Author Topic: new BS owner Michigan. 100cc race bike.  (Read 11596 times)

0 Members and 1 Guest are viewing this topic.

Offline jbm

  • Trade Count: (0)
  • Registered Bridgestone Member
  • **
  • Posts: 19
new BS owner Michigan. 100cc race bike.
« on: July 10, 2012, 07:35:01 PM »
hello!
I'm in Michigan, and I just bought a nicely patinated and pretty complete TMX 100. I have been looking for a 100 to build into an inexpensive class killer(100cc 2t/125 4t) for our local concrete banked 1/4 mile oval.
 http://thunderdrome.com/
this is not my first bike. I've mostly been building/restoring vintage italian bikes for a few years, but couldn't find something that would compete with modern bikes in some pretty limiting classes. so i did my research, and the tmx 100 looks like it will be VERY competitive with modern bikes, and parts availability seems to be very good.
my initial plan is to follow most of the tuning tips that are documented in the bridgestone tuning guide, but i would love some input into whether or not all of the information in that guide is viable and accurate. Any additional tips would be much appreciated!
thanks,
jeff



 


 


Offline old smokey

  • Trade Count: (0)
  • Master Registered Bridgestone Member
  • *****
  • Posts: 685
Re: new BS owner Michigan. 100cc race bike.
« Reply #1 on: July 10, 2012, 07:52:45 PM »
Hi Jeff,
Welcome to the site. I can't offer any help on the TMX100, but if one turned up close to home at a good price I would consider getting it for going around the neighborhood.
'67 350 GTR undergoing repairs with a '75 Yamaha TX500 front end

Offline Bikenstein

  • Trade Count: (0)
  • Master Registered Bridgestone Member
  • *****
  • Posts: 787
  • I Hate Electronic Ignition!
Re: new BS owner Michigan. 100cc race bike.
« Reply #2 on: July 10, 2012, 08:19:31 PM »
Welcome to the site, Jeff. Looks like you guys have a blast at the Drome. I think you chose a good bike. I'd love to see some videos of your TMX racin' on that track when you get it runnin.. Do they still make PBR?
keep it between the ditches

Offline jbm

  • Trade Count: (0)
  • Registered Bridgestone Member
  • **
  • Posts: 19
Re: new BS owner Michigan. 100cc race bike.
« Reply #3 on: July 10, 2012, 09:11:55 PM »
yep. they still sell PBR, and I still buy it.

Offline Mike Anderson

  • Trade Count: (0)
  • Master Registered Bridgestone Member
  • *****
  • Posts: 826
Re: new BS owner Michigan. 100cc race bike.
« Reply #4 on: July 11, 2012, 05:47:50 AM »
Hi,
Welcome to the site. Did you buy the TMX that was for sale on e-bay over the weekend? It looked like a pretty nice bike. Good Luck
Later Mike

Offline jbm

  • Trade Count: (0)
  • Registered Bridgestone Member
  • **
  • Posts: 19
Re: new BS owner Michigan. 100cc race bike.
« Reply #5 on: July 11, 2012, 07:53:38 AM »
yes. the one in wisconsin, not the one in michigan. ebay #330758060803
« Last Edit: July 11, 2012, 07:55:09 AM by jbm »

Offline scrambler

  • Trade Count: (0)
  • Expert Registered Bridgestone Member
  • ****
  • Posts: 276
    • Scrambler Cycle
Re: new BS owner Michigan. 100cc race bike.
« Reply #6 on: July 11, 2012, 08:37:19 AM »
I have to admit I am jealous of Thunderdrome.


Offline rocketman

  • Global Moderator
  • Trade Count: (2)
  • *******
  • Posts: 470
Re: new BS owner Michigan. 100cc race bike.
« Reply #7 on: July 12, 2012, 05:06:08 PM »
 Worthwhile project Jeff.   Unless you have a lot of spares, I would recommend staying closer to the factory stock side.  A good expansion chamber, fabricated or store bought is a must. Concentrate on compression, carb tuning and timing. The competition tuning manual is pretty basic and time tested by now so I feel confident that if you stick to it closely and don't go overboard cutting everything up, you should be good with the results. Whatever you do, do not overcut the rotary valve and keep in mind modifications can rob the bike of lower end. EZ does it.  Thanks, Mark.

Offline rocketman

  • Global Moderator
  • Trade Count: (2)
  • *******
  • Posts: 470
Re: new BS owner Michigan. 100cc race bike.
« Reply #8 on: July 12, 2012, 05:09:44 PM »
About your gearing Jeff. I'm pretty sure you want to be able to get high gear. You may have to gear it low enough to leave the line in second. Mark.

Offline jbm

  • Trade Count: (0)
  • Registered Bridgestone Member
  • **
  • Posts: 19
Re: new BS owner Michigan. 100cc race bike.
« Reply #9 on: July 12, 2012, 06:23:21 PM »
thanks for the info. I will be very conservative with the rotary valve mod.
Is there a known good store bought expansion chamber out there that fits this bike?
i was looking at gear ratios, and it shouldnt be an issue of getting this into 4th gear.will probably be bump started in 2nd anyways...

any recommendations on carburetors? the modern vm22 has a flange mount.. the tuning specs mention a 300?! main jet on a vm22.

« Last Edit: July 12, 2012, 06:27:29 PM by jbm »

Offline jbm

  • Trade Count: (0)
  • Registered Bridgestone Member
  • **
  • Posts: 19
Re: new BS owner Michigan. 100cc race bike.
« Reply #10 on: September 01, 2012, 09:12:56 PM »
well, they changed the classes two weeks before the race, which will not allow me to run the 100 TMX.  :'(
so I had to scramble pretty quickly to find something in the barn that would be competitive.
fortunately I had a rusty '64 BS 90 sport in the barn ;D . it's nice to have a barn full of bikes to pick from!
the 90 is now running well.  it started out a "little" rusty. working to make it look a little better, dunno how much i will get done cosmetically before the race.


I will post race pics and pics of the completed bike.

Offline Bikenstein

  • Trade Count: (0)
  • Master Registered Bridgestone Member
  • *****
  • Posts: 787
  • I Hate Electronic Ignition!
Re: new BS owner Michigan. 100cc race bike.
« Reply #11 on: September 01, 2012, 11:54:02 PM »
Man, I'd love to get somethin like that Thunderdrome goin here. I know of Four old tracks within a 30 or 40 mile radius from here that used to be wide open. I guess I could build one on my land, run em around the field then down through the beaver ponds up the hill through the woods and back over the lake dam. Second thought, forget that. I would like to get somethin goin on one of those old tracks though. Looks like good family fun. Any suggestions on gettin people interested? My BS's are a "little" rusty too. Building my shop now so I'll have a good place to work on em.
keep it between the ditches

Offline jbm

  • Trade Count: (0)
  • Registered Bridgestone Member
  • **
  • Posts: 19
Re: new BS owner Michigan. 100cc race bike.
« Reply #12 on: September 02, 2012, 09:38:03 PM »
if you have the land, build it. they will come. the thunderdrome is a velodrome. it's fun, but it only really good to small displacement bikes.
you could easily build this on <5 acres
 

Offline jbm

  • Trade Count: (0)
  • Registered Bridgestone Member
  • **
  • Posts: 19
Re: new BS owner Michigan. 100cc race bike.
« Reply #13 on: September 14, 2012, 01:24:28 PM »
looks a little better now.
good enough for the race.loaded up and ready for tomorrow
« Last Edit: September 14, 2012, 07:48:37 PM by jbm »

Offline Bikenstein

  • Trade Count: (0)
  • Master Registered Bridgestone Member
  • *****
  • Posts: 787
  • I Hate Electronic Ignition!
Re: new BS owner Michigan. 100cc race bike.
« Reply #14 on: September 14, 2012, 08:53:14 PM »
The bike looks great. I'd love to see some video of the races tomorrow. Have fun ;D
keep it between the ditches

Offline jbm

  • Trade Count: (0)
  • Registered Bridgestone Member
  • **
  • Posts: 19
Re: new BS owner Michigan. 100cc race bike.
« Reply #15 on: September 17, 2012, 08:26:22 PM »

Offline Bikenstein

  • Trade Count: (0)
  • Master Registered Bridgestone Member
  • *****
  • Posts: 787
  • I Hate Electronic Ignition!
Re: new BS owner Michigan. 100cc race bike.
« Reply #16 on: September 18, 2012, 11:08:55 AM »
Smokin! Do you have to lean in the turns or do you ride straight up like the bicycles on this track? From what I understand, a velodrome has banked turns so that you ride through at a 90 degree angle to the track. What kind of speed are you gettin out of the 90?
keep it between the ditches

Offline jbm

  • Trade Count: (0)
  • Registered Bridgestone Member
  • **
  • Posts: 19
Re: new BS owner Michigan. 100cc race bike.
« Reply #17 on: November 27, 2012, 01:01:13 AM »
it's a 45 degree bank.very steep.looks scary as a spectator. maybe 20 ft wide. like a mini-taladega . you dont lean into anything. riding it feels flat. trying to get to 50mph(3rd gear). revved out at the top of third gear(screaming). the power loss to shift to 4th with stock sprockets makes 4th gear a no-go. next race will be running a bigger rear sprocket. should make a HUGE difference(ie we'll get into 4th gear, and get up some real speed). hard to prep for the drome on the street. 

 


Gallery


Views:14
Comments (0)
By: harleywaynecycles

Views:16
Comments (0)
By: harleywaynecycles

Views:11
Comments (0)
By: harleywaynecycles

Views:6
Comments (0)
By: harleywaynecycles

Classifieds

[ebay] ‘67 175 DT - no reserve
Price: $0.00
Date: 11/09/2018 10:20 am
Time Left: 86d 11h 47m
Assorted Bridgestone Parts

Price: $0.00
Date: 10/16/2018 11:09 am
Time Left: 62d 11h 35m
BS 350 Carburetors (2nd. Set)(SOLD)

Price: $0.00
Date: 10/04/2018 04:52 pm
Time Left: 50d 17h 18m
1966 DT 175

Price: $1900.00
Date: 09/16/2018 07:14 am
Time Left: 32d 7h 40m

Recent Downloads added

11/01/1967 Factory Service Letter, RH shift/LH Brake conversion

Rating: (None)
Filesize: 92.56KB
Date: August 03, 2018, 02:49:08 AM
11/01/1967 Factory Service Letter, RH shift/LH Brake conversion

Rating: (None)
Filesize: 142.24KB
Date: August 03, 2018, 02:44:36 AM
350 GTR Wiring Diagram
Rating: *****
Filesize: 8604.23KB
Date: July 29, 2018, 12:29:25 PM
Bridgestone Motorcycles

Rating: (None)
Filesize: 3561.91KB
Date: June 05, 2018, 04:42:13 PM

Powered by EzPortal