SuzukiSavage.com /cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> Just got an S40, need to call fire department... /cgi-bin/YaBB.pl?num=1273553717 Message started by grimjaw on 05/10/10 at 21:55:17

Title: Just got an S40, need to call fire department... Post by grimjaw on 05/10/10 at 21:55:17 ... because I'm shooting flames from the exhaust on a regular basis. I traded a Suzuki 2005 GZ250 for a low-mileage 2008 S40 that already had a Harley Davidson pipe on it. I'm not sure of the type yet, but I'm researching. I LOVE the sound of it, but I'm pretty certain it's running too rich. I know about the frequent backfires on deceleration with the S40, but I'm also shooting blue and sometimes yellow flames from the exhaust when it backfires. There's sometimes a blue puff right after I shut off the engine, and if I jet down the interstate for awhile and then turn into an offramp I'll have a nice Batmobile jet on the way off. I've seen tons of carb-adjustment threads so I'm looking at those. I've tried removing the airbox and filter to see if I could change the mix a little without tearing into the carb yet. I occasionally get a little soot coming from the exhaust but not much. I'd love to keep this pipe, but I'm willing to lose it if I can't get it working without the dragonbreathing. I'll have pics of the whole thing up in the next 24-48 hours if that helps. Any information is appreciated. I'm really loving the Suzuki so far. :)

Title: Re: Just got an S40, need to call fire department. Post by verslagen1 on 05/10/10 at 22:03:12 And your complaint is what? ;D What's happening is cause it jetted so lean it's missing and the gas is flowing into the muff where a little heat and some fresh air ignite it. But check what jets you have 1st, if he swapped the muf, he shoulda did the jets.  most people don't want to get into it though.  Not hard, buy a jet set from lancer, get 4 allen socket head screws, drop the bowl, you may need to use a vice grip on the screws, I think they are locktited from the factory.  get yourself a mirror and a short flat bladed screwdriver and have at it.

Title: Re: Just got an S40, need to call fire department. Post by Serowbot on 05/10/10 at 22:18:20 ...and,... location, location, location... Jetting is entirely dependent on where you are and where you ride... Humidity, temperature, and elevation...

Title: Re: Just got an S40, need to call fire department. Post by grimjaw on 05/10/10 at 22:24:37 ...and,... location, location, location... Sorry, I'm in Arkansas and it's been mediumish humidity lately for us, 60-80F. jm

Title: Re: Just got an S40, need to call fire department. Post by Serowbot on 05/10/10 at 23:28:27 Okay,... lets say,.. Arkansas, nearly flat, nearly sea level, (less than 2000ft)... with a slightly open muffler,... (open the airflow to match, if it hasn't been done already)... k/n filter, or oiled foam. #152.5, or #155 main jet, #55 pilot... 2/3 to 1/2 thick needle jet spacer... Unless you are radically different than that (see 6's, ie, #160+main/#60+pilot)... look for a leaky petcock (very common),... or stuck float, or stuck needle slide (fairly common).... ...or,... just learn to love flames.... (shoot!,.. some people would pay for those!).... big singles, are poppy, and sputtery,.... maybe a little flamey?... Lets just say primitive,... Cool!... ;)...

Title: Re: Just got an S40, need to call fire department. Post by ALfromN.H. on 05/11/10 at 04:17:22 my 2005 did the same thing when I changed to a sportster muffler but re-jetting fixed it almost completely. I still get a little backfire on decelleration but I kinda like that. AL

Title: Re: Just got an S40, need to call fire department. Post by ralfyguy on 05/11/10 at 07:05:20 I live in Oklahoma with the same climate as the OP. Mine does the same thing with the flames. I tried a #55 idle jet instead of #52.5 OEM and a #150 main jet instead of #145 OEM and the bike ran like crap. Way too rich at idle, with black smoke sometimes and occasional cut outs at WOT with black smoke. That was with a new Iridium plug. I tried to make some adjustments, but didn't help. The bike seemed to have less power at WOT. It has the OEM air filter, which was fairly new. The OEM muffler has the baffle removed. So I chnged it back to the original jets and just live with the bangs. BTW, I have no exhaust leaks.

Title: Re: Just got an S40, need to call fire department. Post by grimjaw on 07/02/10 at 06:49:28 Finally managed to make a video of the flamethrower. http://www.youtube.com/watch?v=_8NKZZlF18E

Title: Re: Just got an S40, need to call fire department. Post by Serowbot on 07/02/10 at 08:18:25 Sounds like you are running too good for it to be the petcock.... Gotta' be rich on the jetting... since you bought it with the Harley muffler, chances are the jetting is not stock... Cool!... Flames!!.. ;D...

Title: Re: Just got an S40, need to call fire department. Post by justin_o_guy2 on 07/02/10 at 08:38:45 If Arkansas is nearly flat, that Ruskie spy chick aint got no tatas.

Title: Re: Just got an S40, need to call fire department. Post by Charon on 07/02/10 at 09:29:00 I'm not too impressed. Way back in 1960 I saw even more impressive flames jumping forth from the exhaust pipe on a Cushman Eagle. Another of my acquaintances removed all but the manifold from his 3-horse Cushman, brazed an old air horn bell onto a steel lawn chair leg (to get the ninety-degree bend) and stuck the resulting pipe into the Cushman's manifold. On deceleration it would throw basket-ball sized fireballs. It was loud enough you didn't really want to follow him very closely.

Title: Re: Just got an S40, need to call fire department. Post by Bubba on 07/02/10 at 09:30:21 I dunno, I'd say if at lower elevation ya need to go up on the jets one size but I'd do them one at a time. I replaced my needle spacer first (2/3 size of stock), got better, then pilot jet (barely, just went with the same size but bleed holes) still better, then one size up on the main. I'm good now. 2 turns out on the airmix screw. I'm a mile high so I didn't need to do much but I have a very similar sounding exhaust and a drop in K&N air filter. You being at a lower elevation I'd try bumping each circuit up incrementally until ya get what you need. First try to see if the air screw has any effect before diving into the carb jets. Turn it CCW to richen, CW to lean it out.

Title: Re: Just got an S40, need to call fire department. Post by ralfyguy on 07/02/10 at 10:42:20 Mine looks the same way at night.

Title: Re: Just got an S40, need to call fire department. Post by krsanky on 07/02/10 at 13:12:26 how can i make my bike shoot flames like that :)

Title: Re: Just got an S40, need to call fire department. Post by vtail on 07/02/10 at 16:30:44 First off, these carbs are Altitude Compensating. At a higher altitude there is a lower  baro pressure and consequently the needle and slide do not go up as high so the ratio of air/fuel (14 to 1) stays close to the same.  Caused by the pressure differential between the top and bottom of the carb diaphram. So I have been from sea-level to 5000 ft passes without any adjustments and it just runs great at any altitude. We run these carbs on small aircrafts from sea-level to 15000 ft with NO adjustments. Strombergs, SU's and our Mikuni's do not need to be fiddled with. Now a standard carb like the old Bings (and Holley's on your car) do need to be adjusted for altitude. See my setup is below and my exhaust does not have any blue-ing. It looks new.

Title: Re: Just got an S40, need to call fire department. Post by Bubba on 07/02/10 at 19:07:29 But you have changed it from your stock setup..me, I didn't change as much as you but I'm higher...isn't that correct or am I missing something?

Title: Re: Just got an S40, need to call fire department. Post by Routy on 07/02/10 at 19:41:44 Quote: I'd love to keep this pipe, but I'm willing to lose it if I can't get it working without the dragonbreathing. ------------------------------------------------------------------------ Grimjaw, I hate telling anyone to sell their s-40,......because it is the best, most unique, coolest  single cyl thumper in existence, but I'm going to put it to you straight,.....in cold hard facts,...... if you can't live w/ the "Breathing Dragon" (I like that name) throwing fire quite regularly, sell it. If you think that that pipe has anything to do w/ it backfiring, you are seriously mistaken. And if you think any hack job on the carb, or intake and exhaust system is going to make much ...if any difference, good luck.

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