Cycle News is a weekly magazine that covers all aspects of motorcycling including Supercross, Motocross and MotoGP as well as new motorcycles
Issue link: https://magazine.cyclenews.com/i/125682
smaller blkes, so we don't know what a 250 would sound 11ke with the Sting-Out lnstalled. The modification consists 01 drUling many 3/16" holes in the existing chamber sUnger. Steel-wool pads are wrapped around the stinger, and a piece of sultable-diameter (we used 1-3/4" i.d,) exhaust-pipe tubing is pushed over the steel- wool. The forward end of the large The aft end of the casi ng is cut wi th . tin snips and bent to fit the diameter of the sti nger. is that it lets you hear how the bearings sound in the engine and gear-box, so that. repairs can be started before things start to tear uP inside. H. J. SHEAR, JR. El Cajon, Cal1f. chambers on our family blkes so that, for instance, a Bultaco Sherpa S 125 sounds llke a muffled Lobito or a Matador. In addition to eliminating the ears which ring unUl Wednesday noon, the mod1f1cation. costs almost nothing, and weighs less than a pound. Further, there is no detectable power Readers are inVited to submit their "Hot Tip". If judged by Cycle News to be of interest to other motorcycle riders, it will be published, and the author will be paid regular contributor fees. Articles should be sent to, "Hot Tip," Cycle News, Box 498, Long Beach, Cal1fornia 90806. 1 have suffered through ringing ears from expansion chambers for about a year now, and have come up with something which might be of interest to many riders. We have been able to muffle eXPansion "Many" 3/16 inch holes are drilled through the stinger of the chamber. The Sherpa S 100cc expansion chamber before modification. loss on the blke, and it even seems to improve the low end a little. We have installed the "Sting-Out" on the Sherpa S 125, the Sherpa S 100, the American Eagle 125, and the HodakaSuPer-Rat. We haven't tried it on a 250, because we don't own one, but the sound of a 250 chamber isn't as sharp as that on the Go straightto Pacer Torque Head - Developed for Gary & Dwane Jones for Moto-X competition. Fits all Enduro models. DT-1 $39.95. AT-1: CT-1 $38.95. Manifold Adaptor - Bolt on DT-1 30mm carb for CT-1 & AT-1 enduros for instant power increase - $12.50. Tacb & Speedometer Plugs That fi nal touch that keeps sand & mud out of engine & hub. That custom look - $3.35 Steel wool pads are wrapped around the "holy" stinger, and it is encased in suitably sized exhaust pipe. tUbing is welded to the rear cone of the chamber, and the aft end is cut with Unsnips so that it can be bent down to the diameter of the stinger. We didn't even bother to weld it. The enclOSed photos show the installation on the Sherpa S 100cc. The addition of the Sting-Out on all four bikes has required no re- jetting of the carburetor or any other adjustment to the tuning. In this day and age of nonriders getting uP-tight at blke noise, it would seem that such a deVice would find wide useage, but most people I have shown it to don't seem too interested. We don't have anything to sell, or any axe to grind - 1 just would 11ke fellowriders to hear about this so they could give it a try. As 1 said before, I got to thinking about his mainly to eliminate my ringing ears, because anything which causes them to ring for 3 days can't be doing them much good. 1 read a recent article in one of the magazlnes where some fellows muffled a Harley Baja 100, but their modifications required cutting on the critical chamber dimensions, which this deVice doesn't. One further advantage of the sUng-Out The finished product: a just-aspowerful, yet considerably silenced 100cc Sherpa S. YAMAHA TO ENTER WORLD MX COMPETITION It has been learned that more oriental opposition is due soon in the realm of world motocross championship competition. Yamaha is expected to enter a factory team sometime in the future, probably next year • At the recent Motocross Championship race held at San Severino, Italy a squad of Yamaha engineers and· riders were busy checking out and photogr~phlng everything in sight. Simi Valley M.C. presents OXNARD SPORTS FESTIVALsponsored ., Oxnard At"'etic Association,'nc. 1st ANNUAL DIST. 37 POINT MOTOCROSS SUNDAY JUL Y- 26th J25-250-500-0PfN-POWDfR PUff Mini bike race fer kids IIIder 12 ($1.50 entry lor minis) European style motos classes split 0_ 30 entries Get the best accessories for your bike. Other Pacer products include: triple clamps, straight cut gears, cross country tanks, tank seat combinations, air filte & fender combinations, front fork springs, Enduro stingers, fork helper springs, GYT kit ported sleeves, wrist pin pullers and rim jacks. Dealer inquiries invited. ~PACER Pit racers will 'e to'd to 'eave LOADS Of TROPHIES Post entry: $5.00 all cards 01 A.M.A. districts honored Spectators: $1.50 Uncler 12: Fr.. Practice: 9:80 A.M. Directions: Limed from H1chwaJ 101 & HIChway 1 at the Wacon Wh..1 Junction.