How hard is it to change the rear bearing to a ceramic bearing.

The stock JX21 rear bearing is in the case very tight. I use the oven at 450 for 10 minutes to get it to fall out. Reheat and drop a cold new bearing with the crank in.

Put an EBMODS button in my old almost worn out 7-gallon JX and ran it this weekend..........all I can say is SHWEEEEEEEEET!, more power, more run time. everything.. 3 thumbs up.

NICE! Wait till the New version 2 buttons are available.

version 2???!!!! it can get better???!!!

explain

lol yea! V2 is the new and improved EB Mods head button. The V2 gives more tuning options. I've been running the V2 for a few weeks now, and i've had nothing but great results.
The V2 is available at tonys screws.
http://tonysscrews.com/product.sc?ca...&productId=533

sorry to say...but you suck you lucky sob

It's not really much different then the V1, it just gives more tuning options. With the new V2 there will be instructions on shimming and what fuel percentages to run. I was running the V2 with 20% EB Mods fuel and got 11.5 mins run time in my 6T.

that sounds great man

oh it is!
the New V2 will also benefit guys in High elevation areas. that struggle to make power is over.

jpalessi what pipe and insert are you running? I'm running the jx around 185-195 with 8mm insert, and jp3 with a p6 plug on 30% and getting about 9 mins on a tank. I thought about a 7mm insert, maybe a 14cb and lean her down to about 220 to get a bit more run time cause it's crucial to make 10 min stops. I have a 2050, 086, jp3, 1005 pipes to choose from.

J Bell,
Im running a EB JX with a 8mm stack, 2042 pipe w/ the new mbx6-80 header, P4 plug, EB Mods V2 Button shimmed for 20% EB Fuel.

Jonathan, the smaller stacks really don't help increase run time much, because they kill the power, and cause the driver to use more throttle. So my suggestion to you is go back to a 8mm get a EB Mods V2 Button and some 20% Nitro. That will deff put you in the 10 min pits. You'll prob pick up close to 2 mins. Also if you decide to do this i would run a P4 Plug cause that P6 with the 20% will be really hard to tune, and idle weak. if you have any more questions dont hesitate to ask.
Hope this helps Good Luck!

I would think a P4 for 20% fuel and P5 for 30%. P6 seems a bit cold.

I ran P4's even with the 30% But i'm sure the P5 would work....may just be a little harder to tune a P5. I seen a friend run P6's in his speed and make awesome power and run time, but the tune hasta be spot on or the chances of over heating in a long main is high..
Colder plug = smaller tuning window.
Less Nitro = smaller tuning window

Hi Guys,

Sorry I was off the forums again for a while (this time 9 days....LOL ).
But we did get in the V2 (version 2) EB Mod JX-21 head buttons last week and sold them all out already. But we do have another batch coming in hopefully this Monday or Tuesday.

Like Joe said the V2 EB Mod JX-21 Head Button has a few changes. The performance difference is the same as the V1 when using 30% nitro and shimmed for 30%. The difference is that the V2 uses a 0.2mm (0.008") aluminum shim instead of the 0.1mm (0.004") copper shim for the standard 30% setup.

When going to higher altitudes (above 3500 ft) or 20% nitro fuel you want to lower the deck height. With the V1 head button you could not do that since you were already running the thinnest shim. The only option for high altitudes was to run 40% nitro fuel. With the V2 head button now guys can lower the deck height using the thinner shim.

For guys that want super long run time, they now have the option to run 20% nitro fuel. Also some folks like 20% fuel since it is cheaper. Just remember that using the lower 20% nitro fuel the engine will make slightly less power than when ran on 30%. The head button modification to the squish band helps improve performance and efficiency so to some it will be a nice trade off (this is where Joe falls).

Due to the inconsistencies with nitro fuel percentages when Mfg's make the fuel (just because the label states 30% doesn't mean it's actually 30%) Ed now recommends using a P4 plug with the head button and 30% fuel. For the folks running 25% nitro fuel you can run the P3 plugs. We suggest if you already have P3 plugs and your engine runs well with your 30% fuel and the EB Mod head button installed then by all means use your plugs. Just be sure to take out the plug and get a good read on it. Any signs of detonation then get some P4 plugs.

The new V2 EB Mod JX-21 head buttons can be easily identified from the old or stock head buttons as Ed has machined two spots into the top of the head button for easy identification.

Best regards,