• Husqvarna Motorcycles Made In Sweden - About 1988 and older

  • Hi everyone,

    As you all know, Coffee (Dean) passed away a couple of years ago. I am Dean's ex-wife's husband and happen to have spent my career in tech. Over the years, I occasionally helped Dean with various tech issues.

    When he passed, I worked with his kids to gather the necessary credentials to keep this site running. Since then (and for however long they worked with Coffee), Woodschick and Dirtdame have been maintaining the site and covering the costs. Without their hard work and financial support, CafeHusky would have been lost.

    Over the past couple of weeks, I’ve been working to migrate the site to a free cloud compute instance so that Woodschick and Dirtdame no longer have to fund it. At the same time, I’ve updated the site to a current version of XenForo (the discussion software it runs on). The previous version was outdated and no longer supported.

    Unfortunately, the new software version doesn’t support importing the old site’s styles, so for now, you’ll see the XenForo default style. This may change over time.

    Coffee didn’t document the work he did on the site, so I’ve been digging through the old setup to understand how everything was running. There may still be things I’ve missed. One known issue is that email functionality is not yet working on the new site, but I hope to resolve this over time.

    Thanks for your patience and support!

Boost bottle science explained

Very good explanation! Boast bottle work yes!, but only for certain RPM & each one has to be designed
for a specific motor & are NOT universal. He also really drives home the fact that there's a lot of design
involved in getting one to work.


They worked on my Yamaha 77 RD400, cause it had a flat spot @ 4K, & that's the only reason it work on that
motor.

Wish I had this guy as a science teacher in school, love his bloody accent too... :applause:
 
what ruwfo said^^^^^^^^^

I think there is a problem there but the answer isn't a boost bottle.

This guy is good I like his other videos.

I've called out motorcycle engineers on their design mistakes already.
 
Thanks for posting. This guy is great, "you finally get moving and someone slams a valve in your face... ah ya bastard!" His explanation of the pressure wave as a change in molecule density in the air was awesome. I had never understood that in relationship to the same thing being expressed as a sine wave. Brilliant.

Have looked at the stock boost bottle / resonator chamber on my 1985 KX500 for years, wondering how that funky long tube and wierd shaped plastic chamber could do any damn thing. Makes much better sense now. (In 86 KX5 got a KIPS power valve and nixed the resonator)
 
Thank god I don't have to understand the science behind a boost bottle in order to enjoy dirt bike riding otherwise I would have had to take up collecting stamps or something.
 
So, I've an 82 Yamaha IT175J with such equipment mounted. Completely stock configuration. I removed the unit to see the effect. On this particular vehicle it seems to have a very noticeable change to the lower end of the mid-band. Definitely a flat spot there where the power delivery is non-linear. Put it back on and the power delivery is markedly better as the bike transitions into the mid-range power. This model also enjoys a strange shaped hollow box attached to the air box. Something acoustically going on for sure. This seems to make the power delivery more similar to that of a lectron powered bike. No strong power band hit; just smooth linear delivery. Neat stuff!
 
motojason said:
Thanks for posting. This guy is great, "you finally get moving and someone slams a valve in your face... ah ya bastard!" His explanation of the pressure wave as a change in molecule density in the air was awesome. I had never understood that in relationship to the same thing being expressed as a sine wave. Brilliant.

Have looked at the stock boost bottle / resonator chamber on my 1985 KX500 for years, wondering how that funky long tube and wierd shaped plastic chamber could do any damn thing. Makes much better sense now. (In 86 KX5 got a KIPS power valve and nixed the resonator)
Click to expand...

WTH did they call that?
 
YEIS...Yamaha Energy Induction System...went soon after in favour of the YPVS....the best one was the YDIRTHOS....I saw this sticker on a 82 it 465 once and had to ask....:lol:
 
troy deck said:
WTH did they call that?
Click to expand...


I dont think Kawasaki gave the boost bottle a name / acronym. There were no stickers or print marketing for it in 85. I think that was the only year it was on the KX5 from the factory. Was probably a stop gap since the power valve was in the works by then.
 
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