Re: Honda CBR 250R

I also face random issues so i will definitely give your method a shot and see how things pan out. I do not have a honda but an NS, though i am guessing the method wont know which bike is it being used on. Will keep this posted bro.

Re: Honda CBR 250R

Guys I have faced this situation where I leave my bikes handles while riding n it starts swaying towards the left... Is it maybe because my alignment is wrong or the handle bars bent or something?

Re: Honda CBR 250R

Can somebody explain me the reasons behind shims going kaput.

There is a very mild shim noise in my bike, it is not present when early morning starts but it comes when I have ridden for about 10-15kms or so near 4-5K rpm.

If this mild noise is calling for shim replacement then something is wrong somewhere as this is going to be my 3rd time for shim replacement.

the 1st time shim were replaced, they put up a wrong size shim in the inlet valves, hence I had to go for the 2nd change which was done around 14K kms and now I stand at 24K kms and mild noise of shims are creeping in.

This is so frustrating sometimes when on long rides, but can't help it.

Please help me with the reason in which the shims go kaput.

I have read [MENTION=32286]psr[/MENTION] sir's explanation on how shim works, I just want to know some reasons behind its failure so soon.

Few insights on my riding style :

1. always shifting at around 4-5K rpm never exceeded that
2. Gradual acceleration and de-acceleration
3. Sudden acceleration once or twice in 50 times maybe, but it is rarest of the rare affair.
4. Servicing is done at proper intervals and proper time and at proper km clocking.
5. Engine oil used Shell Ultra advance 10W 40
6. anything else missed out please let me know.

Cheers,
Sanjay

Re: Honda CBR 250R

Is the shim noise continuous, or comes and goes randomly?

Re: Honda CBR 250R

It stays once I have ridden for 10-15 kms and it goes away once the engine has cooled.

from my previous shim changes, I came to the conclusion that this time it is related to shim wear, but it is wearing so fast.

Cheers,
Sanjay

Re: Honda CBR 250R

I get that sound too, like small coins jingling, but totally at random. And it appears for a few seconds only.

My bike too is at 24k kms, but I've never changed shims. The SVC didn't even bother to check the valve clearances.

Re: Honda CBR 250R

Jingling noise I think happens when u change gears too fast, there was a phase in my riding of the bike when I used to rev hard and quickly shift up, that time I got this noise, try to gradually rev slowly thro the rev band up to 5000-6000rpm and shift, let each rev be revved for a longer and uniform manner, I maybe wrong, but I have heard this jingling part in the front part of my bike.

Re: Honda CBR 250R

Let me share my two cents worth. From what I've observed, the shim noise is easily identifiable, if you hear constant stitching noise, khat khat irrespective of the bike's running pattern, low rev, high rev, cold or hot, shims could be the problem. Now, this jingling has all possibilities, but the main possibility is the tensioner and the timing chain. You see, chains usually always have a whizzing noise to them, a loose timing chain sounds "chk, chk, chk" and this constant whizz can be in fact produce the infamous jingle.

Shims aren't meant to be ruled out either, only the rider knows what state his/her machine is. What I'd suggest is to do have a look into the chain tensioner/chain and proceed from there.

Cheers!
VJ

Re: Honda CBR 250R

I don't get any unusual ssound when the bike is cold. If there is a shim problem, there will always be stitching sound ?

Should I first change the chain tensioner and then move further. I won't mind paying 478 bucks and even if there is no problem with chain tensioner I can keep with me as a spare one. What say ?

Cheers,
Sanjay

Re: Honda CBR 250R


With a word of caution, I'd say yes, first observe if there is "prominent" stitching sound, if yes, try the shim way first, because that's cheap. But if you feel like jingling is what you feel most of the time, especially when you're sure, that it emanates from the engine compartment, check the tensioner/timing chain both of them, and keep us posted. But for now, I'd say this, check your shims, that's the cheapest way, if even after this you hear this jingling noise, provided the right shims were used and clearance between the shims were correctly adjusted, you can pretty much be sure it's the chain/tensioner either one of the both or both of them.

Cheers!
VJ

Re: Honda CBR 250R

What is shim??? Pls provide some knowledge

Re: Honda CBR 250R

No offense, but suggest you google, it's all out there and too much to type here!

Re: Honda CBR 250R

Check for the term "valve shim" in google.

Cheers,
Sanjay

Re: Honda CBR 250R

I am also having a similar problem. I think its not shim. What i hear, is a rapid "tarrrrr" sound whenever go beyond ~5k rpm. Its coming from the front. Based on what i observed, it depends only on the rpm. Also, it can be heard very easily because its loud and distinctive. Please help in finding the solution to it. Is this the rattle that a lot of people talk about?

Re: Honda CBR 250R

Just checked my bike - no sound at 10k, 7k, rpm. It seems to appear around 4k to 6k RPM. So in all probability, I don't have the shims issue.

Thanks to black thorn for the advice.