big bore kit

[93dirtrider400]

still looking for information on more power for my 400! c'mon guys throw out some information! best big bore kit, cam, studs, and timing chain!!! let me know! would 416 be the way to go and what brand???

[rob_990]

je 416 10:8:1 -hotcams stage 2-gtt studs-crf450 timing chain

[93dirtrider400]

hey thanks a lot! where is the best place to order these parts from? and what does a 416 run against a 440 or sumthn like that?

[rob_990]

i got all my parts from my dealer cause it was cheaper or else you can try ebay the piston,service honda for the chain,and rockymountain for the valves and gaskets.

im not sure how it runs against a 440.ive never rode with one before.i just did the 416 cause it runs cooler and it leaves room to bore more in the future

[Whit11b]

Try a 450r carb and full exhaust. A lot of stuff on Ebay, some really good deals on there in general if you look around. Check out magicracing.com, I like them cause they are my local shop and their prices are competitive at least. They have a Namura 440 kit (http://www.magicracing.com/Namura-440cc-Big-Bore-Kit-Honda-TRX400EX_p_252.html) and a complete cylinder (http://www.magicracing.com/TRX400EX-Big-Bore-Cylinder-Kit--440cc-89mm_p_6237.html). But the price on the complete cylinder isn't that great. I've never used Namura stuff so I can't say how good it is. Atv Galaxy has a exhaust package here (http://cgi.ebay.com/ebaymotors/Honda-400EX-HMF-Exhaust-Pipe-Dynatek-CDI-KN-K-N_W0QQcmdZViewItemQQhashZitem588385b708QQitemZ3801 63700488QQptZMotorsQ5fATVQ5fPartsQ5fAccessories) that looks like a fair price. Full exhaust systems go for $435-$440 on ebay. Look around for used stuff, you can probably find low hour parts for a big discount.

[TRXRacer1]

I was going to correct a couple bits of info and contribute to your question but then I thought how easy this is to find just by reading posts. You wouldn't even have to use the search button, just scan through a couple pages.

[93dirtrider400]

Hey thanks a lot guys!!!!! Im a new guy here on atv rider so thanks for helping me out!!! If anyone else has any info thats great! rob_990 you were saying something about the je piston>>>>> have you heard any on wiseco or how are they rated?

[rob_990]

ive never used wiseco i went with je cause my dealer said he thought they were made better but you should be fine either way.alot of people on hear run them

[93dirtrider400]

ya I hear ya! thats probably what il go with! does je make a kit that comes with pin rings and gasket or is it just the piston?

what about the 426? all i do is mostly ride the dunes and right around the house so between the 426 and the 416 would yall still go with the 426?

[rob_990]

ive never heard of a kit that comes with gaskets.i just used cometic.you can also use a xr400 head gasket it you want cause it raises compression a little cause its thinner.thats what i used to run before i did my rebuild.

[93dirtrider400]

alright! i have had some in put on putting a 426 in! I'm bout 200 pounds and ride mostly in the dunes! what you think? still go with the 416? what about the guys with the 426? what do yall think?

[400exfirebrethr]

i would go with the 426 because you ride dunes and wouldnt have a problem with overheating but i would suggest the 416 for trail riding if you are worried about temps

[odog]

i say go big but i guess any bore is ok. i did a 460 stroker because i messed my crank and piston up. my mechanic told me to just go to a 86mm bore and buy a heavy duty crank. but since there are more bigger bikes that i ride with and price and labor wise it was going to cost me maybe 100-200 dollars more to do the bigger kit i went with the bigger kit. and now since i added that fcr carb i have a very very fast ex. i would race any stock or slightly modded bike. and not have any worries at all.

[93dirtrider400]

alright guys thanks a lot! i thought about putting a 460 crank assembly in but not sure yet! is it fairly reliable? any problems? how much? what brand?

[93dirtrider400]

hey 400exfirebrether does je make a 426 kit? and what you pay to get it port and polished?

[TRXRacer1]

Originally posted by 93dirtrider400
hey 400exfirebrether does je make a 426 kit? and what you pay to get it port and polished? JE makes that kit. They even make a couple sizes more then most. The P&P will show little to no gains. It's just the latest boutique modification.

[93dirtrider400]

aite ya yall talk about je making kits but i cant iver find them! where do you go?

[TRXRacer1]

Up until 88.5mm you don't need anything but the piston, rings, clip and pin. A standard piston kit like that can be found anywhere from the site sponsor to ebay. I got my last one on ebay. CT Racing has good prices too.

[trx460stroker]

Stroke and big bore that **** Hot Rods 4mm stroker crank with the 89mm CP high compression piston! it will be worth it!

[TRXRacer1]

Originally posted by trx460stroker
Stroke and big bore that **** Hot Rods 4mm stroker crank with the 89mm CP high compression piston! it will be worth it! With 450's everywhere for a fair price we are far past calling mods like that "worth it".