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Message: [QUOTE="leonard1, post: 1290836, member: 83383"] Just, done a stack of mods to my 99 kdx 200 and have some issues. Firstly it goes unbelieveable well and the power increase over stock is amazing, but there are two problems: 1. Bubbles coming out through the radiator which I expect means my head gasket is leaking. 2. At hight revs on WOT she makes a repeated snapping wip cracking type noise, not the ball bearing or hammer on metal sound that people refer to when describing pinging and as I have never heard pinging apart from in a car I am not sure what it is. The mods I have done all in one hit are as follows: New Wiseco piston and rings Rejetted to 155 main and needle in middle position. Boysen Reeds 0.7 mm taken straight off the head with no other changes bringing the squish clearance down from stock of 1.8 to 1.1 mm. Airbox opened up FMF rev pipe. I am running 98 octane pump fuel but it looks like I have overdone the compression. Using a guage I have tested the cranking pressure at 1300 kpa (190 psi). Was about 1000 kpa(145 psi) I am not suprised if it is pinging but the noise just doesn't sound like what is described by others. Could it be the sound of the gases escaping thru the head gasket? any thoughts? [/QUOTE]