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Puch Maxi Moped
Ticking sound

Tags: ticking sound, engine
Author: Thomas R.

A while ago I noticed something 'strange'. I don't know if it always been like this, but my attention got grabbed by a strange ticking sound. I decided to do my research and found 7 possible causes.


ABOUT THE TICKING SOUND

When I was first hearing the ticking sound, my engine was well warmed-up and could only be heard when running idle. In the video below, I made a little video where you can clearly hear that ticking sound.


the7 causes


1. THE CRANKSHAFT HAS SOME PLAY

How to solve
Check if your crankshaft has some play. If it has some play you might want to replace you crankshaft bearing. biggend or small-end.

How to check
Remove the spark plug, take a screw driver and gently  press the screwdriver against the piston. If you feel some play, this is probably causing the ticking sound.


2. THE PISTON IS TOUCHING THE CYLINDER HEAD

How to solve
Your piston might be hitting the cylinder head because of a gasket that's to small. You can try to add a bigger base gasket (e.g. 1mm) or even use 2 normal base gaskets to see if this solves the ticking sound.


3. WRONG FUEL - OIL MIXTURE

How to solve
Always respect the 1:50 fuel-oil mixture ratio in case of two-stroke oil. In case you use Triboron, respect the 1:100 Fuel-Triboron mixture.


4. A BADLY ADJUSTED IGNITION, CARBURATOR OR AIR LEAKS

How to solve
Adjust your carburator, spark plug and ignition accordingly and check for air leaks.


5. BADLY ADJUSTED IDLE SCREW (RPM TO HIGH)

How to solve
Adjust the idle screw appropriately. Your Puch moped should run smoothly in idle, so not to high in RPM. A rule of thumb that is often applied is that your rear wheel should not move while running idle. When adjusting the idle screw, make sure the engine is already warmed-up!


6. WORN PISTON RINGS

How to solve
Check your piston rings. If the gaps of the piston rings are dirty or your piston has a brown colour after the ring area, you might want to replace your piston rings.


7. DUDE RELAX, IT'S A PUCH MAXI

How to solve
You can't and perhaps you just don't need to. A Puch Maxi just makes a lot of sound and certainly in case use an Airsal cylinder (they tend to make a lot of sound).

I do know the feeling, you just put your engine back together and then you start hearing things. But it might be normal, as long as you don't have any other issues (damage to your piston, cylinder or any running issues) you can decide to just let it be (what I did). Trust your rebuilded engine and if anything goes wrong, we'll see how to fix that later. That's what it's all about when working on an old Puch mopeds.



common problems and solutions

Here we will discuss some common issues and how to solve them. If you have an issue that needs to be solved, send us an email to thomas@puch-mopeds.com