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dr350-digest           Friday, July 30 1999           Volume 01 : Number 118




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

Date: Fri, 30 Jul 1999 08:33:48 -0700
From: <[e-mail]>
Subject: Re: (dr350) News from Portugal / Acerbis tank / Big Bore Kits / FS carb vs Pumper carb

Mark,

I have a 441; 1,800 trail miles (a few at passing two smokes) and no problems -
runs the same as day one: it's a kick to roost, and the front will stand up
easier; expect to go through tires quicker as you will wack the throttle more
often just for kicks.

The info. I have says the 435 is 10 to 1. WB is a half hour away from me, and a
local shop has done many of the 441s (they reasoned: why not go all the way if
you go through the trouble to take it apart?), which is why I went that way.
Other than 1mm larger bore the parts are similar; WB uses an Arias piston and
Thumper a Weisco (last I heard); either one's a winner.

The only problem with going to such a boost, though, at least with my
experience, is the suspension flaws are now accentuated - it took me a while to
figure this out: the suspension acted awkward because of the boost in power.
Why? The stock setup was never intended to handle such boost, so be prepared to
put at least an = amount of $ into the suspension, otherwise you will
bepartially disappointed with the side effects of a big bore boost.

Cams? Some have had good results (T. Warr); I was told by Drew Smith, CG and
Thumper that the stock
grind is fine uless you want to make a racer.

John




"Mark Sims" <[e-mail]> on 07/30/99 06:08:10 AM

Please respond to "Mark Sims" <[e-mail]>

To:   Suzuki DR350S <[e-mail]>
cc:    (bcc: John D Gill/USA/Conexant)
Subject:  Re: (dr350) News from Portugal / Acerbis tank / Big Bore Kits / FS
      carb vs Pumper carb




Hi,

I was thinking that I would go with a 377 or 385 bore for
3 years and then go bigger and sleeve - but stories like
this scare me.  I suppose I should jump straight to the
sleeve.

White Bros has a 441 with a 10.5:1 piston, whereas the
Thumper 435 uses a 9.5:1 (same as stock).

Does anyone know of good or bad stories with the WB 441?
Are they known to be as reliable as Thumper's 435?  Does
the higher compression piston add much power?  Should I
expect it to shorten the engine life much?

If you have a 441 and reply to this - please let me know
if you also have the White Bros all-around CAM.

Thanks...Mark
Atlanta, GA
'98 DR350SE


jessekientz wrote:
>
> Claudio, I don't know why the price is different but the 435 is
> better due to the fact that the sleeve is new and as thick as new.
> Where the 377 is a bored out stock cylinder making the stock cyl
> very thin. I have a White Bros 385 cyl on my bench with two broken
> out spots on the bottom of the cyl due to the thinness of the sleeve.
> I have done many 435 jobs and they are all still running including my
> own and shipping one out to germany tomarrow. Thumper only handles
> reliable stuff that means no problems for me or my customers.
> regards  Jesse
>
> ThunderSUB wrote:
>
> > Hi guys,
> >
> > Thank you all for the advice given on the Acerbis tank (Kurt, I
> > understood what you meant). Anyone here still has the Acerbis
> > installing directions and would consider scanning them and e-mailing
> > them to me, I would really appreciate it. I got it really cheap
> > ($63.00) so I thought it was a good deal... but the previous owner
> > didn't give me the mounting hardware and he lives 200 miles away... I
> > am gonna call him up tomorrow to see it he still has the stuff, so
> > that he could ship them to me.
> >
> > --- // ---
> >
> > The Thumper Racing 435 Kit is a lot cheaper than the WB 377cc Kit, why
> > ?
> >
> > I don't want to go all the way to 435cc, I am afraid of reliability
> > problems within the cylinder.
> >
> > Jesse, e-mail me when the Thumper Racing '99 catalog is out. I might
> > consider ordering one for me.
> >
> > --- // ---
> >
> > What's the difference between a pumper carb and a FS carb ? I know
> > what a FS carb is and how it works, don't know much about the pumper
> > one's... Is a pumper carb a FS carb with a pumper to increase fuel
> > delivery to the engine to avoid bogging ?
> >
> > --- // ---
> >
> > I forgot to mention in my previous messages that my gearing is 13/43
> > and it's great off-road. I ride mainly in soft terrain (sand) and
> > sometimes also on trails (between lots of pine tree's, I guess the
> > right word must be "woods"...) connected by fire roads.
> >
> > I agree with Doug Bragg, I don't want to spend a lot of money on a '93
> > bike because I will probably buy a new bike (a 400cc - 4 stroke) March
> > 2000. I will just add a low cost slip-on and do some jetting, don't
> > want to spend more than $300.00 on  the bike. I recently tried a XR400
> > with an Ohlins shock on the back and it was really a better
> > handling/power package than the DR.
> >
> > I like the DR's engine and I love the bike but in the frame/suspension
> > (shock) department it's a bit weak, even for a beginner (on dirt
> > bikes) like me.
> >
> > ThunderSUB   (Claudio)
> > Lisbon, Portugal
> > http://drive.to/thundersub
> > http://www.ip.pt/~ip203789/r1/index.html
> > http://www.ip.pt/~ip203789/speed/speed.html
> > http://www.ip.pt/~ip203789/virago/virago.html
> >
> > [e-mail]
> > ICQ# [3072424]
> >
> > * 1982 Honda Dax 70
> > * 1993 Suzuki DR350S
> > * 1999 Yamaha YZF-R1
> >

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

Date: Fri, 30 Jul 1999 08:42:51 -0700
From: <[e-mail]>
Subject: (dr350) Big and Even Bigger Bore Kits

I have a 441; 1,800 trail miles (a few at passing two smokes) and no problems -
runs the same as day one: it's a kick to roost, and the front will stand up
easier. Though expect to go through tires quicker as you *will* wack the
throttle just for kicks.

WB is a half hour away, and a local shop has done many of the 441s (they
reasoned: why not go all the way if you go through the trouble to take it
apart?); they also do 385 but prefer the 441. Ask for Mark @ Southland
(714-893-5091).

The only problem with going to such a boost is now the suspension flaws become
accentuated - it took a while to sort this out: the suspension acted awkward,
overwhelmed because of the boost in power. Why? The stock setup was never
intended to handle the higher boost, so be prepared to put an = amount of $ into
the suspension, otherwise you will now be sidetracked by the odd suspension
habits.

Cams? Some have had good results (T. Warr); I was told by Drew Smith, CG and
Thumper that the stock
grind is fine unless you want to make a racer.

John



"Mark Sims" <[e-mail]> on 07/30/99 06:08:10 AM

Please respond to "Mark Sims" <[e-mail]>

To:   Suzuki DR350S <[e-mail]>
cc:    (bcc: John D Gill/USA/Conexant)
Subject:  Re: (dr350) News from Portugal / Acerbis tank / Big Bore Kits / FS
      carb vs Pumper carb




Hi,

I was thinking that I would go with a 377 or 385 bore for
3 years and then go bigger and sleeve - but stories like
this scare me.  I suppose I should jump straight to the
sleeve.

White Bros has a 441 with a 10.5:1 piston, whereas the
Thumper 435 uses a 9.5:1 (same as stock).

Does anyone know of good or bad stories with the WB 441?
Are they known to be as reliable as Thumper's 435?  Does
the higher compression piston add much power?  Should I
expect it to shorten the engine life much?

If you have a 441 and reply to this - please let me know
if you also have the White Bros all-around CAM.

Thanks...Mark
Atlanta, GA
'98 DR350SE


jessekientz wrote:
>
> Claudio, I don't know why the price is different but the 435 is
> better due to the fact that the sleeve is new and as thick as new.
> Where the 377 is a bored out stock cylinder making the stock cyl
> very thin. I have a White Bros 385 cyl on my bench with two broken
> out spots on the bottom of the cyl due to the thinness of the sleeve.
> I have done many 435 jobs and they are all still running including my
> own and shipping one out to germany tomarrow. Thumper only handles
> reliable stuff that means no problems for me or my customers.
> regards  Jesse
>
> ThunderSUB wrote:
>
> > Hi guys,
> >
> > Thank you all for the advice given on the Acerbis tank (Kurt, I
> > understood what you meant). Anyone here still has the Acerbis
> > installing directions and would consider scanning them and e-mailing
> > them to me, I would really appreciate it. I got it really cheap
> > ($63.00) so I thought it was a good deal... but the previous owner
> > didn't give me the mounting hardware and he lives 200 miles away... I
> > am gonna call him up tomorrow to see it he still has the stuff, so
> > that he could ship them to me.
> >
> > --- // ---
> >
> > The Thumper Racing 435 Kit is a lot cheaper than the WB 377cc Kit, why
> > ?
> >
> > I don't want to go all the way to 435cc, I am afraid of reliability
> > problems within the cylinder.
> >
> > Jesse, e-mail me when the Thumper Racing '99 catalog is out. I might
> > consider ordering one for me.
> >
> > --- // ---
> >
> > What's the difference between a pumper carb and a FS carb ? I know
> > what a FS carb is and how it works, don't know much about the pumper
> > one's... Is a pumper carb a FS carb with a pumper to increase fuel
> > delivery to the engine to avoid bogging ?
> >
> > --- // ---
> >
> > I forgot to mention in my previous messages that my gearing is 13/43
> > and it's great off-road. I ride mainly in soft terrain (sand) and
> > sometimes also on trails (between lots of pine tree's, I guess the
> > right word must be "woods"...) connected by fire roads.
> >
> > I agree with Doug Bragg, I don't want to spend a lot of money on a '93
> > bike because I will probably buy a new bike (a 400cc - 4 stroke) March
> > 2000. I will just add a low cost slip-on and do some jetting, don't
> > want to spend more than $300.00 on  the bike. I recently tried a XR400
> > with an Ohlins shock on the back and it was really a better
> > handling/power package than the DR.
> >
> > I like the DR's engine and I love the bike but in the frame/suspension
> > (shock) department it's a bit weak, even for a beginner (on dirt
> > bikes) like me.
> >
> > ThunderSUB   (Claudio)
> > Lisbon, Portugal
> > http://drive.to/thundersub
> > http://www.ip.pt/~ip203789/r1/index.html
> > http://www.ip.pt/~ip203789/speed/speed.html
> > http://www.ip.pt/~ip203789/virago/virago.html
> >
> > [e-mail]
> > ICQ# [3072424]
> >
> > * 1982 Honda Dax 70
> > * 1993 Suzuki DR350S
> > * 1999 Yamaha YZF-R1
> >

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

Date: Fri, 30 Jul 1999 09:02:50 -0700
From: Bryan Cowger <[e-mail]>
Subject: Re: (dr350) News from Portugal / Acerbis tank / Big Bore Kits / FS carb  vs Pumper carb

> If you have a 441 and reply to this - please let me know
> if you also have the White Bros all-around CAM.

I have the 441 mod, done by the previous owner.  Actually, he had WB do all
the cylinder mods, and then his dealer did the final engine reassembly.

The cam is the Suzuki "Hi-Po" cam, with matched-hardness lifters.

He put about 250 miles on it before being forced to sell for other reasons.
I've put probably another 450 miles so far.  No problems at this point.  (It
was running very hot when I first got it -- proper jetting took care of
that.)

Fires up on the 1st or 2nd kick; smooth power across the band.  Not a
particular 'hit' anywhere -- just lots of power everywhere.  I'd certainly
recommend this particular mod for anyone looking for some serious grunt for
their DR.

I also agree with John when he refers to suspension -- plan on really
bumping the quality of that up, perhaps even before an engine mod.  Or,
better yet, just buy his DRX441!  (No, I'm not on commission...;)

Bryan
Sacramento, CA

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

Date: Fri, 30 Jul 1999 12:05:36 EDT
From: [e-mail]
Subject: Re: (dr350) Thinking

Dave,

I have a '93 DR350S with Race Tech'ed forks, stock shock and a 13t front
sprocket instead of a 14t.  My son has a Honda XR80.  Since both these bikes
are trail bikes we take what we get when we do motocross tracks.  The weight
is where I feel the problem is (along with a lack of skill on my part). As I
attack more jumps the thump upon landing concerns me. I really feel as if the
bike could break.  But it hasn't yet! We were recently in Colorado and I had
an opportunity to ride a WR400 on a motocross track and was very impressed
with the suspension, but was surprised at how much it made me appreciate my
DR. The motor was awesome; it would just keep pulling, but then instead of
going too fast I was going much too fast.  Maybe fear was stopping me from
fully appreciating what the 400 is capable of doing.  I know that it is a
better motocross bike than my DR, and may be a better off-road race bike, but
I don't know if it is a better trail bike.  If you are only going to moto
with you bikes, maybe a 125 or 250 two stroke is the way to go!

John

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

Date: Fri, 30 Jul 1999 10:58:39 -0600
From: njkouba <[e-mail]>
Subject: Re: (dr350) News from Portugal / Acerbis tank / Big Bore Kits / FS carb  vs Pumper carb

Mark Sims wrote:

> Hi Jesse,
>
> Megacycle says they don't support a cam for the DR350SE.
> They said a cam for the SE model controls the decompression.
> They also only show a cam for DR350 through 1996 and said
> they haven't addressed whether the cam will fit later models
> (mine is a 98).
>
> White Bros makes 2 cams - an all around and a competition.
> Only the all around version is supported for the SE in a
> model that has the decompression mechanism.  The competition
> cam requires R/D springs and shorter valve guides or lifters
> or something.
>
> I was planning on getting the all around cam.  I don't think
> its much of a change from stock (though I'm not sure what the
> stock specs are).
>
> Any idea which cam you heard had problems and what the
> problems are?
>
> Can I use a non-SE cam and control the decompression some
> other way?
>
> Do you know if megacycle's cam for a '96 would fit my '98?
>
> Regards...Mark


Mark:  I do not know about the aftermarket cams but heres the scoop on the stock ones.  The
1994 up DR350 and DR350SE cams will interchange.  The lift and duration appear to be the same
but the centrifical compression release cam is in a different location in  referance to when
it opens the exhaust valve before it's running.  The DR350SE model cam will fit in the dirt
only model but will be a lot harder to kick and start without using the manual compression
release.  Also the 1997 up DR350SE models went to a smaller starter and a gell battery,
making it a pretty marginal set up for the big bore kits, especially below 50 degrees F.  A
good fix would be to use the dirt only cam as they kick over considerably easier.  The DR350
dirt only cam has a "5" stamped on the sprocket end, and the DR350SE has a "6".    Norm

Suzuki DR Suspensions
DR. DR
http://www.geocities.com/motorcity/2299


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

End of dr350-digest V1 #118
***************************