2 stroke not starting

[tigertim20]

have a slight issue.
Bik just had new top end, and has been run three or four times since the rebuild - each time only for about 5-10 minutes.
The other day I put an hour meter on it, and fired it up, no problems.

Next day, I wanted to take it out. I fired it up without an issue, and let it warm up, it was warming up fine for about 5 minutes or so, and as i was walking towards it to get on it, it died and wouldnt start.

I have tried removing the spark plug and kicking it over in case it was flooded,
checked the plug (which was new with the rebuild) and it is clean
spark is a strong blue spark
pulled carbs apart and cleaned and rechecked float height

still wont start

tried whipping the plug out and throwing some fuel down the hole and plug back in and kicking it over, - no go

just pushed it to the top of a big hill and tried to bump start it coming down, to no avail.
The best I managed coming down the hill was it would fire once every 10 or 12 revolutions.

what am i missing here?

1991 CR 125

[meteor]

If it's just died after starting and running ok, have you looked at fuel (old/dirty), fuel tap, fuel line over oiled filter maybe...

[tigertim20]

If it's just died after starting and running ok, have you looked at fuel (old/dirty), fuel tap, fuel line over oiled filter maybe...

have checked fuel, its only been in the tank a week, maybe two

[nzspokes]

If it's just died after starting and running ok, have you looked at fuel (old/dirty), fuel tap, fuel line over oiled filter maybe...

With putting fuel down the plug it would have fired for a sec if that was it.

Compression feels the same?

[tigertim20]

With putting fuel down the plug it would have fired for a sec if that was it.

Compression feels the same?

yes feels the same

[F5 Dave]

Oh good grief, change the friggin plug.

They can spark on the outside of the engine but not run when in.

MX bikes don't like to idle & likely it is jetted rich & just fouled the plug.

[FJRider]

Can the timing be altered ... ??? Sounds like a timing issue.

Does it have points ... advanced/retarded ???

[Fast Eddie]

if its def getting good air and good fuel. in the right amounts, and its compressing it - then id guess check the spark again, its easier for the plug to make a good spark outside of the cylinder with no compression/air and fuel going on..

maybe check some resistances of lead, the ign coil.. anything ign related?

bummer man - no starts are a fuckn pain - one of those things your just going to have to go through things one by one.

[F5 Dave]

Can the timing be altered ... ??? Sounds like a timing bissue.

Does it have points ... advanced/retarded ???

And clearly with all due respect you have no clue. No & No.

[ac3_snow]

I spent ages last sunday messing with alsorts of things trying to get my two stroke to run, in the end the spark plug gap was too big.

[tigertim20]

Oh good grief, change the friggin plug.

They can spark on the outside of the engine but not run when in.

MX bikes don't like to idle & likely it is jetted rich & just fouled the plug.

would this really be necessary on a plug that has had at most 20 minutes of running time from new, and is still clean?
I will try get another plug tomorrow to try on it, I just want to check that its not something simple and silly Ive missed that takes a few minutes, rather than spend coin on it.

I read that sometime hour meters can cause issues with spark, so I have disconnected that, and still no go.
I will much around with it and double check everything else is as it should be before I spend money on plugs

[Mom]

New plug required. Check the gap too.

[bogan]

Have you run the top end in properly? (is that what the three or four startings were)

Fouling plugs is generally symptomatic of another simple issue (like shitty tight pine forest trails ), but you gotta put a new plug in to find the simple issue!

[Mungatoke Mad]

what am i missing here?

A 4 STROKE

[tigertim20]

Have you run the top end in properly? (is that what the three or four startings were)

Fouling plugs is generally symptomatic of another simple issue (like shitty tight pine forest trails ), but you gotta put a new plug in to find the simple issue!

yeah, thats what the startings were.
I asked because the shops are closed so I cant go buy a new plug right now, what I CAN do right now though, is tinker, so thought it was worth asking if id overlooked anything else I could fix, seems the general consensus is no, it will just be the plug, so now I have to sit, wait, and twiddle my thumbs until tomorrow after work!