Wilsons Sandbox

I got a old Cobra hanging on the garage wall, that was donated as a experiment (had self destructed) its lighter than the OEM, but sure is louder, the alum. can basically blew out where it clamps to the pipe running to the header, so I shortened the internal steel cone and welded the two parts together (making it a 1 piece with a slightly moving can) this shortened the overall length, but I made a short 1" bar stock piece that hooks to both muffler hanger bolt hole and connected the Cobra to that. During my LOUD MUFFLER testing, I repacked it 4 times, starting with stainless steel packing, then some fiberglass sandwiched between the SS, then more fiberglass/less SS, then working down to only fiberglass in efforts to quiet it down, noticed that fiberglass only was a little quieter, more tone, but still loud for me. With that pipe the dreaded lean surges came back, since I had drilled the pilot screw out and set for the OEM already. It did seem to have more torque on the trails, sandpits and general offroad, did'nt notice much difference on the road, except it was TOO LOUD. My opinion, not that much difference in weight. Mileage ? seemed to drop alot, but was mostly offroading with it, and did'nt check it. Put stock back on and plan to leave it there. Since I have no desire to rejet the carb. Again.. just my $.02 Dooden

--- In DSN_klr650@y..., "Russell Dyck" wrote: > Is there a lighter and smaller muffler to replace the stock one with > that doesn't involve rejetting the carb and isn't to loud? > Or would putting a lighter muffler on the right side of the bike > create an imbalance and cause the bike to fall on it's left side all > the time?:-) > T.I.A. > Russ

Depends on your interpretation of "too loud". The supertrapp IDS2 is quite a bit lighter, 6 discs works OK with stock jetting (you would need to open the idle mix screw a little bit), but it's still pretty loud. I tried it and went back to the stock exhaust. I tried 4 discs, it cut off the top end power. Not much quieter anyway. Devon Russell Dyck wrote:

> > Is there a lighter and smaller muffler to replace the stock one with > that doesn't involve rejetting the carb and isn't to loud? > Or would putting a lighter muffler on the right side of the bike > create an imbalance and cause the bike to fall on it's left side all > the time?:-) > T.I.A. > Russ >

> Put stock back on and plan to leave it there. Since I have no desire > to rejet the carb. > > Again.. just my $.02 > > Dooden > >

Amazing just how many listers - over the years - have come to exactly that conclusion. But not before throwing money in the direction of Super Crap/Supper Tripe,. Big Guano and others. Lives were saved with the extra noise but little else was accomplished. Oh yeah, other wise dead time was filled fiddling with jets and yes many managed to lower their mpg to the mid/low thirties. Power gains ? nothing significant however never discount the placebo effect. Many reported "seat of pants" HP improvement until the new wore off. Bogdan, who does have his pilot screw pulled out to about 1, did go to Ace to buy two tiny washers that lifted the needle some and - last but not least - has a bit more flow and noise as a result of the Tweety cure. After all that mpg is about the same, low 50's to low 40's.

Not disagreeing with Bogdan about most of the the beer cans passing themselves off as an exhaust but I do have to remark that the Laser Pro Duro is a quality product, a bit louder than the stock but no where near the cacophony of noise found with the others. Durable, attractive, a more deeper tone than stock, negatives; probably heavier than stock, longer than stock. I did re-jet the carb several times using the dyno jet kit, the several came from trying first stage 1, then stage 2, then back to stock, then what I call stage .75, stock main jet, pilot at 2.25, air snorkel removed (no holes in airbox), and needle 1 postion higher (leaner) than suggested by K&N and a Twin Air filter. This results in mpg in the low 50's if I can keep the speed below 70mph on the freeway, and usually mid 40's in the dirt. No lean surge, no carbon on the swingarm from the cans vent hole (Stage 2 was coating the bike and mileage in the 30's). Hp maybe more, if it was at any carb setting it just wasn't a noticable difference as others have noted. Save your money on the jet kits, buy the adjustable needle, or shim it and get the same results. Bogdan did it for about $450 cheaper than I did but mine looks and sounds better ;^), worth the money? you decide, I'm happy with the bike. Brad

> > > Amazing just how many listers - over the years - have come to > exactly that conclusion. But not before throwing money in the

direction of

> Super Crap/Supper Tripe,. Big Guano and others. Lives were saved

with the

> extra noise but little else was accomplished. Oh yeah, other wise

dead

> time was filled fiddling with jets and yes many managed to lower

their mpg

> to the mid/low thirties. Power gains ? nothing significant however

never

> discount the placebo effect. Many reported "seat of pants" HP

improvement

> until the new wore off. > > Bogdan, who does have his pilot screw pulled out to about 1,

did

> go to Ace to buy two tiny washers that lifted the needle some and -

last

> but not least - has a bit more flow and noise as a result of the

Tweety

> cure. After all that mpg is about the same, low 50's to low 40's.

Thanks for your responces everyone I think I decided that I'm just going to keep the stock muffler on cause it sounds like it might not be worth it from my point of veiw. And the reason I didn't want a muffler that involed rejetting is every time I start playing with or try to fix a carb I break something. that and to me it just does not seem to worth the lose in gas milage, so ya I think I'll just stick to stock. Thanks a bunch everyone. Happy riding Russ

Just remember if'n she starts to whistle ("Tweety") like a VW, the fix is pretty easy, not so sure if it kills the spark arrester or not, but using a hammer and a long flat tip screwdriver, stick it in the exhaust hole, aim it down and rip the snot outta that seam in the preforated pipe till Tweety escapes, if another Tweety gets trapped in there, rip'r some more. Add's a little more tone it seems to me anyway. Have fun, spend your money on better things IMHO, Pro-Grip Gel grips are nice, bash plate if your rough on the trails, and whatever you see the need for, not what others feel the need. Dooden

--- In DSN_klr650@y..., "Russell Dyck" wrote: > Thanks for your responces everyone I think I decided that I'm just > going to keep the stock muffler on cause it sounds like it might not > be worth it from my point of veiw. > And the reason I didn't want a muffler that involed rejetting is > every time I start playing with or try to fix a carb I break > something. that and to me it just does not seem to worth the lose in > gas milage, so ya I think I'll just stick to stock. > Thanks a bunch everyone. > Happy riding > Russ

On Wed, 27 Aug 2003 kdxkawboy@... wrote:

> Looking through all the replies lets lock and load on the weekend of the > 13/14. > > Here are the final details for folks to plan on: > Date: 13/14

So, it looks like the wife and I may end up doing a "pre-check" on your course. We are on vacation the week before that (including that weekend) and already have a hotel reservation in Bridgeport (7th-9th) the and plans to check out Bodie etc. -- Doug Herr doug@...