GStwin.com GS500 Message Forum

Main Area => General GS500 Discussion => Topic started by: tdan553527 on March 17, 2005, 01:49:51 PM

Title: Backfire question
Post by: tdan553527 on March 17, 2005, 01:49:51 PM
OK, after rejetting, everything seems fine, runs great, but if I blip the throttle I get a small backfire, sounds like it is coming from around the carbs.

20, 62.5, 137.5
UNI Drop in
Wileyco

What is causing this?
Title: Backfire question
Post by: tdan553527 on March 18, 2005, 06:59:32 AM
Anybody?
Title: Backfire question
Post by: dgyver on March 18, 2005, 08:07:15 AM
A little popping is typical when you open up the exhuast to be more free flowing.
Title: Backfire question
Post by: Rashad on March 18, 2005, 08:13:17 AM
Dgyver, hes backfiring through the intake.

Sounds like maybe a valve problem? Mine did that when i bent two valves.

Did it run ok before the rejet?

Ill wait for srinath to comment here.
Title: Backfire question
Post by: tdan553527 on March 18, 2005, 08:22:08 AM
Yep, ran fine before the rejet. It runs fine now too, now it doesn't do this everytime I blip it, only occasionally.
Title: Backfire question
Post by: suzukimad on March 18, 2005, 12:51:19 PM
:o same here...It happens around 1400 rpm,when you close off the throttle.

i found it to happen when its not that warmed up.
Title: Backfire question
Post by: sprint_9 on March 18, 2005, 02:12:55 PM
Sounds like it might be loading up, a little rich at idle.  Thats my guess.
Title: Backfire question
Post by: cernunos on March 18, 2005, 02:51:20 PM
What if the slides are coming up to quickly. I know that on an HD if you get too lean of a shot on throttle application you will get a backfire through the carbs. Also does it on automotive engines. Seeing as how the little Baby does not have accelerator pumps I would think this could be plausible. I love my freshly washed Baby and this forum.

C.......