KTM 505 SX-F help

[Mike_505_SXF]

Hey there I was looking for some Help / Insight on my bike.
I was out riding over the May long and after following up some junior riders (and riding quite slow) my bike heated up and when I went to take off it stalled out...not a seize but a stall and I couldn't get it going after a long cool down.
I pulled the plug and had very minimal compression and when I held my hand over the exhaust it would push and suck
I pulled the head off and can see the cams all turning well. I proceeded to pop the exhaust off and could see the valves all running well.

Right after turning the bike over I can hear a gargling from the exhaust valve area?

I don't know what this could be I would guess a cracked ring or some timing/valve issue.

Any Ideas as to what this could be?
Also and shops/mechanics you could recommend in the stony plain / Edmonton area


Thanks a bunch,
Mike

 

[willjeffwilljeff]

Have u put a new plug in it, does it run now?

 

[slomo]

sounds like and exhaust valve stuck open or burnt up not sealing which will cause exactly what you just mentioned,low compression,sucking through exhaust

 

[synergycycle]

its definatly the hydrolic cam chain tentioner. all ktms have this problem.

 

[willjeffwilljeff]

its definatly the hydrolic cam chain tentioner. all ktms have this problem.

Hows the cam timing chain tensioner the problem?

 

[suzuki_ryder]

It's defiantly not your cam chain tensioner. If it was it would have skipped a tooth and you would have had valve contact and wouldn't kick over. You will have low compression because there is a decompressor on the exhaust cam that retracts after 250 rpm to help in easy starting (Try to kick over a YZ426 or early YZ250F, it's not fun) The gargling you are hearing is the piston doing it's stoke in the cylinder.

Chances are is just a spark plug. Try replacing it.