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Author Topic: Solo to Sidecar by STD  (Read 67730 times)
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tauruck
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« Reply #300 on: September 10, 2016, 03:48:16 PM »

Exactly Bo.
Good to hear you had a great time Bruin. cheers cheers
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« Reply #301 on: September 10, 2016, 04:16:42 PM »

I started with a 17-45 ratio and ran 137+ in 5th (overdrive)............switched to 17-43 and ran a 140 in 4th smiley smiley
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2011 AMA Record - 250cc M-PG TRIUMPH Tiger Cub - 82.5 mph
2013 AMA Record - 250cc MPS-PG TRIUMPH Tiger Cub - 88.7 mph
2016 AMA Record - 750cc M-CG HONDA CB750 sohc - 130.7 mph
2016 AMA Record - 750cc MPS-CG HONDA CB750 sohc - 137.7 mph
Chasis Builder / Tuner: Dave Murre
Bruin
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« Reply #302 on: September 11, 2016, 09:57:58 AM »

I'm currently running a 14/42 front/back combo. I can barely get to 5th by the timing gate and it flattens out around 6,800 rpm and 90 mph. I think I need to run in 4th. Mathematically I can reach the desired speed (90-100 at 7,000-8,000 rpm) with a 16/40 combo. It is taller gearing and assumes 4th can pull it.
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STD; Speed Team Doo
'82 Honda 500 APS-AF
'70 Triumph 250 MPS-PG
'71 Triumph 250 APS-PF
'70 Triumph 250 M-PG
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« Reply #303 on: September 12, 2016, 09:59:04 AM »

I think your onto something..............Do you lean slightly to the left to 'lighten' the sidecar wheel drag?
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2011 AMA Record - 250cc M-PG TRIUMPH Tiger Cub - 82.5 mph
2013 AMA Record - 250cc MPS-PG TRIUMPH Tiger Cub - 88.7 mph
2016 AMA Record - 750cc M-CG HONDA CB750 sohc - 130.7 mph
2016 AMA Record - 750cc MPS-CG HONDA CB750 sohc - 137.7 mph
Chasis Builder / Tuner: Dave Murre
Bruin
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« Reply #304 on: September 12, 2016, 10:47:40 AM »

I can't lean much in my semi-prone position and my center of gravity is so low it's actually hard to fly the hack without turning. But its something to think about. One lesson I learned this year was that riding the 15 miles of cobblestone rough to-and-from track roads was a bone shaker. Not much good on the bike either. The front end would shimmy and shake like a hula girl. So last night I lowered the triple tree down the tubes a couple inches (bottom rail still within the center bubble mark on the level) to take some 'slack' out of the long forks and rigged a fork brace across the lower ends. It will handle better since I had too much trail to start with.
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STD; Speed Team Doo
'82 Honda 500 APS-AF
'70 Triumph 250 MPS-PG
'71 Triumph 250 APS-PF
'70 Triumph 250 M-PG
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« Reply #305 on: September 12, 2016, 01:32:29 PM »

and you will be an inch or more LOWER grin
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2011 AMA Record - 250cc M-PG TRIUMPH Tiger Cub - 82.5 mph
2013 AMA Record - 250cc MPS-PG TRIUMPH Tiger Cub - 88.7 mph
2016 AMA Record - 750cc M-CG HONDA CB750 sohc - 130.7 mph
2016 AMA Record - 750cc MPS-CG HONDA CB750 sohc - 137.7 mph
Chasis Builder / Tuner: Dave Murre
Stan Back
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« Reply #306 on: September 12, 2016, 03:00:43 PM »

Yeah -- but the air is thicker down lower.
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Celebrating 65th anniversary of racing on the salt.
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« Reply #307 on: September 13, 2016, 10:25:41 AM »

I'm still jazzed from BMST and started improving the bike for next year. The cobblestone like roads to the track were a real bone and bike shaker. So I rigged a home-made fork trace to tame a little of the fork wobble. It looks like fender will fit over it with a little creative trimming.


* 14316957_10208924474702293_1478036267901714506_n.jpg (89.86 KB, 960x720 - viewed 64 times.)

* 14291914_10208924475262307_9159623669090652340_n.jpg (103.11 KB, 960x720 - viewed 69 times.)
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STD; Speed Team Doo
'82 Honda 500 APS-AF
'70 Triumph 250 MPS-PG
'71 Triumph 250 APS-PF
'70 Triumph 250 M-PG
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« Reply #308 on: September 16, 2016, 10:37:40 AM »

I finally got around to breaking down my carburetor post BMST '16. When I last ran in '14 I dumped about a teaspoon of salty crystalline crud out of the bowl. (Same on my wife's bike.) I never did hear a satisfactory explanation for it. Granted it was sloppy wet all that week. This year it was bone dry, even the boat ramp was dry. This year there was only the smallest pinch of salt. Could be because it was nice and dry, could be because I drained the bowl and sprayed gum-out into the works a couple times through the week.
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STD; Speed Team Doo
'82 Honda 500 APS-AF
'70 Triumph 250 MPS-PG
'71 Triumph 250 APS-PF
'70 Triumph 250 M-PG
Peter Jack
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« Reply #309 on: September 16, 2016, 12:32:57 PM »

Is it salt or is the result of aluminum corrosion. Some gasoline additives will give you a white crystalline sludge and alcohol will give it to you big time if you don't purge the system after use.

Pete
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Bruin
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« Reply #310 on: September 16, 2016, 05:18:41 PM »

I can only say it looked like dirty salt with big crystals like you see at Bonnie. A good teaspoon full in the carbs on both bikes. I don't use alcohol fuel per say, I used the race gas from the gas man on the track. A few others have reported the same thing.
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STD; Speed Team Doo
'82 Honda 500 APS-AF
'70 Triumph 250 MPS-PG
'71 Triumph 250 APS-PF
'70 Triumph 250 M-PG
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« Reply #311 on: September 16, 2016, 05:32:04 PM »

I have the same 'crystals' in my bowls............I attribute them to particulate-salt that enters the tank through the breather vent. I had significant amounts in 2014 because my vent tube lead to the hollow steering stem.........which was filled with salt after a few runs with a too-small fender. This year we had a much better fender and inserted a filter in the stem resulting in minimal 'crystals' smiley
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2011 AMA Record - 250cc M-PG TRIUMPH Tiger Cub - 82.5 mph
2013 AMA Record - 250cc MPS-PG TRIUMPH Tiger Cub - 88.7 mph
2016 AMA Record - 750cc M-CG HONDA CB750 sohc - 130.7 mph
2016 AMA Record - 750cc MPS-CG HONDA CB750 sohc - 137.7 mph
Chasis Builder / Tuner: Dave Murre
Bruin
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« Reply #312 on: September 16, 2016, 10:08:58 PM »

Vent... That is as good an explanation as I have heard. Though in '14 I ran a closed loop fuel pump system. But of course the cap was vented. Tucker ran a standard gravity feed with the same results. I half wonder if the gas truck was contaminated.
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STD; Speed Team Doo
'82 Honda 500 APS-AF
'70 Triumph 250 MPS-PG
'71 Triumph 250 APS-PF
'70 Triumph 250 M-PG
55chevr
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« Reply #313 on: September 17, 2016, 06:46:21 AM »

I always get salt crystals in the corners of the float bowl.  I assume that it is drawn in by low pressure in the float bowl.
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« Reply #314 on: September 17, 2016, 10:47:53 AM »

BTW............my bowl vent tubes are connected to the air-cleaner box.........
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2011 AMA Record - 250cc M-PG TRIUMPH Tiger Cub - 82.5 mph
2013 AMA Record - 250cc MPS-PG TRIUMPH Tiger Cub - 88.7 mph
2016 AMA Record - 750cc M-CG HONDA CB750 sohc - 130.7 mph
2016 AMA Record - 750cc MPS-CG HONDA CB750 sohc - 137.7 mph
Chasis Builder / Tuner: Dave Murre
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