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View Full Version : Another Carb question.....



BladeRob
11-15-2007, 03:28 PM
I'm sure I've read it somewhere, but I cant find it now so............

Regarding the pilot mixture screw and pilot jet - how many turns of the screw are equivalent to going up a size in the jet?

Thanks in advance, Rob;)

drew416ex
11-15-2007, 05:05 PM
Im not sure. I think it is like if you are above 3 1/2 to go a size larger or if its below 1 1/2 turns to go down a size.

BladeRob
11-16-2007, 01:28 AM
Thanks for that.

If I am currently at 3.5 turns out and I go up a size in jet, how many turns out should I set the screw?

QuadManiac
11-16-2007, 01:35 AM
Start at 1.5 and work out from there.

BladeRob
11-16-2007, 11:48 AM
Will do. Sounds as if there will be lots of tests to get the jetting right. Does any-one know where I can get something like the mixture screw in the photo for a 2005 400ex?

CarGuy7a
11-16-2007, 07:31 PM
they don't make those for 400EX's i was trying to find one for mine as well. those are for the FCR carbs.

your best bet would be to buy the tool from motion pro. def the best tool i bought.



http://www.motosport.com/offroad/productDetail.php?prodId=214992&nav=&sMMY=

GPracer2500
11-16-2007, 08:16 PM
^ I've got that same tool. Works good!

BladeRob
11-17-2007, 01:37 AM
Thanks for that. Just ordered the Motion Pro tool.

Cheers, Rob