Hey old tymers. Tell me about the BASS

Dirtydeeds
Edited Date/Time 3/19/2022 4:28am
What was this all about??? Did it even work?




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flarider
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flarider 3/17/2022 3:54pm
3/17/2022 3:54pm
If I remember right, everyone disconnected or ignored it
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lostboy819 3/17/2022 4:20pm
3/17/2022 4:20pm
When you landed from a big jump and your foot would push down on the brake pedal it would blow threw the rest of the shock travel and you would feel it through the top of your helmet you would bottom so hard. It was made for braking bumps but it was best to disconnect it all together.
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RaceFace58
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RaceFace58 3/17/2022 4:20pm
3/17/2022 4:20pm
Imagine having a term coined about your bikes….”Yamahop” Too funny
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The Shop

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motorick5052
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motorick5052 3/17/2022 4:40pm
3/17/2022 4:40pm
B rake
A ctuated
S uspension
S ystem

If my memory serves correctly it came out in the 1985 YZ’s?
(It could have been 84, tho it’s really inconsequential, as it was gone within a year or two anyway! I know my 1983 YZ didn’t have it, and if it was still on my brother's 1986 YZ we just disconnected it!)

The theory was that when you stepped on the brake pedal it would change the valving and be more compliant in braking bumps etc, but if you had a tendency to drag your rear brake it would cause the shock to run the wrong/softer valving at the worst time, or as someone else already mentioned, if you accidentally stepped on the brake pedal at the wrong time, (over a jump etc) you would bottom out violently enough to rattle your fillings loose!

Almost everyone I knew just disconnected it and ran the shock in a traditional setup!
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Ozy
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Ozy 3/17/2022 4:41pm
3/17/2022 4:41pm
I was expecting a thread about VOLBASS and how much 4stroke motocross bikes suck pigs ass
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flarider
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flarider 3/17/2022 5:11pm
3/17/2022 5:11pm
Ozy wrote:
I was expecting a thread about VOLBASS and how much 4stroke motocross bikes suck pigs ass
Actually, so was I
BAD10
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BAD10 3/17/2022 5:17pm
3/17/2022 5:17pm
Dirtydeeds wrote:
What was this all about??? Did it even work? [img]https://p.vitalmx.com/photos/forums/2022/03/17/538611/s1200_FF7A4CA1_906B_47C5_9741_1C3C19953537.jpg[/img] [img]https://p.vitalmx.com/photos/forums/2022/03/17/538612/s1200_A381223D_70FE_451D_9848_EDE6AE833D26.jpg[/img]
What was this all about??? Did it even work?




It went the way of the Boost Bottle and Roost Boost. Good idea in theory but didn’t work as well in the real world.
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Dirtydeeds 3/17/2022 5:33pm
3/17/2022 5:33pm
Dirtydeeds wrote:
What was this all about??? Did it even work? [img]https://p.vitalmx.com/photos/forums/2022/03/17/538611/s1200_FF7A4CA1_906B_47C5_9741_1C3C19953537.jpg[/img] [img]https://p.vitalmx.com/photos/forums/2022/03/17/538612/s1200_A381223D_70FE_451D_9848_EDE6AE833D26.jpg[/img]
What was this all about??? Did it even work?




BAD10 wrote:
It went the way of the Boost Bottle and Roost Boost. Good idea in theory but didn’t work as well in the real world.
Oh yeah I remember seeing roost boost ads when I was a kid. What was that again?
flarider
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flarider 3/17/2022 5:59pm
3/17/2022 5:59pm
Dirtydeeds wrote:
What was this all about??? Did it even work? [img]https://p.vitalmx.com/photos/forums/2022/03/17/538611/s1200_FF7A4CA1_906B_47C5_9741_1C3C19953537.jpg[/img] [img]https://p.vitalmx.com/photos/forums/2022/03/17/538612/s1200_A381223D_70FE_451D_9848_EDE6AE833D26.jpg[/img]
What was this all about??? Did it even work?




BAD10 wrote:
It went the way of the Boost Bottle and Roost Boost. Good idea in theory but didn’t work as well in the real world.
Dirtydeeds wrote:
Oh yeah I remember seeing roost boost ads when I was a kid. What was that again?
Roost boost was like a small empty bottle between the carb and intake.

Idea was "extra fuel" was stored in that empty bottle and then sucked out during the intake stroke, resulting in "extra fuel" in the cylinder.
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lostboy819 3/17/2022 6:04pm
3/17/2022 6:04pm
BAD10 wrote:
It went the way of the Boost Bottle and Roost Boost. Good idea in theory but didn’t work as well in the real world.
Dirtydeeds wrote:
Oh yeah I remember seeing roost boost ads when I was a kid. What was that again?
flarider wrote:
Roost boost was like a small empty bottle between the carb and intake. Idea was "extra fuel" was stored in that empty bottle and then sucked...
Roost boost was like a small empty bottle between the carb and intake.

Idea was "extra fuel" was stored in that empty bottle and then sucked out during the intake stroke, resulting in "extra fuel" in the cylinder.
Nope, that was the boost bottle, the roost boost was the aftermarket spark enhancement device.
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Dirtydeeds 3/17/2022 6:05pm
3/17/2022 6:05pm
lostboy819 wrote:
Nope, that was the boost bottle, the roost boost was the aftermarket spark enhancement device.
How’d that work?
lostboy819 3/17/2022 6:13pm
3/17/2022 6:13pm
lostboy819 wrote:
Nope, that was the boost bottle, the roost boost was the aftermarket spark enhancement device.
Dirtydeeds wrote:
How’d that work?
They didnt. Laughing Laughing Laughing
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sumdood
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sumdood 3/17/2022 6:14pm
3/17/2022 6:14pm
lostboy819 wrote:
Nope, that was the boost bottle, the roost boost was the aftermarket spark enhancement device.
Dirtydeeds wrote:
How’d that work?
Curious as well cause I don't know one person who bought one
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lostboy819 3/17/2022 6:16pm
3/17/2022 6:16pm
They were suppose to enhance the spark for better throttle response just like the boost bottles. We sold a bunch of them as with most snake oil devices of the day. Wink
sumdood
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sumdood 3/17/2022 6:30pm
3/17/2022 6:30pm
Yeah I thought they were supposed make a bigger spark, like going from 110 to 220 Laughing



Anyone able to tell the difference between regular and Splitfire spark plugs ? I noticed the price difference but that was about it lol
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hartebreak
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hartebreak 3/17/2022 6:51pm
3/17/2022 6:51pm
What about the Amplink?
inthebadboycorner 3/17/2022 7:08pm
3/17/2022 7:08pm
lostboy819 wrote:
They were suppose to enhance the spark for better throttle response just like the boost bottles. We sold a bunch of them as with most snake...
They were suppose to enhance the spark for better throttle response just like the boost bottles. We sold a bunch of them as with most snake oil devices of the day. Wink
Isn't it funny how the term snake oil is seen as a scam , where in reality it was a really effective Chinese medicine.
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JAFO92
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JAFO92 3/17/2022 7:30pm
3/17/2022 7:30pm
motorick5052 wrote:
B rake A ctuated S uspension S ystem If my memory serves correctly it came out in the 1985 YZ’s? (It could have been 84, tho...
B rake
A ctuated
S uspension
S ystem

If my memory serves correctly it came out in the 1985 YZ’s?
(It could have been 84, tho it’s really inconsequential, as it was gone within a year or two anyway! I know my 1983 YZ didn’t have it, and if it was still on my brother's 1986 YZ we just disconnected it!)

The theory was that when you stepped on the brake pedal it would change the valving and be more compliant in braking bumps etc, but if you had a tendency to drag your rear brake it would cause the shock to run the wrong/softer valving at the worst time, or as someone else already mentioned, if you accidentally stepped on the brake pedal at the wrong time, (over a jump etc) you would bottom out violently enough to rattle your fillings loose!

Almost everyone I knew just disconnected it and ran the shock in a traditional setup!
I had a '85 with that crap on it. It was disconnected. This was the bike when I got it.




JAFO92
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JAFO92 3/17/2022 7:43pm
3/17/2022 7:43pm Edited Date/Time 3/17/2022 7:44pm
As I recall back then I had a Nokia flip phone with no camera and had to take pictures with an actual oldschool digital camera,,, so dont have many pics of the resto I did on that bike. But you can can kinda make it out in these








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ocscottie
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ocscottie 3/17/2022 8:20pm
3/17/2022 8:20pm
83 YZ's had the boost bottle stock. I had a YZ80, you can see it in this pic:


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mxshot
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mxshot 3/17/2022 8:40pm
3/17/2022 8:40pm
Something I learned many years ago that I found really interesting was that the rear shocks that used the BASS system were produced by SOKI, YAMAHA's suspension factory. They produced all the MONOCROSS Monoshock components on MONOSHOCK YZs. KAYABA KYB was producing the production front forks but SOKI was the rear shock supplier for years. But I found out that during that production run of the BASS system, the domestic YZs sold in Japan used KAYABA produced BASS shock absorbers! Very strange!
2
Ted722
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Ted722 3/17/2022 8:58pm
3/17/2022 8:58pm
So, let's bring this to today. Is this diagram (on left) somewhat describing what we have with rear discs today? Brake torque transferred to the swing-arm? Is it just a cost/simplicity decision today?

...vs the brake torque transmitted to the frame via brake stay arm..





And a gratuitous Bubba video and his mastery of the rear brake. Less effective if he hit the rear brake in mid-air with the floating rear brake of yesteryear (with brake torque transferred to frame)?


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Chris99Flannery 3/17/2022 10:09pm
3/17/2022 10:09pm
sumdood wrote:
Yeah I thought they were supposed make a bigger spark, like going from 110 to 220 :laugh: [img]https://p.vitalmx.com/photos/forums/2022/03/17/538625/s1200_SPLITFIRE_KAWI.jpg[/img] Anyone able to tell the difference between regular...
Yeah I thought they were supposed make a bigger spark, like going from 110 to 220 Laughing



Anyone able to tell the difference between regular and Splitfire spark plugs ? I noticed the price difference but that was about it lol
I bought one. Young dumb full of….
2
lostboy819 3/17/2022 11:36pm
3/17/2022 11:36pm
sumdood wrote:
Yeah I thought they were supposed make a bigger spark, like going from 110 to 220 :laugh: [img]https://p.vitalmx.com/photos/forums/2022/03/17/538625/s1200_SPLITFIRE_KAWI.jpg[/img] Anyone able to tell the difference between regular...
Yeah I thought they were supposed make a bigger spark, like going from 110 to 220 Laughing



Anyone able to tell the difference between regular and Splitfire spark plugs ? I noticed the price difference but that was about it lol
Chris99Flannery wrote:
I bought one. Young dumb full of….
Dont feel bad, I have bought most "go fast parts" and everything else that I thought would give me the edge even after I new better. I am a advertisers dream target. Blush
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Robgvx
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Robgvx 3/18/2022 1:10am
3/18/2022 1:10am
lostboy819 wrote:
Nope, that was the boost bottle, the roost boost was the aftermarket spark enhancement device.
I knew someone who mounted a second boost bottle, ‘working off the exhaust’…

It was all BS, just to psyche out the completion. He welded a 6mm bolt to the pipe, and ran a hose to the bottle.
2
flarider
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flarider 3/18/2022 3:09am
3/18/2022 3:09am
Dirtydeeds wrote:
Oh yeah I remember seeing roost boost ads when I was a kid. What was that again?
flarider wrote:
Roost boost was like a small empty bottle between the carb and intake. Idea was "extra fuel" was stored in that empty bottle and then sucked...
Roost boost was like a small empty bottle between the carb and intake.

Idea was "extra fuel" was stored in that empty bottle and then sucked out during the intake stroke, resulting in "extra fuel" in the cylinder.
lostboy819 wrote:
Nope, that was the boost bottle, the roost boost was the aftermarket spark enhancement device.
Got my boosts mixed up
1
reded301
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reded301 3/18/2022 6:00am
3/18/2022 6:00am
sumdood wrote:
Yeah I thought they were supposed make a bigger spark, like going from 110 to 220 :laugh: [img]https://p.vitalmx.com/photos/forums/2022/03/17/538625/s1200_SPLITFIRE_KAWI.jpg[/img] Anyone able to tell the difference between regular...
Yeah I thought they were supposed make a bigger spark, like going from 110 to 220 Laughing



Anyone able to tell the difference between regular and Splitfire spark plugs ? I noticed the price difference but that was about it lol
Chris99Flannery wrote:
I bought one. Young dumb full of….
lostboy819 wrote:
Dont feel bad, I have bought most "go fast parts" and everything else that I thought would give me the edge even after I new better...
Dont feel bad, I have bought most "go fast parts" and everything else that I thought would give me the edge even after I new better. I am a advertisers dream target. Blush
I didn’t see anyone finishing any better after bragging about their Splitfire so I stuck with $2 NGK’s.
1

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