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Old 9th September 2010, 10:50   #46
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^^ Hey navin,

Check a few more things. See if the decompressor assembly is already compressed i.e. even without pressing the decompressor lever. You can check this by physically looking at the assembly & check if the spring there is compressed or not. Also see if there is any movement there when you press & release the decompressor switch. If you still cannot make out, just ask the mechanic to lubricate & change the cable here. This wouldn't cost much & would take care of any issues wit the decompressor valve. I don't think there is anything more to this problem, give this a shot.

Also navin, how is the tappet adjustment. I fear it might just be a simple case of tappet over-tightening. When the tappets are too tight, the valves won't close properly, & depending on the severeness, the sound as observed would come. Although if it is the tappets, the sound is less prevalent.

Have you observed any smoke in the exhaust post this problem?

Ride safe, take care.

Last edited by .anshuman : 13th September 2010 at 10:41. Reason: Post edited to remove entire quoted post. Thanks
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Old 9th September 2010, 12:18   #47
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^^ Hey Blackfire,

I will surely make an observation of the decomp assembly as mentioned. I will have to check the tappet setting with the mech. There is no smoke from the exhaust from what i have observed lately.

Regards,
Navin.

Last edited by .anshuman : 13th September 2010 at 10:42. Reason: Post edited to remove entire quoted post. Thanks
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Old 9th September 2010, 12:21   #48
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^^ If there is no smoke, the piston rings & valves should be fine. Also if piston rings are the culprit, there will be slight ringing sound from the cylinder when revved.

Ride safe. Take care.

Last edited by .anshuman : 13th September 2010 at 10:43. Reason: Post edited to remove entire quoted post. Thanks
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Old 9th September 2010, 13:52   #49
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^^ You cannot rule out the possibility of worn out valves just because there is no smoke. Piston rings can be ruled out. And, as you rightly mentioned, it can also be a simple case of the over-tightening of tappets.

I once had the problem of the tappets tightening themselves after a long ride, though it is very rare.

Last edited by .anshuman : 13th September 2010 at 10:43. Reason: Post edited to remove entire quoted post. Thanks
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Old 11th September 2010, 15:13   #50
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^^ Hey jinga,

Yes true, that the possibility of bad valves cannot be ruled out entirely, but looking at the way navin's bike has lost compression, I would say that if the cuplrit are the valves they are in a big mess & would then surely leak oil. Also, the problem happened suddenly, & I doubt if a sudden severe valve problem wouldn't show any signs of smoking.

Please correct me if you think I might be wrong somewhere.

Take care & ride safe.

Last edited by .anshuman : 13th September 2010 at 10:44. Reason: Post edited to remove entire quoted post. Thanks
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Old 13th September 2010, 10:04   #51
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^^ Hey Blackfire,

I happened to experiment the solution of pressing the decomp lever while throttling. I somehow wasn't able to carry it before since the bike refused to start, but to my surprise the bike started on friday and I decided to carry out the experiment. So i took the bike to a isolated place and started throttling it and simultaneously pressing the decomp lever in order to remove the soot, at the same time i observed the exhaust and i saw black smoke coming out while revving hard. I think there is a carbon build up due to non-usage for a couple of weeks thanks to my busy schedule.

I clearly observed there was a black smoke coming out while revving but the smoke was limited not too much coming out.

Plz advice,
Navin.

Last edited by .anshuman : 13th September 2010 at 10:45. Reason: Post edited to remove entire quoted post. Thanks
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Old 19th September 2010, 13:15   #52
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This is where I have a leak in my head. Oil leaks from the place indicated by arrow. It started as a very small leak and has become a pretty nasty one now.
Bullet 350 Standard Air leak from cylinder head-leak.jpg


Waiting for the next service to get it welded.
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Old 19th September 2010, 19:27   #53
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Quote:
Originally Posted by navin_v8 View Post
^^ Hey Blackfire,

I happened to experiment the solution of pressing the decomp lever while throttling. I somehow wasn't able to carry it before since the bike refused to start, but to my surprise the bike started on friday and I decided to carry out the experiment. So i took the bike to a isolated place and started throttling it and simultaneously pressing the decomp lever in order to remove the soot, at the same time i observed the exhaust and i saw black smoke coming out while revving hard. I think there is a carbon build up due to non-usage for a couple of weeks thanks to my busy schedule.

I clearly observed there was a black smoke coming out while revving but the smoke was limited not too much coming out.

Plz advice,
Navin.
Hey navin,

Apologies for the delayed response, was busy with some things at my end itself & hence just couldn't respond back. As for your observations, there could be more than one reasons for the slight black smoke from the exhaust upon revving, one of the very common ones being a slightly rich mixture. But if the smoke was limited, & plus the bike had been left unused for some time, it's normal. Don't worry about it for now, unless it increases & becomes noticeable enough.

Also, what's the update on the compression loss problem?

Ride safe, take care.

@jinga: Hey buddy, the location of the crack seems a tough to reach spot. I wonder how deeply rooted the crack is underneath that fin. Do update on the repair work carried out & try posting some pictures about how the guy welds this crack (I mean, because the spot is slightly difficult to reach).

Take care, ride safe.

Last edited by blackfire_9 : 19th September 2010 at 19:30.
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Old 20th September 2010, 10:09   #54
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Hi Blackfire,

The compression loss is still there even after experimenting the decomp lever engaged and throttling at the same time, i hoped this would've cleared the soot that must have accumulated overtime, however i can still kick without engaging the decomp.

I would be giving my bike to mech to check out this issue alongwith sealing the air leak, but still can you give me an idea as to how much will a new head cost coz i believe i will also have to replace the valves plus the mouth of the cylinder where the exhaust pipe meets has to be welded as bored to fit the exhaust pipe.

I would like to know the price of a new head inorder to calculate the cost of repairs on the existing head.

Plz advice
Navin.
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Old 20th September 2010, 23:33   #55
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^^
navin, I would suggest that you start with the smallest things first like checking for the tappet adjustment & the decompressor assembly. With respect to the decompressor assembly, there is a possibility of it getting jammed & for some reason the valve is not getting closed fully. A way of visual inspection for this is to check for any sooty/carbon deposits on the parts of the head surrounding the decompressor valve assembly, as previously stated. Your mechanic would be able to check this.

A new cylinder head should set you back by somehwere around 4-5K, but get a quote from your nearest dealer as well. Plus, you can look around for one at some scrap motor market near your place. This option might require considerable time & effort but you might end up saving a lot.

For the repair work, I don't think you would have to spend anything close to the cost of procuring a new cylinder head, as the main issue till now is the crack which is to be welded. Unless something new turns up with the head, I would suggest you get the repair work done & run the bike & see how it performs. If you aren't satisfied, you should then order a new cylinder head.

Do update.

Ride safe, take care.
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Old 6th October 2010, 11:57   #56
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Hey Guys,

Update Time, I finally decided to repair the cylinder head instead of replacing it by buying a new one. I have given the bike to the mech for repairing the same.

The cylinder head is removed and given for lapping and welding, once installed i will give you the updates on whether it is working fine and the air leak problem is solved or not, i hope it does.

Thanks,
Navin_V8.
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Old 7th October 2010, 19:40   #57
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^^ hey navin, good to know that the bike has been handed over for repair work. However, did you inquire about the prices of a new cylinder head? If yes, what's the amount that was quoted to you?

Let us know about the progress.

Ride safe.
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Old 11th October 2010, 12:20   #58
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Hey Blackfire,

I was quoted 4.5K for a new cylinder head, i was willing to buy it at that point of time but thought lemme try to repair it first if it doesn't work well then i would buy a new head.

I would definitely update when i get the bike and test it.

Thanks,
Navin.
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Old 18th October 2010, 10:06   #59
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Default Air Leak Problem Solved

Hey Guys,

First of all i would like to thank all of you for giving me some valuable advice. I got my bike last week with the following repairs done:

1. Cylinder Head leak where the exhaust pipe meets the head is been argon welded, lapped and machined to fit the exhaust pipe to tap the leak
2. The kini kini kini sound from the engine has dissappeared maybe because the tappets were adjusted
3. The misfiring problem solved after carb overhauling
4. Changed the Valve with a new one
5. Accelerator cable changed as it was worn out
6. Gasket replaced between the cylinder head and barrel

Now the bike runs like a dream no air leak whatsoever, the overheating problem is solved too. Also as mentioned above the kini kini kini sound from the engine is gone. I am glad that the problem got solved now i am riding it like there's no tommorow.
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Old 19th October 2010, 16:26   #60
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That’s like bulleter.

Both (mechanic & welder) has done a good job.
Please provide brake up.
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