Fast & Far - Ridding My 1964 Yamaha YA6. Part 1

guzzirider

Well-known member
The first thing I need to do is establish my definition of “fast” and “far”.
Fast is not a number on a display but a feeling.
I have ridden modern large touring bikes at higher speeds that did not give you a sense of adventure.
I also recondition vintage small bore motorcycles and some of them are scary at lower speeds.
My definition of fast is determined by the “pucker factor”.
If you need a definition of that, it can be described as a lower portion of the anatomy migrating upward toward the heart.

And now to my definition of “far”.
I my younger days, 800 to 1400 km in a day was not unheard of.
To my dismay my firm round buttocks (an ex girlfriend once described my face as only a 6 but my ass was a solid 9) is now migrating towards my knees.
Add to this a bladder that seems to be much smaller than it used to be now dictates distance I can travel on a tank of gas is no longer as important.
A long day for me now is 350 kilometres.

This brings me to my next point, and you must understand this MY PERSONAL OPINION and don’t care if you disagree with me.
“Riding old slow motorcycles fast is more fun than driving new fast motorcycles slow.”

To get on with the story, it is about my travels on a 1964 Yamaha YA6 125cc two stroke.
It was acquired in 2010 and shipped from Wasaga Beach area to Edmonton Alberta.

YA6-1.jpg

In 2012 while at the Ponoka Rally for vintage bikes I heard about the First Annual Rocky Mountain Motogiro.
I had a 1971 Yamaha L5TA at the rally and left it with the organizer of the motogiro to deliver to Nelson BC for the second weekend of September.
The 1971 Yamaha was 100cc two stroke with a 3 speed dual range transmission.
The scoring was based on being the closest to the actual time to cover the distance at the posted speed limit.
We all proceeded to ride wide open throttle all the time.
Having the second slowest motorcycle resulted in me winning a 2nd place trophy.
Some of the grades where challenging for the L5TA so I decided I needed a much bigger displacement motorcycle for the 2013 event.

IMG_1425.JPG

Upon returning home I had a look at what bikes I owned as to potential for the 2013 Rocky Mountain Motogiro.
Since the 250cc class was dominated by Italian bikes that where very expensive to buy, build and maintain I decided to stick with the 125cc class.
Besides I like electric start!
The YA6 became the obvious choice and it did have a whole 12.5 horsepower.
I proceeded to do a frame-up rebuild keeping the bike as stock as possible.

YA6 frame-1.jpg

YA6-11.jpg

YA6-25a.jpg

The rotary valve was trimmed for more power (1/4 to 1/2 hp).
Unfortunately 3/4 thru the build I was informed of a venue change.
For the second Rocky Mountain Motogiro it would be a 2 day event with an actual road race on day 2.
Saturday was now a qualifying event from Nakusp, Nelson, Kaslo, New Denver and back to Nakusp. (309 km)
On Sunday the Nakusp Hot Springs road would be closed for 5 hours for us to do a Pike’s Peak type run. (10.4 km)
Sunday was the only timed event with 125cc class getting a credit on time against the 250cc class.
The YA6 was great for Saturday but being built as a “touring bike” was not the best for Sunday.

Rocky Mountain Motogiro.png

YA6 Nakusp.jpg
Down hill into a decreasing radius corner, poor suspension, marginal brakes and short wheel base doing 110 kph acording to my GPS

On my way home from Nakusp to Edmonton I had to pick up parts for other bikes in Sweet Grass Montana.
I was transporting my bike in a rented van that was not allowed to cross the border so I unloaded the YA6 in Couttes Alberta.
Road the YA6 to Sweet Grass and back to Couttes
The USA customs guy was amused and asked how often I had to feed the squirrel.

YA6-29.jpg

Just to explain motogiro:

2015 Rocky Mountain Motogiro video

Too be continued!
 
My first bike was a Yam 125 about the same age. Heavy for it's cc's it had a oil injection system that was cam driven off the engine and the cam lift was determined by the throttle setting, more throttle, more lift, more oil.

It worked OK but, once and a while, the engine would seize under high load creating a different type of sphincter moment. It turned out that a roll pin was missing and the cam was only turning by friction between it and the shaft. I developed the habit of a finger on the clutch lever as well as the brake.

I rode the thing all winter learning to handle ice and snow. Dumb, but fun and good learning to handle in iffy situations.
 
The first thing I need to do is establish my definition of “fast” and “far”.
Fast is not a number on a display but a feeling.
I have ridden modern large touring bikes at higher speeds that did not give you a sense of adventure.
I also recondition vintage small bore motorcycles and some of them are scary at lower speeds.
My definition of fast is determined by the “pucker factor”.
If you need a definition of that, it can be described as a lower portion of the anatomy migrating upward toward the heart.

And now to my definition of “far”.
I my younger days, 800 to 1400 km in a day was not unheard of.
To my dismay my firm round buttocks (an ex girlfriend once described my face as only a 6 but my ass was a solid 9) is now migrating towards my knees.
Add to this a bladder that seems to be much smaller than it used to be now dictates distance I can travel on a tank of gas is no longer as important.
A long day for me now is 350 kilometres.

This brings me to my next point, and you must understand this MY PERSONAL OPINION and don’t care if you disagree with me.
“Riding old slow motorcycles fast is more fun than driving new fast motorcycles slow.”

To get on with the story, it is about my travels on a 1964 Yamaha YA6 125cc two stroke.
It was acquired in 2010 and shipped from Wasaga Beach area to Edmonton Alberta.

View attachment 58441

In 2012 while at the Ponoka Rally for vintage bikes I heard about the First Annual Rocky Mountain Motogiro.
I had a 1971 Yamaha L5TA at the rally and left it with the organizer of the motogiro to deliver to Nelson BC for the second weekend of September.
The 1971 Yamaha was 100cc two stroke with a 3 speed dual range transmission.
The scoring was based on being the closest to the actual time to cover the distance at the posted speed limit.
We all proceeded to ride wide open throttle all the time.
Having the second slowest motorcycle resulted in me winning a 2nd place trophy.
Some of the grades where challenging for the L5TA so I decided I needed a much bigger displacement motorcycle for the 2013 event.

View attachment 58446

Upon returning home I had a look at what bikes I owned as to potential for the 2013 Rocky Mountain Motogiro.
Since the 250cc class was dominated by Italian bikes that where very expensive to buy, build and maintain I decided to stick with the 125cc class.
Besides I like electric start!
The YA6 became the obvious choice and it did have a whole 12.5 horsepower.
I proceeded to do a frame-up rebuild keeping the bike as stock as possible.

View attachment 58442

View attachment 58450

View attachment 58444

The rotary valve was trimmed for more power (1/4 to 1/2 hp).
Unfortunately 3/4 thru the build I was informed of a venue change.
For the second Rocky Mountain Motogiro it would be a 2 day event with an actual road race on day 2.
Saturday was now a qualifying event from Nakusp, Nelson, Kaslo, New Denver and back to Nakusp. (309 km)
On Sunday the Nakusp Hot Springs road would be closed for 5 hours for us to do a Pike’s Peak type run. (10.4 km)
Sunday was the only timed event with 125cc class getting a credit on time against the 250cc class.
The YA6 was great for Saturday but being built as a “touring bike” was not the best for Sunday.

View attachment 58451

View attachment 58447
Down hill into a decreasing radius corner, poor suspension, marginal brakes and short wheel base doing 110 kph acording to my GPS

On my way home from Nakusp to Edmonton I had to pick up parts for other bikes in Sweet Grass Montana.
I was transporting my bike in a rented van that was not allowed to cross the border so I unloaded the YA6 in Couttes Alberta.
Road the YA6 to Sweet Grass and back to Couttes
The USA customs guy was amused and asked how often I had to feed the squirrel.

View attachment 58449

Just to explain motogiro:

2015 Rocky Mountain Motogiro video

Too be continued!
I have 69 Triumph 250, and a few early 70s 2 stroke enduros. I wish i could find something like that event here in the GTA.
 
I have 69 Triumph 250, and a few early 70s 2 stroke enduros. I wish i could find something like that event here in the GTA.
The Ganaraska section of the CVMG has a ride in May/June that's similar, I think. Not likely as long though.
 
The Ganaraska 250 is held in Port Hope and surrounding area.
It is a 250km event in classic motogiro format other than having classes for bigger displacement motorcycles.
I have ridden in the event 3 times previously on my 1966 Yamaha YA6 and plan on attending this year with a 1974 Yamaha DT175.
It is a well organized event and I highly recommend it.
IMG_1753.JPG
 
The Ganaraska 250 is held in Port Hope and surrounding area.
It is a 250km event in classic motogiro format other than having classes for bigger displacement motorcycles.
I have ridden in the event 3 times previously on my 1966 Yamaha YA6 and plan on attending this year with a 1974 Yamaha DT175.
It is a well organized event and I highly recommend it.
View attachment 58465
Nice award. I'm rebooting a 75 DT175 right now. Not a concourse resto, I like bringing them back to a sound state or repair and reliability - a little rust, a few dings and scrapes and some patina decorate my oldies.

How important is the beauty factor in one of these events?
 
My philosophy of reconditioning (note I seldom use the word restore) motorcycles is to have them look like they are well cared for but not pristine.
This is not a show&shine event but get out and ride and maybe even get it dirty.
It only needs to be street legal with insurance and registration.
To make yourself competitive you will need an enduro route sheet holder or tank bag with a map pocket and have a functioning trip odometer.
NO GPS
Hope to see you at the event next spring.

IMG_1593.JPG

as purchased
 
My philosophy of reconditioning (note I seldom use the word restore) motorcycles is to have them look like they are well cared for but not pristine.
This is not a show&shine event but get out and ride and maybe even get it dirty.
It only needs to be street legal with insurance and registration.
To make yourself competitive you will need an enduro route sheet holder or tank bag with a map pocket and have a functioning trip odometer.
NO GPS
Hope to see you at the event next spring.

View attachment 58468

as purchased
Have the same bike, looks to be in similar condition with the exception of a non-authentic red respray, fork gaiters, and an aftermarket front fender. Mine still has the OE turn signals but no luggage rack.

I changed cables, head and wheel bearings, chain, bulbs (LEDs all around), front fender (aftermarket -- couldn't resto the folded plastic OE), swingarm bushings, and battery. Cleaned up some wiring, deep cleaned oil injection pump and lines, carb, and speedo drive. Speedo drive was a bear -- rusted solid.

I had no trouble finding parts at reasonable prices. All I'm missing is a shifter cover plate, I blew it up when trying to press out a worn bushing.
 
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