YOU with the YZ144


37 replies to this topic
  • whips

Posted October 29, 2009 - 11:04 AM

#21

out of interest what gearing are you guys with 144 kits running


im running stock,13/48 but seen people run 14/48 14/50

  • MJP68

Posted October 29, 2009 - 07:30 PM

#22

out of interest what gearing are you guys with 144 kits running


It depends on the track, Im running a 13/47 right now but I know the engine will easily pull higher gearing for faster tracks.

  • MAD4MX

Posted November 23, 2009 - 02:23 PM

#23

Beware of running the leaner jets in the UK- I wrecked countless pistons and fine wire plugs when I fitted a VHM YZ144 head with a slightly domed Wiseco 58mm piston / FMF Fatty with FMF shorty- The exhaust combo works well with the 144 kit but I do run the one setting richer needle than std. and anything between a 460-500 main in the winter on the sand- Without 98/99 octane fuel she will detonate- be careful , be prepared to check jetting often once out to 144cc

  • qwert321

Posted November 23, 2009 - 09:49 PM

#24

Can someone tell me why in uk they have to run 460-500 main and i use 370 main and could go leaner when it warms up over 20 Celsius/about 70 Fahrenheit?

  • whips

Posted November 24, 2009 - 12:36 AM

#25

im running a athena kit and stock jetting is perfect,410 main,40 pilot,have gone 2 clips leaner on the needle,from 4 to 2,have had it checked but the local tuning guru and he agreed that its perfect,conditions here are 15-25 degrees celcius and 0-100 meters sea level,(in New Zealand)
the tuner also said run 30% race feul with 98 pump gas,(aviation fuel for me as my girlfriend works at a airfield.sweet)

Edited by whips, November 25, 2009 - 10:22 AM.


  • mac132

Posted December 25, 2009 - 03:11 AM

#26

ok guys it crunch time and i need your help :cheers:

i am doing the winter rebuild and now would be the time to do the 144 conversion so what i am asking is

is the conversion worth the cash it going to set me back in the region of £ 700 / £900 uk pounds and a dont want to spend that kind of cash and be disapointed if u know what i mean !
or should a just srend some of the cash on tuning the 125 engine with a pipe v froce and vortex ignition pack ?

help and advice is needed guys :moon:

  • BRM

Posted December 25, 2009 - 04:29 PM

#27

ok guys it crunch time and i need your help :cheers:

i am doing the winter rebuild and now would be the time to do the 144 conversion so what i am asking is

is the conversion worth the cash it going to set me back in the region of £ 700 / £900 uk pounds and a dont want to spend that kind of cash and be disapointed if u know what i mean !
or should a just srend some of the cash on tuning the 125 engine with a pipe v froce and vortex ignition pack ?

help and advice is needed guys :moon:


Have a look at Eric Gore's web site. He has some really good deals which will not cost anywhere near that.

  • mac132

Posted December 26, 2009 - 05:10 AM

#28

any one els got an oppinion

  • DMauro

Posted December 26, 2009 - 07:36 AM

#29

i just did an eric gorr yz 144 for my friends son. it was under $500 with pston and gaskets. as far as porting he basiclly just modified the exhaust port. i only got to rie it up and down a field to jet, but i liked it made me want one. the price is good and its basic so you dont run into problems with exotic type motors.

  • mac132

Posted December 26, 2009 - 09:17 AM

#30

update , i have sourced a second hand athena 144 one which uses the new style head gasket kit with 30 mins light use for £200 uk pounds are the athena kits any good ?

  • DMauro

Posted December 26, 2009 - 10:01 AM

#31

do a search i saw some reviews.

  • mac132

Posted December 26, 2009 - 12:58 PM

#32

do a search i saw some reviews.

cheers dmauro interesting readings thanks:thumbsup:

  • mac132

Posted December 31, 2009 - 09:21 AM

#33

well it arrivd today the athena 144 kit , second hand but very light use and wilt all the gaskets and a piston too , will be starting the projct 144 thread after the new year with lots of pics and write ups :moon:

  • MAD4MX

Posted January 03, 2010 - 02:02 PM

#34

We ran an EG144 kit here in the uk , had many problems with detonation once the weather got colder and low altitude tracks, deep sand / wood chip. In the end we were running one step richer needle , used a 500 size main jet on the beach , still didn't 4 stroke !. Found that a FMF Fatty exhaust and FMF silencer worked well on the 144 , except it promoted the detonation. Haven't had experience of the Athena kit , heard some good things, some negative- good luck- We loved the YZ with the 144 kit , got 33 bhp at the back wheel on a dyno , when it was running a bit rich- compared to the dyno testers 125 it had 3-4 bhp more between 6-9000 rpm , same bhp figures at peak though. Just wasn't reliable once I fitted a VHM head , FMF Fatty pipe- approx 3 hrs per piston at best- Using Avgas helped even though the VHM head was supposed to run on Super Unleaded. Good Luck

  • mac132

Posted January 03, 2010 - 02:21 PM

#35

cheers for the info m8 :thumbsup:i am expecting lots of time to be spent on jetting and setting things up the guy who sold me the kit was running jetting all standard except a 480 main so it just a case of trying things out , im just the pilot my good friend at tote motorsport is the 2 stroke wizard :moon:

  • gregiow

Posted January 30, 2010 - 10:43 AM

#36

hi mac 132, im about to do the athena 144 to my 2006 yz let me know how it goes i plan on using my HGS pipe (125cc) v-force 45pilot 470 main 3rd clip and see how it goes hoping to try it in half term (mid feb) let me know if you have any tips thanks greg

  • mac132

Posted February 06, 2010 - 09:58 AM

#37

hi mac 132, im about to do the athena 144 to my 2006 yz let me know how it goes i plan on using my HGS pipe (125cc) v-force 45pilot 470 main 3rd clip and see how it goes hoping to try it in half term (mid feb) let me know if you have any tips thanks greg


hi there just finished rebuilding engine and should be fitting it this weekend m8 i am running a doma front pipe bud tail pipe , v force 3 block and will be starting at a 480 main one clip richer and standard pilot, prob be a bit rich but will lean it down if required , i cannot wait to see the results and will post up as soon as its been out cheers :ride:

  • YZ144 GUY

Posted August 03, 2010 - 08:56 PM

#38

Dont be afraid to try smaller main jets. I would put money on the fact that it would pull hard all of the way through the rpm range. I started with a 440 Main and the bike ran fine, but the powerband did not pull very far. I worked my way down to a 390 and the powerband is great. Very dramatic difference that a $5 jet makes. I do run 50/50 race/pump mix.

07 Eric Gorr YZ144
37.5/390
PC Pipe and Shorty
750'





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