KX 500 Flat on Mid and top end

[motopunk]

Copy that motopunk. Thank you for all your help as well! Its blizzarding here as we speak, perfect timing to figure this bike out! I hate it when the bike is down and the day is perfect for riding!

you can keep all that white stuff. 

The magnificent white flies around outside  ... The winter is the best time to rebuild a bike ... 

[lsampson]

The Cylinder Measures 3.386", Which Is Right On According To Spec. I'm Satisfied. I'll Just Throw the Wiseco Piston Back In With The New Exhaust Valves And Be Done With It. Thanks For All The Help. I Was Probably Measuring The Pistons Wrong And The Rattle Is Probably Just The Exhaust Valves.

[Motorrad]

The Cylinder Measures 3.386", Which Is Right On According To Spec. I'm Satisfied. I'll Just Throw the Wiseco Piston Back In With The New Exhaust Valves And Be Done With It. Thanks For All The Help. I Was Probably Measuring The Pistons Wrong And The Rattle Is Probably Just The Exhaust Valves.

as it was.  with the other calculations. you were only off by .001"     which is easy to blow somewhere without the right tools...

even if it was .001" big..   id run it.

[lsampson]

Yep. I Need To Invest In More Tools! Better SafE Than Sorry I Guess. Thanks Again Motorrad, And If You ArE Up This Way Again, Look Me Up!

[Motorrad]

Yep. I Need To Invest In More Tools! Better SafE Than Sorry I Guess. Thanks Again Motorrad, And If You ArE Up This Way Again, Look Me Up!

now....

lets get even more in depth.


what brand base gasket you running?

[lsampson]

  Cometic..

[Motorrad]

Cometic..

do you see a differance between the one in the lower left corner..   and the rest of them (ones I custom order)?

[lsampson]

Yep, Smaller Holes For Exhaust Drum Valves!

[Motorrad]

Yep, Smaller Holes For Exhaust Drum Valves!

Yep...    guess what that does...   (look at the title of this thread) 



have you read my motor build thread?   more info than you ever wanted to know on kips shim'n in there..

[lsampson]

I Assume It Quiets Things (Exhaust Valves) Down! How Can I Get To Your Build Thread? I Tried To See Another Build ThreadThe Other Day But Was Having A Hard Time Finding It...

[Motorrad]

I Assume It Quiets Things (Exhaust Valves) Down! How Can I Get To Your Build Thread? I Tried To See Another Build ThreadThe Other Day But Was Having A Hard Time Finding It...

(with a off the shelf cometic gasket and no shims, you are losing 1.5mm of exaust timing!!)


Ill dig up links for ya...

[lsampson]

Right On! Thanks Man! Are There Links To Buy The SHims And Custom GaSkets, Or Can I Buy Them From You?

[Motorrad]

Right On! Thanks Man! Are There Links To Buy The SHims And Custom GaSkets, Or Can I Buy Them From You?

Alward25 can get you set up on gaskets.


I used to use shims (as you will see in my thread).    but have actually started just cutting circles out of old Cometic gaskets I have around to shim with.   as I have found them to be pretty darn close.   (for example.  my motor right now..   has 1 .020" cutout on one side, and 2 .020" cutouts on the other side..  to make everything happy.

but my drums, base gasket stack,  and just about everything else is NOT STOCK.



in USMC500's motor   it took just one extra cutout per side.

[lsampson]

I Will Understand More When I Read The Thread, But I Suspect The Shims Go At The BaSe Of The Drum Valves, Where They Rest In The Cylinder, And Move Them Down To Open Up The Center Valve More?

[Motorrad]

I Will Understand More When I Read The Thread, But I Suspect The Shims Go At The BaSe Of The Drum Valves, Where They Rest In The Cylinder, And Move Them Down To Open Up The Center Valve More?

they go between the base gasket, and the alum piece's   to raise it all up