Jetting...

[Chris#37]

Afternoon guys and girls!

Weekend just passed i raced at Snett 300 and finished top rookie all 4 races so chuffed with that but...

The bike is running really rich so when i finish the race it just stals and is a bitch to start again! What is the secret in jetting the 400 right, whats better keeping it rich or running it slightly leaner??

Much help needed!

Chris

[Deswilkie]

Don't run lean it'll over heat. The ZXR's have a known hot starting problem and there's a bit of a knack to starting an engine that's just been through ten minutes of thrashing.

What are you running now? and is it with ram air, open/blocked air correctors etc?

Just to give you ball park figures with ram air;
open air correctors 132.5 main kehins
blocked air correctors 106 main dynojets

Cheers
Derek

[Chris#37]

Derek

Thanks for your reply mate!

I am running the ram air box, when racing at snett i had to open the ram air box so it isnt sealed completey, was before hand!

Seems to be running fine top end but the exhaust is black after a race to indicate it running rich!

???? confused.com

Chris

[Deswilkie]

Aye running rich in that case; what jets you got in it just now? and blocked or unblocked air correctors some dyno time'll pay dividends

[Chris#37]

Sorry guys im not the most technical person in the world...

What is and where would i find out about Blocked or unblocked air correctors???

Sorry num nut here lol... i just ride it lol...

[Deswilkie]

Have a look on this thread. There's a theory that by blocking the air correctors gives better fuelling/power at the top end. I've tried both and never really noticed a difference.

viewtopic.php?f=37&t=12143