2 stroke engine advice please

Hi,

Some thieving scum nicked my old faithful KMX125. It got recovered
20mins
later having had a bit of a crash in a park (I hope they broke their
neck).
Anyway, it now wont start and I can't work out why.

The electrics seem intact and there is a healthy spark. There is
definitely
fuel in it. When I kick it over it doesn't fire, but then occasionally
will
backfire (especially when holding the throttle open.)

Any ideas?

I've no idea how they 'hot wired' it. They had disconnected the
ignition
barrel at the first connector, but there was no improvised
connections
there. And becasue the spark seems fine, I'm assuming it's not
electrical.

Would it lying on it's side for a while have done anything relevent?
Has it
been left on it's side reving it's nuts off after the crash? When I
put my
thumb over the spark plug hole and kick it over, the compression
doesn't
seem consistant in a reassuring way, but I've no idea what normal is.

Help!

Cheers
Steve

 

A couple of possibilities...

Crankcase might be a bit too wet with neat petrol if the carb allowed it
to happen in that position. Check if the plug's wet when you kick it
over.

If it was, as you suspect, left revving its nuts off on its side, the
crankcase seals could be shagged.

 

We have this problem when students drop the training bikes. It's usually the
plug.

 

We used to have this problem every time the clumsy **** riders dropped
the race bike.

It was always the carbs that just needed stripping, blowing through
and a bit of very hurried TLC.

 

Good job that only happened rarely, eh?

What?

Oh...

 

Move to a less pikey area. HTH.

 

Hmm... I dont remember the plug being wet (I was trying to start it 5
days after it had been stood upright again)

How do I investigate this possibility? I'm not familiar with crankcase
seals. Are these the seals on the main crank bearings?

Somebody else has suggested that the carb jets may be full of crap, so
I should remove and clean out the carb. Does this sound reasonable use
of a few hours?

Ta so far!
Steve

 

Yes, certainly if there is nothing bent on it that's likely to be
interfering with the electrics, the carb is where to look but forget
kicking it over - tow it up and down with another bike (or car) to fart
it through and *make it* pick up!

Oh and clean the plug anyway - it's 2 stroke, ain't it?

 

We have this problem when students drop the training bikes. It's usually the

Would this still apply even after being stood for 5 days? (err
recalculation... 3 days)

It hasn't had a new plug for ?8 years and 5000 hard miles so I may
splash out and treat it to a new one. (I'm just crazy like that...)

Is there a way to 'dry the cylinder'?

Ta
Steve

 

It was always the carbs that just needed stripping, blowing through

Ah, cool. That answers my earlier question. Sorry, I'm temporarily
using Google as my newsreader and it's supplying me with replies in a
seemingly random and secretive way!

Steve

 

It is a stroker, the first and usually the last point of call for any
fault finding procedure is *always* the plug.

Turning the engine over once or twice without the plug in is enough and
you have done this all ready.

 

Move to a less pikey area. HTH.Or more accurately, don't lend your spare bike to a mate who lives in
a pikey area.

It's lucky for us though that pikeys aren't allowed to come to our
fabulously posh areas... The gatekeeper sends them away.

 

Stevie wrote

It's gatekeepers in white coats with ETC leads dangling from pockets,
round here. (dribble)

 

And so on?

 

Grimly Curmudgeon wrote

Um yes er indeedy.