Backfire through Throttle body

[Wrecka]

Reseated the filter last night and tightened it all up , did what Hanso suggeested and rode to work this morning without doing a throttle blip on change down , no probs not on backfire.

Yesterday just as i pulled up from the ride home i did a stationary test , blip throttle followed by a second one with no pause and it backfires nearly every time ..............

 

[CanberraR3]

Doctor, it hurts when I do this.....

 

[Wrecka]

Doctor, it hurts when I do this.....

?

 

[Jabol]

Well got my ramair filters in mail and was planning to install them this weekend but after reading problems with backfire decided I want to have my bike dyno tuned instead of using a generic tune. Called dyno shop I used before just to find out they're supposedly out of business (fastbikesusa), now I have to find competent shop that will work on my bike and one I can trust. Anyone knows respectable dyno shop in west Michigan?

 

[Jabol]

Wrecka, I'm not an expert on gasoline engines but 1st thing I would do is get a free flowing exhaust. You're sucking in a lot more air but you're still restricted on the back end, that air has to go somewhere I would think and if it's not through the exhaust its through the place it entered. Good luck anyway, hope you figure it out...

 

[CanberraR3]

Reseated the filter last night and tightened it all up , did what Hanso suggeested and rode to work this morning without doing a throttle blip on change down , no probs not on backfire.

Yesterday just as i pulled up from the ride home i did a stationary test , blip throttle followed by a second one with no pause and it backfires nearly every time ..............

Doctor, it hurts when I do this.....

?

Sorry mate. I wasn't having a dig; just made me think of that old Henny Young joke.

The patient says, "Doctor, it hurts when I do this." "Then don't do that!"

 

[Rough-but-slow]

My concern is that you said it has done it since day 1 if that was the case you could get the stealer to look at it. The boys here are right though the more air the leaner the afr upping your old map 6% across the broad would give you a reference point but it needs to be dynoed. Theres a guy up your way I believe who uses tune ecu so you won't need a pc and the like to set it. Probably be better to set all back to standard if you can't get it dynoed though. Good luck mate.

 

[charlie farley]

Have you tried checking for vac leaks mine used to pop back in the air filter(im running ram-air and open exhaust as my avatar +hanso tune 10%) but after i changed the MAP sensor vac pipes it hasn't done since .