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[dsn_klr650] nklr-dual carb questions...
Posted: Tue Jun 27, 2000 2:12 pm
by spye@hvgb.net
-----Original Message-----
From: Zachariah Mully
To: KLR650-List DSN_klr650@egroups.com>
Date: Tuesday, June 27, 2000 1:26 PM
2 carbs! Now this piqued my interest... Why would you put
>two carbs on a single cylinder engine?
Zach,
Not sure why, but I've seen it before. My 86' Honda XL 600 had a factory
dual carb set up. Something about better throttle response at low rpm??
Steve Pye
A7
[dsn_klr650] nklr-dual carb questions...
Posted: Tue Jun 27, 2000 2:21 pm
by Swampy
I know Honda did the same back in the 80's. One was for better low speed
mixture and response, and the other was for high speed functions. I don't
know about the Yamaha though, but its probably the same thing......
Swampy
-----Original Message-----
From: Zachariah Mully
To: KLR650-List DSN_klr650@egroups.com>
Date: Tuesday, June 27, 2000 12:25 PM
Subject: [DSN_klr650] NKLR-dual carb questions...
>All-
> I was just reading an article on some motorcycle site (it was y2f.com
>or something, I can't find it again, anyone know this site) about the
>2000 MuZ Skorpion and Black Panther. They both use a Yamaha 660cc 5v
>single with 2 carbs! Now this piqued my interest... Why would you put
>two carbs on a single cylinder engine?
> The only way I could reason this was that there are inefficiencies in
>the mixing and control in large carbs, and having two allowed better
>more precise control. But then I was talking to my brother who is
>rebuilding his 1967 GTO and he was telling me about the huge Holly(?)
>carbs that he got for it, and how I wouldn't believe how large they
>were.... WTF? Obviously high-performance cars of yesteryear didn't seem
>to support my hypothesis, so what gives?
> Not that I am not happy with the KLR engine... I would rather have one
>carb then two... Two just means it takes at least twice as long to do
>any work with the carbs... and twice as many parts to fail. I am curious
>especially with Dash Week's recent thread about overboring his carb to
>get more oxygen into his engine at higher altitudes.
>
>
>Zack
>
>P.S. the MuZ Skorpion looks like a fun little bike, anyone ridden one?
>
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[dsn_klr650] nklr-dual carb questions...
Posted: Tue Jun 27, 2000 2:21 pm
by Dash Weeks
At 09:17 AM 6/27/2000 -0400, Zachariah Mully wrote:
>All-
> I was just reading an article on some motorcycle site (it was y2f.com
>or something, I can't find it again, anyone know this site) about the
>2000 MuZ Skorpion and Black Panther. They both use a Yamaha 660cc 5v
>single with 2 carbs! Now this piqued my interest... Why would you put
>two carbs on a single cylinder engine?
> The only way I could reason this was that there are inefficiencies in
>the mixing and control in large carbs, and having two allowed better
>more precise control. But then I was talking to my brother who is
>rebuilding his 1967 GTO and he was telling me about the huge Holly(?)
>carbs that he got for it, and how I wouldn't believe how large they
>were.... WTF? Obviously high-performance cars of yesteryear didn't seem
>to support my hypothesis, so what gives?
> Not that I am not happy with the KLR engine... I would rather
> have one
>carb then two... Two just means it takes at least twice as long to do
>any work with the carbs... and twice as many parts to fail. I am curious
>especially with Dash Week's recent thread about overboring his carb to
>get more oxygen into his engine at higher altitudes.
>
>
>Zack
>
>P.S. the MuZ Skorpion looks like a fun little bike, anyone ridden one?
Zack,
I don't know about the dual Carby thing. But I just bought a spare (he he
he) carby from a fellow lister. I should have it next week sometime. I'm
gonna bore it out to 40-41mm and then fine tune the other stuff in there to
let more air in. I live at 7500 feet so rich is the norm here, for near
every "normally" aspirated vehicle. This may end up being a long project
since I'll be reluctant to tear my bike apart again during the good
weather. I've been without it long enough. I finished up most of my main
electricals last night. I had to tear apart my wheels again yesterday and
send all the spokes back to Buchanan's. Long story... I'll save it until
someone inquires.
laterZ
Dash
[dsn_klr650] nklr-dual carb questions...
Posted: Tue Jun 27, 2000 2:32 pm
by TLrydr@aol.com
Have not rode one yet, But from what i read the Muz puts out about 49 BHP.
And the KLR only makes around 38 or 36 BHP, The KTM Duke is about 51 BHP.
So the Muz should smoke the KLR??
Mike
In a message dated 6/27/00 11:21:18 AM EST, zmully@... writes:
<< Zack
P.S. the MuZ Skorpion looks like a fun little bike, anyone ridden one? >>
[dsn_klr650] nklr-dual carb questions...
Posted: Tue Jun 27, 2000 4:09 pm
by Andy Watts
On 2000-06-27 spye@... said:
>-----Original Message-----
>Date: Tuesday, June 27, 2000 1:26 PM
>2 carbs! Now this piqued my interest... Why would you put
>>two carbs on a single cylinder engine?
>Zach,
>Not sure why, but I've seen it before. My 86' Honda XL 600 had a
>factory dual carb set up. Something about better throttle response
>at low rpm?? Steve Pye
I used to own a Yamaha XT550 which had (i think!) a twin choke carb. I seem
to remember that the second choke did'nt open until the throttle hit the
half way mark.. then it nigh on took off
--
Andy - Southampton
[dsn_klr650] nklr-dual carb questions...
Posted: Tue Jun 27, 2000 4:53 pm
by Jeffrey L. Walker
> All-
> I was just reading an article on some motorcycle site (it was y2f.com
> or something, I can't find it again, anyone know this site) about the
> 2000 MuZ Skorpion and Black Panther. They both use a Yamaha 660cc 5v
> single with 2 carbs! Now this piqued my interest... Why would you put
> two carbs on a single cylinder engine?
> The only way I could reason this was that there are inefficiencies in
> the mixing and control in large carbs, and having two allowed better
> more precise control. But then I was talking to my brother who is
> rebuilding his 1967 GTO and he was telling me about the huge Holly(?)
> carbs that he got for it, and how I wouldn't believe how large they
> were.... WTF? Obviously high-performance cars of yesteryear didn't seem
> to support my hypothesis, so what gives?
> Not that I am not happy with the KLR engine... I would rather have one
> carb then two... Two just means it takes at least twice as long to do
> any work with the carbs... and twice as many parts to fail. I am curious
> especially with Dash Week's recent thread about overboring his carb to
> get more oxygen into his engine at higher altitudes.
>
>
I had a Honda XL600R that had dual carbs. The carbs had a linkage that let
them progressively open (with a balance slot between the input ports). It
was awesome, because I could cruise around at half throttle and conserve
gas, or open it wide and take off. Kind of like two barrel and four barrel
carbs on cars.
Here's my take on it, with two carbs, you do get better control and more
precise metering of the gas for the same amount of CFM that one single large
carb would provide. The reason is because the velocity of the air flow
through the dual carbs is faster than the velocity through the single carb.
You would also have less lag time when opening the throttle wide, since the
velocity is greater to start with.
Jeff
another action shot of my kid (51k) nklr
Posted: Tue Jun 27, 2000 11:56 pm
by Mark
Not bad for a seven year old; great form too! Took pix of him
jumping off car ramps this evening.
Mark
B2
A2