back fire wr450 08

hi lads just fitted a new leovince silencer its sound good but a bit loud and now there flames comeing out when i back off the throtal/speed,how can i sort this and is there a way to make it a bit quieta for MOT when i need to. UK.

thanks peeps

hi lads just fitted a new leovince silencer its sound good but a bit loud and now there flames comeing out when i back off the throtal/speed,how can i sort this and is there a way to make it a bit quieta for MOT when i need to. UK.

thanks peeps

Is it a true back fire, or just 'popping'?

just 'popping' but does sound like back fire mate

Lean it out. It's too rich....especially if you opened up the exhaust.

ok how do i do that the easy way lol.

thanks

ok how do i do that the easy way lol.

thanks

Put a kink in the fuel line.........:thumbsup:

No, it's not too rich, it's too lean!

You need to remove your AIS system and block it off (if it has one), change your pilot jet, and adjust your fuel screw.

do i turn it in or out and where can i get the AIS system kit from in the uk.

thanks mate

do i turn it in or out and where can i get the AIS system kit from in the uk.

thanks mate

First, do yourself a favor and read the stickies at the top of the forum

Next, re-jet and un-cork, and add an adjustable fuel screw

Then do a AIS block off, if you have one.

Google Search is your friend for parts in the UK.

No, it's not too rich, it's too lean!

You need to remove your AIS system and block it off (if it has one), change your pilot jet, and adjust your fuel screw.

+1 Too lean of a pilot jet.

ok thanks

hi again lads i was told to unscrew my mixture screw a bit at a time to get rid of the poping when i let off the revs well i did and its poping more now and it don't feel as powerful, am i doing somthing wrong or have i got to keep unscrewing till the poping gosaway.

thanks

I would suggest going to a 168 main jet and 48 pilot jet. Put in an adjustable fuel screw and turn it out 1 3/4 turns to start.

thanks mate where can i get this in the uk

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