« previous next »
Pages: [1] 2

Author Topic: Improving top speed and high end RPM  (Read 7027 times)

leo.portner

  • Jr. Member
  • **
  • Posts: 58
    • View Profile
Improving top speed and high end RPM
« on: April 24, 2015, 04:28:47 PM »
On my 250i when going 110-115 km/h
The engine rpm is 7500 just befor the red line.
Hod do i reduce the rpms at this speed?
Rollers slidera moltivar??
What is the best way
Logged

BettinANDlosing

  • Hero Member
  • *****
  • Posts: 2235
  • Carter Merz
    • View Profile
    • Columbia Scooters
Re: Improving top speed and high end RPM
« Reply #1 on: April 24, 2015, 04:55:00 PM »
Heavier sliders will improve top speed RPM. But when the variator is maxed out (Around 80mph on my 250) there is nothing you can do to reduce the rpm, because the bike is in it's final gear ratio. The variator is as big as you can go, only a few MM away from the engine case. A slightly larger diameter rear tire will help a little, double check if there is enough room to squeeze that in there. Otherwise, I ride my 250 at 7500-8000 rpm all day long with no problems what so ever. Hope this helps.
Logged
2002 Kymco B&W 300; MRP 78MM "300CC", Naraku cam, Yoshimura rS3 exhaust, 17g Sliders, Yellow torque spring drilled airbox, stock carb #115 main #40 pj.

2001 "Yamaha" Zuma AKA MBK Booster; MHR OverRange, Dellorto 19mm BHBG, Polini "big" intake, RS-3 Rear shock, Stock cylinder.

leo.portner

  • Jr. Member
  • **
  • Posts: 58
    • View Profile
Re: Improving top speed and high end RPM
« Reply #2 on: April 24, 2015, 06:11:07 PM »
I drive 50 miles every day
At 70 mph the rpm is on 7500
I want to stay going on 70.mph but reduce the rpm will hevier rolers or hevier sliders help? What is the main difference.bitween the 2
Logged

BettinANDlosing

  • Hero Member
  • *****
  • Posts: 2235
  • Carter Merz
    • View Profile
    • Columbia Scooters
Re: Improving top speed and high end RPM
« Reply #3 on: April 24, 2015, 06:21:43 PM »
Quote from: leo.portner on April 24, 2015, 06:11:07 PM
I drive 50 miles every day
At 70 mph the rpm is on 7500
I want to stay going on 70.mph but reduce the rpm will hevier rolers or hevier sliders help? What is the main difference.bitween the 2

They might help a bit, sliders open the variator a little wider allowing higher top speed. Heavier will be lower RPM at any given point UNTIL the variator hits its maximum gear ratio.
Logged
2002 Kymco B&W 300; MRP 78MM "300CC", Naraku cam, Yoshimura rS3 exhaust, 17g Sliders, Yellow torque spring drilled airbox, stock carb #115 main #40 pj.

2001 "Yamaha" Zuma AKA MBK Booster; MHR OverRange, Dellorto 19mm BHBG, Polini "big" intake, RS-3 Rear shock, Stock cylinder.

leo.portner

  • Jr. Member
  • **
  • Posts: 58
    • View Profile
Re: Improving top speed and high end RPM
« Reply #4 on: April 24, 2015, 06:57:55 PM »
What size sliders do i need and what weight is recomended
Logged

BettinANDlosing

  • Hero Member
  • *****
  • Posts: 2235
  • Carter Merz
    • View Profile
    • Columbia Scooters
Re: Improving top speed and high end RPM
« Reply #5 on: April 24, 2015, 07:07:50 PM »
Quote from: leo.portner on April 24, 2015, 06:57:55 PM
What size sliders do i need and what weight is recomended

23x18 Dr. Pulley sliders. Weight is a personal preference, you should be around 20-24g depending on what you like the feel of. I have 18g on my B&W but I like to to rev up for more power. Keep in mind if you do heavier weights, it will accelerate SLOWER and be slower up hill.
Logged
2002 Kymco B&W 300; MRP 78MM "300CC", Naraku cam, Yoshimura rS3 exhaust, 17g Sliders, Yellow torque spring drilled airbox, stock carb #115 main #40 pj.

2001 "Yamaha" Zuma AKA MBK Booster; MHR OverRange, Dellorto 19mm BHBG, Polini "big" intake, RS-3 Rear shock, Stock cylinder.

leo.portner

  • Jr. Member
  • **
  • Posts: 58
    • View Profile
Re: Improving top speed and high end RPM
« Reply #6 on: April 24, 2015, 07:13:11 PM »
Logged

leo.portner

  • Jr. Member
  • **
  • Posts: 58
    • View Profile
Re: Improving top speed and high end RPM
« Reply #7 on: April 24, 2015, 07:14:04 PM »
Is this what i need
Logged

BettinANDlosing

  • Hero Member
  • *****
  • Posts: 2235
  • Carter Merz
    • View Profile
    • Columbia Scooters
Re: Improving top speed and high end RPM
« Reply #8 on: April 24, 2015, 07:40:56 PM »
Those are correct, although that shipping price is INSANE. What country are you in? Call these guys:
Buggy parts NW https://www.buggypartsnw.com/
Logged
2002 Kymco B&W 300; MRP 78MM "300CC", Naraku cam, Yoshimura rS3 exhaust, 17g Sliders, Yellow torque spring drilled airbox, stock carb #115 main #40 pj.

2001 "Yamaha" Zuma AKA MBK Booster; MHR OverRange, Dellorto 19mm BHBG, Polini "big" intake, RS-3 Rear shock, Stock cylinder.

leo.portner

  • Jr. Member
  • **
  • Posts: 58
    • View Profile
Re: Improving top speed and high end RPM
« Reply #9 on: April 24, 2015, 08:15:12 PM »
Allredy had this conversation man... Im from israrl
Logged

BettinANDlosing

  • Hero Member
  • *****
  • Posts: 2235
  • Carter Merz
    • View Profile
    • Columbia Scooters
Re: Improving top speed and high end RPM
« Reply #10 on: April 24, 2015, 08:18:40 PM »
Quote from: leo.portner on April 24, 2015, 08:15:12 PM
Allredy had this conversation man... Im from israrl

Sorry about that!!! Forgot it was the same 250AFI!!! Those weights are correct, just make sure they are the correct weight you desire.
Logged
2002 Kymco B&W 300; MRP 78MM "300CC", Naraku cam, Yoshimura rS3 exhaust, 17g Sliders, Yellow torque spring drilled airbox, stock carb #115 main #40 pj.

2001 "Yamaha" Zuma AKA MBK Booster; MHR OverRange, Dellorto 19mm BHBG, Polini "big" intake, RS-3 Rear shock, Stock cylinder.

leo.portner

  • Jr. Member
  • **
  • Posts: 58
    • View Profile
Re: Improving top speed and high end RPM
« Reply #11 on: April 24, 2015, 08:25:03 PM »
25 or 28 g
Im thinking
My drive is a long high speed no hills if i can get the 250 wotking in less rpms
Logged

BettinANDlosing

  • Hero Member
  • *****
  • Posts: 2235
  • Carter Merz
    • View Profile
    • Columbia Scooters
Re: Improving top speed and high end RPM
« Reply #12 on: April 24, 2015, 11:06:02 PM »
Quote from: leo.portner on April 24, 2015, 08:25:03 PM
25 or 28 g
Im thinking
My drive is a long high speed no hills if i can get the 250 wotking in less rpms

I would try 25, 28 will be very very heavy for that engine. If you are good with tools, you can get the 28g and then if they don't work use a dremel tool and shave off some of the brass to lighten the weights. Don't you need that acceleration to run from rocket strikes though?
Logged
2002 Kymco B&W 300; MRP 78MM "300CC", Naraku cam, Yoshimura rS3 exhaust, 17g Sliders, Yellow torque spring drilled airbox, stock carb #115 main #40 pj.

2001 "Yamaha" Zuma AKA MBK Booster; MHR OverRange, Dellorto 19mm BHBG, Polini "big" intake, RS-3 Rear shock, Stock cylinder.

leo.portner

  • Jr. Member
  • **
  • Posts: 58
    • View Profile
Re: Improving top speed and high end RPM
« Reply #13 on: April 25, 2015, 08:04:00 AM »
Lol!!! Good one!
Your right i will go 5g
Logged

de dee

  • Hero Member
  • *****
  • Posts: 2055
  • 2011 300i downtown 82,265 KM.
    • View Profile
Re: Improving top speed and high end RPM
« Reply #14 on: April 29, 2015, 03:24:16 AM »

  Take your variator cover off and see how high the belt goes on the vaiator, rev the moter up and take a look,  just make sure the bike is stable on its center stand,
Logged

An Error Has Occurred!

Call to undefined function split()
Back