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  1. #1
    Join Date
    Feb 2006
    Location
    MI
    Posts
    1,476

    Default Need Porting and Squish Specs for 87 LT250R

    Anyone willing to list porting specs for both woods and dunes?

    Degrees and duration for intake and exhaust?

    What about channge in port height? (At least I can measure a change in port height to know about what was done)

    Squish band size and angle? cc's of dome?

    I want porting and head re-chambering but I would like to have some idea what I should be hearing from the local motorcycle mechanics. Here in Michigan they are charging $110-120 for either porting or head re- chambering.

  2. #2
    Join Date
    Feb 2006
    Location
    MI
    Posts
    1,476

    Default

    This is all I found so far and its for the 88-92 cylinder porting:

    Exhaust opens at 89 degrees ATDC for a duration of 181 degrees.
    Transfer ports open at 119 degrees ATDC for a duration of 122 degrees.

    Very mild timing.

  3. #3
    Join Date
    Oct 2007
    Location
    PA
    Posts
    2,694

    Default

    I would spend the $140 and send it to flotek. cant beat the price or the quality IMO
    Passion Racing blaster
    LA sleeve 240 cylinder
    Vito's +3mm crank
    39mm Keihin PWK
    Shearer custom built pipe for this motor to Jim's specs
    shaved and rechambered head with 4 angle design
    cases moddified to run banshee TZ bearings
    custom billet intake
    custom billet flange
    custom H2 Piston
    K&N airfilter
    PE billet clutch basket
    RDZ HD clutch springs
    PVL ignition
    WCR 1-5 duneable override
    +4 swingarm
    LSR Honda style hub

    1989 Suzuki LT250R
    ported cylinder
    FMF gold series
    Keihin 38mm PJ
    boyseen rad valve
    reed spacer
    K&N clamp on
    lightened flywheel

  4. #4
    Join Date
    Feb 2006
    Location
    MI
    Posts
    1,476

    Default

    I am wondering how one would even know how much to cut?
    From experience? TSR software?

    I read if you have the whole motor together you could index the piston with a degree wheel and make some scribe marks.

  5. #5
    Join Date
    Jan 2006
    Location
    indiana
    Posts
    817

    Default

    experience is the key but software will point you in the right direction
    their is more than just durations to look like angles of the port roof angles of the sides of the transfer ports directing flow
    110-120$ for a port job sound way to cheep
    and 110-120$ to cut a head high
    a good port job will be around 300$ and around 50$ to cut the head
    you will find you get what you pay for !

  6. #6
    Join Date
    Sep 2006
    Location
    Riverside, Ca
    Posts
    566

    Default

    I would Contact Q he's done enough LT250s his price are fair and you get bang for yoru buck http://www.quadracerhq.com/forum/index.php
    http://www.suzukiquadracerhq.com/
    Where 2 and 4 Strokes get along!

  7. #7
    Join Date
    Oct 2004
    Location
    pennsylvania
    Posts
    14,217

    Default

    to me 300$ + for a single cylinder small bore cylinder port is pretty high no matter who is doing it ...but thats just my opinion ,different strokes for different folks i guess
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    HELP SUPPORT OUR SITE >http://forums.everything2stroke.com/...ad.php?t=35928
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    cheapest ^^performance parts online

  8. #8

    Default

    Quote Originally Posted by eviltwin
    to me 300$ + for a single cylinder small bore cylinder port is pretty high no matter who is doing it ...but thats just my opinion ,different strokes for different folks i guess
    Take a set of alum Dart Chevy heads and have them ported. $300 x 8= $2400 it aint gonna happen LOL and theres less work to be done per cylinder.

  9. #9
    Join Date
    Jan 2006
    Location
    indiana
    Posts
    817

    Default

    LOL a good port job a set of dart,profiler,big chief,514ex or brodix heads is around 3000$ I guess it all what you call good .... a good running big block is around 50K but that will have a true 1250-1260 hp natural on gas so i guess if your happy with the low performance cheep work... you get what you pay for

  10. #10
    Join Date
    Nov 2006
    Location
    northeastern PA
    Posts
    176

    Default

    that would be one mighty stout big block to be naturally aspirated and run on pump gas. cant say that ive seen one of those yet, late models are around 850-900 and that is on alcohol and will set you back 45k. but back to the topic 110-130 dollars is way too much to rechamber a head.
    87 LT250r
    Powder coated frame
    Mikuni 38mm TMX carb
    Ported and polished
    Dynoport large volume pipe and silencer
    Burgard +2 a-arms
    Durablue axle
    works rear shock


    2000 banshee
    t5's
    pro-flow air filter