Good Modds

[Macadoo355]

Well im looking into a big bore for my 400. I have a 41 fcr power roll carb and was wondering what it would run best on, 416, 427, 440? I would also be putting a pipe and a cam in it. The pipe cant be super loud I was thinking an HMF? And for the cam a hotcam stage 2? I ride mostly trails and gncc stuff but im going to the dunes this summer so the power has to get me though that trip. Would I have to change anything else along with the motor and pipe to have it run at its peak? Thanks, Ryan

[trx400EXtreme]

well, if it were me id get the 416. pretty good power gain and a lot more reliable than a 440. alot of times 440s tend to blow up, but it all depends on how good its built. dont quote me on this but ive herd that a 427 aint much better than a 416, power wise anyway. good luck.

[Macadoo355]

I heard the same thing I just wanted other imput, basicly im just looking for the power to get me through the 3ft of mud and up the steep rocky hills around here. I wanted the most power for the money.

[blasterandy]

Get a ute for 3ft of mud but it will get u up some steep hills

[CHEVYZ]

That crap about 440s is bull. I know 416s that have had nothing but problems, compared to my 440 which has been great. Whether it be a 416 or a 440, a poorly built engine is what it is. Build it right and you will not have any problems.

For your question, I would go with the 440, personally. Any of them can be built to be fast. It is really just up to which you prefer to choose.

[Macadoo355]

You guys think a nicely built 440 with a cam, pipe and the 41 mm carb would hang with a 450r or still get eaten alive?

[400exstud]

If you need a quiet pipe I wouldn't go with HMF. Their one of the loudest.

[Wheelie]

My stroker has no problem hanging w/ and beating lightly modded 450's.

A well built EX can hang w/the newer macines and still be plenty reliable.

[vett_09]

Originally posted by CHEVYZ
That crap about 440s is bull. I know 416s that have had nothing but problems, compared to my 440 which has been great. Whether it be a 416 or a 440, a poorly built engine is what it is. Build it right and you will not have any problems.

For your question, I would go with the 440, personally. Any of them can be built to be fast. It is really just up to which you prefer to choose.

Agreed. A poorly built engine is a poorly built engine, it doesn't matter what bore size. Still, the 416 is the best bang for the buck. If you want to do a 440, first you need to figure out how deep your pockets are and how much time you have.

[Macadoo355]

Im building my car the same time this is going down so I cant spend a ton of cash on it. Im looking into the 426 out of all of them. When I bought my carb it took the company 6 months to get it to me and they "forgot" to tell me it needs to be a modded motor to make it not bog out. The guy I talked to said it would run amazing on a stock motor and pipe, ya he was wrong. So moral of the story, I get a deal on either a 416 or a 427 kit from them at their cost and the shop I bought it from will cut his price in half because it took so long. So its going to be 500 without the pipe or cam, I dont think thats to bad. I would go with a 440 but building up a big block 502 isnt cheap :ermm:

[PismoLocal]

If I was in your shoes I would get an 11:1 426 kit, an 02 CRF timing chain, stage 2 hotcam, and a slip on pipe. If you want to it to be reliable as possible think about an HD stud kit too.

[Macadoo355]

The stud kit just for insurance? Do they blow out alot? I know my real motor needs the HD studs just for the high horsepower, is it the same with the quads?

[vett_09]

You could probably get away with using stock studs at 11:1, but I don't think I would try. They're not that much money and it'll be one less thing you'll have to worry about.

[lpmaster]

in my experience with mud, my stage 2 cam even with a 440 just didnt cut as well as i liked, i've only been tot he mud like 3 times, but i had a 426 with a stage 1, that would hang no problem, but with a 440 and stage 2 just didnt feel the same in the mud, but the sand.......well thats just different, im mpretty sure the cam had all to do with it.

anyways i put a 05 450r carb on a stock motor i think they're 42mm and it ran awesome, you have to jet it right to get it to quit bogging a 41 on a stock motor would be good, but it will be really good on a worked motor

[Macadoo355]

Its jetted right it just falls on its face when I really stomp on it.