pipes and big bores
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  1. #1
    Junior Member razor_ray's Avatar
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    who makes a good big bore+porting compatible pipe? i've heard bad stories.
    currently have a ptr '98 eliminator pipe on a 87 wondering if it can handle 300+ cc?
    and what's the best way to get 300cc straight bore or bore/stroker?
    main usage will be sand

    thanks for any advice

  2. #2
    Senior Member Michael88R's Avatar
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    As for the pipe, I have an ATV sport article on Chad Lohr's open class duncan quad. He was using the PT race pipe and the PT eliminator on a 340cc engine. I don't know if that was a newer version of the eliminator though. You could call duncan and ask them if your pipe will work okay.

    On a stock cylinder, lrd and others offered a 300 kit using a re-sleeve and a 72mm piston. That would be cheapest route. You could also get a new 310 kit which also uses a 72mm piston. Lastly you could use a smaller bore and a stroker crank and achieve 300cc. Call some different engine builders and get their thoughts. ESR likes to build strokers. Some builders don't.

    88 TRX250R, ESR 330PV with TRX7 porting, ESR TRX5 std. mount pipe, CR reeds with 38mm Mikuni TMX, Roll Lobo II front end, OEM swingarm, Motowoz front shocks, Elka rear shock, PRECISION Stabilizer, Lsr axle.

    06 TRX450ER, Duncan 470 national kit, Roll Design A-arms, Motowoz shocks front and rear, Houser XC rear linkage, CCP stabilizer, IMS-Roll Pegs and heal guards, Rpm axle.

  3. #3
    Moderator Teddy250R's Avatar
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    who makes a good big bore+porting compatible pipe? i've heard bad stories.
    currently have a ptr '98 eliminator pipe on a 87 wondering if it can handle 300+ cc?
    and what's the best way to get 300cc straight bore or bore/stroker?
    main usage will be sand

    thanks for any advice
    If you are under or around 300cc's I would say your best bet is a Sparks TT or ESR TRX-5.

    Here is a pipe test done by Dave Moore at Dave Moore Racing:
    <\Teddy/>

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  5. #4
    Senior Member Michael88R's Avatar
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    Is that graph showing a trx5 standard mount or center mount?
    88 TRX250R, ESR 330PV with TRX7 porting, ESR TRX5 std. mount pipe, CR reeds with 38mm Mikuni TMX, Roll Lobo II front end, OEM swingarm, Motowoz front shocks, Elka rear shock, PRECISION Stabilizer, Lsr axle.

    06 TRX450ER, Duncan 470 national kit, Roll Design A-arms, Motowoz shocks front and rear, Houser XC rear linkage, CCP stabilizer, IMS-Roll Pegs and heal guards, Rpm axle.

  6. #5
    Moderator Teddy250R's Avatar
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    Is that graph showing a trx5 standard mount or center mount?
    I believe it is the center mount.
    <\Teddy/>

  7. #6
    Moderator BLACKeR's Avatar
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    been a lot of pipe chit chat on here lately. this is the biggest dyno comparison of pipes that ive been able to find. its on a stock motor, so the HP numbers are especially weak for the high rev pipes, but it gives you a basic idea of power curves, and dead spots.

    http://www.atvsource.com/articles/product_...dyno_charts.htm

  8. #7
    Member garrettagr's Avatar
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    i like the esr trx5 centermount which i just picked up. it looks really trick and everyone has good things to say about it. i am running it on a 340pv right now. but sparks pipes are also very good as well.

  9. #8
    Junior Member prerunr250's Avatar
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    I really liked my sparks tt pipe. When I first went with the 350pv that is what I ran. Then I ran across the CPI 800 bb pipe. So I bought one and what a difference. It didn't loose any bottom end but everywere else it pulls like a crazed ape. You can really tell when the pv opens and it gets on the pipe, since your arms are ripped out of their sockets.
    87 250r
    c-leigh/ct 350pv
    38mm as carb/rad valve
    cr ignition
    custom cpi bb pipe
    yup...shes fast

  10. #9
    Junior Member wpzone's Avatar
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    I really liked my sparks tt pipe. When I first went with the 350pv that is what I ran. Then I ran across the CPI 800 bb pipe. So I bought one and what a difference. It didn't loose any bottom end but everywere else it pulls like a crazed ape. You can really tell when the pv opens and it gets on the pipe, since your arms are ripped out of their sockets.
    I have never heard of that pipe from CPI and do not see any info on their website. Do you have any pics or additional info?

  11. #10
    Senior Member Pest's Avatar
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    You have to call them, they are special order only
    2003 LSR 349PV

    2006 long travel busket


 

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