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Jetting suggestions 06 fxst big bore...step in KEN

Discussion in 'Motorcycle Tech Talk' started by mckittrick87, Mar 2, 2010.

  1. mckittrick87

    mckittrick87 New Member

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    ok i have a 06 fxst...vance hines long shots, arlen ness stage II kit, port polished heads, cosmetics .0030 gasket, 95'' big bore wiesco 10:5:1 forged..big bore being installed in a couple days...screamin eagle coil..screamin eagle 203 cam....i need suggestions on what jets to play around with currently running a 48 195 ...with stock bore kieth black dome top forged 10:5:1 i seem rich, i dont git it...ps pistons has less then 100 miles and will be for sale


    but like i was saying i need to find out what jetting to play around with so i can git miles on the engine before being dynoed dont want to be running lean
    feel free to step in o holly father...KEN lol
    mckittrick87, Mar 2, 2010
    #1
  3. kenfuzed

    kenfuzed Administrator Staff Member

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    I would start with the same jets (48/195) and adjust the mixture screw. My previous bike I rebuilt from an 88" to a 95" and settled on the 48/195 combination.

    One word of caution, be careful not to go too high on the comp ratio if you don't have access to high grade 92+ gas. Here in California we can only get 91 octane and when I built my bike with a ratio over 10.5:1 the bike pinged and had a hard time starting. I changed out the thinner head gasket for a standard which lowered my compression and this allowed me to run on the 91 pump gas and improved starting without having to resort to compression releases.
    kenfuzed, Mar 3, 2010
    #2
  4. hotroadking

    hotroadking Super Moderator Staff Member

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    Check compression on both cyl, I think this will be high and prone to detonation as well
    as hard starting when hot, you'll need compression releases more than likely on hot restarts.

    I would go 204, andrews 37B, woods 6 or woods 5
    hotroadking, Mar 3, 2010
    #3
  5. mckittrick87

    mckittrick87 New Member

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    well the bike has comrpession releases and the gasket kit im going to use for the big bore will not be a cosmetic!!! its a james miced .0040 and far as gas 93 octane i pretty common here i didnt know u guys had problems like that in cali i know the emisions are tough i guess it makes sence

    gaskets came usps today...hope the big bore comes in .....snail mail beat ups!!!
    mckittrick87, Mar 3, 2010
    #4
  6. kenfuzed

    kenfuzed Administrator Staff Member

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    I've used both James and Cometic and have had good results with both. Keep us updated on your project.
    kenfuzed, Mar 3, 2010
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  7. mckittrick87

    mckittrick87 New Member

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    ok theres a friend of ours that used a 203, 10:5:1 pistons forged dont know the name brand and .0030 gasket.. 200lbs per cylinder...i went to the shop with the question
    mckittrick87, Mar 3, 2010
    #6

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