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**antz.bin** · 01-20-2013, 12:03 AM

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**asif** · 01-20-2013, 12:25 AM

Originally posted by Prith View Post

1. Off late my bike is loosing punch. I suspected compression drop, but now I know the reason.

You loosing punch could also be due to chocked air filter. Incase the filter is chocked, have it replaced/serviced.

Originally posted by Prith View Post

2. How do I clean this dust from entire manifold? Will aerosol sprays (carb clean) help in dislodging it from entire cylinder and blast it out the exhaust?

Simply unscrew the inlet i.e to the carb and outlet i.e to the intake port and clean it with petrol and wipe with a clean cloth. Make sure the carb is disconnected at both the ends.

Originally posted by Prith View Post

3. If I need to clean entire bore by hand, does this mean I have change the block piston, rings and lathe the valves to get back the punch?

Ahme! You kind of lost me here. How old is your bike and how many km have you clocked? Please share details to ensure support from other members.

Originally posted by Prith View Post

Will A.S.S do this kinda of job? You will not believe what one Bajaj A.S.S told me last Friday - "We do not clean carb now days sir, do not touch it". If this is the kind of knowledge capital that Bajaj A.S.S in Hyderabad has, then I'm screwed with the current situation. They might very well wipe it with a ragged cloth and say, its clean.
Guys, need your advice on this case.

Its true 4s carbs don't require as much cleaning as 2s does.

**Prith** · 01-20-2013, 08:40 AM

Thanks Asif Bro

Originally posted by asif View Post

You loosing punch could also be due to chocked air filter. Incase the filter is chocked, have it replaced/serviced.

I cleaned that out too. Cleaned with kerosene, washed with mild detergent, sprayed 20W40, and cleaned the filter chamber with petrol, then pushed it back in. Though muffler note has changed, but punch is still missing.

Originally posted by asif View Post

Simply unscrew the inlet i.e to the carb and outlet i.e to the intake port and clean it with petrol and wipe with a clean cloth. Make sure the carb is disconnected at both the ends.

This is done. While cleaning this did I find out the alloy dust in the chamber.

Originally posted by asif View Post

Ahme! You kind of lost me here. How old is your bike and how many km have you clocked? Please share details to ensure support from other members.

3 years and 20K. City driving, shared with friends.

Originally posted by asif View Post

Its true 4s carbs don't require as much cleaning as 2s does.

Hmm... but if I keep my bike idle for say a week, I have to kick start it atleast 10 times. The usual jet blocking by Petrol wax is very high in my bike. I run it in very lean condition since I dont do high revs.

The most important part is, how do I get this complete dust stuff cleaned off from the chamber, and on piston. Though now I know the gummy nature of it is due to vapour from Carb, cleaning is of priority for me now. For loss of punch, would changing the valve, piston, rings do the work?

**asif** · 01-21-2013, 12:28 AM

There should not be a requirement of going for a engine overhaul for a 20K run bike. However the usage depends specially when used by several people like you have mentioned.
Have a compression check and see if you loosing compression before opening the engine up. What are your intervals of service?

**Prith** · 01-21-2013, 01:21 PM

Originally posted by asif View Post

There should not be a requirement of going for a engine overhaul for a 20K run bike. However the usage depends specially when used by several people like you have mentioned.
Have a compression check and see if you loosing compression before opening the engine up. What are your intervals of service?

My bikes visit service station once every 3 months. But, now days I do all things myself and take it out to svc stn only when I dont have proper tools. To give a proper description of compression loss, its almost like when it hits 55Kmph, the RPM peaks at 5K and after that no matter how much throttle I open, it just goes flat. Engines spins, no torque. Most probably the clutch has gone kaput, and one another sign of compression is that I get misfires when I travel downhill with clutch disengaged/engaged. Just wanted to know if an overhaul will do this good for next 20K.

**Honda_CBF** · 01-24-2013, 01:13 AM

First of all, dont run it LEAN!! this is the main cause of your problem. this also causes power drop. and this IS also causing pinging/detonation within engine. and the alloy dust you mention is from piston (i guess). pinging is eating your engine away man!! get it completely checked asap

**Prith** · 01-24-2013, 09:42 AM

Originally posted by Honda_CBF View Post

First of all, dont run it LEAN!! this is the main cause of your problem. this also causes power drop. and this IS also causing pinging/detonation within engine. and the alloy dust you mention is from piston (i guess). pinging is eating your engine away man!! get it completely checked asap

dude...that is scary. I did my best to retune it last weekend, but power drop is really irritating.. no matter what I do with the throttle, mid 5000-6000 is total disaster. What will be the damage on my pocket if I change the complete piston assembly?

**Honda_CBF** · 01-24-2013, 10:46 AM

Yours is a P150 right? Rebore+piston+rings+consumables+labour can cost from 3k to 4k. If anything else is needed then price will go up further. Also note that, if your are getting the head opened, it will be better to check & lap the valves. but before getting it opened, get troubleshooting done. First of check compression it should be between 160psi to 180psi (160 is on lower side) get the carb checked & tuned, along with carb check intake boot, air box etc, which can have a crack and cause lean conditions. Also, check spark plug, side electrode should carry tan color. and if you find that alloy dust in spark plug then I thing your piston will have a hole.Dont panic. just troubleshoot. start with small things..

**Prith** · 01-24-2013, 03:38 PM

oh man...just when I thought I can get some nice riding accessories.. dude.. this will dig a big hole in my purse. I recently changed sparks, the old ones were almost eaten up. Compression is something that I'm sure to check cause this is the main problem. Air box was clean last time I checked and carb too looks pretty clean for a 20K bike. Decarb is something I thought I can do to avoid the expense, but not able to find a suitable svc stn with required equipments or skill. Did you ever try doing this?

**Honda_CBF** · 01-24-2013, 06:46 PM

Decarb is not much of a hectic task bro. Also if they open cylinder head, they I'll be doing decarb. Its part of the job. And i've only done it in 2 stroke scoots. and they are child play, err.. for me

but 4 stroke is all different. other xbhpians have done this, they may help. . for the time being tell me more about that alloy dust.. is it really like dust I mean "dhul" (in hindi) ?? engine heat should cause it to melt or at least stick.. Btw, how's the overall performance? Did you tried peeking into cylinder through spark plug hole?

**Prith** · 01-24-2013, 09:06 PM

Originally posted by Honda_CBF View Post

Decarb is not much of a hectic task bro. Also if they open cylinder head, they I'll be doing decarb. Its part of the job. And i've only done it in 2 stroke scoots. and they are child play, err.. for me

but 4 stroke is all different. other xbhpians have done this, they may help. . for the time being tell me more about that alloy dust.. is it really like dust I mean "dhul" (in hindi) ?? engine heat should cause it to melt or at least stick.. Btw, how's the overall performance? Did you tried peeking into cylinder through spark plug hole?

Yup.. did'nt want to do this desi shtyle

, but more like phoren style by using decarb solution and gadgets. Coming back to dust, its very fine. Its almost the consistency and texture of fire cracker powder that we see in diwali crackers. Silver, little heavy (solid to touch), fine and sharp. If you rub it between your fingers, you can actually feel it dig into your skin.

In my bike, due to carb condensate/vapor it actually got coated on the sidewalls of the carb-manifold rubber hose and manifold connector part. I was able to see burnt oil stain inside but nothing more. Overall I will NOT complain about milage. It is good enough and my driving habits are not of stunt riders.

. If only I can find a svc stn in Hyd for doing this work for me.

**Honda_CBF** · 01-25-2013, 10:53 AM

Originally posted by Prith View Post

Yup.. did'nt want to do this desi shtyle

, but more like phoren style by using decarb solution and gadgets. Coming back to dust, its very fine. Its almost the consistency and texture of fire cracker powder that we see in diwali crackers. Silver, little heavy (solid to touch), fine and sharp. If you rub it between your fingers, you can actually feel it dig into your skin.

If thats so, then that dust is not from the engine.. I dont think one can rub piston material like that. its from outside. check air filter side. have heard instances of kids putting sand into crank case in xbhp itself.

And dont think that decarb solutions will help they only partly clean the engine (maybe not even 50%). manual decarb is best. but dont waste money on decarb now. get the engine head opened and checked. that dust sounds so catastrophic

Originally posted by Prith View Post

In my bike, due to carb condensate/vapor it actually got coated on the sidewalls of the carb-manifold rubber hose and manifold connector part. I was able to see burnt oil stain inside but nothing more. Overall I will NOT complain about milage. It is good enough and my driving habits are not of stunt riders.

. If only I can find a svc stn in Hyd for doing this work for me.

That carbon-oil-pertol's fine coating inside those hoses & manifold is ok and normal unless its too much.

And get the head opened to check things inside. you may need to get new piston too.. but if you dont have money then dont ride your bike for time being. because more you'll ride, more dust gets in and more dust =more damage..

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