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Viewing 13 posts - 1 through 13 (of 13 total)
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  • #77249

    John Wehrheim
    Participant
  • #28487

    John Wehrheim
    Participant

    Top Kart replied back with a standard setup for the 32 mm Speedy chassis.

    Toe out : 2-3mm total

    Caster Top: IN (dot towards front)

    Caster Bottom: 0 eccentric

    Front ride height: big spacer on bottom with the other 3 on top

    Spindle Spacers: 1Big (10mm) 2Small(5mm) inside of Front Wheel Hub

    Axle: Blue

    Rear Hubs: 98mm

    Rear width: 45.5-55 inches

    Rear ride height: Axle 3rd hole down (chassis high)

    It would be good to know your weight and height, plus the tires you plan to use.

  • #24174

    John Wehrheim
    Participant

    John, what kind of clutch stall speeds are you guys running with the SR-Y? Good to hear you’re getting that much time out of the motors. Mine should be fresh for the next race. Are you doing rings or pistons in-between rebuilds?

    No rings and pistons between rebuilds. I use Burris Castor and Burris Blend. 4oz of each per gallon. I run around 8,900, but I’m still using a Horstman wet clutch.

  • #24160

    John Wehrheim
    Participant

    Jeremy,
    Yep, the Y pipe is all bottom and mid. There is no advantage to rev the motors past 14,200. In fact you might find it better to have it even lower around 13,900 or 14,000. Also I had a whole year on my motor 12 races and probably 4 practice days and I just sent it out for a rebuild. It still ran strong and the cylinder still looked great, but rather be safe than sorry. Hopefully I can get the GA boys up to race the 27th.

  • #21071

    John Wehrheim
    Participant

    Guys,
    I am not an engine builder. All I can tell you is that there are some slight improvements in the carb, shape of the head and port heights. On the track, I have seen very little improvement. Initially I just used my Can motor and carb and slapped on the header, flex and pipe. Having the motor built for the pipe really did not gain me anything at our track which is only 3/10ths of a mile.

  • #20985

    John Wehrheim
    Participant

    Announcement has been made GoPro Motorplex will be adopting the Sr-Y pipe. We hope to have a bunch of us come race from Georgia. Looking forward to it.

  • #20794

    John Wehrheim
    Participant

    Are they DoImg anything different to the motors?

    Yes, but very slight. Maybe a tenth.

  • #17192

    John Wehrheim
    Participant

    Ted,

    Word on the street is that we’re going to a pipe next year. I haven’t heard anything official yet though. Perhaps a new tire as well. I may have a spare can lying around, though I think you can probably pick one up on ebay for cheap (that’s where I got mine).

    That would be great. We have about 8-10 Yamaha Sr’s running the pipe in Georgia and would like to come up and race this year. GoPro is a fantastic track!

  • #16948

    John Wehrheim
    Participant

    Ted
    We have approx 10 Yamaha Sr’s racing the pipe and it is far better than the can. There is a bunch of us from Georgia that would like to come up and race but we haven’t due to the can. Maybe you and others can get them to change for 2014.

    A bunch of us plan to race at Atlanta Motorsports Park on Dec 14th with the pipe. More info at http://www.tsracingatlanta.com.

  • #9560

    John Wehrheim
    Participant

    It will smoke and drip oil until everything is well sealed and you did have the high needle rich if you ask me.

  • #9380

    John Wehrheim
    Participant

    Another is Adkins. They are all good. One way to pick is who is closest to you.

  • #24158

    John Wehrheim
    Participant

    Jeremy,
    I know many of us want to come up for to race from Georgia, it’s trying to get everyone up at the same time. Maybe we can communicate amongst the yamaha drivers through email. I will send you a private message with my email.
    Thanks
    John

  • #20707

    John Wehrheim
    Participant

    SR Y produces 2hp more. At our track (barnesville)  3/10 mile the SR Y is .5 seconds faster.  A 7/10 plus track will be around a second faster than can. The SR Y is so much better. 2 hp more, more torque, lower heat, easier in the motor.

Viewing 13 posts - 1 through 13 (of 13 total)