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**Deathwing** · 05-31-2018, 01:17 PM

Re: Honda CBR 250R

Guys can anyone confirm this? Heard this from Honda service head that engine needs to be checked every 25000kms for valve clearance, head gasket, etc, basically opening the engine??i was a bit flabbergasted, I know svcs have a habit of asking you to do stuff eventho it maybe a smaller problem, seems like combustion issue, but nothing serious with the bike, I'm just a bit concerned , been told it could be due to old fuel as well.

**leech** · 05-31-2018, 01:36 PM

Re: Honda CBR 250R

Originally posted by Deathwing View Post

Guys can anyone confirm this? Heard this from Honda service head that engine needs to be checked every 25000kms for valve clearance, head gasket, etc, basically opening the engine??i was a bit flabbergasted, I know svcs have a habit of asking you to do stuff eventho it maybe a smaller problem, seems like combustion issue, but nothing serious with the bike, I'm just a bit concerned , been told it could be due to old fuel as well.

And what exactly is wrong with your bike, buddy? Few posts back, you were talking about modding, anything related to that?

**Deathwing** · 05-31-2018, 01:48 PM

Re: Honda CBR 250R

Originally posted by leech View Post

And what exactly is wrong with your bike, buddy? Few posts back, you were talking about modding, anything related to that?

Bike is dead stock, I just planned to if I converted my bike into a track only bike, but it's something with compression, something feels a bit off, I went to the SVC and the head service guy says there might be a valve issue but I don't personally feel like there is any power loss or anything, I am due for a clutch set replacement due to clue bell noise which I've heard can be reconditioned on the cbr 150 but not on the 250, it's just a feeling of low compression, could this be due to old fuel?

**leech** · 05-31-2018, 01:54 PM

Re: Honda CBR 250R

Originally posted by Deathwing View Post

Bike is dead stock, I just planned to if I converted my bike into a track only bike, but it's something with compression, something feels a bit off, I went to the SVC and the head service guy says there might be a valve issue but I don't personally feel like there is any power loss or anything, I am due for a clutch set replacement due to clue bell noise which I've heard can be reconditioned on the cbr 150 but not on the 250, it's just a feeling of low compression, could this be due to old fuel?

You feel something is off, but no power loss. Then what could it be? Can you drain the fuel and fill in fresh? Just to tick that off the list.

**Deathwing** · 05-31-2018, 02:12 PM

Re: Honda CBR 250R

Originally posted by leech View Post

You feel something is off, but no power loss. Then what could it be? Can you drain the fuel and fill in fresh? Just to tick that off the list.

Thanks for the input, you know what, old fuel was the culprit, bike feels much better now, put a few litres of 97 and immediately can feel the difference, I think majority of the fuel stations are a bit dicey on the quality of fuel but hell that's India for you [emoji19]

**arvstreetracer** · 05-31-2018, 04:46 PM

Re: Honda CBR 250R

Originally posted by Deathwing View Post

Guys any idea what engine knocking is related to, my friend who rode my bike says its the problem with my bike and could be due to old fuel.

Knocking is a noise you hear from cylinder due to preignition of fuel+air before piston reaches the TDC. There are several reasons for knocking including lean AFR, carbon deposits over piston and its surroundings, squish area, advanced ignition timings. High compression and low octane fuel also increase knocking. To understand it, it is like ignition of compressed charge (fuel and air) before spark plug could actually ignite it.

Carbon deposits over piston or in squish area work like hot spots and are hotter in comparison to the other areas where there are no deposits. Consequently, it helps creating preignition of fuel. Apart from that if deposits are more, it also increases compression a bit and a regular fuel like we get in India (RON 87) can be preignited. A high octane fuel can subside the issue temporarily, but would not cure it.

Knocking is also known as spark knock, spark pinging etc. If severe, the impacts are catastrophic. It can blow the piston crown, can bend down connecting rod, or break the main bearing as well.

Hope this helps.

**s1d** · 05-31-2018, 05:06 PM

Re: Honda CBR 250R

Originally posted by psr View Post

Please do not recommend Race Concepts as many times over they have been shown to be un-dependable and the owner himself had admitted the shortcomings of the concept.

hmm.. i usually don't , but some people just want to maaadify their bike .. just for their sake

i am a believer that stock is better in our country.
you mean to say raceconcepts itself admits their kits do not work out properly ?

----consecutive posts auto-merged-----

Originally posted by Deathwing View Post

Guys can anyone confirm this? Heard this from Honda service head that engine needs to be checked every 25000kms for valve clearance, head gasket, etc, basically opening the engine??i was a bit flabbergasted, I know svcs have a habit of asking you to do stuff eventho it maybe a smaller problem, seems like combustion issue, but nothing serious with the bike, I'm just a bit concerned , been told it could be due to old fuel as well.

Checking valve clearance is usually recommended and that doesn't require the 'engine' to be opened up.. just the valve cover on top. Usually around 25k km might be a good time to check the clearances. But again some svc mechanics aren't knowledgeable about dealing with the clearances/shims etc.. and i feel that if there isn't a issue per se (like cold start issues, performance, valve noise) it's better to leave than mess around with them.
if you know how to check and calculate the clearances/shims go ahead and get it done under your supervision.

apart from that i don't think you need to open anything else on the engine front.

**yathi** · 06-01-2018, 01:49 AM

Re: Honda CBR 250R

Dear members, I was searching this for a while but didn't get an answer so far. Can we retrofit any rear tire hugger on Cbr 250. I am more interested on the one seeing on Duke series. It will give a piece of mind on this raining season.

**D.j** · 06-01-2018, 03:35 AM

Re: Honda CBR 250R

Originally posted by yathi View Post

Dear members, I was searching this for a while but didn't get an answer so far. Can we retrofit any rear tire hugger on Cbr 250. I am more interested on the one seeing on Duke series. It will give a piece of mind on this raining season.

You can try Aliexpress for this venture .

Motorcycle fender backing cover very cool modified wheel size 12-17inch

500 Internal Server Error

http://s.aliexpress.com/u6ve226v?

This is universal tyre hugger , I am also inclined to do so .. will try this one out later .

**psr** · 06-01-2018, 10:02 AM

Re: Honda CBR 250R

Originally posted by s1d View Post

hmm.. i usually don't , but some people just want to maaadify their bike .. just for their sake

i am a believer that stock is better in our country.
you mean to say raceconcepts itself admits their kits do not work out properly ?

I am sure you would have read Shv18's old thread in General biking on his mods and what he faced with his Yam FZ....if not please do take the time to read it fully to understand how the initial experience upto a few Kms is acceptable then everything in the engine goes from bad to worse withe mods from Race Concepts...The POWERHOUSE Fz18

----consecutive posts auto-merged-----

Originally posted by nuda900r View Post

psr sir,

I got hold of the CBR250R and CBR300R parts catalogues. In my opinion, the following items have to be changed to covert a cbr 250 to a cbr 300

1.Crank shaft -part no 13000-K33-D03
2.New cylinder -part no 12100-K33-D00
3.New piston - part no 13101-K33-D00
4.Clutch springs - part no 22401-K33-D01
5.ECU - part no 38770-K33-D02
6.Cam shaft in - part no 14110-K33-D00
7.Cam shaft ex - part no 14210-K33-D00

The ECU can be avoided if you can get your old ecu tuned for the higher displacement

That's the total list of parts for converting a CBR250 engine to a CBR300 engine

The approximate total cost for the parts for this conversion is about Rs 33000 if the parts are brought in Thailand of which the ecu is about 9k

psr sir, you are right that this is not really cost effective. I was just considering this as a theoretical exercise

Cheers

In theory it is ok...the cost of correct conversion will be upto US$1,000..which is simply not worthwhile, since the improvement of cost Vs improvement is not appreciable.
Here are two links for your read...

Engine rebuild and conversion service - Honda CBR250R Forum : Honda CBR 250 Forums

Converting engine to 286cc - Honda CBR250R Forum : Honda CBR 250 Forums

**yathi** · 06-02-2018, 02:04 PM

Re: Honda CBR 250R

Originally posted by D.j View Post

You can try Aliexpress for this venture .

Motorcycle fender backing cover very cool modified wheel size 12-17inch

500 Internal Server Error

http://s.aliexpress.com/u6ve226v?

This is universal tyre hugger , I am also inclined to do so .. will try this one out later .

Thanks mate, I orderd the same from Ali express. Luckily, I got a chance to see similar fittings on a Cbr 650 here n Bangalore HSR. I also like to add few more items, I can see many discussions happened about the same but if you can guide me quickly then that will be great.

1) indicator integrated mirror- I was able to see quite a few option here n amazon as well but I don't want to compromise the rear view visibility. I selected this one from Ali express, pls advise me.

1 Pair Motorcycle Turn Signals Rear View Side Mirrors For Honda CBR 600 RR 2003-2014 CBR1000RR 2004 2005 2006 2007 CBR 250R 500R

500 Internal Server Error

http://s.aliexpress.com/rAjA7ZJZ?fromSns=WhatsApp

2) A better headlight bulb with same specification which won't harm the current headlight illumination and fibre glass. Something like osram or Philips but not led ( don't want to remove rubber covering). Just for better visibility and some white light.

3) led pilot light which I saw in Amazon as below

https://www.amazon.in/dp/B071VV762F/ref=cm_sw_r_wa_apa_i_yEKeBbNE2HNAS

4) A decent radiator guard

For Honda CBR 250R CBR250R 2010 2011 2012 Motorcycle Accessories Radiator Grille Guard Cover Protector

500 Internal Server Error

http://s.aliexpress.com/neMvuy2E?fromSns=WhatsApp

Thanks

**Deathwing** · 06-02-2018, 03:58 PM

Re: Honda CBR 250R

Originally posted by yathi View Post

Thanks mate, I orderd the same from Ali express. Luckily, I got a chance to see similar fittings on a Cbr 650 here n Bangalore HSR. I also like to add few more items, I can see many discussions happened about the same but if you can guide me quickly then that will be great.

1) indicator integrated mirror- I was able to see quite a few option here n amazon as well but I don't want to compromise the rear view visibility. I selected this one from Ali express, pls advise me.

1 Pair Motorcycle Turn Signals Rear View Side Mirrors For Honda CBR 600 RR 2003-2014 CBR1000RR 2004 2005 2006 2007 CBR 250R 500R

500 Internal Server Error

http://s.aliexpress.com/rAjA7ZJZ?fromSns=WhatsApp

2) A better headlight bulb with same specification which won't harm the current headlight illumination and fibre glass. Something like osram or Philips but not led ( don't want to remove rubber covering). Just for better visibility and some white light.

3) led pilot light which I saw in Amazon as below

https://www.amazon.in/dp/B071VV762F/ref=cm_sw_r_wa_apa_i_yEKeBbNE2HNAS

4) A decent radiator guard

For Honda CBR 250R CBR250R 2010 2011 2012 Motorcycle Accessories Radiator Grille Guard Cover Protector

500 Internal Server Error

http://s.aliexpress.com/neMvuy2E?fromSns=WhatsApp

Thanks

Is the led pilot bulb for the parking lights?

**Deathwing** · 06-02-2018, 04:01 PM

Re: Honda CBR 250R

Originally posted by arvstreetracer View Post

Knocking is a noise you hear from cylinder due to preignition of fuel+air before piston reaches the TDC. There are several reasons for knocking including lean AFR, carbon deposits over piston and its surroundings, squish area, advanced ignition timings. High compression and low octane fuel also increase knocking. To understand it, it is like ignition of compressed charge (fuel and air) before spark plug could actually ignite it.

Carbon deposits over piston or in squish area work like hot spots and are hotter in comparison to the other areas where there are no deposits. Consequently, it helps creating preignition of fuel. Apart from that if deposits are more, it also increases compression a bit and a regular fuel like we get in India (RON 87) can be preignited. A high octane fuel can subside the issue temporarily, but would not cure it.

Knocking is also known as spark knock, spark pinging etc. If severe, the impacts are catastrophic. It can blow the piston crown, can bend down connecting rod, or break the main bearing as well.

Hope this helps.

Any idea what causes this?

**B7ACKTHORN** · 06-02-2018, 05:42 PM

Re: Honda CBR 250R

Originally posted by Deathwing View Post

Any idea what causes this?

Arvind, explained it like he'd to a child, why. Please read it twice and Google for some more information.

Cheers!
VJ

**Deathwing** · 06-02-2018, 08:50 PM

Re: Honda CBR 250R

Originally posted by B7ACKTHORN View Post

Arvind, explained it like he'd to a child, why. Please read it twice and Google for some more information.

Cheers!
VJ

It was old fuel, my engine is fine, as I stated earlier not all bunks are trustworthy with the quality of fuel.

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