Re: Karizma/Karizma R

Guys, need help.. I own a CBZMA, two days ago the bike stopped abruptly when riding. I had the timing chain noise for two days & then I thought I'll fix it this weekend & kept riding & it gave up now. It was like something was broken inside when the bike stopped with a noise. Opened the engine magnet case & confirmed its the timing chain along with the guide which is completely naked(Rubber coating is gone), this chain guide has come out of its position.
Opened engine head & found that the valves are bent.
Got new timing chain, timing chain sprocket, two guides, tensioner & valves+valve oil seal. Now, the issue is, my bike runs rough & there is smoke once the bike goes north of 5k on tacho.
What can it be? I happened to inspect the bore & its healthy. No seizure marks/scratches. Other possibility is when oil leaks from valve stems. Lathe guy checked the valve guide & said they are good & replacement is not needed. What should be done next? Its embarrassing when there is smoke from a 4stroke. Help....

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ZMA front sprocket has 2 holes & rear has 4.

Re: Help regarding Karizma R

Approved and Merged

Re: Help regarding Karizma R

Please give further details ...km run so far..oil used..last oil change reading..air filter condition..rpm at 85 kmph..spark plug condition ( if possible a good pic too) ..whether rpm is rising but speed is not etc. I am sure the experienced members will help you out of the situation.

On Grand 2

Re: Karizma/Karizma R

Hey

I have been reading up on crankshaft balancing and honestly didn't understand much. I got my cylinder bored and crank serviced by a somewhat shady mechanic. So its been around 8000 kms since boring and right now i am just hoping for the best... I am kinda sure he's made my crank imbalanced but right now there's no extraordinary vibration or other noticeable effects.

Anyone interested please check out






And if possible explain worst case scenario to expect...

Re: Karizma/Karizma R

Your bike's timing has gone wrong.

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Re: Karizma/Karizma R

"regular" engine tappet noise?? [emoji15]You sure you're not referring to a bajaj bike here? Cause AFAIK Zmas are not regular on tappet noise. At all. Unless you've got a problem with your bike and somethings not right. That slide you've mentioned might just be the cause. If it is I suggest getting the whole set including the diaphragm rubber, slide, slide pin and the small guide which the pin seats into. It ideally comes with the pin in the same packet. If it's original.

At 35k, valve clearance checking/adjusting can be done for assurance. Decarbonising only if you're sure you have crappy fuel at your place. All the best.

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Re: Karizma/Karizma R

I own a bajaj for the last 11 years and I have to agree on the engine noise part thats true!!!!!:banghead:

Divyansh....

Re: Karizma/Karizma R

Either Bajaj has accepted engine noise as a trade mark sign, or subsiding engine noise is proving a too herculean task for bajaj to counter.

Re: Karizma/Karizma R


I always thought that was something unique and intentional, didn't realise it was a defect 😁

Re: Karizma/Karizma R

From a little experience with bikes, I have come to understand the following.

1. Bike will make noise and vibrate, as there are numerous moving parts inside it.
2. Only worry if an abnormality happens more than once.
3. Don't stick to generic guidelines, no two riders are the same. If someone can manage xxxx'kms on xyxy oil doesn't mean that you should do the same, when your bike feels rough, inspect oil and change if necessary, be it 100kms or 1000kms.
4. Never wash/water service the bike when you're out of your geographic comfort zone.
5. Don't even think about mileage/liter unless you find yourself refilling unusually more than normal.

Re: Karizma/Karizma R

Perfect buddy.. I don't understand why riders compare their rides with other rides.. I mean, one will maintain their bike perfectly and yet the bike doesn't feel good to ride, whereas the other might not maintain properly yet the bike feels good. reason could be the way he is riding it..

1. Very True. My ZMR makes quite lot of vibrations and noise from the plastic as compared to the other ZMRs.. Do I care? No ways..
2. True. Once my bike stopped on my way back home which panicked me.. however I figured out it was an air lock or something.. The bike didn't start for almost 5 self starts.. I opend the fuel lid and closed it back after few seconds. The bike started in single self.. since then the issue didn't come again.
3. When I used Rimula R4 on my ZMR, I had to drain it every 1200 kms.. whereas [MENTION=41586]Divya Sharan[/MENTION] had a better drain interval.. Did it matter? No, because I didn't want to screw the engine.
4. Something I follow from the very first time I started touring.. It can cause severe electrical failure and for a bike which is dependent of electrical like our bikes, it is a big time risk..
5. Mileage? Who cares.. the FE depends on the riding condition, road conditions and climatic conditions.. Also depends on how you ride.. if I reach 100 kmph at a slow pace, shifting the gears at the recommended RPMs with slow acceleration.. and the other person climbs upto 100 kmph in an insane manner shifting at red lines, it is very obvious the latter is going to return a very minimum FE.. My bike was giving a decent FE of 43 kmpl at speeds of 100 kmph and suddenly the FE reduced drastically to 33 kmpl on highways at the same speeds.. I found out it was because the chain got tightened and the rear tire side wall was rubbing against the Chain guard. After I set right, the bike started giving me decent FE again

Re: Karizma/Karizma R

Vibration and rattles are a characteristics of four stroke single cylinder engine. What should alarm you is when I goes out of the acceptable "noise" limit.

Cheers,

Karthik


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Re: Karizma/Karizma R



Thanks for the input pixantz, but how do I rectify this? I don't get it still, could you kindly elaborate how timing fault will induce oil in to the chamber?
Timing is set when the magnet mark is in alignment with the timing chain sprocket - - mark. this is what I do. Help me to fix this.

I personally believe it is best to leave timing related issues to the experts. Give it to a good mech and he should sort it out. There are various ways that oil could enter combustion chamber like warped piston rings, damaged valve-stem oil-seals.

Basically wrong timing whacks the hell out of most components in the engine head including your valve stems, guides, oil seals, cam shaft, rockers, etc depending on the extent of damage.

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Re: Karizma/Karizma R

Hmmm. so, this has to be taken to svc center. Also, I have frequent air lock issue. Everytime i start my bike in the morning or in the evening after long parked hours, bike refuses to start. Have to open tank, shake it well and open throttle as well & lock the lid & crank, it starts. I thought its fuel flooding, so I always keep the petrol tap in closed state, no change in this behaviour. I ensured the carb is tightly held to the manifold on both ends. Any clue on what could be wrong?