Athena 144 YZ Big Bore Installation PART 2.wmv

Installation of an Athena 144 Big Bore kit on a YZ 125 2 stroke

Category:

Autos & Vehicles

Tags:

• 144
• Athena
• motocross
• big
• bore
• 125
• top
• end
• rebuild
• mx
• YZ
• works
• Pro
• circuit

[yz125rider194]

what jeting u runnin and what needle position and air screw setting

[banfordg]

@yz125rider194

Running 430 main, 27.5 Pilot and 6BEG9-69 needle 2nd rung from the bottom in a Mikuni flat sided 38 carb with a boyesen Rad cage and a works Pro Circuit pipe. From memory, the air screw's around 2.25 turns.

[ReconSurfer]

hey ive got a yz 125 2006 and im going to attempt a top end rebuild but just wondering what do i need to replace it has'nt had any work done since i got it (about a year) is it just the piston i need to replace?thanks

[banfordg]

@ReconSurfer

How does it run? if you're having problems (not running clean, rough idle, poor starting) then it may be time for e top end, but before you tear down run a compression test to confirm that it is time to re-build. All of the above symptoms can be caused by carburation issues, especially if the bike's been lying for a while. If you do have to re-build the top end you won't know what needs replaced until you open it up. You may need just a top end kit (piston/ring/bearing/gasket).

[jasonmccoll]

Sweet! Is it a Husky with a YZ engine.I love that pipe and Athena kit 5 stars bro !

[banfordg]

@jasonmccoll yeh, I guess you could call it a 'YZSKY' lol. The Athena kit makes a huge difference by the way, you should consider it when the wife's RM needs a new top end!

[crf150r99f]

what did u put in the engine so nothing will get in

[yz125rider194]

thank you very much helped me out alotttt!!

[dexter2433]

@banfordg you are correct it is solder wire maid out of tin and is real soft like lead but no one like to handle lead any more so they recommended tin wire

but you do not want to use silver solder it is allot harder cold and may damage the piston or head

[gilessmokey]

i carefully fitted an athena kit to 05 yz a couple of years ago and could not seal the cylinder head for long. the two piece athena head is a poorley supported and a flimsy affair and the o ring would blow between the studs.i ended up machining the yamaha head and using that .porting on athena is not brilliant. where bore is larger it has dropped ports lower especially rear transfer which don`t line up. i was wondering how others have got along with athena,is the head still two piece?