Unofficial Royal Enfield Community Forum
Royal Enfield Motorcycles => Bullet Iron Barrel => Topic started by: tukarthik on October 07, 2013, 02:49:17 pm
-
I recently bought a classic 350. I just completed my first service. Since then, i am hearing a TIK TIK TIK sound when idling in neutral gear. I hear this sound only when i start a cold engine (engine rested for few hours). This sound doesnt seem to come while riding or when starting the engine when it is hot. The sound is pretty loud. Anyone has any comment on this??
-
It could be a number of different things..
Considering that it only seems to happen when cold, the indicators would point to piston noise(slap), because the piston grows larger when hot, and would only make the noise when cold.
So, you might have a worn bore.
Just a guess.
-
I don't know nearly as much as Ace, but wanted to suggest something. Can you tell what part of the engine the TIK is coming from?
As part of your first service, did you adjust the tappets? If the valves are a bit loose I suppose they could be a bit louder when cold but quiet down once they heat up a bit. Just a thought I had, but maybe worth considering.
-
tukarthik
If your Classic 350 is a newly made one (after 2009) it has the new UCE engine.
These engines have an automatic decompression device built into the exhaust camshaft.
This is activated by a light spring pressure when the engine is not running and deactivated by centrifugal force as the camshaft is rotating after the engine starts.
Normally, the device is made to retract after the engine reaches a idle speed over about 750 rpm but with cold oil, they will sometimes get stuck in place by the thick oil and stay in the "active" mode and make a TIC, TIC, TIC, sound.
Usually, slightly 'revving' the engine will cause the device to retract and the noise will go away. If it doesn't, as you've found, after the oil heats up the centrifugal force will retract it to its "running" position.
By the way, if your motorcycle is a UCE model you should post your questions in the area of the forum titled "Bullet with the UCE engine".
It's confusing but this area of the forum is intended for the old Iron Barrel powered motorcycles.
-
tukarthik
If your Classic 350 is a newly made one (after 2009) it has the new UCE engine.
These engines have an automatic decompression device built into the exhaust camshaft.
This is activated by a light spring pressure when the engine is not running and deactivated by centrifugal force as the camshaft is rotating after the engine starts.
Normally, the device is made to retract after the engine reaches a idle speed over about 750 rpm but with cold oil, they will sometimes get stuck in place by the thick oil and stay in the "active" mode and make a TIC, TIC, TIC, sound.
Usually, slightly 'revving' the engine will cause the device to retract and the noise will go away. If it doesn't, as you've found, after the oil heats up the centrifugal force will retract it to its "running" position.
By the way, if your motorcycle is a UCE model you should post your questions in the area of the forum titled "Bullet with the UCE engine".
It's confusing but this area of the forum is intended for the old Iron Barrel powered motorcycles.
Yes, I keep forgetting that they have been calling every new model "Classic" for a few years now, so nobody knows what model is what anymore.
Sheesh!
-
If it's an older Iron Barrel 350, loose valves should tick louder when it gets hot.