ascott 500 head swap onto a 350x.... with pics

[SWIGIN]

i have a 460cc 350x update but not my motor.

my friend got his big bore stroker running today, now his is built the same as mine right down to the cam and carb except he's running a 350x head and not the ascott head and let me tell you THAT MOTOR IS FUN

i realy cant wait to get mine running now! his is so smooth and strong yet so rideable its sick.

it feels like a worked up 450 but it has tons and tons of torque.......as soon as my track dries out i'll let you know how it does against the 450s

[Dirtcrasher]

Not a doubt in my mind..... It's gonna be completely NASTY!!

We'll all want some video

That was quite a bit of work and number crunching to get that Scott bolted on. You won't see many guys do that...

[atczack]

Can't wait to see the ride report or some video! It just so happen's I am swapping out my worn 350x cylinder for a new one this weekend, maybe I'll ship my old one to you and you can fix me up like your's! lol Good luck man.

[SWIGIN]

well i got a ride report......the 350x clutch wont hold with this much power

my buddy is on his 3rd clutch (in a month).......stock fibers with barnett springs, barnett clutch with new barnett springs, he even tried a ebc or vesrha kit.

the barnett fibers with new factory steels and new barnett springs held up the longest.....like a hour tops.

im screwed with my 460cc with a ascot head untill we can get his clutch to hold i have no hope for mine (im bigger then him and my bike is heavier)

we are trying to find what it will take to get a ascot ft500 clutch (witch has a extra steel and fiber disc) in a 350x motor but if anyone has one or even a early xr500 clutch complete id be interested in it to fool around with and see if we can get these monster motors to hook.

now with that all said it still (with a sliping clutch) eats all my buddys race preped and modded 450 quads....lol

[Louis Mielke]

NICE! Post some complete pics with the engine in the frame all buttoned up ready to ride.

[SWIGIN]

its not my motor thats done...its my buddys 250x/350x quad....i posted pics of it before...it looks no different since he runs a 350x head.

[SWIGIN]

since i typed my last post my buddy called me and said he just got done doing some machine work to a 350x basket and inner hub and he got it to take a extra steel and fiber disc....just like the ascot 500/ xr500 motors have.

so we will see if this holds up

[Tecate performance]

good info on the ascott clutch, and pics please when its done

you may want to try clutch springs from FST, the 'green' ones. i've used them in my 450 350x and 380 300ex motors and they hold great, although those have stock stroke cranks. i always have best luck with oem plates.

also, what cam did you guys end up using?

[SWIGIN]

if his holds up then ill machine a old clutch for mine and get pics

as far as cam hes using a megacycle xr500 #144-20

im ether going with that cam or the next one up #144-21

but ill probaly go with the smaller one since i dont want this thing to make tons of power way up high. his runs real strong down low thru the mid range with the 144-20

[SWIGIN]

i just got off the phone with my buddy and he said it didnt hold ether so we are both dead in the water.

i know back in the day guys like TC and sparks had 475.. and bigger 350x motors but i cant beleive this combo over powers the clutch like it does.

back to the drawing board

[Billy Golightly]

Ya need to mod a lockup style pressure plate from a 450 or 250r or something.

[200x Basket]

i came across this tonight. he may have some info for you


http://forums.atvconnection.com/mess...did/264172.cfm

[SWIGIN]

Ya need to mod a lockup style pressure plate from a 450 or 250r or something.

iv heard people talk about a lockup clutch....what is it?

and i thought a 250r had a old normal clutch......if the R has or can use a lockup deal then i should be able to as well since the disc's are the same diameter.

any info on this setup would be GREATLY needed and apreciated

[SWIGIN]

ok...i searched lockup clutch and i seen what they look like ....kinda the same idea as a centerforce clutch for a car.

but the problem is the 250r and the 450r are push rod clutchs witch works totaly different then a 350x....any ideas?

and if you look at a xr500 ft500 or a 450r clutch on bike bandit they all run a judder spring....what is that?

the 350x dont run this spring.... i think im going to try to get my hands on a ft500 clutch since those roundy round guys can get 80hp out of a ascot motor (from what iv seen on thumper talk) and i guess they dont have clutch problems.

[Billy Golightly]

http://gigotracing.com/index.php?opt...id=13&Itemid=1

Have a look at these too, or give him a call. They are not the "normal" lockup style and are a lot more contained/smaller. It works off of metal balls, like out of ball bearings. They sit in the middle and when you dump the clutch they all sling out to the outside of it and apply the more pressure to the clutch plates.