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Message started by bigvl800rider on 01/12/07 at 10:04:37

Title: still backfiring
Post by bigvl800rider on 01/12/07 at 10:04:37

did the rejet to 155 main and 55 pilot. new plug dpr7ea9-all i can find here. 1/2 white spacer mod done. adjusted the idle screw, air/ fuel screw (drilled the plug) and the dang thing is shooting flames 6-8 inches out of the screaming eagle. only a 20g shotgun sound now. i put the muffler on with flexible pipe as it would not line up. is this bad? seems to have a good seal. ideas? no smell of raw fuel. HELP ME!!!

Title: Re: still backfiring
Post by Dynobob on 01/12/07 at 11:44:10

You probably have exhaust leaks. That could make your bike backfire like a 20 guage. Check for intake leaks as well.

Title: Re: still backfiring
Post by bigvl800rider on 01/12/07 at 11:46:23

pretty much what i was thinking. gonna get wrenching and get a real pipe bent as an adaptor. love the sound now. intake side is good and sealed. exhaust is questionable. thanks for the input.

Title: Re: still backfiring
Post by Savage_Rob on 01/12/07 at 11:51:28

Dynobob wrote:

You probably have exhaust leaks. That could make your bike backfire like a 20 guage. Check for intake leaks as well.

I agree completely. If you've already tuned your carb, that's where I'd look next. I had retuned my carb quite a few times before replacing the exhaust gaskets but replacing both gaskets cured my problem. If you haven't tuned the carb, try reading Lancer's Straight & Simple Carb Tuning in the Tech Ref forum.

Title: Re: still backfiring
Post by bigvl800rider on 01/18/07 at 15:16:28

svage rob, with the k&n and rejet, could i run the stock muffler with any problems? i can drill the muffler if needed.

Title: Re: still backfiring
Post by Savage_Rob on 01/18/07 at 18:00:24

bigvl800rider wrote:

svage rob, with the k&n and rejet, could i run the stock muffler with any problems? i can drill the muffler if needed.

With the stock muffler, you don't need to use a K&N but rejetting to something like a 150 and tuning the carb will help. Personally, I wouldn't drill the stock muffler. To free up some more power, I would use a freer-flowing muffler and rejet. The K&N is optional but I believe it makes a difference.

Can anyone who has actually drilled their stock muffler report their results?

Title: Re: still backfiring
Post by john1652 on 01/18/07 at 18:10:28

I was just thinking this too if you took the snorkle out or drilled the air box that could certainly lead to lean problems. When I put one of them on my bike it didn't backfire , well yes it did but just a little. and I thought maybe about goin up even to the next jet size. I run 155 that's a pretty open pipe why not try next step up in jetting or if you did airbox mod cover em up. it has to be too lean. john

Title: Re: still backfiring
Post by bigvl800rider on 01/18/07 at 18:15:32

hi john, hows it going? i did the 155 main and 55 pilot. i still havent got to fit the exhaust properly. i got to get time to figure angle of bend. not like im going anywhere as its gonna be snowing here right shortly. anyway, i did not drill the air box, just a k/n drop in. intake is not leaking. header pipe is tight. i still have the flexible exhaust pipe on to the muffler. father in law told me it his on his generator also leaks. guess as soon as i can i will get a pipe fabbed up. thanks for the info.

Title: Re: still backfiring
Post by steelwolf on 01/18/07 at 18:16:03

I drilled out the stock can. I kept it on long enough to replace it with the open pipe. It sounded like crap and the performance difference was not noticeable. I also drilled holes in my air box door and that too was a mistake. YMMV

The degree of bend for the adapter pipe is 10*.

Title: Re: still backfiring
Post by flywest on 01/20/07 at 02:39:34

:) Hi Steelwolf, I have yet to do any Mods to my bike, why do you say that drilling your air box door was a mistake? ???.

Title: Re: still backfiring
Post by justin_o_guy on 01/20/07 at 14:47:23

I poked 1 hole inside the muffler.Used a 3/8 bit, had to start it with a dremel type tool with a little metal grinding burr to give the drill bit a place to grab, then held the bit at an angle & drove it sideways till I had a good enough spot to drill on. Pushed & shoved & finally got the hole in it. The sound? Not low, not a rumble. sounded like someone trying to whistle but couldn't, just pulsed hard blowing.The Supertrapp is soo nice.

If I had it to do over I wouldn't mess the stock muffler up.

Title: Re: still backfiring
Post by steelwolf on 01/20/07 at 17:07:33

flywest wrote:

:) Hi Steelwolf, I have yet to do any Mods to my bike, why do you say that drilling your air box door was a mistake? ???.

I was getting WAY too much air for my mix. Some here have done that mod and had no problems with it. I don't think it's a bad mod, it just didn't work out for me with my set up.

Title: Re: still backfiring
Post by verslagen1 on 01/20/07 at 17:29:36

If you're running rich, it'd be a good mod. ;) Otherwise it's going to make the backfiring worse. :o Try the snokel mod first, then remove the door to check it out. 8)