what sprocket sizes should i go with to make my bike do 65-70.also when i do this what mods should i also do i have a slip on white brother e2 already.thanks

 

If your quad is stock,getting that kind of speed out of it is almost impossible, stock top end is about 54mph, you are trying to get 15 or more on the top end, you will have almost no bottom end, and it will take forever to get wound out. Also, it is a fairly narrow and short wheelbase quad, at that speed, it would start to get twitchy and handling would get dangerous.My son runs 400ex a arms and shocks up front,with a set of spacers on the back, this keeps him more stable at speed, and with his pipe and modded air box with a 1000+ rpm cdi, he keeps up with my Wolverine, which tops at about 58 or so. I'm not saying it's impossible to get that speed, but you will need engine power to get there, the rpms to keep the speed, and suspension to keep you safe at that speed.

 

I have a stock 300ex and i top out at 58mph with just a UNI airfilter and no air box lid

 

I just put a Uni on my son's 300ex and it is running lean (no muffler mod yet). What jetting did you go with?

 

I never had to jet up i ran with the air box at first and it was a tad bit lean so i cut holes in the botton of the box and it ran fine but i just took the lid off and left it b/c i do alot of racing and soon to be piped and bigger carb probly K&N and hopfull later on a bore kit getting my intake ported this week

 

I put a K&N air filter on my girl friends lil brothers 300ex and i never had to jet it it ran lean so i called the dealer and they said i had 2 options either jet up, or take the air box lid off and try it and if that didn't work take the box off (witch we did take it off he races a bunch of his friends and cousins) so it was better to take it off and get more air just mean cleaning the filter more often

 

Thanks. I have the airbox but cut part of the top open and I am getting a lean condition. I'll try going up one on the main and see.

 

i would try jetting up 5 points and see what that does.

 

Will do thanks.

Does anyone know what the stock main jet size is? I found it on the internet once but can't find it again. I guess the stealer would know.

 

[quote]
Originally posted by: inthedirt
Will do thanks.

Does anyone know what the stock main jet size is? I found it on the internet once but can't find it again. I guess the stealer would know.[/q


thats something i can't help you with, would have to look it up. Im sure the dealer knows