australian 03 wr 450 backfiring on decel
Posted August 27, 2005 - 04:04 AM
i know that this subject has been covered to some extent and I have searched and read postings about similar problems.
after checking for all of the obvious faults
1. lean idle mixture.
when i pull on the hotstart with the bike idling the revs increase and infact i have to use the hot start to start the bike once it is warm 90% of the time, so im convinced the idle mix is tending to the rich side.
2. loose exhaust fittings .
I replaced the muffler - header pipe gasket as it looked sus and i got some improvement.
I still loudly backfire on heavy decel
I am running the standard 03 aus muffler (has only 20mm outlet)
i do not want to change muffler, the bike makes enough power for me and noise is becoming a problem where i ride
any suggestions would be great
Posted August 27, 2005 - 08:28 PM
Posted August 28, 2005 - 05:03 PM
Posted August 29, 2005 - 01:41 AM
Posted August 29, 2005 - 07:11 PM
My bike was so bad it was spitting blue flames about a foot out of the Procircuit with
the spark arrester in place. I got a mate to help me line it up properly and it has
stopped the back firing and changing the jetting actually does something!!!!!. It still has a bit of a bad popping when the throttle is closed so I think the gasket is still suss.
Put a 48 pilot in it and set your fuel screw. I can start my bike first touch of the button (or first kick for something different).
Posted September 04, 2005 - 04:02 AM
Posted September 08, 2005 - 01:47 AM