
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Originally Posted by pushrod tom
SG, Are you bringing the Hornet up to NJ in May? PRT


Yes! Gotta get yellow shirt removed.

Last edited by Semper Gumby; 04/19/19 8:05 pm.

"Don't trust your eyes if your imagination is out of focus." - Mark Twain
Re: UPDATE - UPDATE TIME [Re: Semper Gumby] #771606 04/20/19 11:21 am
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Mike Baker Offline
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Can't think of a better way to spend the holiday weekend! You coming up with Beno?

Trying like crazy to get the "new" B 50 ready. Kid- I'm just going to run it in lightweight production for now. See how it goes, see what it needs, go from there. It's 100% stock MX motor complete with the factory installed compression reducing plate so don't think I'll be setting any speed records this time.

Maybe that Kevin Roberts guy will surprise us and be there too!

Last edited by Mike Baker; 04/20/19 11:23 am.
Re: UPDATE - UPDATE TIME [Re: Mike Baker] #771610 04/20/19 1:38 pm
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I don't have my old AHRMA rulebook with me, but will they allow you to use 18" wheels with the B50SS front brake with the B50MX 32mm carb? I also know that you have to have the handlebars mounted to original mounts, but can you use cafe handlebars?


Life's uncertain - go fast now!
Re: UPDATE - UPDATE TIME [Re: Semper Gumby] #771628 04/20/19 6:30 pm
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Mike Baker Offline
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18" front wheel, 8" conical brake and clubman bars. It's got the right stuff.
Rules say stock carb. It's got a 32mm. Have to wonder if it matters when the port is 30mm?
Now just needs a rider to put it all together.

Re: UPDATE - UPDATE TIME [Re: Mike Baker] #771643 04/20/19 8:38 pm
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kevin roberts Online Confused
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Originally Posted by Mike Baker
18" front wheel, 8" conical brake and clubman bars. It's got the right stuff.
Rules say stock carb. It's got a 32mm. Have to wonder if it matters when the port is 30mm?
Now just needs a rider to put it all together.


pics or it didn't happen.


every day you do not take a chance is a day of your life that you will never get back.
Re: UPDATE - UPDATE TIME [Re: Mike Baker] #771659 04/21/19 12:03 am
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Jerry Roy Offline
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Originally Posted by Mike Baker
It's got a 32mm. Have to wonder if it matters when the port is 30mm?
.



I read somewhere that when BSA engineers were testing the Gold Star during development, they installed an inch and one half carb on a head that was ported for an inch and three eights carb.
They found that it increased the power out put by a measurable degree. It was even better than when the port had been enlarged to match the carb.
I'm guessing that the turbulence created by the step put the fuel that was in the stagnant air next to the walls back into the air stream. Just my guess.
I wouldn't worry about it.
JR

Re: UPDATE - UPDATE TIME [Re: Semper Gumby] #771681 04/21/19 12:11 pm
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Mike Baker Offline
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I've heard that story too, Jerry. I'm just taking all the parts out of the boxes and assembling something that resembles a race bike. First step is to make it run. Race tuning comes later.

Kevin, my patience with posting pictures here went away a long time ago. I appreciate the site, not the cumbersome photo posting process. So, to you, if you want to see the bike, get yer butt to a race! :]

Re: UPDATE - UPDATE TIME [Re: Semper Gumby] #771923 04/24/19 9:53 pm
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every day you do not take a chance is a day of your life that you will never get back.
Re: UPDATE - UPDATE TIME [Re: Semper Gumby] #771946 04/25/19 11:28 am
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pushrod tom Offline
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So, you have been to the plumbers convention? Cheers, PRT

Re: UPDATE - UPDATE TIME [Re: Jerry Roy] #772044 04/26/19 6:15 pm
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Allan Gill Offline
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Originally Posted by Jerry Roy
Originally Posted by Mike Baker
It's got a 32mm. Have to wonder if it matters when the port is 30mm?
.



I read somewhere that when BSA engineers were testing the Gold Star during development, they installed an inch and one half carb on a head that was ported for an inch and three eights carb.
They found that it increased the power out put by a measurable degree. It was even better than when the port had been enlarged to match the carb.
I'm guessing that the turbulence created by the step put the fuel that was in the stagnant air next to the walls back into the air stream. Just my guess.
I wouldn't worry about it.
JR



Not quite but almost, then apprentice was sent to get a 1 3/16 and brought back a 1 3/8 carb. It wasn't checked but jetted to suit. The bike made good power they then opened up then post to match the carb and lost more power than they started with before the "wrong carb incident" they then sleeved the head and eventually added a taper, according to the Roland Pike Memoirs.

I doubt it has anything to do with stagnant fuel sticking to the port wall, you get this more with shiny ports. It'll be more to do with the reduction of the port increasing the swirl of the gas as the pressure changes (negative pressure under vacuum) if you compare A65 ports to a early 60's bonnie, the port on the bonnie has a taper, least more of one than the A65 which is virtually parallel and is parallel on the 30mm ports I've checked.


beerchug
Re: UPDATE - UPDATE TIME [Re: Semper Gumby] #772683 05/05/19 4:41 am
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Mark Parker Online Content
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The thing with the Bonneville to A65 port comparison worth bearing in mind is that both have low ports, virtually at the same angle, however the BSA has a shallower valve angle by I think 10degrees, better for the combustion chamber but bad for a straight approach from the low port at the valve, aiming across the valve not down onto the back, so air can flow past. Why a Commando head can flow 123cfm (with smaller valve) to the A65s stock 109cfm, (rather than 134-140cfm with a rectified port shape no bigger than stock.)


mark
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