maxthrottle
04-30-2002, 06:38 PM
OK, I put the DynoJet 155 main and needle in my 400EX.
I've got a Yoshi slip on exhaust, and a new K&N airfilter with outerwear...no holes in the air box.
I set the air screw at 3 1/2 turn out.
The engines starts great and idles fine. I haven't ridden it yet just playing with the throttle in the garage. As soon as I get to 3/4 to wide open throttle the engine winds up and then sputters. I've held the throttle wide open and have had some backfiring with an occasional 2" yellow flame out the Yoshi.
I tried the same thing with the air box cover removed, the hesitation at wide open throttle is still there but not quite as severe, does this mean the jet is too rich? Should I go down to the 150? How does the stock 146 equate to DynoJet sizes?
Do you think this will go away when the quad is ridden and there is a load on the engine or does it matter?
Any ideas?
I've got a Yoshi slip on exhaust, and a new K&N airfilter with outerwear...no holes in the air box.
I set the air screw at 3 1/2 turn out.
The engines starts great and idles fine. I haven't ridden it yet just playing with the throttle in the garage. As soon as I get to 3/4 to wide open throttle the engine winds up and then sputters. I've held the throttle wide open and have had some backfiring with an occasional 2" yellow flame out the Yoshi.
I tried the same thing with the air box cover removed, the hesitation at wide open throttle is still there but not quite as severe, does this mean the jet is too rich? Should I go down to the 150? How does the stock 146 equate to DynoJet sizes?
Do you think this will go away when the quad is ridden and there is a load on the engine or does it matter?
Any ideas?