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Thread: big bore ??????

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    big bore ??????

    i have an 01 1200r with a number of mods but i am thinking if freshening up the engine. its had a hard 95 hours. will going big bore give me better throttle respons and more low down grunt as its built for jumping. or will it give me more up top


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    Moderator DrewNJ's Avatar
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    Quote Originally Posted by jetski1200r View Post
    i have an 01 1200r with a number of mods but i am thinking if freshening up the engine. its had a hard 95 hours. will going big bore give me better throttle respons and more low down grunt as its built for jumping. or will it give me more up top
    It will give you more motor...period.
    If you have the money you won't be disappointed in the results..

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    Quote Originally Posted by jetski1200r View Post
    i have an 01 1200r with a number of mods but i am thinking if freshening up the engine. its had a hard 95 hours. will going big bore give me better throttle respons and more low down grunt as its built for jumping. or will it give me more up top

    i dont know how much u have to spend but a big bore is really expensive
    your gonna need to get nig bore cylinders and pistons
    trued and welded crank and have your carbs modded i think for the bigger cylinders and alot more i think
    i would stay with the stock top end but modd it like get heads and and reeds and little things like that

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    sleeplessnMS's Avatar
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    Put it this way I had an efi with all the bolt ons and shit but stock 1300 motor. I went 1390bb ported with a lil compression picked up nearly 6mph and night/day difference in holeshot midrange. goin from 1200 to 1390 OMG!!! Ya wont be sorry......

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    Flying Scotsman's Avatar
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    Go big

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    if you got the cash go true big bore and port it , thats about 3500 USD in work and parts alone...... but if cash is a bit tight just bolt a stock or ported 1300pv top end on to it, they go straight on without a fuss.

    I did the latter to my 2002 GPR and am reasonably happy with the results but i did a fair bit of work to get there like full 05 pump upgrade, advent cdi, novi48's, vf3's, 1300 top end, ff, df14/22, milled head and a few other things. I went from low 60's to mid 70's with that setup and its still far from tuned.

    bigbore+ porting will get you into the 80's no problems ( when done properly) if setup for top end but the down low torque is suposed to be pretty wicked as well.

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    Pistonwash's Avatar
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    Go big and then change your sig!

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    WATER WOODY's Avatar
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    Quote Originally Posted by jetski1200r View Post
    i have an 01 1200r with a number of mods but i am thinking if freshening up the engine. its had a hard 95 hours. will going big bore give me better throttle respons and more low down grunt as its built for jumping. or will it give me more up top

    Going from a 1200 stocker to a 1390 is HUGE! The power is just stupid!

  9. #9
    Quote Originally Posted by izz0 View Post
    if you got the cash go true big bore and port it , thats about 3500 USD in work and parts alone...... but if cash is a bit tight just bolt a stock or ported 1300pv top end on to it, they go straight on without a fuss.

    I did the latter to my 2002 GPR and am reasonably happy with the results but i did a fair bit of work to get there like full 05 pump upgrade, advent cdi, novi48's, vf3's, 1300 top end, ff, df14/22, milled head and a few other things. I went from low 60's to mid 70's with that setup and its still far from tuned.

    bigbore+ porting will get you into the 80's no problems ( when done properly) if setup for top end but the down low torque is suposed to be pretty wicked as well.
    +1, good advice here. Even going from 1200 to a stock 1300 top end is quite noticeable.

  10. #10

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    i have a 1300r as well speed is not a problem, but i would like more gut chirning acceloration

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