Maintenance & Technical > KX450F / KX250F

2014 kx450 engine noise

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radodge:
I have a 2014 kx450f. I'm having a gurgling noise when idling I can't really hear it when riding runs good and cranks on 2 or 3 kick when cold. I have just put a new cylinder and piston and rings in. I checked all my clearances when I put it together like valves and cylinder and piston size and ring gap and I also staggered the rings like the manual says. I also took the flywheel off and cleaned the screen it was pretty dirty this is the first time I have done this I just got this bike about 2 months ago. The reason I replaced the piston and cylinder is due to scaring on piston and cylinder when I took it apart to replace the base gasket on cylinder due to water leak when I bought the bike then discovered when I got inside I had the scaring on the piston and cylinder so I went ahead and replaced. I'm at a loss on this gurgling noise looking for some advice please.

umberto:
Welcome to the site radodge.  We have a lot of knowledge on the site, but unfortunately a lot of us tend to stick to our old trusty two strokes.  There are guys on the site that are very good with four strokes, but you may have to wait just a bit longer to get a response.  If you don't get a response for a while, post an update to your thread so your question goes to the top of the list again.

KXDINO:
with out hearing it for my self it hard to tell , if you can pin point were it coming from would be good , try a stethoscope . is the water pump working right , radiators fittings all tight , r cap sealing good, not overheating , check head for straightness and cracks , were was it leaking before ? what sought of scaring did the piston have and why did it have the scaring ? did it over heat badly before you change the piston ? is the coolant level dropping on a long ride , it most likely going in the combustion chamber which will make the ring lands break , if that the case , take it apart and check everything with a fine tooth comb.

radodge:
Thanks for the replies.  It was scared on the exhaust side since I have had it there had been no overheating. I did try a stethoscope but had no luck at pinpointing anything. The gasket leak was around where the water comes in at the base of the cylinder and crankcase. No coolant level drop. I'm just at a loss. I guess my next step is to tear it back down and check everything again.

motorman455:
Could it be the main bearings? Especially if water got into the lower end.  I had a heavily modified ktm 525 at one time and destroyed the mains. Luckily I heard a whirring sound and it was vibrating more than normal so I shut it down before catastrophic failure. Once I tore it down and spun the rod and crack around by hand, I could feel it wasn't right and had to rebuild the crank and replace the main bearings.

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