350x the way I like it, with a wide ass

[SWIGIN]

ok i just search 400ex carbs, and honda says its 35.5mm......and i thought a 350x carb was a 35mm

the only reason they might run better with a 400 carb is that it is a newer desighn and not all cloged up yet.

[Dirtcrasher]

Can someone PLEASE tell us correctly where the carb is measured to determine the MM. Is it inside the inlet (where the air box feeds it) or the outside of the inlet? I'd imagine the ID is whats important....

The size of the 350X carbs has been questioned before. To my knowledge, both the 85 and 86 are the same size. I have them both and I can double check them again, but thats what I found and that was the ID of the inlet.

I'm gonna say that the 450R carb would be too much for the 350X. Maybe it could be jetted down but I'd think you want some serious mods before you plan on running it. What type of HP does a 450R motor make?? Most guys seem to be quite happy with the 400EX carb and no AB lid, Aftermarket exhaust, middle of the road high compression and some porting and polishing which none of us seem to know how to do it correctly by ourselves anyhow.... I'd think the 450R carb would be suited to a 430kit or the type of monster SWIGIN is making.

I'm interested in the 38MM carb Jason mentioned, just not sure what OEM model ran one that we could try.....

[The Goat]

thanks guys, I'll see if i can get one measured sometime this coming week.

i will be heading down that way syko...though i have to be back here for 9 am sunday morning.

IT'S MARDI GRAS PEOPLE!!!!

in the words of a very great man "drink and be merry"

[SWIGIN]

carbs are measured on the motor side of the slide....or in other words just on the outlet side

the inlet or venturie (spelling?) size means nothing

[scrawny]

my stock 450R made 38 hp with the stock pea shooter exhaust. my big bore stroker 350x made 35 hp race ready on race gas.

depends on which year 450R carb you get too. the '04-'05s had a 42mm CV type carb, the '06 and up have a 39mm flat slide FCR carb.

the 400ex carb barley fits in the frame, there is no way the CV style carb would work without modding the frame i would think.

this is right from hondas website; specs about the 400ex:
ENGINE


Engine Type 397cc RFVC air-cooled dry-sump single-cylinder four-stroke

Bore and Stroke 85.0mm x 70.0mm

Carburetion 38mm piston-valve with accelerator pump

Ignition CD with electronic advance

Starter Electric

[SWIGIN]

miss print....wait, whats a piston valve? what ever it is its 35.5mm http://www.pismoatvrentals.com/honda_400_ex.htm

it seems we are both right about the 400ex carbs acording to the 400ex guys on exriders....in 05 honda did change the carb but the body is the same size....they just measure it differently then the older carb....odd

in 05 and up honda used a non ajustable neddle

http://www.exriders.com/vbb/showthre...tock+carb+size

[The Goat]

okay, I can't believe I'm asking this question. How do you get the camshaft out? After unbolting the sprocket from the cam, and loosening the cam chain, the cam still cannot slide out like I imagine it should.

Is there some detail which I am missing?

Also, I'm looking for the plastic slide for a 400ex carb...does anyone have one?

[Dirtcrasher]

Just pop it out of the journals. The oil helps it stick to the journals but it should pop right up with a carefully positioned pry bar....

[The Goat]

that's the thing, the camshaft comes aloose, but I can't slide it out, it isn't stuck, by any means, both the sprocket and the camshaft can come aloose. but once loose, it can't slide out of the sprocket, part of the engine itself seems to be in the way. I must be doing something wrong.

I've only had time to look at it for a few minutes, I just want to have everything dismantled by tomorrow so I can bring it to be bored and ship off the cam and rocker arms.

[Dirtcrasher]

It can't slide out, it has to pop up or the lobes and the head casting gets in the way.

[The Goat]

so what you're saying is, the only way to get it out, is to pull the opposite end of the camshaft upward, essentially forcing it out?

I'm only asking for clarification because it simply seems like there would be a method that wouldn't put stress on anything.

[Dirtcrasher]

OK, the rocker cover is off and the sprocket is removed with the chain draped to the side - correct??

You should be starring at a cam with 2 lobes and a rubber plug on the opposite end from the sprocket. It does spin freely also - yes?? Then I'd say the it is just the sealant on the rubber plug thats preventing it from popping up or the resistance from the oil between the cam journal and head bearing surface.

Make sense??

[The Goat]

i can free the sprocket from the chain, but i can't remove it from that small area....

obviously if the sprocket wasn't there, i could remove the shaft quite easily.

[Dirtcrasher]

Did you pull off the timing chain tensioner? That sprocket should just pop off also...
Now I'm confused....... LOL!!

[The Goat]

okay i think i know what i'm doing wrong. on the 200x you simply take the bolt out, that allows the chain to be slack enough to handle everything. i just stupidly assumed that it would work the same way.

yeah, I'll take the tensioner off and all should be well.