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dr350-digest        Thursday, November 11 1999        Volume 01 : Number 195




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Date: Wed, 10 Nov 1999 12:58:53 -0500
From: Christopher Bruno <[e-mail]>
Subject: (dr350) Carb issues....

Hello all...

I've been lurking on the list for a few weeks now and figured I'd introduce
myself with a few questions.

I'm a mechanical engineer in Massachusetts and quite a motorcycle enthusiast.
I learned to ride on a 1975 DT175 when I was 10 and have been mostly riding
streetbikes for the last 5 years only riding offroad every now and again,
with the same old DT.  Two weeks ago I bought Nick Sperduto's old 1990 DR
350S and have been having a blast on it the past couple of weekends.

Anyways, I cleaned out the carb last night because the bike doesn't
settle down to idle quickly and cleaning it didn't seem to help.  The
problem isn't the cables and there didn't seem to be any obvious signs
of wear on the slide or anything that would cause it to hang up.

Anyone have any ideas on why the vacuum would persist in such a way that
the bike takes so long ( a few seconds) to return to idle?

Also, I understand that the dirt carb (the TM33 pumper) is a much better
carb - particularly for off road use.  To those of you that have swapped
from street carb to dirt carb, did you need new throttle cables and/or
boots? Also, where's a good place to look for used parts?  Thanks!!!

- -Christopher Bruno
95 VFR
88 EX500 Racer
75 DT175
90 DR350S
http://www.geocities.com/brunoblazer

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Date: Wed, 10 Nov 1999 10:37:00 -0800
From: jessekientz <[e-mail]>
Subject: Re: (dr350) Carb issues....

Hi Chris,  First I would suggest checking for vacuum leaks, 1. At the hose coming from the
petcock to the vacuum port on the carb 2. The rubber manifold at the head interface and the
carb connection. 3. The diaphragm inside the top of the carb. These are the most likely
spots. Did you make sure the pilot jet was clean and open,  this is a very small opening about
.013" and this controls the idle circuit along with the fuel screw located under the front of
the carb originally plugged except for a very small hole over it. This is where you adjust the
idle mixture. But needs to be "carefully" drilled out to access the fuel screw. Since the 90
dr/s has a single cable it should work on the pull side of the tm33ss carb that are available
from Thumper Racing. you will also need a dirt model rubber manifold and spacer with a vacuum
port for the fuel petcock operation.  I could supply you with a special sleeve for the back of
the carb to interface with your airbox boot or you could just get a Vortex Airbox that
connects right to the dirt carb or the stock cv carb. Which would wake up your dr
significantly.  Boy I do ramble don't  I  any more questions feel free to contact me.

Regards Jesse
http://kientech.com

Christopher Bruno wrote:

> Hello all...
>
> I've been lurking on the list for a few weeks now and figured I'd introduce
> myself with a few questions.
>
> I'm a mechanical engineer in Massachusetts and quite a motorcycle enthusiast.
> I learned to ride on a 1975 DT175 when I was 10 and have been mostly riding
> streetbikes for the last 5 years only riding offroad every now and again,
> with the same old DT.  Two weeks ago I bought Nick Sperduto's old 1990 DR
> 350S and have been having a blast on it the past couple of weekends.
>
> Anyways, I cleaned out the carb last night because the bike doesn't
> settle down to idle quickly and cleaning it didn't seem to help.  The
> problem isn't the cables and there didn't seem to be any obvious signs
> of wear on the slide or anything that would cause it to hang up.
>
> Anyone have any ideas on why the vacuum would persist in such a way that
> the bike takes so long ( a few seconds) to return to idle?
>
> Also, I understand that the dirt carb (the TM33 pumper) is a much better
> carb - particularly for off road use.  To those of you that have swapped
> from street carb to dirt carb, did you need new throttle cables and/or
> boots? Also, where's a good place to look for used parts?  Thanks!!!
>
> -Christopher Bruno
> 95 VFR
> 88 EX500 Racer
> 75 DT175
> 90 DR350S
> http://www.geocities.com/brunoblazer
>
> Support Dual Sport News with your subscription http://www.geocities.com/~klrdsn/page2.html
> Visit the dr350 archives at http://www.listquest.com/lq/search.html?ln=dr350
> Unsubscribe by sending a message to [e-mail]
> Leave subject blank, message is unsubscribe dr350 (or dr350-digest).


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------------------------------

Date: Thu, 11 Nov 1999 08:52:18 PST
From: "Bryan Nolastname" <[e-mail]>
Subject: (dr350) Trip report: Wolf Pen Gap ORV Area near Mena, AR.

Monday morning I pulled out of Dallas w/ my DR in trailer heading to Mena,
AR to ride an off-road vehicle area I learned about on the net.  I'd been to
the area around Mena about 10 times or so on sportbikes...excellent mountain
curves all over the place...but I'd never been off-road there.

Wolf Pen Gap was the BEST trail riding I've EVER done!  OK...only riding
off-road since 2/99, but still, this place would appeal to anyone.  42 miles
of interconnected "off-road vehicle only" trails, each marked as EASY, MORE
DIFFICULT, and MOST DIFFICULT.  They've used a bulldozer or something to
push up these excellent 2-4 foot high jumps in the middle of the trails
about every 40 yards or so, regarless of whether the trail was flat, curved,
or steep up/down hill!  I was probably airborne for a good 10 minutes in the
5 hours I rode out there!  Trails crossed creeks, flats, & alot of
mountains.  The most difficult trails were a challenge!  I know I rode some
45 degree angles up & down the mountains (or big hills, depending on where
you're from).  Best time I've ever had off-road.  Fall foliage was at its
peak.  Only saw a US Forest guy out there in a pickup cruising around....no
other riders at all.  The DR performed flawlessly...my suspension & carb
mods have made this bike tons of fun.

I was going to ride the ORV area around Daisy State Park (Lake Greeson), but
my pregnant wife had subltley guilted me in to coming back the same day.  It
has 28 miles of trails that follow the lake w/ lots of hills.  I'll do it
next time and report back.

I highly recommend Wolf Pen Gap for anyone w/i a day's drive to Mena.  There
are a couple of clean, cheap, bike-friendly $26 motels in town (Holiday
Motel, 501-394-2611, on Hwy 71).  And I noticed you can camp along the
trails at WPG for free.
Happy Trails-
Bryan in Dallas
95 DR350SE

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Date: Thu, 11 Nov 1999 12:29:37 -0500 (EST)
From: [e-mail] (John)
Subject: [none]

unsubscribe

   bought new computer, have new address)


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Date: Thu, 11 Nov 1999 19:04:45 EST
From: [e-mail]
Subject: (dr350) Bryans ride

Awesome ride report Bryan.. especially the jumps 2-4 feet high along the
trail!!
Will I ever be happy with MY 91 DR??  Maybe when I swap out the front forks!

Guy

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End of dr350-digest V1 #195
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