Head Service: jfabmotorsports.com

[jfabmotorsports.com]

JFABMOTORSPORTS head mod service: Mill, reshape, cc, dome work...ect. Work can be done to your specs or ours, just tell use what you need. All heads will be cleaned and surfaced and ready for installation.

Basic: Mill, polish dome and recut squish band...$125.00 + Shipping

Prices are for work done to your head (89-04)
Contact us for additional work and prices.

JFABMOTORSPORTS
2880 Jackson Rd.
Wentzville, MO  63385
U.S.A.
jerrysfab@centurytel.net

Jerry requests you contact him Via Phone at the shop to discuss any services 636-673-7102

[stewart]

that looks like a very nice job ...glad to see you offering this service

[Enginerd]

JFABMOTORSPORTS head mod service: Mill, reshape, cc, dome work...ect.

Jerry,

Can you still run premium pump gas after these head mods, or is race gas or a race/pump blend required?   

Thanks,
Gary

[jfabmotorsports.com]

I think that you are pushing your luck running anything less than 93 octain pump gas in a 2 stroke. If you do any noticable amout of work to raise the compression ratio I think you should run a higher octain fuel. There is a whole debate going on now in this forum on the subject. Riding style also plays a huge part. Low rpm and high load are an engines worst enemy and that is how the KX500 gets ridden in most cases...as I have seen.
   

[blueoval]

jfab, my kx500 is stock.  Our pumps only have 91 octane.  I can get VP 116 locally.  If I mixed the VP with pump 91 how much would you recommend of VP to go with one gallon?  Maybe just a splash?  thx

[jfabmotorsports.com]

Fresh out of my very own 1986 kx500-B2 manual, bought the bike new, sold the bike and kept the manual.
    "Use premium gasoline with an octane rating equal to or higher than that shown in  the table:
 
                                             Antiknock index (RON+MON)/2  min rating....90
                                             Research Octane NO. (RON)     min rating....95

I also have a 1989 KX500-e1 manual that reads the same.

91-93 give or take I have run both. I still like the "pushing you luck" statement.

JFAB

[RoostDaddy]

jfab, my kx500 is stock.  Our pumps only have 91 octane.  I can get VP 116 locally.  If I mixed the VP with pump 91 how much would you recommend of VP to go with one gallon?  Maybe just a splash?  thx

my opinion is if your running a stock head, pump gas is enough.  But, if you were to modify the head and increase compression then you would need race fuel.  If for some reason you feel you need it now, I'd only run VP's Red or 110.  any more and you'd probably be just pi$$ing away money.
just my .02

[kwakman]

can you do an 86 head with squish set for top end jerry?

[jfabmotorsports.com]

can you do an 86 head with squish set for top end jerry?

Yes. My fixture is drilled for both early and late heads. Ship it to me with a note telling me what you want, with your address and phone number.