Fuel getting to carb but not cylinder?

[skatefreak]

Evening all.
Came across a a strange issue today.
I was looking at a ped for a friend, a 2013 Pesaro 50 replica.
He filled up at a petrol station and after about a mile the bike cut out.
He is sure it was petrol, they have drained/replaced it with fresh fuel and no joy.
I have checked the carb, defiantly fuel getting to it, cleaned out the jets, they are defiantly clear and the spark plug is getting a strong blue spark and there is plenty of 2 stroke oil.

No matter how much the engine is cranked however the spark plug seems to be dry as a bone.

Any thoughts on what may be stopping fuel getting from the carb to the cylinder?

Without taking it apart more I cannot see if there is anything more between the two however I wouldn't expect there to be.

Any thoughts would be very much appreciated..

Best regards.

-Jvr

[CestrianX]

How sure are you that it was petrol?

Have you dismantled any part of the bike?

Need more info

[Ariel Badger]

Does it have any compression?
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[skatefreak]

All I've taken off is the bottom fairing, air box and carb.
When turning over there was air flow through the engine as I put my hand behind the exhaust and felt it.
No smell of fuel from the exhaust though.

As for compression, I will have to go over with my compression tester later to be sure.

I am pretty confident it was petrol and not diesel however if it was, the carb has been cleaned out and and its still not getting any petrol through.

Interestingly, even with a strong spark the engine wouldn't fire up using carb cleaner (substitute for easy start).

I really think I'm missing something here as there is defiantly fuel getting to the carb, the jets are clear, no restricted air flow and there is a good spark.

It does only really leave compression however I would expect to at least smell fuel/wet plug after cranking for a while with no ignition but not even that's happening.

One last thing to mention, for a little while apparently the bike has been reving up to roughly 6,000 rpm of its own accord. It has an auto choke however if this was faulty I would be surprised if it kicked the rev's up this high...

Strange one this.

Cheers for the input guys.

Best regards

-Jvr

[biker_bob]

I don't know the bike but has it got reed valves or any other kind of valve in there? YPVS is one other that I remember.

Normally sits between the cab and cylinder.

I'm presuming it a 2 stroke.

[skatefreak]

sorry.
Yep its 2 smoke.
Its been shipped off to the dealers, was only told its still under warrantee after I had a butchers heh.

Will wait on them to find out what it was as its a pretty curious issue...

A note on the reed valves though, as possibility if they were broken and letting the crank case pressure back out through the carb however I would still expect the engine to fire...

I am starting to wonder if it really could be compression on a 13 plate

Best regards.

-Jvr