Re: Karizma/Karizma R

Now retune the carburetor again by factory method as the afr will need re-adjustment as you replaced the bore-piston, that should take care of rpm decreasing slowly.
A properly tuned Karizma idles at 1100Rpm as in Fi engines.

Did you swap nithin's slide-spring and test?

Re: Karizma/Karizma R

This is what happens when wrong tools are used for the job at hand. HMC mechanics were happily ready to simply pound the thing to submission...

Now stuck here..should I have the screw drilled and taken out? As it is just 12 mm, I'm worried about causing any damage to the master cylinder..Also placed an order for Vessel JIS insert bits with a tools guy from chawri bazar...

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Re: Karizma/Karizma R

Once the same thing happened to me too. My mechanic put the - screwdriver in cross angle (anti-clockwise) on the screw head and hit the screw driver head with hammer slowly. After sometime, the screw started to rotate. I am using some aftermarket screws now.

Re: Karizma/Karizma R

Hi All,

Cross posting this cause it ended up on the wrong thread.

Thanks [MENTION=41586]Divya Sharan[/MENTION]

Re: Update

If your problem of too much RPM variation is solved with TWO "O" rings it just confirms that the AFR screw was leaking air through threads....The idle RPM variation is normal and nothing to worry about. The cutting of slide springs by 3 turns is not the reason for it. The slide spring damping will be 1/9th less now compared to before...this was suggested to ensure better acceleration and a quicker slide movement , but does not in any way interferes with carburetor functioning.

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You can drill the stuck screw ,and it will not damage the Master Cylinder functioning in any way....Take care while drilling and stop when the head of the screw had been drilled out..this will enable you to remove the top of Master Cylinder and the remaining screw will be protruding enough to be taken out with a Pliers.

Re: Update

I did retune the carb. This slow falling of rpm was there when my carb was used in Nithin's bike. I couldn't specifically use the slide and spring from Nithin's bike. Will do it if possible.

I will retune the bike and see. And regarding this rpm variation, another issue is, the difference between cold engine idling and warm engine idling is more than 600 rpm. Suppose if I set the warm idle at 1500 rpm, when the engine is a little cold, it tends to fall below 1000 rpm. May be this is not due to the carb and could probably due to mechanicals in the engine not working optimally. Just an assumption.

Just now revved the bike to 8k rpm, and found a little white smoke from exhaust, indicating piston rings not in proper seal. Will have to keep an eye on oil level.

please help me guys

i have a problem with my karizma r please help guys i m fed up with my bike...i have taken it to many mechanics everyone says some or the other problem..
so what really is the problem i dont understand.
When i start the bike it does not start i have to give the choke ,its rpm rises quickly.now ok it gets started when i do a few kms lets say 2-3 .the bike shows lagging response when i accelerate it does not produces much power n it seems something is controlling it..and the bike heats extremely.sometimes i have to splash water onto it (seems funny wen u do this in public) ..moreover after a few kms when i press the clutch to brake the rpm rises quickly to 3-4000..n its very difficult to break like this..
so i m nt having a nice time in short as mumbai is full of potholes (blame it on the govt) ..
THINGS I HAVE DONE (so plz dnt suggest me all this..)
1.changed engine oil
2.cleaned my carburetor 2 times..

mechanic is suggesting me to open the cylinder head n fix the valves as it gets overheated n expands ..(is this the problem..??!) n if it is then how much it will cost?
i bought it as a second hand bike..so its posing me such problems ..hope it will get fixed..
also when i apply the rear brake bike doesn't stop n gives screeching sound so what is to be replaced..??

Re: please help me guys

Treat it with respect, it'll be good. Scrap it and it'll fart you in the face!

There are various things in your post to notice.
1. Fried clutch plates.
2. Bad riding style! Why use the clutch while braking?
3. Why splash water on a hot metal body? Let the bike cool down by stopping it.

Re: please help me guys

Did you do a proper service of the bike apart from just changing the engine oil and cleaning the carburetor? What is the condition of spark plug, air filter, rear brakes, chain and sprockets? When did you last change the spark plug and air filter? Replace them if you don't know.

1. Check the carburetor insulator for any air leak. Replace the AFR screw too to contain any possible air leak.
2. Improperly closing valves can cause these issues. You need to open the engine head and check the condition of cam chain, camshaft, and valves. Replace the valves if needed. Clean the head and do valve seating job. If replacement is warranted, valves cost 550 rupees and timing chain costs 500 rupees. Labor charges extra.
3. Check the condition of clutch plates. Replace them if needed.

How many kms run on your bike?

Re: please help me guys

ohk i get it ..i will improve my riding style but why does it heats up so early ?? n after overheating it stops immediately n gives a knocking sound..n it wont start .i have to swipe the key back to get it working..n moreover if i drive at low speeds the bike laggs n stops..so i have to keep the speed high only n rpm shows 3000-4000 on normal riding..even i have done the tuning several times

Re: please help me guys

Shashank, do you notice any exhaust smoke? Does the idle rpm stays after the bike is hot? Check for any residual in the fuel tank and clean if needed. Replace cam chain tensioner also along with timing chain if needed.

Re: please help me guys


ok i will do what you say replace the valves..but i have already changed the air fuel screw long back..air filter is clean .(as its new) ,spark plug is also working got it checked several times..rear brake is posing problem ..(will change it soon) chain n sprocket is fine ..and what is a carburetor insulator..??

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HAHA ...i have got my tank cleaned also sir..now i dont know what is cam chain tensioner and timing chain will check it..
i been a regular visitor of this site seeing people problems related to my own and implementing it(although it is nt working) so finally i decided to get my problems solved here..

Re: please help me guys

Replace the spark plug if its more than 8k kms old. Carburetor insulator is the connection between carburetor and the engine head (a big round black tube). First correct everything outside the engine. If symptoms persist, then open the engine. Adjust the tappets too (valve clearances).

Re: please help me guys

there s no white smoke so piston rings are fine..n the bike rpm rises on one go n doesnt come back that often and it goes on increasing as i ride it..goes to 5000 also..when i press clutch it reaches heights..!!

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omg !! it seems i have done everything ..!! i have replaced that too it was actually worn out ..and there was air leakage so i thought the increase of the rpm must be cause of that but after replacing it also the problem persists..!! hero honda service center guys are telling me to change the whole carburetor..(which is nt in my budget)
and just for the record i had given my bike to some mechanic when it was giving jerks while riding for a few kms he installed some coil in the bottom positon of some other old bike and just took off the TPS said it is of no use it may be the cause of problem..SO IS IT RIGHT.??

Re: please help me guys

Could you be more clear? Its difficult to understand without any punctuations. Are you saying the TPS from the carb is removed? And what is that coil?