AIR BOX LID
Aug 20, 2000 | 10:11 PM
#1
Thread Starter
|
Trailblazer
Joined: Aug 2000
Posts: 40
Likes: 0
I JUST REMOVED MY AIR BOX LID OFF MY 2001 400EX AND SOUNDS BETTER AND ALSO IS A LITTLE MORE SNAPPY JUST WONDERING IF I SHOULD REJET OR NOT AND WHICH MAIN JET I SHOULD USE.. I THINK STOCK IS A 148 BUT IM NOT SURE...
Aug 20, 2000 | 10:20 PM
#2
Pro Rider
Joined: Aug 2000
Posts: 1,032
Likes: 0
Just depends on what the plug looks like. That'll tell you how the bike is running with the added air flow. I hope you got a K&N filter with a outerwear. That should take care of the dirt, just watch out for deep water.
Aug 20, 2000 | 11:04 PM
#3
Pro Rider
Joined: Jun 2000
Posts: 223
Likes: 0
actually,
K&N filters, even with a precharger are only good in sand conditions where the granuals are large..
Fine dust and dirt could enter the engine with a K&N, I just recently took my K&N off, and put the stock filter back on.
The 400's are usually jetted lean from the factory, removing your airbox lid probably made the bike run even leaner, then adding a K&N would make it run alot leaner. If i were you, I'd get a dynojet kit, and use a 142 with stock filter with a large rectangualr hole cut out of the airbox lid with a screen on it. This setup seems to work fine for me, but you'll have to read the plug to see what's up with yours.
When i did have my K&N with precharger, i ran with no lid, and i had a DYNOJET 165 main in. it ran perfect... but then i saw alot of fine dirt getting into my airbox hose that goes to the carb, so i rejetted down to a 150 Dynojet, and put the airbox lid on. SAME problem, alot of dirt getting into the engine.
After that i put the stock filter back on and modded my airbox lid.
PS: Dynojet uses different numbers, so don't think i am an idiot and jetting way to high or low.
K&N filters, even with a precharger are only good in sand conditions where the granuals are large..
Fine dust and dirt could enter the engine with a K&N, I just recently took my K&N off, and put the stock filter back on.
The 400's are usually jetted lean from the factory, removing your airbox lid probably made the bike run even leaner, then adding a K&N would make it run alot leaner. If i were you, I'd get a dynojet kit, and use a 142 with stock filter with a large rectangualr hole cut out of the airbox lid with a screen on it. This setup seems to work fine for me, but you'll have to read the plug to see what's up with yours.
When i did have my K&N with precharger, i ran with no lid, and i had a DYNOJET 165 main in. it ran perfect... but then i saw alot of fine dirt getting into my airbox hose that goes to the carb, so i rejetted down to a 150 Dynojet, and put the airbox lid on. SAME problem, alot of dirt getting into the engine.
After that i put the stock filter back on and modded my airbox lid.
PS: Dynojet uses different numbers, so don't think i am an idiot and jetting way to high or low.
Aug 21, 2000 | 01:46 AM
#6
Pro Rider
Joined: Mar 2000
Posts: 458
Likes: 0
I thought the jet number corresponded to the size of the hole in the jet (155 = .155cm hole). If that's true, why would the dynojet 165 run different than the 165 I bought from the Honda shop?
I'm not disagreeing with you, you're probably right... I've just always wondered what's so special about the Dynojet kits that makes them better than buying each jet as you need it(and saving some money at the same time).
I'm not disagreeing with you, you're probably right... I've just always wondered what's so special about the Dynojet kits that makes them better than buying each jet as you need it(and saving some money at the same time).
