Hi everyoneLately a few noises from my bike's engine have increased a bit and causing me the trouble of looking into them.I have been replacing oil every 3k and giving a 20-25 sec warm-up time to the bike every time when I ride it after a few hours of standing.I think that the sound is coming from the head of my bike but am not so sure about it.Can the gearheads here please help me by pointing towards the source of the noise if possible so that I can have some information about it before taking it to the local RE workshop mechanic.Audio files are available here:https://soundcloud.com/achint-agarwal/voice-002https://soundcloud.com/achint-agarwal/voice-001Thanks!Aditya
This clicking noise was not there few months back and is quite loud now. Also the frequency of this noise increases and decreases with the amount of throttle use.
once in 3-4 weeks I ride on the highways with full throttle use maxing at 110-115 kmph
My bike does not have the oxygen sensor but I will start giving some more warm up time now onwards.
Ah, so I'm presuming yours is the Indian domestic market Classic 500/350, which has a carb? Or it has an ECU without the oxygen sensor. This can't be right though? @mattszMy idle RPM is in the same region, however the decomp clatter is only present during a cold start or if the bike has been sitting for a couple of hours. During summer, the decomp clatter on cold starts reduces significantly for me. As you've mentioned, it will be great to know the result/cause of this issue and hopefully you'll also be able to sort it out, as I am sure you probably have the same issue also.
Tom, thanks for clarifying that the domestic EFI REs are open-loop. I had read that on the Indian RE/Team-BHP forums before, but couldn't remember. Also, I understand that low idle RPM is not good for UCE bikes. However, by low I meant RPM which is around 950 (approx) and less than 1300. The idle spec for UCEs is 1050 +/- 250 RPM. Mine is approximately around 900~950. The decomp clatters on cold starts for less than 30 seconds. But I don't even let that happen as I just kickstart it holding the 'manual bi-starter' and keep holding it for those 30 secs till the oil gets going. Depends on the weather too - sometimes I only need to hold the bi-starter for 5 seconds or less (on cold-starts) and then I let it go = nice thump thump thump around 950RPM. This is what works for me. edit -Also while we were on the idle RPM issue, listen to this - http://www.youtube.com/watch?v=jku-OXow3Ns It is the domestic standard 350 UCE with carb. Now, that idle just sounds like what Iron Barrels are known for doing easily. That is surely around 800-850RPM. I can't hear any decomp clatter there albeit piston slap? And I am 100% sure if I had to lower my idle just a bit more, the auto-decomp would kick in and start its clack clack clack even if the engine was warm/hot. Interesting.
Also while we were on the idle RPM issue, listen to this - http://www.youtube.com/watch?v=jku-OXow3Ns It is the domestic standard 350 UCE with carb. Now, that idle just sounds like what Iron Barrels are known for doing easily. That is surely around 800-850RPM. I can't hear any decomp clatter there albeit piston slap? And I am 100% sure if I had to lower my idle just a bit more, the auto-decomp would kick in and start its clack clack clack even if the engine was warm/hot. Interesting.
It wasn't as loud or clanky as my decomp was. And it didn't follow the rpm changes like that one does. If fact, if you revved it like he did, it would quit clanking. I'll stick with cold piston theory.Bare
Rattle and tick..... Rev it Singh.
My G5 is also developing similar bad engine noise, more pronounced than C5 of ironhead. The sound is less when engine is cold and oil is thick, but more when the engine is hot after riding several miles as in the link below -https://www.youtube.com/watch?v=BdAGt_s07XA
Between 28 to 50 seconds of video, I hear a resonating tuning fork sound as if a hollow bell was getting struck repeatedly.
Yeah, I hear that little bit of ringing now Singh. Thats not your rear head steady mount, or your pipe is it ? This is a new sound, and you didn't hear it in the summer when the oil would thin out quicker?..... Using thinner oil for the winter ?
FWIW, it sounds to me like a piston slapping at idle.How many miles on the engine?
Singh, you could try a compression test. Do it using the starter, with a fully charged battery....hopefully the auto decomp won't skew the readings this way. Disconnect the fuel pump and throttle wide open when you do it..... see what you get.