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1999-05-21
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From: owner-dr350-digest@lists.xmission.com (dr350-digest)
To: dr350-digest@lists.xmission.com
Subject: dr350-digest V1 #54
Reply-To: dr350-digest
Sender: owner-dr350-digest@lists.xmission.com
Errors-To: owner-dr350-digest@lists.xmission.com
Precedence: bulk
dr350-digest Friday, May 21 1999 Volume 01 : Number 054
----------------------------------------------------------------------
Date: Fri, 21 May 1999 00:29:44 -0400 (EDT)
From: jadler@webtv.net (James Adler)
Subject: (dr350) tires & jetting
George, Jetting is trial & error due to multiple factors, outfits like
Thumper will only get you in the ballpark (hopefully).
Plan on buying several main jets like a 135 & 140. The carb parts you
added do just what you described, help off-idle response, ie clutchless
throttle wheelies. The top end increase will not be that dramatic, you
are just too lean right now on top end with the cutoff airbox.
Chen Shin 755 tires are full knobbys, that are for offroad use only, not
DOT approved. I use them, they work well for trail use, the 5.30 size is
a monster but will fit but the 4.60 is what most people would suggest.
For aggressive DOT tires look at the Kenda Trackmaster, they have the
Dunlop 752 pattern. Others like Pirelli tires but they are more
expensive.
------------------------------
Date: Fri, 21 May 1999 00:52:49 -0400 (EDT)
From: jadler@webtv.net (James Adler)
Subject: [none]
George ( & others),
If you really want to have fun with your new found throttle response ( &
still have streetabiity) on your SE model go to the original DRS gearing
of 14 front & 43 rear. IMHO this is great compromise gearing, I don't
know why Suzuki made it higher.
------------------------------
Date: Fri, 21 May 1999 07:35:19 -0400
From: Charlie Vincent <Charlie@mail.j-e-morgan.com>
Subject: (dr350) tires & jetting -Reply
Ok, I've been watching these mods threads for awhile, but this post has
really gotten my attention. Some good power increase for the cost of a
few jets and so tunning time. I'll bite. I have a 90 DRSE 350 completely
stock. After I cut off the top of the air box, what aftermarket filter should
I buy and where can I get it? Next, what jets and other hardware should
I buy and how can I go about tunning these babies. I'm mechanically
inclined, but have no experience with jetting at all.
Charlie
>>> James Adler <jadler@webtv.net> 05/21/99 12:29am >>>
George, Jetting is trial & error due to multiple factors, outfits like
Thumper will only get you in the ballpark (hopefully).
Plan on buying several main jets like a 135 & 140. The carb parts you
added do just what you described, help off-idle response, ie clutchless
throttle wheelies. The top end increase will not be that dramatic, you
are just too lean right now on top end with the cutoff airbox.
Chen Shin 755 tires are full knobbys, that are for offroad use only, not
DOT approved. I use them, they work well for trail use, the 5.30 size is
a monster but will fit but the 4.60 is what most people would suggest.
For aggressive DOT tires look at the Kenda Trackmaster, they have the
Dunlop 752 pattern. Others like Pirelli tires but they are more
expensive.
------------------------------
Date: Fri, 21 May 1999 08:15:52 -0400
From: "Keith Browning" <husky350@sprynet.com>
Subject: (dr350) Carb Questions
Hello everyone.
Two days ago I got the Thumper JX needle and spring and installed. Easy
enough, and they look different enough from the stock parts, but I couldn't
tell any difference in performance. Then I remember seeing that the needle
and spring are necessary to make it run right after you open up the airbox.
So yesterday I cut off the top of the lid to Thumper specs (make the hole
4 inches wide, 3 inches long, with the front opening of the hole about 1
inch behind the airbox mounting tabs) and put in a White Power filter. A
quick ride around the neighborhood, and again I couldn't really see a
difference. Maybe I just didn't ride it enough or under the right
conditions, but the only the I noticed different was the sound of air now
rushing into the airbox.
Finally, I put on a 13 tooth front sprocket - cha-ching! Second gear
wheelies are now possible without even touching the clutch. I was also
pleasantly surprised to find that this gearing works better for round town
riding (I haven't had it off-road since the change). I found that most of
the time the bike was in the 5-6k rpm range, right in the meat of the
power, whereas before it was quite a bit lower and had to be revved a
little to get into the power band. Now it tends to stay in that range.
Pleasant surprise #2 - I have one extra gear to play with! Sure it had six
gears before, but 6th was pretty much useless. Now I can actually
accelerate in 6th and rev it fairly high - I got it up to a little over
75mph, which is about as fast as it wanted to go before the gearing change.
I'll still but the 15 tooth back on if I plan to ride on the highway a
lot, but for around town and short highway jaunts, this lower gearing makes
a lot more sense.
But all is not well with the changes. My previously asthmatic motorcycle
is now hyperventilating - the jetting is seriously lean now. The biggest
problem area is just off idle to maybe 1/4 throttle. If you try and hold a
steady throttle at that range then it surges quite a bit. It did so
before, but almost imperceptibly. Opening the throttle a little more the
surging goes away, but it still backfires, a little more even, when I let
off the throttle and coast. Finally, when holding the throttle wide open
and accelerating, it seems that the power seriously drops off beginning
around 8000 rpm. It may be that this characteristic of the power band, and
I didn't notice before because it would always be so much lower in the rev
range. Is that the case or could it be related to the jetting?
So now I have a basically stock 96 DR350SES with an opened up airbox and
thumper JX needle and spring. What should I try to fix the jetting woes?
The jetting is stock - should I go larger on both the pilot and the main?
Also, what about the position of the clip on the Thumper needle - I left it
where it was when it was shipped, which is in the same position as the
stock; second up from the bottom I think.
Any help is greatly appreciated!
Thanks,
Keith Browning
Pittsburgh, PA (but hopefully moving soon!)
------------------------------
Date: Sat, 22 May 1999 01:32:00 EDT
From: SMRGEO@aol.com
Subject: (dr350) D/S KIT FOR SALE
FOR SALE-
Baja Designs Dual Sport Kit for DR350. Still in original box w/ instructions.
Decided to keep my bike in the dirt! Paid $400+.....Sell for $300. Thanks.
George in NW Indiana
------------------------------
End of dr350-digest V1 #54
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