Texas Two Step Taco

Texasstar

Can't is a four letter dirty word
“Dad you can’t build a Drag bike out of the Bultaco in 4 weeks.” So my now 15 year old know it all son Zeke took his hard earned summer money and bought a 93 Ducati 900ss. It looks like the Sausage Creature. He wants to take it to the Twist Off in Texas this November.

Last year we were fairly matched at the event with me on the Lucky our cb200 and Zeke on the Bultaco 360. Zeke was handicapped because the taco required extra foot work to shift since the gear shifter lever was not set at the middle of the throw.

So I am looking for a little speed to compete with the youngin’ this year.
a71eb270d7feb5fd929f4546f5e5d2a5.png



We will race grass sprints in the morning, barrel race 50cc bikes, and then drag race on an 1/8 mile at night.


Sent from my iPhone using Tapatalk
 
So here is what we are starting with an m51 Bultaco
0d1b2abea5910944b9c3420b5d1c518b.jpg
the goal is to allow it to return to its original state minus some weight off the flywheel.
6d7db54745b4e1808596d4d32c0c7918.jpg



Sent from my iPhone using Tapatalk
 
You may ask yourself well why Texas two step taco? Well a wise man once told me it was all about optimization and having fun. So can we build a Drag bike and a Grass Tracker out of the same bike and race it in two different events on the same day and complete it in a four week time frame?

The goal is to use as many of the existing components as possible minus a swing arm. Keep the Beto forks, 21” akront front wheel, 18” rear wheel. Maybe add a reed valve, flatslide, air shifter, slicks, and beat Zeke.


Sent from my iPhone using Tapatalk
 
Would really like to know who built this Bultaco Drag Bike
c06aee0400c1f33fa6d7bdb5d49b6008.jpg
6324bbfec64c9bfcdb5ff92e1dfb086f.png



Sent from my iPhone using Tapatalk
 
Damn - when I grow up I want to be just like Zeke. Wait - no. That doesn't work at all. But, damn. What an introduction that kid's having. Lucky guy!
 
The Jimbonaut said:
Damn - when I grow up I want to be just like Zeke. Wait - no. That doesn't work at all. But, damn. What an introduction that kid's having. Lucky guy!
And a hard worker. He worked all summer in the Texas heat fixing sprinkler systems and saved all his money to buy HIS first motorcycle. Very proud of him.


Sent from my iPhone using Tapatalk
 
Lowering the 35mm Beto Bultaco forks is accomplished by removing the dampener, disassembling and installing an internal spacer as shown. Two things make sure the snap ring is seated behind the head of the dampener and always use loctite when assembling to the lower fork tube.
cea40a2d583880d61db7efeb18b8dd2c.jpg



Sent from my iPhone using Tapatalk
 
Ok we took a spin on Sunday with the front end lowered for our Bultaco Drag bike. Bandido frame and Montadero engine.
8503d4dcb05095281fa638189fac8b3f.png



Sent from my iPhone using Tapatalk
 
Removed 2 lbs off the 8 lbs flywheel. However we are taking the mag and rotor off our ds80 Suzuki’s to test it.
54373f9b91373f809e0ab90be019dfe7.jpg
2ebcdb299b6eb4b23c63bd4a0b9426eb.jpg
376d8e4f7edc46608e72dcf05894dff8.jpg
dcc94ef007a56bbe381b4fce06b427ba.jpg
 
8lbs Bultaco flywheel before 6 lbs after
https://youtu.be/p4fmXjuYaBs


Sent from my iPhone using Tapatalk
 
Zeke inspected the tires we got from Coker Tires a 2.75 X 21” ribbed Firestone and a 4” by 18” M and H Vintage Drag Slick and then wrapped the slick in Saran Wrap
dc47babbccd2ec0bf9369bdab1098457.heic
39934c277b31cbfe053af0ff4dcc8ffa.png
6bb7a234312230df8cb652941826ce9b.png
making sure I don’t have any excuses when he “whoops me”
d2a2fcc007a483f7d82fd954478402d9.jpg



Sent from my iPhone using Tapatalk
 
I have been obsessing over the little things like woodruff keys. Why do I want to pay 5 bucks for a Bultaco woodruff key that is 3mm by 7.5mm but has a 18mm diameter? How did it end up this size? Maybe another OCD er will read this... ask your friends where they get their woodruff keys. I am going to buy a box of 3mm by 9mm by 18mm and hit them on the belt sander. Is that how Bultaco ended up with this size?


Sent from my iPhone using Tapatalk
 
It's possible that the slot is oversize already and if not, a sander will work. All it does is to locate the flywheel.

Are those tires speed rated by any chance?
 
The rear is an S but the Firestone front is not rated. Umm...


Sent from my iPhone using Tapatalk
 
That sure looks like a good time to me.
If you would be interested in sketching up the old and new flywheel dimensions, i’d love to get an accurate comparison of the two inertial moments.
Only if you’re interested.
 
farmer92 said:
That sure looks like a good time to me.
If you would be interested in sketching up the old and new flywheel dimensions, i’d love to get an accurate comparison of the two inertial moments.
Only if you’re interested.
Yes very interested. I will get those dimensions.


Sent from my iPhone using Tapatalk
 
Teazer Tach on a Taco does this seem right?

https://youtu.be/Q2_xJcgCK-4


Sent from my iPhone using Tapatalk
 
Texasstar said:
Teazer Tach on a Taco does this seem right?

https://youtu.be/Q2_xJcgCK-4


Sent from my iPhone using Tapatalk

Was lucky running a wasted spark? (is that an induction tach?)
If not then it’s giving you double the RPM.
 
Back
Top Bottom