BSA B50 -500 APG Build

[DND]

Hi Tom

Well done with your new record, and keeping the shiny up with your ride off course.

Was there in the 60's and always saw the center line, seems very strage now with out it.

I guess the people who pull the strings on the salt are more concerned about future trees growing there in a million years, instead of getting the pumping going to save it now!!

Like a thin black line is really going to do any damage to the salt, wow i can't believe the thinking nowdays.

Don

[JimL]

Wow...that is very strong.  Maybe your schedule will allow Speedweek next year?  It would be fun to visit, there, and I'm sure you can put some mileage on the current record.

Really well done, this year.  I was there in '69 when a pretty fresh/strong Manx put in a 126 record, and you've raised the bar.

JimL

[Old Scrambler]

Congradulations Tom

Yes to a centerline.......even if it has to be veggie-green

[DND]

Only ever saw the black one , but a green line would work and make all the tree huggers very happy too

[Nortonist 592]

Congratulations on great runs!!  Strong motor to say the least.  Would love to see it at SpeedWeek. 

[Koncretekid]

Here are a couple more photos of my bike after impact with a flagpole.  You can see the green smudge which may have been the green flag.  My air intake took the brunt of it, cutting off the flagpole.  The lower part of the fairing  took a hit and you can see where it abraded the paint and the gel coat.  Also, there is a small crack in the windshield which we tried to repair with crazy glue.

The second photo shows the pieces of the flagpole that we found in the bottom of the fairing that blew out thru the back of the cooling air intake.  About 4 of the windshield screws broke off as well.

Some words of wisdom from Bo Miller (Wobbly Walrus): "When you start your run, try to memorize the horizon"  For me it was the left edge of Floating Mountain.  I paid very close attention to this and the flags in subsequent runs, concentrating on staying in the center at every set of flags.  A line on the salt would be welcome.

Tom

[Glen]

The black line issue has been discussed at length before on this web site. The big reason was the cost was trippled and the additional courses added more. The tree huggers were happy and it's pro & con on the lines by the racer. any complaints should be directed to SCTA/BNI.

[wobblywalrus]

That is a very good record, Tom.  Those engines were originally designed for a 250cc utility type bike.  It is amazing to see what you have done with one.

[Koncretekid]

Motor rebuild is now in progress, as well as cool air induction system.

First photo shows ease of removal of motor from frame.  Remove lefthand motormounts  which leaves bottom bolt requiring lowering of fairing to remove.  Also shown is the "Beat" suggested outboard bearing mounting plate hold down screws, complete with lockwire still in place.  No more screws backing out here!

Also shown is piston, head, and rod bearings, all of which look usable, but I am going to install new rod bearing.  

The new 20 tooth sprocket shown is not available for the B50 motor, but this one is machined down from an A65 BSA (650 twin) motor, and just fits thru the cases.  I had to clearance the cases ahead of the chain to allow the use of this larger sprocket.  This sprocket will get me over 140 mph with the rear sprockets I have.

[Koncretekid]

more photos

[wobblywalrus]

Tom, it looks like you need to go to a bigger diameter rear wheel to get into the 150 club.  Your piston sure looks better than my pair.  They were a bit loose.

[Old Scrambler]

Tom.....do I see a bit of valve damage along the upper edge of the intake?  Also looks a little on the lean side of things.

I am building a new T20 motor for my Cub centered around a different primary gear ratio in order to spin the tranny faster....much in the same fashion as your attempting....I'll be watching for your final ratios........good luck 8-) 8-)

[Koncretekid]

Regarding final gear ratio, with the 20 tooth front sprocket, 42, rear, and a 23-1/2" diameter tire, I calculate I can go 152 mph at Loring, Me. at 8500 RPM, no slippage.  At Bonneville, with 4% slippage, 146 mph, 151 at 8800 rpm.  That should do it, if I have the hp and can make myself a little smaller. There's always nitrous oxide.....

Dennis, Yes you can see exhaust valve damage on the piston.  That is the result of the overrev I got at Loring when the primary chain broke.  It also bent the valve, pushrod, and tappet.

Tom

[Koncretekid]

I thought this comparison was interesting.  My fairing started out as a copy of the Canam one, with severe modifications.  And I'm almost as fast as a Canam 125, now!

[bak189]

Outstanding speed....for the "old" single........maybe get a air and/or elec.
shifter.....might keep you off the flag poles......Congrats.......................