popping sound

denis the menace · Jan 31, 2009

Hi Guys
Done my timing belt and the engine fires up, although when running there is a constant poppng coming from the snorkal. Now is this just the timing out or valve damage or a bit of both.

boydy1989 · Jan 31, 2009

valve clearance.

take the cover off and check them.

hollie · Jan 31, 2009

if the tappets were ok before then they should be ok after!!! (enless you adjusted them at the same time as doing the cam belt!!!!)

boydy1989 · Jan 31, 2009

didn his belt snap? i may be wrong though.

mine made that noise when one of the valve caps had fallen off somewhere.

denis the menace · Feb 1, 2009

Thanks guys
Now ive taken the cover off adjusted tapets and no 4 was well out put it all back together again and the noise is still there so I done it all again and guess what the noise is still there. could it be the timing out on the belt.

mysteryman · Feb 1, 2009

Yes - defo

denis the menace · Feb 1, 2009

looks like doing my timing belt again then ay had trouble lining up the marks they did look lined up though.

denis the menace · Feb 1, 2009

now would it be the belt 1 notch out or 180 degrees out.

mysteryman · Feb 1, 2009

Others may correct me, but I dont think a motor will run 180 degs out. Be VERY careful tho cus u can easliy do some serious damage here

boydy1989 · Feb 1, 2009

i had this argument a while ago. Its not possible to get a 4 stroke engine '180 degrees' out. Itll be one tooth out on the cam shaft, takes an hour or two to correct it.

mysteryman · Feb 1, 2009

Tis possible - done it when I put a new short motor in. Put the HT leads or Dizzy cap (cant remember which) back on wrong - right sequence of firing strokes just the wrong stroke (ie there are four strokes in the sequence). Wouldnt start but popped like buggery when I towed it for miles trying to bump it.

boydy1989 · Feb 1, 2009

mysteryman said:
Tis possible - done it when I put a new short motor in. Put the HT leads or Dizzy cap (cant remember which) back on wrong - right sequence of firing strokes just the wrong stroke (ie there are four strokes in the sequence). Wouldnt start but popped like buggery when I towed it for miles trying to bump it.

nah see thats different again - what he means above is that the valves are 180 degrees out wrt the pistons, but if the marks are lined up that aint gonna happen.

With yours you had the valves in time with the pistons, but the spark was happennin on the end of the exhaust stroke, so the valves weren't in synch with the ignition. This aint possible with a dooseil.

mysteryman · Feb 1, 2009

Ooops. Thought someone said it was a four stroke. Confused now - will shut up

boydy1989 · Feb 1, 2009

yeha it is...

Four stroke.
Meaning...
Induction
Compression
Ignition
Exhaust

4 strokes of the pistons = one full power cycle. Not Four star, as in Leaded Petrol.

A 2 stroke only has, uh, 2 strokes to each cycle, i.e. a wee moped etc.

mysteryman · Feb 1, 2009

Ha Boydy!!
Suck Squeeze Bang Blow - like I said.

boydy1989 · Feb 1, 2009

too right!

But still, you cant get it out of phase like you said though.

And no i can't b arsed drawing the pictures to show you how again either

mysteryman · Feb 1, 2009

Well I did! Gonna have a think now ow I did it. Sure I just moved the HT leads round but it was a long time ago so.............I know it started first flick of the key after I'd done it tho.

popping sound

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