XJR400R2 Madmax exhuast carb retune info.
Posted: Sat Jul 18, 2015 5:04 pm
Ok here is what I have been up to lately just finished re-jetting the carbs after fitting this....
http://japan.webike.net/prv/detail/1001223/p21400162/
From standard 20345 miles great condition engine standard airbox with 4 degree advance ignition.
Standard Main jet size 90
Standard Pilot jet size 20
Standard Needle clip 3rd up from bottom
Standard exhaust
Valves adjusted 3000 miles ago, so she was running sweet as a nut in standard form only problem was the standard exhaust manifold was rotten and would not have passed it next mot....so I purchased the madmax exhaust (see link and read my review) but with standard jetting she ran way to lean so I purchased a jet kit online. Now I did have some concerns over this service and I was proved somewhat right when they sent me the wrong model pilot jets BUT that did not faze me as the size they recommended was just what I had as stock anyway so result.
So I was sent 4x 95 main jets and 4x 100 main jets (just in case), so I first installed the 100 mains and this was to rich so popped in the recommended 95's and raised the needle one clip plus turn out the fuel mixture screw 1/2 turn well I turned it 1/2 turn out from my known good running settings and she is running great.
Going by spark plug color from idle to 1/3 throttle which is just where I want it, I now get a nice chocolate brown arm with a tan colored insulator just how it should be.
So just to cover it again from a good running standard engine running below 1500 feet above sea level all I changed was 95 main jet 20 pilot jet needle clip is 2nd up from bottom and 1/2 turn out from standard on the fuel mixture screw.
I think that about covers it? if not I will add it as and when asked or remembered.
20/07/2015 UPDATE INFO
Ok after today's mess I have dropped the needle back to standard and she seem's alot better and the plugs look much better.