Ok I just have a few questions, please help me out.

*Did it make your machine any less reliable?

*Total cost for you (and what kit you got, and any extras)

*How much Horsepower (or atleast a guess)?

*and finally would you recomend the same kit you got?

 

BEFORE YOU GO TO GT. THUNDER CALL MIKE TREADWAYS LOCATED IN ZAINESVILLE OH. CLOSER THEN GT. THUNDER AND ASK HIM ALL YOUR QUESTIONS. I JUST HAD MINE DONE BUY THEM AND ALOT OF RACERS GO THERE. THEY DID A GREAT JOB. HIS # IS (740)452-1000. TRUST ME YOU WON'T REGREAT IT. I'VE BEEN TO GT. THUNDER. TELL JIM STEVE GRIFFITTS SENT YOU.

 

derek-thats exactly what i want to know!

 

Mhargrove, good advise. The 400ex is a fine atv, but guys axaggerrate how reliable they are when modded. Once you stray very far away from stock on the 400ex, reliability problems start popping up. A bud of mines 440ex sits about half the time waiting for parts to come in.

 

does anybody like there 440s?

 

ABSOLUTELY, I am very pleased with the results from my 440. Powroll did all the work for me and it has been rock solid for the past year now. Not a single problem and I mean not a single one. Of course I went a little on the mild side with some of mine like only a 10.5:1 piston but I knew I wanted some more reliability and I didn't want to run race gas. I also did other things and am still in the process of yet other mods, most of these have been aimed at the low end power. I did that on purpose because that seems to be where I am at most of the time riding. The difference to me was night and day and I do recommend it anyone seriously interested. I have also talked to other guys on here who have had very good results with their 440's and reliability not being a problem.

 

My 440 kit is awesome! It has been in since last April and I have not had a single problem. My bike is a full race 440. Everything that you can do to an engine mine has had it done. It has been 100% reliable over the past year. The only complaint I have is the 39mm FCR carb I have does not have a choke on it. When the temperature gets below freezing it is hard to start. It's a drag when my buddy on his Yamaha has to tow me to start it on those cold mornings.

 

Thanks guys, whats the highest compression I can go on without having to use race gas? And is race gas really "race gas" or is it just higher octane? I can get 107 (airplane fuel) for only $2.50 gallon? Is it the same?

 

Do not use airplane fuel. That fuel was deigned to be run at high altitudes with very little oxygen. I STRONGLY URGE YOU NOT TO USE IT!

 

WELL WE AT THE SHOP I WORK AT BUILT A 440EX...IT MADE RIGHT AT 34 REAR WHEEL HP ....WITH THE 440 HICOMP KIT AND WHITE BROTHERS TRACK CAM AND THE QUICKSILVER CARB AND THE XR250R REVKIT AND FMF PIPE HE HAD IT ALREADY....PRETTY AWSOME THE GUY WE BUILT IT FOR A CUSTOMER
HE LOVES IT .......HE RUNS CAM2 FUEL ..........
THATS WHAT I WILL BUILD TOO EXCEPT MAYBE THE KEIHAN CARB AND A PORT AND POLISH .....WHAT TO GET 40HP WILL SEE !!!!!!