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 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 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" 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 **************************