shims .. how often?

smek · Post by **smek** » Mon Aug 07, 2006 8:40 pm

Are they every major service (12000k's) or less frequent than that ?

was given two quotes from in line motorcycles. $350 for a major without em. $500 - $600 for a major with em.

I assumed they were done by brighton kwaka at 36000, but not so sure now. Docket just says as per manual (which I don't have)

javaman · Post by **javaman** » Mon Aug 07, 2006 8:42 pm

Here you go : http://www.themcdonalds.net/richard/bik ... lves.shtml

Strika · Post by **Strika** » Mon Aug 07, 2006 8:43 pm

I think shims are every 24,000 klms !!! how many has yours done????

greeny · Post by **greeny** » Mon Aug 07, 2006 8:49 pm

Not sure how often they are replaced but,

I hear Nekas loves SHIM's

smek · Post by **smek** » Mon Aug 07, 2006 8:54 pm

Strika wrote:I think shims are every 24,000 klms !!! how many has yours done????

55ish ...

Smitty · Post by **Smitty** » Mon Aug 07, 2006 9:22 pm

smek wrote:
Strika wrote:I think shims are every 24,000 klms !!! how many has yours done????
55ish ...

nikos

isn't there a copy of the service manual for the 6 in the KSRC library?
maybe check it out and see what it sez...

from memory its every 12000km (7500miles)

hth

smek · Post by **smek** » Mon Aug 07, 2006 9:55 pm

There is, but it's the J model (mine's a G) and I'm on dialup so haven't bothered to download it even though lots of bits will be the same.

Might get it at work tomorrow though and have a look at the service table.
Also planning on ringing brighton kwaka and race replica and see what prices they give me. Last major at brighton kwaka was $500 ish. Ken doesn't own brighton anymore does he ?

I should just drop into maty10's service center but cos it's a bit overdue I'd like to get it professionally done.

mike-s · Post by **mike-s** » Mon Aug 07, 2006 11:18 pm

neka likes a good shim job now and then.

Strika · Post by **Strika** » Tue Aug 08, 2006 8:15 am

Smitty wrote:
smek wrote:
Strika wrote:I think shims are every 24,000 klms !!! how many has yours done????
55ish ...
nikos

isn't there a copy of the service manual for the 6 in the KSRC library?
maybe check it out and see what it sez...

from memory its every 12000km (7500miles)

hth

Pretty sure a minor is 6K, a major is 12K and the valves are checked and adjusted if neccesary at 24K-48K-72K etc etc.,

So theoretically, if they had done the 48K service properly at Brighton, then you should be fine.

javaman · Post by **javaman** » Tue Aug 08, 2006 8:46 am

What if they're not changed? I mean it's not a desmo valve and the spring will take care of whatever wear there is ? Of course not ideal .. but It would not cause any damage would it ?

I miss those bikes with screw-type valve... even my car I can do quite easily (non-shim)...

Buck · Post by **Buck** » Tue Aug 08, 2006 2:27 pm

javaman wrote:What if they're not changed? I mean it's not a desmo valve and the spring will take care of whatever wear there is ? Of course not ideal .. but It would not cause any damage would it ?

I miss those bikes with screw-type valve... even my car I can do quite easily (non-shim)...

buy my guzzi Andi, push rod vtwin 650.
Adjust the valves with a shovel. its red too
ill even fit a nancy waterbottle holder on it and get
italian interface for the GPS.

Steve

Strika · Post by **Strika** » Tue Aug 08, 2006 2:53 pm

javaman wrote:What if they're not changed? I mean it's not a desmo valve and the spring will take care of whatever wear there is ? Of course not ideal .. but It would not cause any damage would it ?

I miss those bikes with screw-type valve... even my car I can do quite easily (non-shim)...

As the motor wears, the valves can receed into the vavle seats, as well as stretch. When this happens it closes the clearance between the cam and the valve bucket. Once it gets to a point where it has no clearance the valve will start to leak and burn out. So check your clearances. More regularly if you ride them hard.

javaman · Post by **javaman** » Tue Aug 08, 2006 3:55 pm

Strika wrote:
javaman wrote:What if they're not changed? I mean it's not a desmo valve and the spring will take care of whatever wear there is ? Of course not ideal .. but It would not cause any damage would it ?

I miss those bikes with screw-type valve... even my car I can do quite easily (non-shim)...
As the motor wears, the valves can receed into the vavle seats, as well as stretch. When this happens it closes the clearance between the cam and the valve bucket. Once it gets to a point where it has no clearance the valve will start to leak and burn out. So check your clearances. More regularly if you ride them hard.

I thought it's more like this: The shims wear out, which means the cam closes/opens later, which means the valve will still close tight (pushed by the springs). Your description is as if the shims actually becomes thicker??

Please let me know where my logic goes wrong ? (Because I haven't done them for soo long...) ?

Strika · Post by **Strika** » Tue Aug 08, 2006 4:23 pm

javaman wrote:
Strika wrote:
javaman wrote:What if they're not changed? I mean it's not a desmo valve and the spring will take care of whatever wear there is ? Of course not ideal .. but It would not cause any damage would it ?

I miss those bikes with screw-type valve... even my car I can do quite easily (non-shim)...
As the motor wears, the valves can receed into the vavle seats, as well as stretch. When this happens it closes the clearance between the cam and the valve bucket. Once it gets to a point where it has no clearance the valve will start to leak and burn out. So check your clearances. More regularly if you ride them hard.
I thought it's more like this: The shims wear out, which means the cam closes/opens later, which means the valve will still close tight (pushed by the springs). Your description is as if the shims actually becomes thicker??

Please let me know where my logic goes wrong ? (Because I haven't done them for soo long...) ?

Round the wrong way Andi. The shims don't really wear, it's the valve stretching and receeding into the head which closes the clearances. Hope that clears things up?

javaman · Post by **javaman** » Tue Aug 08, 2006 5:06 pm

That makes sense!! The valves constantly being pulled by the springs and the valve seat wears out ...

FARRRK

better pull my finger out (and hopefully one bad weekend weather) then...