who does great port and polish jobs ?

[honda250r86]

im currently thinking of port and polishing my 86 250r with .050 over bored esr full exhaust, 38mm airstrike , esr reed cage with spacer

i wanted more mid to top end more but specially the top end more which person or company would you guys recommend for porting a stock cylinder ?

and right now my 250r push180-190 psi if i place a cr 250r head gasket would i need to run 50/50 race fuel ?

[yaegerb]

In no particular order, Jason hall, Jerry hall, Arlen Lehman, Rob Selvy.

[barnett468]

COMPRESSION VS FUEL TYPE

If you leave it as is and install a CR head gasket, I think you would be extremely lucky if you didn't have to use race fuel . Depending on the extent of the porting, you may or may not need to use race fuel if you use a CR head gasket but since they are easy to change, you can simply get one and try it.

You can also mix race fuel with gas but you are better off using straight race fuel if you go that route then tune your bike to get the maximum benefit from the fuel you are using . The higher the octane the fuel is, the more compression you can run . The more compression you run, the more power you can make etc . The lower octane race fuels are sometimes less expensive than the higher octane ones . If you have access to E85, that will be your cheapest route and you can run a lot of compression with that but it can accumulate water so just store the bike and gas where they won't get extremely cold and don't keep it for more than 3 months and you shouldn't have any problems.

Another alternative to racing fuel and E85 is to buy real lead additive . It is called Octane Supreme, however, this does not add additional cooling like race fuel and E85 does . If you increase your kicking compression to around 200 psi, I would run 91 octane then ad 2 oz per gallon . At $40.00 per quart, it costs $1.25 per ounce so this would increase your gas cost by $2.50. which is still far cheaper than race gas.

OCTANE SUPREME

http://www.wildbillscorvette.com/octanesupreme01a.htm

http://www.ebay.com/itm/like/3613136...&ul_noapp=true


VP RACING FUELS

http://www.vpracingfuels.com/page469672.html

http://www.vpracingfuels.com/master-fuels-table

http://www.vpracingfuels.com/racing-fuel


IGNITION TIMING

Also, the more compression you have, the less ignition advance you can run . You can change your timing to see what works best in your particular case, however, you need to install an adjustable timing setup to do that . Don't run it at max rpm for more than a second or too and then check the spark plug to determine timing and jetting . You can EASILY damage your piston if you run incorrect timing for very long.

ESR ADJUSTABLE TIMING PLATE

http://www.eddie-sanders-racing.com/...%20adapter.htm


SPARK PLUG

With your current level of compression, I would try a plug that is 1 step colder than stock . I also would not run a fine wire type plug . The colder plug will allow you to run slightly higher compression or slightly more timing.


CYLINDER PORTING

You can have your cylinder ported for different apps, so just tell the person doing the work what you want and they can do that for you.
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