Top overhaul

[s4vtec]

bros of CB400, i need some advices on top overhaul as i am sending my bike into workshop for repairs soon...

can advice me on what are the parts that are normally replaced? what are the checks that needs to be done? how would i know if the parts really needs to be replaced? timing chain? chain tensioner? valve clearance? carbon build up? clutch plate and clutch springs? i'm a dumber into all this and needs you guys explainations and advices? can any one help? thanks in advance!

[duckit]

How Much you willing or intend to pay for all these ... ?

[boon21]

What makes you think that your bike or 'you' need to go for top overhaul & if it's top overhaul then what to do with the clutch plate & clutch spring (is it on top?).

[episode2]

a certain feelings of clutch slip or so on..ask the mech to check.. for top overhaul i am not too sure how many wear and tear they will find inside of ur top.They will sure clean ur valves and granba off those carbon tars built up on top of ur pistons.Tension/Timming chain/Rings and more, they will see from there weather it need to be replace or not and whatever it is a need.

 

So at the same time carb svc..since already taken out for ur top svc.Tune up properly and be back on road.

[s4vtec]

Originally posted by boon21@Nov 2 2006, 11:38 PM

What makes you think that your bike or 'you' need to go for top overhaul & if it's top overhaul then what to do with the clutch plate & clutch spring (is it on top?).

i know that clutch plate & clutch spring are not at the top... but i also need advice on them mah...

[s4vtec]

Originally posted by episode2@Nov 3 2006, 02:17 AM

a certain feelings of clutch slip or so on..ask the mech to check.. for top overhaul i am not too sure how many wear and tear they will find inside of ur top.They will sure clean ur valves and granba off those carbon tars built up on top of ur pistons.Tension/Timming chain/Rings and more, they will see from there weather it need to be replace or not and whatever it is a need.

 

So at the same time carb svc..since already taken out for ur top svc.Tune up properly and be back on road.

ok, i'll take note of that...

thanks.

[h_LoNg]

Originally posted by boon21@Nov 2 2006, 11:38 PM

What makes you think that your bike or 'you' need to go for top overhaul & if it's top overhaul then what to do with the clutch plate & clutch spring (is it on top?).

He gear 1 oready open Vtec

Wat do u tink

[s4vtec]

Originally posted by @h_LoNg@Nov 3 2006, 09:56 AM

He gear 1 oready open Vtec

Wat do u tink

giddy

[boon21]

Oops Thomas,

my post mean nothing as just to joke! By the way if you want to do 'Top Overhaul' only, I think you can save it loh! 4-stroke big bikes 'Top' is nothing to service but most pples goes for 'Block Overhaul' & that's the 'correct medicine' to your bike problem! 'Top Overhaul' normally is becos of shin,tensioner,bluff, spring & top gasket leak (W&T),nothing much. But 'Block Overhaul' will be different & you can feel the power.

[episode2]

Originally posted by boon21@Nov 3 2006, 11:37 PM

Oops Thomas,

my post mean nothing as just to joke! By the way if you want to do 'Top Overhaul' only, I think you can save it loh! 4-stroke big bikes 'Top' is nothing to service but most pples goes for 'Block Overhaul' & that's the 'correct medicine' to your bike problem! 'Top Overhaul' normally is becos of shin,tensioner,bluff, spring & top gasket leak (W&T),nothing much. But 'Block Overhaul' will be different & you can feel the power.

porting sibo.... 4x 12.5 or 4x 25 ??

[s4vtec]

Oops Thomas,

my post mean nothing as just to joke! By the way if you want to do 'Top Overhaul' only, I think you can save it loh! 4-stroke big bikes 'Top' is nothing to service but most pples goes for 'Block Overhaul' & that's the 'correct medicine' to your bike problem! 'Top Overhaul' normally is becos of shin,tensioner,bluff, spring & top gasket leak (W&T),nothing much. But 'Block Overhaul' will be different & you can feel the power.

 

wat about 100,000km servicing... wat needs to be done???

[syarif]

bro, u dig out last year thread. heh.

[s4vtec]

bro, u dig out last year thread. heh.

 

hehe, jus noticed. its really one year ago... see the date of episode2 post...

 

cos i need the info...

[kucari]

yeah...mine oso reach 100k oredi..what needs to be done?

[JbAtRaCeR]

Top overhaul consist on how bad the condition is,mostly for a bad engine.

 

1.Timing chain

2." " tensioner

3.Valve spring(weak springs dont close the valve tightly)

4.Valve guide(Worn out guide causes freeplay and also allows oil to be sucked into the combustion chamber)

5.Valve face(make sure no cracks)

6.valve stem seal(to prevent oil from getting sucked into the combustion chamber)

7. Cylinder head(No warpage so that the cylinder head can seal better onto the block)

8. Camshaft - bearing clearance

 

 

I think thats all for the top..

 

Not all this things must be change,the technician have a method of checking these stuff.Normally what i have learn only timing belt must be change at 100 000km but ours is using chain.Therefor can last twice longer.Valve clearance is a must.

 

Other than porting the block for increase horsepower,milling the cylider head face will just by a per 0.005mm will make the engine have a higher compression ratio thus move hp. But thats a very troublesome way,you will need to make sure that there's enough clearance when the valve opens and does not hit the face of the piston....

[s4vtec]

Top overhaul consist on how bad the condition is,mostly for a bad engine.

 

1.Timing chain

2." " tensioner

3.Valve spring(weak springs dont close the valve tightly)

4.Valve guide(Worn out guide causes freeplay and also allows oil to be sucked into the combustion chamber)

5.Valve face(make sure no cracks)

6.valve stem seal(to prevent oil from getting sucked into the combustion chamber)

7. Cylinder head(No warpage so that the cylinder head can seal better onto the block)

8. Camshaft - bearing clearance

 

 

I think thats all for the top..

 

Not all this things must be change,the technician have a method of checking these stuff.Normally what i have learn only timing belt must be change at 100 000km but ours is using chain.Therefor can last twice longer.Valve clearance is a must.

 

Other than porting the block for increase horsepower,milling the cylider head face will just by a per 0.005mm will make the engine have a higher compression ratio thus move hp. But thats a very troublesome way,you will need to make sure that there's enough clearance when the valve opens and does not hit the face of the piston....

 

thanks for the advices...

[JbAtRaCeR]

thanks for the advices...

 

 

No problem bro...Me also new to S4,i know what needs to be changed but not sure how much the total price...

[ops-fd]

best shop for top over-haul??

[JbAtRaCeR]

best shop for top over-haul??

 

Boon Siew?....heheh!!...

[ops-fd]

Boon Siew?....heheh!!...

 

how much will the be ??/

[JbAtRaCeR]

Not sure coz lots of stuff must be changed if u have a very high mileage bike..Can check at the price thread...

[ops-fd]

Not sure coz lots of stuff must be changed if u have a very high mileage bike..Can check at the price thread...

 

where the thread bro??

[kucari]

i think he was referring 2 s4 price components list

[JbAtRaCeR]

Sorry...forget to mention at the components list thread...

[vtec power]

pai sae to dig up an old thread. Couldn't find ani other related thread about valve clearance le.

 

I would lk 2 noe which shop is recommendated for doing valve clearance & hw much it cost? Hw long does the whole process takes?

 

I consider valve clearance as quite a major servicing therefore would realli survey well b4 senting to a particular shop to get it done.

 

Have ani1 sent their bike to doctor ali beside yeow motor at AMK industrial park to do valve clearance? Gd or not?