Engine knocking and engine overheating!

Hello everyone, I'm new here so, Hi to all.

I recently purchased a 2010 Karizma R. Had it serviced at a nearby Hero SS.

Made the following changes:

1. Installed a new Carb (old one was bad)
2. Changed chain sprocket Kit (old one was bad again)
3. Changed Cam Tensioner (Mech told me it was all worn out)
4. Changed engine oil to fully synthetic Shell 10w40.

After this, I had the bike running smooth for about a few days until:

1. I started observing knocking sound and sort of like a chain vibrating sound from the engine.

I read through the forum regarding this and most of the time, the cam tensioner change resolved the issue, but not in my case.
2. I also observed overheating from the engine, even after short rides in Bangalore, to the poiny where it radiates out and can be felt on the legs.
3. Also there is this irritating chain rubbing sound from the front sprocket area which can be heard when coming back from work in the night(in silence), and it faded away as I oiled the chain once but came back soon after few days.(Donno if I should be concerned about this)

My mechanic telling me we have to change some chain & pads inside the engine , which would cost another 3k. Is this really true?
I mean, I don't think he is taking effort to diagnose the root cause of all these problems, and just giving me one word solutions.


Apart from all this, the bike seems to run fine, got decent pick up and can cruise at 100@6k rpm smoothly if I want it to.


As a new owner of Karizma, i know little about the bike.

So kindly help.


Many Thanks

Re: Karizma/Karizma R Ownership Experience

use rtr 180 ones ,they reduce handlebar vibrations.

Re: Engine knocking and engine overheating!



Could someone please help me with the above?

Update : The engine knocking/rattling sound increases as engine gets more hot. Im not able to understand the root cause. Please help

Thanks!

Re: Engine knocking and engine overheating!

It seems the timing chain has worn out, and the mechanic is correct. If the engine is not drinking oil or smoking, you could just get the timing chain and pads replaced, the head decarbonized, and valves cleaned/replaced. Also, if the cam is not worn out, no need to replace that too. I am not sure how much timing chain and pads cost for Karizma but should not cost more than 1.5-2k if the cylinder and bottom end is healthy and cam does not need replacement.

Re: Engine knocking and engine overheating!


Hi! Thank you for your advice.

Is this something that I need to get done as soon as possible or is it something I can stall for a few months?

Also could you please help me with what you actually meant by cam? Cam chain? Timing chain and cam are different things are they?

Im not thaat techy when it comes to machines sorry for asking too many questions.

I guess the cylinder is fine, like I said pickup is good n running is smooth. And for the smoking part, there was a one off scenario a few days after I had changed my engine oil to fully synthetic where my engine gave out white smoke but never happened again.
I think it could be because the synthetic oil being lighter might have creeped into the combustion chamber. Or you could shed some light on that as well?

Re: Engine knocking and engine overheating!

If there are no other symptoms other than noise, I think it should be fine for a few months. However, do keep checking the oil level at least once a week. If the piston and piston rings have slightly gone bad, you may not notice any change in performance most of the time. Checking the oil level will ensure that engine is not starved and chances of engine overheating and seizing is reduced. I have had cases in my RTR wherein some of the oils burned more than others, esp synthetic ones. In case the valve guides are worn out, they could leak too, and let oil into the combustion chamber. If the bike smokes while deceleration, chances are valve guides are gone.

Cam: known as camshaft is driven by the cam or timing chain and has lobes which push the valves down as per the set durations.

Cam chain and timing chain are the same.

Just go easy on the throttle till you get the head opened and worked upon. If the chain is too loose, it could skip few teeth and damage the valves & piston. Ask the mechanic to check the condition of the chain by just opening the head cover, without removing the head or the cylinder & piston.

Re: Engine knocking and engine overheating!


Thanks a ton, brother. I'll do as you said and will keep you updated.

My bike does not leak any oil I can guarantee that. I had the O rings changed fairly recently. However, I have not yet observed how much oil engine is drinking. I'll check that. I used Shell 10w40 synthetic oil which should ideally last upto 4-5k kms and I did it fairly recently like a few weeks back. But I can confirm that the engine does overheat after say about 20+kms of city ride in Bangalore to the point where I can feel it on my legs. Is that normal or trouble?
I'll observe the oil level today and will get back to you.

Thank you once again for your quick responses.

Re: Engine knocking and engine overheating!

Overheating of a air cooled engine could mean anything actually - from a Lean AFR ratio, to high ambient temperature, to even engine oil that needs replacement, or in your case chain rubbing against the pads. Even carbon in the head could cause hot spots. Air cooled engines are very robust and can withstand a lot of heat. However, if you notice anything out of ordinary do get it checked out

Re: Engine knocking and engine overheating!


Hi. I'm gonna get my chain & pads replaced this week. But before that I just need some confirmation that it is the issue, coz I'm gonna spend about 3k.

Please view the video I posted with engine sound, and kindly let me know if this a sound from a bad chain or a if a valve clearance might solve the problem. This video was recorded after a short ride so the engine is warm enough.





Many Thanks!

Re: Engine knocking and engine overheating!

Hey bro, this is an online forum and since we've not seen your bike in person to diagnose the issue we'd not be able to give you a 100% correct answer irrespective of how many videos or audios we listen to, all we can provide is our suggestions that you may take with a pinch of salt.

Speaking of which my best guess is the timing chain as well.

Regards,
A.P.

Re: Engine knocking and engine overheating!

Agree to what Ashwin says. It sounds like timing chain or tensioner gone bad

Re: Engine knocking and engine overheating!

Thanks a lot guys. Appreciate all your help!

Re: Karizma/Karizma R Ownership Experience

Finally got the stuck AFR screw out at the lathe. Replaced with a new one which I had stocked long back.
Now the bike is revving freely without any hiccups and starting issues are gone.

Re: Karizma/Karizma R Ownership Experience

Hi All,

I bought a used karizma r 2012 model about 5 months ago has run about 23k kms, I'm using this bike daily for commuting to work(24kms)and I love riding it. Below is the work done so far.

1) Chain sprocket-Hero oe.
2) Battery- Exide 7ah(Battery was good, it died since taillights were continuously on due to a faulty brake switch).
3) Engine oil- Motul 3000,running shell ax7 10w 40 currently,
4) Carb- Complete disassembly and cleaning.(Cleaned it myself since ocd kicked in, Mech said it was already clean , Found pilot jet was clogged now bike starts quickly and idle is steady).
5) Tyres- Front Apollo Actizip F2 2.75-18 , Rear -Apollo Actizip R3 100/90-18.

Now coming to the issues related to the bike.

1) Bike vibrates crazy above 4k rpm, need to find source of this vibration, previous owner has removed stock handlebar weighs and installed unicorn handlebar ends. But foot pegs also vibrate so this can't be the only reason.
2) Rear suspension is very hard due to this I think the rear fairing mounts have broken. Also need to check swing arm bushes along with this.
3) Bike struggles to go above 80 kmph feels like engine is straining or lean. Kicker slides easily, Is the compression less?. Bike doesn't consume oil nor smokes.
4) Speedometer glass(plastic) is broken.

Will work on these issues once the weather clears up. Also have a few mods on mind.

Re: Karizma/Karizma R Ownership Experience

Yes I do