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Author Topic: new pipe  (Read 5774 times)

zombie

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Re: new pipe
« Reply #15 on: January 08, 2015, 09:23:40 PM »
At wot or slightly less?

IME you want to hit the red line just before WOT so you still have something left. Maybe that's just the way I like it tho...

My little ZX spins 14k rpm, and I consider the red line at 10.5 - 11 k rpm. after 12k there is no power to be made but it will hold that rpm for the better part of a mile w/ no sign of letting go.

My point is your bike can spin a lot higher than 9k w/ the stock crank. 10 - 12k is still very safe. (with Pre-Mix)
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mroc

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Re: new pipe
« Reply #16 on: January 09, 2015, 02:28:11 AM »
Good to know , gonna drop the rollers down to 8.5 and see where that sets it yah after riding today it does need a lil more rpm for more smooth accel, it has a dead spot around 40 clicks right now
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zombie

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Re: new pipe
« Reply #17 on: January 09, 2015, 03:00:40 AM »
That's exactly what I mean. The red line rpm doesn't matter as long as the cruise rpm is within the powerband,

You want to be able to cruise the bike at what sounds good (never mind the tach), and still have some power left above that.
 The pipe, and the cylinder (in the big picture) have to match. You'll learn this as you read more. No offense.

Cylinders are ported. these ports are specific sizes. The size, and placement effect the rpm that the cylinder likes to run.
The pipe is nothing more than a pump. This pump pushes air backwards into the cylinder. (sounds wrong eh!)
This pump forces un-burnt gasses backwards into the cylinder to be burned (again).

That's how a 2t works. It's NOT in one stroke of combustion. It's in two strokes that repeat over again. Reading more on 2t cylinders  http://iheartstella.com/resources/manuals/tuning/Graham-Bell-Two-Stroke-Performance-Tuning.pdf
You will see what I mean.

The pipe creates a sound wave that pushes gasses back into the exhaust port to be mixed w/ the new vaporized fuel charge. since this is a MIX of hot gaeese, and raw (cool ) fuel it has an octane rating that can com-bust in a controlled manner. ie: no "ping".

I forget where this was going, and I don't want to look back...


Every PART of a 2t is linked to create a perfect balance. Putting a 9k rpm pipe on a 7k rpm cylinder does NOTHING but waste money. It many times makes LESS power than a stock pipe.
BUT you can take a 7k cylinder, and raise the ports, and widen the ports to make a 9K cylinder for free.



Now to be clear I HATE this guy (DIO SPEED DEMON) He's wrong as many times as right.
But to be sure... Follow Grams book, and learn the principals. If you really want more info on fine tuning ask me. Dio SP D. is wrong on a lot of things but I know better.
Porting, and pipes are like George, and Gracie or Ralph, and Alice.
They are no good without each other. 

Happy to help...
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mroc

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Re: new pipe
« Reply #18 on: January 09, 2015, 03:08:45 AM »
One of my four super nines
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mroc

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Re: new pipe
« Reply #19 on: January 09, 2015, 03:12:16 AM »
A picture of.a.few other ones I got
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zombie

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Re: new pipe
« Reply #20 on: January 09, 2015, 03:19:42 AM »
You have too many bikes to fu&k w/ us...

How could you NOT know how to tune them...

I'm just messin' w/ you bro. It's GREAT to see a stable of mopeds!
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BettinANDlosing

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Re: new pipe
« Reply #21 on: January 09, 2015, 04:45:53 AM »
Hell yeah MBK Booster!!!! I got a 2001 "Yamaha", wheelie BEAST!!!! That's my bike I'm planning to set the Guinness World record longest scooter wheelie this summer hopefully. Good collection man!
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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.

BettinANDlosing

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Re: new pipe
« Reply #22 on: January 09, 2015, 04:54:51 AM »


 ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::)
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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.

zombie

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Re: new pipe
« Reply #23 on: January 09, 2015, 05:00:24 AM »
WHAT?? ?? ?? You have a YamI????????? BITCH!

Y'd you wait so long to tell us?

I'm gonna move next door, and blast Dead Kennedy's till your ears bleed!

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"They have nothing in their whole imperial arsenal that can break the spirit of one Irishman who doesn't want to be broken."   Bobby Sands...

BettinANDlosing

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Re: new pipe
« Reply #24 on: January 09, 2015, 05:21:33 AM »
I've had the new style zuma 50 and sold it years ago. I had an itch to get another 2t. I've loved the "prebug" forever and this little gem was for sale up around Seattle. 300 miles, garaged it's whole life. Last import year to USA. And these aren't really Yamahas, it's a French company MBK that used to be motobecane. Yamaha paid them to produce for the USA and slapped Yamaha stickers on it and named it the Zuma. This is literally the easiest bike to wheelie, the back wheel is directly below and there's almost no weight on the front. In a month or so that's why I wanted to borrow that pressure tester, I'm dropping some $$$ to build the internals. Polini 70 and full circle crank. Already got an mhr overrange dialed in and 19mm Dell' with the big intake and all. Still too gutless hence the winter build lol. I need to clear my lift and start ordering parts. One cool thing about the design of the vertical minarelli is the reed block is in the cylinder, not ideal for maximum rpm horsepower but built right they have massive torque at moderate rpm. I'm using stock exhaust on my 70cc build to keep a wide powerband, and hopefully I'll have a 60mph torque machine.
« Last Edit: January 09, 2015, 05:24:54 AM by BettinANDlosing »
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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.

mroc

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Re: new pipe
« Reply #25 on: January 09, 2015, 05:31:45 AM »
Just got this pipe in the mail for my pre bug. It is been by me and is half way there. Currently 19mm dell mk2 carb, stage 6 intake with vforce horizontal mod reed cage, athena 70 cc aluminum kit and tuned out cvt. Last summer I was running on highways doing 115km/h. It was a blast passing cars on such a small frame scooter.
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BettinANDlosing

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Re: new pipe
« Reply #26 on: January 09, 2015, 05:33:49 AM »
Nice mang, they are sick little scooters. What country are you in?
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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.

mroc

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Re: new pipe
« Reply #27 on: January 09, 2015, 05:37:44 AM »
Vancouver Canada
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BettinANDlosing

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Re: new pipe
« Reply #28 on: January 09, 2015, 05:43:57 AM »
Cool, I've heard people say Vancouver is Portland's sister city. I like the Euro front light setup you got. I regret not going with the stage 6 intake setup, i ended up getting the Polini big reed cage with two reeds. The design of the stage 6 looks better tho.
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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.

zombie

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Re: new pipe
« Reply #29 on: January 09, 2015, 05:50:19 AM »
I hate you both!!!

Now I'm sticking to molecular medicine. F' a bunch of scooters!!!!!
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