Fellas,

Purchased my 400ex during the beginning of June here in Georgia. This is my first quad and I have found the learning curve to be very steep. I am having no problems with keeping up with the others now. My question is: I am putting FMF's powercore IV w/spark arrestor (cause I do so much trail riding) and rejetting (K&N). When I purchased the pipe I thought I was getting the full system. When I went to drop my quad off and look at my new FMF I found it to be only the muffler. How much power will I miss out on by not using the full system? Is the headpipe really worth $200? Also, I keep seeing people talk about 14 teeth counter sprockets on their 400's. I dont ever get my 400 into 5th gear on the trails. Would a 14 tooth sprocket help my acceleration so I can use all of the gears? Thanks.

 

the Honda stock head pipe is very good. unless you do alot of engine work, I wouldn't replace it. I have a slip on Yosi pipe and it made a world of difference with a filter/jet kit. As for the sprocket, one word, YES!!! Dropping a tooth on the front makes a BIIIIIG difference. Climbing hills and trails are much better. One the best $20 investments ever.

 

Thanks,

Went and picked up my ride Friday and havent gotten to ride it yet. The FMF pipe sounds really good. I hope I gain as much as I am expecting. How difficult is it to change the Front sprocket? I dont feel like paying the dealership any more money. Thanks again

 

Changing the front sprocket (counter shaft gear) is really easy. First, loosen the two bolts on the rear of the axle, push the axle forward by putting a small bar in one of the notches on the left side, take the cover off the gear, take the gear off. Then put the new one on and reverse everything and adjust the chain tension properly. The adjustments specs are in your manual.

 

Welcome, you will love your wheeler /an this board of atv info// there is alot of good stuff on here ,an some trash too, but all in all the guys here won't point you wrong.
I have a 400ex 00' too,and I enjoy it for trail riden an dunes they are a great all around ride/not much of a drag racer but they were not built for that either. Keep the shiny side up an the dirty side down an have fun with it later,rick{nv}

 

Well to me it was worth the $200. I ride MX and Dunes and it incresed the hp a couple.. As for a 14 tooth front sprocket.. For trail riding I recommend it. I run a 14/39 for the dunes and back to stock 15/38 for MX or just screwin around