02 470 tear down questions

dougn1 · Feb 20, 2015

my FX470 is partially apart (about 200 hrs) and it seems the cam chain doesn't have a master link. am i correct? i'm planning to freshen everything up and install an updated two bearing balancer and updated rockers. also i am going to install the dual valve spring set-up. what else should i update?

i like the way it runs so i'm hesitant to change the cam but .....

dougn1 · Feb 20, 2015

valve springs are stuck in the head....

Kayeffess · Feb 20, 2015

They will pull out. I'm going to watch this thread. Feel free to post pics. I'm waiting on a 470 engine to arrive that I'm hoping to redo in to a 400 for trail use.

dougn1 · Feb 20, 2015

thanks. this will drag out a while because im gone every other month

Kayeffess · Feb 20, 2015

Yes, you will have to cut/break the chain. You might want to go over the owners docs ( in my signature). There are a few things like cam sprocket, cam chain tensioner blade, decomp that you might want to look after while you have it apart. Perhaps check valves for tuliping.
My build is also going to be a slow one. I plan on removing the balancer as well.

dougn1 · Feb 20, 2015

thanks i went ahead and broke the chain. the valves seem to be ok. they have been seating nice and evenly. they have a nice shiny surface. in fact i can see no damage anywhere. cam lobes etc....

what is the spring loaded thing that is fitted to the outside of the cam sprocket?

brucifer · Feb 20, 2015

dougn1 said:
thanks i went ahead and broke the chain. the valves seem to be ok. they have been seating nice and evenly. they have a nice shiny surface. in fact i can see no damage anywhere. cam lobes etc....

what is the spring loaded thing that is fitted to the outside of the cam sprocket?

That's the auto-decompression device.

dougn1 · Feb 20, 2015

thanks.....i see that. it's a centrificle ....for the electric start. so there's two decompression devices....

the last one i had apart was only kick start

now i'm trying to get those end caps out so i can remove the rockers

Taffy · Feb 21, 2015

there are three decompressors on yours.
kickstart from the back of the engine
manual from the bars
and, automatic on the cam

i 100% doubt the inlet valves are good but there you are..... a first ever!

you don't have to change the cam? who said that to you? you have the 53 cam, a torqey tractor cam that is very harsh on the valve gear. DVSK vastly improves this.

the 470 is just too much bike off the road and so some fit the milder '01' cam from the 400s. or if you want smoother power and the valve gear to be super safe then you go for the '08' cam which is an all purpose cam with more top end and worth revving.

if on the road then the '08' cam is far better. if on the road, remove the close ratio 6th, sell, make money and buy standard 'wider' 6th.

these bikes do NOT NOT like the road!!!!

regards

Taffy

dougn1 · Feb 21, 2015

well the valves seem to be ok on visual but i don't know. the shiny ring where they seat looks good. also they never tightened up and leaked. how else can i tell?

glad i don't have to change the cam. i like the way it runs. i rarely rev it up to higher rpms

why don't they like the road? just rpm related?

ok i was reading some later 02's had dual row bearings in the balancer. is there any way to tell without splitting the cases?

also would the single row be ok in the 470?

i really dont want to split the cases.....

Taffy · Feb 21, 2015

the single row is absolutely fine, you can't tell what they are from outside. the 53 cam has no top end for road work it is a short shifting cam.

the valve face must be a nice flat 45d angle and 2.5-3mm wide piece of quality steel. it mustn't have ANY curve in it at all.

Taffy

dougn1 · Feb 21, 2015

the roller on my updated rockers is a little wider and the pin looks like it sits in a bushing. the old pin looks solid or one piece. can anyone tell me what updated version i have? i think they're 03 rockers....are these ok?

also i can't how or where oil is supposed to get into the rocker shaft.... even though there are holes in the housing that are aligned with holes in the shaft....

bushmechanic · Feb 21, 2015

in mine the oil comes up through an oil passage in the headgasket near the rear of the cam chain tunnel then into the rocker cover then into the rocker arms

you'd need to press the rollers out of the assembly to be sure on the size and measure the pin diameter since some 02s and 03s have the newer size follower bearings but the "bushing" is likely just where the pin has been deformed by peening to hold it in.

if you are considering dual valve springs there is a vast price range, KTM duals are the best value, kibblewhites are the best springs

http://husaberg.org/mechanical/10680-all-about-valve-springs-nice-pics.html

dougn1 · Feb 21, 2015

ok well that all makes way more sense. i also read something about 1/3 less force at full lift....didn't make sense. i'm thinking about all this stuff and the best way to go regarding cams etc. looks like the springs will help some.

i'm also debating on whether to change the cam to some other version than my 53. i wonder what the max lift of this cam is?

Taffy · Feb 22, 2015

dougn1 said:
i'm also debating on whether to change the cam to some other version than my 53. i wonder what the max lift of this cam is?

and if we told you, what woukld that mean to you?

and what would your next question be? let me have a guess?

it would be "well that's all well and fine and these are all numbers and they don't really mean anything to me. what I want to know is: how do the cams perform?"

am I right?

you've had the answer fella.......

regards

Taffy

dougn1 · Feb 22, 2015

it would tell me about max force delivered by the valve spring

bushmechanic · Feb 22, 2015

I don't have specs on the 53 but you can very roughly assume similar to the 55 so 1-2mm less lift than a "08" cam

the 08 cam actually lifts the valve 10.6mm both intake and exhaust

dougn1 · Feb 22, 2015

i realized maybe it's not the amount of lift thats a problem but probably the initial acceleration/ramp of the 53 cam. anyway i'm pretty sure i'm going to install an 08 cam if i can find one

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