Thanks it helps a lot if i need anything else ill get ahold of you on here you helped me out a lot i appreciate it.

 

The timing degree key goes in before you put your flywheel on, It advances your timing to start the burn of your fuel earlier which is why you up the octane (so you'll have to run premium) , gives you alittle more power The timing key also greatly increases throttle response and faster acceleration

Your welcome, Karson

 

Im not trying to argue or anything but its okay to put the timing key on a high compression engine (I am aware that it makes the engine run hotter), my buddy had a 440ex larger oil cooler and shiz ton of peformance mods i dont even think i can list, but he had the timing key install on there about a year ago and she still runs like a beast, and to Dragracer get a cdi box most defiantly because Honda's rev out much quicker than most of the other racing quads out there in the 400 class.

 

I know some people do run the sparks timing key with high compression pistons. You are right, running hotter is the consequence. With the ex being air cooled it is not a good idea. Especially because the 400's pull head studs when they get to hot. Also the cooler they run the more power you get out of them. Now if your bud with the 440 went to a stock key it would lower the temp some (gaining power). Then shave the flywheel. Shaving the flywheel make it rev out as fast as you want, to a point. The more you remove from the flywheel the faster you rev out.
The sparks key advances the timing 6 deg. There is a guy on ebay who makes a timing key that advances the timing 3 deg and it is safe to run with a high comp piston. The 3 deg key wont make the motor generate excessive heat and it gives you better than stock throttle response.

 

i was thinking of getting a big gun rev box some people say they are worth it and some say they aern't. id rather not run the timing key cause i don't have a larger oil cooler at the moment so im trying to watch how hot it runs.

 

Considering you have stage 2 cam, p&p and high comp piston. A rev box will help.

 

ok thanks ill def. get one now since i know its ok to run it.

 

Another cheap mod is chain drive sprocket sizing/gearing. The 1st # is the amount of teeth on the front sprocket. The front sprocket is the quickest and easiest to change(20-30min), as well as being the less expensive one($10-$20). The 2nd # is the amount of teeth on the rear sprocket. Sprockets do not give you HP, instead sprocket sizes determine your final drive ratio, delivering the power to the drive axle(rear axle). For example: a 12/40 combo will launch you off the starting line like a rocket, but you will be limited to 60mph in 5th gear WAO(wide *** open). while a 15/38 combo while launch you off the starting line more like a VW Beetle, but you may be able to approach a top speed of 80mph in 5th gear WAO. ( could take as much as an 1/2 mile ) I have tried every combo possible on my EX, and I have a list of which combo works best with what you will be doing. I see you may be drag racing, will it be a 1/8 or 1/4 mile??? and how big of a flat track will you be on??? What kind of trails do you ride on, flat and smooth, steep and rocky, ect????

 

I have also done a few low budget EX builds, with good results. I have around $3000 in my current EX including the purchase of the quad. I can't pass a 450r, but they can't get away from me for the most part. Give me a idea of what you will be doing with your 400. Example: 75% steep rocky trails, 15% 1/8 mile drag racing, 10% barrel racing, and I can give you some affordable ideas.

 

I would be doing 300ft drag racing and i dont know how big the flat track is i forget if my friend said if it was i think he said it was a 3/4 mile D shaped. At my house i have fields and some wood areas so basically all smooth flat.