Re: Honda CBR 250R

Black smoke is normal, when revved extremely hard one can observe mild black smoke, which is perfectly normal. The reason I'd recommend you to do a compression check, is even though performance seems to be good now, the piston rings can over time give up or they're slowly starting to give up. A compression check would help you know if the rings are in check, and if the compression check values are fine, 188 PSI is manual recommended for the CBR. A compression check is all that you need so that it gives a health report of the engine, nice and clear.


DW thank you for the thread, IIRC a tapered roller bearing mod was done by another Bhpian too for the CBR. The one lousy part of the CBR would be the coneset. For some it lasts real well, for some it's a frequent pain point. Tapered roller bearing offer extremely smooth handlebar movement and last comparatively long than ball and cage setup. Grease the setup well, as even tapered bearings can develop play if not installed properly or slacked too much without grease.

Do mention the bearing number, brand and where you sourced it from. Would help a fellow Bhpian

Cheers!
VJ

Re: Honda CBR 250R

Hey vj, made in my uncle's factory in Chennai, we can make tapper rolled for all bikes essentially, soo it was free of cost for me, did have to source one part from outside. We make race spec bikes as well, right from fairing to aluminum swing arm to a number of things. But cost wise it would come upto 2-2.5k totally.

Re: Honda CBR 250R

Heyy guys, I own a 150R but I think it's the same part. I had been frequently experiencing inconsistent handling after I bank at a good speed, or maybe bump into a tiny pothole that stays for the rest of that ride. Give it a break and it sets back to normal. SVC has suggested me to change the bearings in the handle and it seemed fine. Then again, it started.

1. Do you think tyres will have to do anything with this? (24k km and still on stock)
2. Did anyone experience the same?

Re: Honda CBR 250R

I also experienced this. When i hit a big pothole . Both of my alloys got bent. After that i also felt that low speed handling become inconsistent. I thought this was because of the bend. But after consulting with the service center ,they adjusted the conset and everything came back to normal.

Re: Honda CBR 250R

There has been unusually high drop in oil level. In last 500km it drank close to 400ml oil.

and today morning I saw coolant leaking and kind of oil seepage nearby oil filter cover.

Re: Honda CBR 250R


The problem with front end is that one solution doesn't mean it's "the only solution" to all the other problem. Handlebar twitching can be caused by a worn tire, a shot wheel bearing, a crappy T stem adjustment or stem bearings. The key lies in finding what's the right prognosis. Though 24k is a good tire age, with a stock tire, excessive wear or cupped wear can make the slow speed steering twitchy meaning the you can feel the handlebar moving places left and right when taking left or right turns at slow speeds, which is caused by a worn tire. Handlebar oscillations, when you take off your hand off the bar above 60 kmph you can feel that the bike's handlebar oscillating left and right, again a worn tire to tight T stem to worn T stem bearings. And top this all off, excessively low tire pressure, the front end becomes totally worse in terms of feedback.

Post a photo of your tire, we can help perhaps.


From what I can see from the window, the oil seems to be full rather than being low, unless you've topped up the oil. Did you check the level on a perfectly flat surface with the bike being held upright? Secondly, yes you have a coolant leak. the leak seems, from the pics I infer from the coolant transfer pipe, that small black metal pipe that is attached to the lower part of the cylinder. Do post pics of the left side of the bike of the engine, near the thermostat so that we can know where exactly the leak is emanating from.



Cheers!
VJ

Re: Honda CBR 250R

Posting after a pretty long time.
Small update with the CBR.
Finally changed the tires from Michelin Pilot street radials(110 Front, 140 rear) to the Pirelli Diablo Rosso II(110 front, 150 rear).
Pretty darn happy with the mileage I got out of the Michelins, they lasted for a good 40,000kms. Nothing to add about the grip and performance, pretty easy to guess by the number of people using the michelins to know how good they are on the CBR. The front tire still had pretty good life left, but the rear had 3 fixed punctures and 2 unfixed punctures(small nails sitting flush), the unfixed punctures where the source of a slow leak, so finally just got around to changing it. The Michelins were on the stock size 110 in the front and 140 in the rear.
Now since I am not riding as much as before I decided to go for the Metz or Pirelli. The Pirelli set costed me around 11.8K in total. So far seems good, happy with the grip on the rubber, tried it out on both wet and wet, it's been good so far. Not expecting these to last more than 10-14k though.

So for the money you pay the best bang for the buck has to be the Michelins. It should last at least 3-4 times than the similar prices Pirellis and Metzelers.

Cheers
Ride Safe
Krishna

Re: Honda CBR 250R

That's totally what I suspected. I'll come back with the photos in a few days though.

Re: Honda CBR 250R

Oil was checked with bike held upright. Took the bike to ASC and got oil changed today. After 2.2k km of usage and topping up ~500ml in between there was hardly 800ml of oil left and it was pitch dark in colour.

I have contacted some of the ASCs here in Delhi for compression test as you suggested. But none of them is interested in doing it stating that there is obvious loss of oil so the test is not needed and the solution is to replace entire cylinder kit with valves which will cost around INR 20k including labour.

I discussed the issue with mechanic in Pragnya Honda and asked for any cost effective alternative. He said he runs mechanic shop outside where he can change piston rings, valves, shims and put a new oversized piston with cylinder boring done and that should be enough.

One more thing I would like to mention here is that since long I have been using Shell oil bought from Amazon. Today I switched to Honda throttle oil just to rule out any possibility of me using adulterated oil.


The coolant leak was from the point you mentioned. I got the O ring replaced and the issue is resolved.

Re: Honda CBR 250R

Glad to be of help. Do keep us posted on your upper engine overhaul job. One word of caution though, oversize is not recommended for the CBR. Requires the mechanic to know a thorough know-how and sourcing the right parts. I'd love to know more on this from your mechanic side, what oversize he's going to use, piston make et cetera, just anything you can infer. Thank you.

Howdy! Knock knock. Krish, you made me one happy person, glad to see you here again mate. Do upload some pictures of the tire so that we can get idea of the profile, especially on the back. Take care!

Cheers!
VJ

Re: Honda CBR 250R

Haha...Longtime Vijay. We need to meet up soon again, what are the chances of seeing you in Bangalore anytime soon ?

I have 1 pic as of now. Don't mind the shabby bike and the banged-up exhaust shield.



P.S: Trying to upload attachment but it seems to be getting added upside down only.



Cheers
Ride Safe
Krishna

Re: Honda CBR 250R

hello everyone, im getting 2015 cbr250r this week. engine oil capacity and coolant capacity is of how much ltrs? also suggest me some good engine oil.
thanks.

Re: Honda CBR 250R

Would love to Krish. Planning to, will PM you. Good to see her in good shape. Some TLC is all that there is to her and she'll be back to her good old spanking condition. Don't worry about that banged up exhaust guard, all it takes is less than 400 bucks, wash, chain lube and some polishing and she's ready to roll.

Engine Oil Capacity 1.4 liters without oil filter replacement
1.5 liters with oil filter replacement (NORMAL RECOMMENDED ML)
1.8 liters when engine overhauled.


Coolant Capacity 1.1 Liters.

Stick with Honda Throttle or Shell 10w40 for best results. Motul 3100 and 5100 too are recommended.

Cheers!
VJ

Re: Honda CBR 250R

IMO. From motul, the 7100 10w40 works the best. I personally didn't find the 5100, 300v or shell up to the mark for my riding conditions, which is, a bit on the quicker side ( not rough, just quick). The oil burnt sooner, the roughness in engine was prominent within 0.7-0.9 k kms. But after I started using the 7100, I change it at 2.2 k for my peace of mind, else it can go even more.

Shell advance ultra is best suited for riders who majorly likes to go easy on their ride.

***** All said above is based on my PERSONAL EXPERIENCE. And it is completely subjective.
Some may like it or some may like shell better.

Re: Honda CBR 250R

Thank you Ave. Indeed, experiences vary by user and all recommendations welcome.

Cheers!
VJ