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General Category >> Rubber Side Down! >> Backfire eliminated.
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Message started by Brewbrother on 05/26/06 at 15:06:02

Title: Backfire eliminated.
Post by Brewbrother on 05/26/06 at 15:06:02

I was having a problem with a backfire when shifting from second to thrid, after doing upgrades. The source of the problem was leaks in the intake overtighted the gear clamp pinching the blastic boot, and the header bolts had backed out about half a turn. Quick fix, just a small blow to confidence. I would add that when you do your exhaust upgrade, check the header bolts. I suspect they backed out while I was convincing the slash cut to fit properly.

Title: Re: Backfire eliminated.
Post by 911radioman on 05/26/06 at 15:28:41

I think I've got mine pretty much stopped now with the exception of the occasional pop when upshifting from 1st to 2nd, and that is more of a pop than a backfire.

After putting the new header gasket on and going through the series of torque-downs, I then put a little more torque on the muffler clamp and that seemed to seal the deal. Now I'm running 1-1/2 turns out on the idle mix, the bike is in its happy zone and I'm happy too.

My thing, I'm still not certain as to what are "normal" pops and what are backfires on these bikes. ;D

Title: Re: Backfire eliminated.
Post by Brewbrother on 05/26/06 at 15:36:53

911radioman wrote:

I've been riding for 30 years and have no idea, but I suspect that singularity of the system means that its just something to be lived with. Its the price you pay when a motorcycle is designed to meet government standards and not customer expectations. The bike is a basic motorcycle which I appericiate greatly. Its a joy to wrench on a bike that has all the parts ready and willing. With my last bike with 4 carbs and 4 cylinders and two coils you could chase faults for hours. Now you just have to follow the line from intake to exhaust. I have spent more time removing the tank decals than I did doing the white spacer mod.

Title: Re: Backfire eliminated.
Post by Reelthing on 05/26/06 at 19:47:06

heavy thoughts - but so far as the exhaust bolts - it seems to take a couple shots at to full crush the gasket and until it is this seems to happen - or as you say doing battle to install a new muffler does it as well

Title: Re: Backfire eliminated.
Post by Lion on 05/27/06 at 11:47:05

Reelthing wrote:

or as you say doing battle to install a new muffler does it as well

I have the same problem: it still backfires after changing the main jet, white spacer mod, pod air filter, platinum spark plug. So you mean changing the muffler to a bigger flower one will stop backfiring?

Title: Re: Backfire eliminated.
Post by Brewbrother on 05/27/06 at 16:50:52

Lion wrote:

Intake, fuel, spark and exhaust. If you up grade the fuel system, then you have to increase intake of air, better spark and elimination of exhaust. My mods were K&N drop in, iridium plug, 1/3 spacer and a slash cut sportster muffler. My backfire was because I was leaking air coming in and exhaust coming out. It created a backfire when I accelerated from 2nd to 3rd. I regained a balance and the bike seems fine. I still sometimes get a very small fart when I shut down, but its usually after I have been pulling hard on the throttle. Funny how you can suffer from lean and rich conditions with the same bike. Just last week I was crusing the long way home and had a little throtle fun, got my 2nd to 3rd backfire then when I pulled into the gargae and shut the bike off I got a little fart from the exhaust. Sounded like my wife blowing out a candle.

Title: Re: Backfire eliminated.
Post by Lion on 05/28/06 at 01:37:26

Brewbrother wrote:

Sounded like my wife blowing out a candle.

Wow man you are a poet in your soul! ;)