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Message started by theikeman on 07/18/05 at 00:54:41

Title: Backfiring like crazy
Post by theikeman on 07/18/05 at 00:54:41

Today I finally bought myself an 87 Savage, bright yellow and "LOUD". It has the stock airbox with a stock airfilter and a wide open Supertrapp muffler. The exhaust pipe is blue and gold and where the muffler connects to the pipe it too has some gold discoloring. The PO tells me the dealer cleaned and "adjusted" his carb, but had no idea if it got larger jets. He claims the dealer told him "all singles" discolor because they make so much horsepower ;D. It pops pretty good on deceleration, paticularly under load as in using the motor to brake on a downhill, sounds kinda like a jet breaking the sound barrier. I do have 7 of the spacers and one shiny endcap, but not the one with the supertrapp emblem, for the muffler. So, now to the questions; easiest way to get rid of backfiring? Can I use the supertrapp plates without the outer cap with the logo?

Title: Re: Backfiring like crazy
Post by lancer on 07/18/05 at 05:32:46

The base priced end cap is just a stamped piece of steel, no name or logo. As long as the plates will go on and you have an end cap that will bolt down then use it...you need it.
A stock Savage really needs a muffler with some back pressure on the exhaust system. That will help with the backfiring problem. The other part of the equation is to be sure that the pilot circuit is properly adjusted, The adjusting screw that the factory hides behind the little cap...remove the cap if it is still there, and adjust it. If you have to back the screw out 3 or more turns then you need the next larger size pilot jet. The only bike that should run a completely open muffler is a radically modified ...and I would suspect that even then, if hooked up to a dyno, a rad mod bike would make more/better power with a little muffling.
"All singles discolor because they make too much power"...REALLY?? This is the first time I have heard that the Savage makes TOO MUCH POWER. That must be the reason that when I am riding my Savage on the track at 135 mph that the suspension needs to be upgraded again.........yea right. That is the best one I have ever heard about the Savage.
Anyway, put the plates on the muffler, adjust the pilot circuit, and then go ride and enjoy.

Title: Re: Backfiring like crazy
Post by Greg_650 on 07/18/05 at 13:10:19

theikeman wrote:

This one is REALLY good. Let's see, anyone ever heard that the Savage will "make so much horsepower"? Gotta love those dealers....

Your SuperTrapp doesn't have the disks or the end cap installed? Without those, you'll never get it tuned right.

Title: Re: Backfiring like crazy
Post by Greg_650 on 07/18/05 at 13:19:37

Savage_Rob wrote:

LOL! Yeah, those 29 stock horses are just too much to contain!

Hey there, the dealer's right. The HP is up to 31, ya know.
:'(

Title: Re: Backfiring like crazy
Post by Savage_Rob on 07/18/05 at 13:25:51

theikeman wrote:

He claims the dealer told him "all singles" discolor because they make so much horsepower ;D.

I'm sorry but when I first read that I almost had Dr. Pepper shoot out of my nose.

Title: Re: Backfiring like crazy
Post by Greg_650 on 07/18/05 at 13:32:21

Savage_Rob wrote:

I'm sorry but when I first read that I almost had Dr. Pepper shoot out of my nose.

Yeah, WE, as in this forum, ride the biggest underpowered single of all time....go figure. And sometimes they too blow stuff out their nose.

Title: Re: Backfiring like crazy
Post by Savage_Rob on 07/18/05 at 13:37:23

Title: Re: Backfiring like crazy
Post by WD on 07/18/05 at 21:38:20

Okay, I'll fess up, I spit Pop Tarts and coffee on the key board I was laughing so hard.

A "Stuporcrap" without the right amount of discs and fuel tweaks actually ROBS power.

31 whole horsepower out of the new ones? The current "toy" makes that at half throttle, out of 1 cylinder... Do have to say the Savage will smoke it off the line though.

TOO MUCH horsepower... ;D

Fix the Trapp, remap the idle circuit, and do to your local stealership what I do to mine... pull in the lot, flip him off, and ride to a decent shop.
-WD

Title: Re: Backfiring like crazy
Post by theikeman on 07/18/05 at 22:52:19

I thought everyone would appreciate the stealership comment about powerful singles ;D. But, anyway, I did put the 7 discs and endcap back on the supertrapp and it is much quieter, but still louder than most (except HD's) and it still backfires, although not near as bad. I guess I'll tackle the idle circuit tomorrow and see what happens then. This is one GREAT board and I'm glad to be part of the Savage Family.
What else can I do to make my 87 better? I understand it came with a 155 jet in 87. Is there a way to replace the little white washer so often discussed here, without removing the carb?
Thanks for a the help, comments and tips
Ike

Title: Re: Backfiring like crazy
Post by savage_joe on 07/19/05 at 05:11:48

theikeman wrote:

I also have an 87 Savage, and I have been messing with the carb for a week now. Yes, you could do the white spacer thing with the carb still on the bike, but I do not recommend it! Our 87 carbs are different than most of the owners on this board. I put a half spacer in and it runs worse, and I also have a pipe on it, mine is a mac pipe. I put the white spacer in and it's better but still too rich just off idle. I am still trying to get mine dialed in, but I have definately learned that our older models do not suffer the super lean setup that the newer bikes have. Try to richen up the mixtue screw a bit, should help with the decel backfiring. Yes, our carbs do have the 155 main, so do a plug chop to see if that main is rich enough or even too rich. Best of luck...Joe

Title: Re: Backfiring like crazy
Post by theikeman on 07/19/05 at 21:25:29

Ok, did the idle mixture screw adjustment today, seems to idle best (fastest) at 2.5 turns, then used the idle thumb screw to lower the idle, tightened the exhaust bolts and it still backfires ..... ???
Help ???

Title: Re: Backfiring like crazy
Post by Greg_650 on 07/20/05 at 05:44:50

theikeman wrote:

Buy another set of disks. My spouse's is running 14. It is louder, but it has really good bottom end.

Title: Re: Backfiring like crazy
Post by roughrider on 07/30/05 at 17:27:26

I have been told two live with it. Great looking bike that sounds real bad!

Title: Re: Backfiring like crazy
Post by WD on 07/30/05 at 20:20:32

Ike, bring it to the shop Monday, as in, August 1st if you can. Mine got like that occasionally, I'll check yours and see if it is the same problem. Odds are, you have no header gasket, and likely, no center joint gasket.
-WD

Title: Re: Backfiring like crazy
Post by doppelganger on 07/30/05 at 21:45:29

What's the easiest way to check for the presence of these gaskets? Do you have to remove the header pipe, or just loosen it a bit?

If missing, where's the best place to get them?

Title: Re: Backfiring like crazy
Post by Savage_Rob on 07/30/05 at 22:49:50

You pretty much have to remove it to be able to see if you have the gasket and what condition it's in. I didn't know how bad mine was until I got a new one and saw what it should look like.

Title: Re: Backfiring like crazy
Post by theikeman on 07/31/05 at 00:22:01

Hey doppelganger,
I bought two exhaust gaskets for my 87 at the local Suzuki dealer @ 3.85 each. According to their parts manual there is only one gasket and it is the one at the head. I'm going to take the pipe off tomorrow (as WD suggested) and make sure there is a gasket, which I will replace with the new one.

Ike ;D

Title: Re: Backfiring like crazy
Post by theikeman on 08/15/05 at 23:35:25

Ok, backfiring solved!!
I replaced the exhaust gasket at the head, cleaned the inside of the pipe opening and exhaust port, replaced the Supertrapp with a HD Dyna muffler and made sure there are no leaks. Yeah!!!
It sounds much quieter until you open it up, then it sounds deeper and really nice. It also looks pretyy nice, especially with the 7" J C Whitney heatshield and I am happy with it.
Thanks again for all the great advice.
Ike ;D

Title: Re: Backfiring like crazy
Post by lancer on 08/16/05 at 06:33:14

At your next opportunity be sure to check your main and pilot jets to see if you are still running the stock items..............I just looked again and saw that your bike is an 87, so you may be ok with the stock jets. Read your spark plug and adjust the carb as necessary to get the correct air/fuel mixture.
RIDE WELL