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Topics - mrbios

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16
Grandvista 250cc Scooter How To Repair pictures exhaust, top case, adjust valves / valve adjustment, fuel filter, remove plastic, Tune Up, carburetor parts, carb clean, air filter, tire and wheel removal, drive belt inspection, remove / replace, final drive oil etc...

Other Models: Carburetor versions of Grand Dink 250, Bet & Win 250, People 250 (except for the body work / plastic panels)

Master Reference & How to.

These pictures are a great reference for how stuff comes apart, proper routing of cables etc.  The main picture file is almost 1GB so be patient during download.

How to download... RIGHT CLICK each zip file and choose "Save As"or "Save Target As" or "Saved linked content as" etc to download your own personal copy.

http://www.wecandobetter.com/dnload/Grandvista/

At this time my GV have 19K miles and is still running well. 

17
Grandvista 250 / Great video of a new 2009 Grandvista....
« on: August 14, 2015, 02:03:33 AM »
Grandvista:

I like the music.

and this video comparing different Kymco scooters with ABS vs non ABS... keep watching as the real difference happens when the track is wet.


Good speed test Kymco 350i:


18
Here is a link to the photos of my latest mirror repair.  I parked the scooter on a very slight hill and it rolled forward and fell on the left side and broke the new $180 mirror that I replaced last Dec.  If you own and ride a Grandvista sooner or later you will find your self with a broken mirror.  I highly recommend always folding the mirrors in.  It also helps keep the contact clean on the switch with corrodes over time.  My 2005 GV started having issues around a year? ago.

http://www.wecandobetter.com/dnload/Scooters/Kymco

Right click: Mirror_Repair.zip (size 45MB) and select download.

19
Grandvista 250 / Kymco Grandvista 250cc Scooter front tire change
« on: July 28, 2015, 12:22:15 AM »
My latest video shows how to change a scooter / motorcycle tire using my 2005 Grandvista to demonstrate.



20
Dear BettinANDlosing,

It looks like you upgraded your B&W aka GV aka GD 250cc scooter.  Do you have advice on purchasing a kit to upgrade the stock 250cc GY6 engine?

I'm thinking about replacing the Grandvista (GV) with a larger scooter like the Piaggio BV350 or Burgman 400 OR keep the good times rolling with the GV which now has 16K miles on it and still running good.  Just looking for a little more power and speed on the freeway. 

Questions after the larger motor is installed:
1. Is the power gain worth it?
2. Can the stock carb be used with larger jets?
3. Can the stock exhaust be used or an exhaust that isn't too loud?
4. What will the MPG be?
5. Is there a kit or if you buy parts how do you know what you will need?

21
No wear bands showing must be ok?  - Just Kidding.  More interesting title than "wear report: Avon Viper Stryke".


22
... it seems U.S. customers prefer the 16" wheeled models....

I'm one of those customers.  As a GV250 aka Grand Dink / B&W scooter owner for the past 3.5 years I think the GV250 strikes an amazing balance between the feel and ease of handling of a "small" 100 - 150cc scooter yet offers the power and handling to do 75 mph+ on the highway.  Great wind protection with a relatively "thin" profile that can still get between cars in traffic for California "lane sharing".

Complaints with 12" tires:
1. low ground clearance limits lean angle and thus turn speed.
2. I hit the center stand a lot - and I don't consider myself an "aggressive" rider.
3. pot holes especially when hidden at night practically knock the fillings out of your teeth.  I find myself saying 'wow' wtf, after being surprised by one.
4. Tires wear out sooner [almost bald at 6K miles] - as the tire rotates more often due to small size and are a real pain to change - Think about getting a flat tire in the rear + the hassle of dropping the exhaust. 
5. Limited suspension travel - means a very harsh ride.
6. Tire selection - lots in 16" think motorcycle, very limited choices in 12".

Ideal Tire Size?
While I like 16" tires I don't necessarily need something that big but I want something bigger than 12".  My ideal size is 14"+.

GV250 vs Burgman 400 and probably Yamaha Majesty
GV beats both for easy handling, lane sharing, off the line acceleration, slim non-bloated profile, outstanding smooth clutch / CVT operation - only vespa makes a slightly smoother transmission.

50mph+ Mid & top end:
The Burgman 400 & Majesty blow the GV away offering 90mph+ while providing as good or often better mpg and better high-speed handling.

Maintenance:
GV has some weak points - exhaust is a pain to reinstall and know to develop rattles and crack at around 10K miles.  Air filter is unnecessarily difficult to change. Radiator - tiny hoses trap air and make expelling air after a complete change a nightmare and could overheat the engine if ridden on the highway while air is still trapped around the water pump. 

PROS - easy to access and adjust the "screw type" two valves vs the nightmare of the Burgman's needless shim-under-the-bucket and the nightmare of Tupperware plastic to remove to access the motor.

GV's clutch lacks the various issues that the Burgman has had and offers better smoother operation.  Based on two 2007 Burgman 400's I rode I feel the GV has a little less handlebar vibration.

I bought my 2005 GV used 3.5 years ago with 2600 miles now I have almost 16K.  Only persistent problems have been - back light flickers and goes out on the speedometer display (only a problem at night) & exhaust has cracked repeatedly requiring me to weld it.

Final Note & Future Scooter:
I often ride my scoot 7 days a week - southern California = no rain and mild "winters".  Day in and day out my scoot starts right up hot/cold/ damp or even once in a while in the rain - totally consistent like a modern car.

FUTURE - I believe 350 cc's single cylinder like the Piaggio BV350 is the ideal  mix of power (for highway riding), high-speed handling, mpg and the all important thin profile that can slip through traffic while still offering good wind protection on cold days or at night.  400 / 500+ cc's brings undesirable bloat - width and weight, power that is rarely used or needed, poor mpg and makes the scoot too fat to get between cars.

23
Technical | How To / Starting Problem & Solution 250cc
« on: December 15, 2014, 08:33:04 AM »
PROBLEM:
Kymco Grandvista Grand Dink 250cc.  Always started right up.  Then one day it required excessive cranking for about 10 seconds in order to start.  Rest of the day started fine.  A few days later I had problems starting and this time I could hear that the motor was turning more slowly and the scoot would not start.  I hooked up jumper cables and it started instantly. 

SOLUTION:
Replaced the original 9 year old Yuasa battery with a new one and the scooter is back to starting instantly. 

24
Kymco Grandvista / Grand Dink:


Carburetor Cleaning & Theory three part series:








25
Updated: 05-13-2014

I updated and added a few videos.  Each one is between 3 and 5 minutes.

These two videos are of the carburetor version of the Grandvista, Grand Dink, People 250 and any other Kymco scooters or motorcycle? that use the 250cc motor.  After about 2009? Kymco switched to fuel injection so the information in these videos does not apply to any fuel injected scooters.

I deal with the pilot jet or slow jet, main jet, off idle hesitation, Throttle Position Sensor or TPS, aftermarket Keihin Carburetors, changing the pilot jet to a larger size, using an Ultrasonic cleaner and copper wire to clean holes that get clogged.  I also examine the vacuum diaphragm / vacuum piston. I also discuss adjusting the idle mixture screw or Pilot Screw.  I will add a third video when I perform the work of removing the carb on the Grandvista.

Kymco Grandvista / Grand Dink:



Carburetor Cleaning & Theory three part series:










26
Bet & Win 250 / delete
« on: April 17, 2014, 01:30:56 AM »
Moderator - please delete this was an accidental misplacement of the post.

27
Update:: 05-21-2014 latest results: I was finally able to return to the stock pilot jet #38 with no hesitation. This afternoon I installed #48 for the pilot jet and increased the Main Jet from #102 to #115.  #115 was way to big and the scooter didn't run right.  Tonight I reinstalled #102.

Update:: 05-14-2014 Yesterday I installed a different sized pilot jet #45 and I could feel a minor hesitation.  Today, I removed my carb and drilled the copper plug near the pilot screw so I could stick a wire in the passage.  I used individual strands of 12 AWG Stranded wire 0.019" (0.48mm) ~ 25.5 AWG. The wire barely fits in the thinnest part of the passage.  On a different carb 20 gauge wire (0.81mm) fit with lots of room to spare. See attached pic at the bottom. 


Kymco Grandvista / Grand Dink:



Carburetor Cleaning & Theory three part series:







Keihin CVK30 30mm carburetor - Constant Velocity Keihin (CVK)

Pilot Jet (aka Slow jet) = # 38S --- Part# N424-51B38            $4.99  (Keihin Part # N424-21)   (all sizes are are same price)
Main =                             # 102 --- Part# 99101-116-1020     $3.21  (Keihin Part # 99101-116)

http://www.rockymountainatvmc.com/p/930/24375/Pro-X-N424-21-Series-Keihin-Pilot-Jet-


28
Update:05-14-2014

Solution: I needed to remove the left brake lever light switch and clean the contact which had become corroded. This is the tiny square black switch that makes a click noise when either brake lever is pushed.

I posted this in the grand Vista area also I'm just hoping to get more eyeballs on the problem.

When I push the starter button nothing happens.  The battery is fine.  I'm holding the break lever and the kickstand is up and then I keep pushing the starter button sometimes I turn the ignition key on and off then suddenly it starts up fine.  When I push the button I noticed that there are no sound.  I suspect that maybe the switch on the brake lever is faulty and preventing the starter from operating?

keep in mind that when it cranks over it cranks over at full speed and starts right up its just while the problem is happening I push that starter button and nothing happens no noise no sounds nothing.  the problem started gradually a little over a month ago.  it doesn't happen every time often times it starts up fine.

I would appreciate any help thanks.

PaulC
Grandvista 250
2005 12,600 miles.

29
PROBLEM:
When I push the starter button nothing happens.  The battery is fine.  I'm holding the break lever and the kickstand is up and then I keep pushing the starter button sometimes I turn the ignition key on and off then suddenly it starts up fine.  When I push the button I noticed that there are no sound.  I suspect that maybe the switch on the brake lever is faulty and preventing the starter from operating?

SOLUTION: (Updated: 05-06-2014)
Corrosion on the Rear Brake switch.  Here's the deal.  The two brake levers have a switch that is Normally Closed (NC) meaning power is allowed to flow through the switch when it is NOT pressed.  Pressing the brake lever (un-press's) the switch and which closes (completes) the connection and puts the brake light on and allows you to start the scooter.

Weird - when the switch is mounted it is pressed in by the brake lever which breaks the connection (no brake light).  When you press the brake lever you hear a click as the lever moves away from the switch and stops pressing it which cause the switch to close the connection.

Diagnostic Steps:
When things were working (most of the time).  I noticed that if I had the kickstand up, scoot switched to Run, ign key in starting position and I pressed the brake lever then touched the start button (even for a second)  the LCD screen resets (same as when you first turn the key to on) and the head light goes off (to maximize power to the starter).  But, when the problem happened and I pressed the start button the screen did not change and neither did the head light.  I then suspected the Left brake light switch.  I found if I held the starter in and pumped the brake lever a bunch of times the starter suddenly worked.  Also, I found when it was not working that the rear brake light did not go on with the left lever but it did go on when the front brake (right lever) was pressed. 

After I parked the scoot for 3 weeks due to losing the drain screw on my carb the scoot would not start at all.  I removed the switch and manually connected the wires and the scoot started perfectly every time.  I priced the switch online and it costs $20 + s&h.  I then pried open the switch, cleaned the contact with sand paper, reinstalled it and everything is working great.

Interestingly, the switch never failed to make the clicking nose.  Moral of the story: just because it clicks doesn't mean the connection is ok.

PaulC
2005 12,600 miles.


30
Grandvista 250 / GrandVista Aftermarket Brake pads...
« on: December 31, 2013, 05:51:52 AM »
Has anyone ever replaced the rear brake pads on a Kymco Grandvista 250?  I have been looking online but none of the pictures match the picture I took of my worn-out rear brake pads?

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