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Jetting...
Posted: Tue Mar 29, 2011 2:28 pm
by 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
Re: Jetting...
Posted: Tue Mar 29, 2011 6:20 pm
by 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
Re: Jetting...
Posted: Wed Mar 30, 2011 4:11 pm
by 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
Re: Jetting...
Posted: Wed Mar 30, 2011 6:23 pm
by 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
Re: Jetting...
Posted: Thu Mar 31, 2011 3:17 pm
by 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...
Re: Jetting...
Posted: Thu Mar 31, 2011 10:45 pm
by 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