01. Why my JAZZ / Metro so slow, can't even go uphill!? I felt a train behind me while crossing bridges...
02. How can I gain more power on torque / take-off? So many drivers cursed me...
03. How fast I will get from your upgrade kit? I want 100km/hr...
04. Do you have 70cc cylinder kit for JAZZ / Metro? I saw stores in U.S. carry it...
05. Do you have high angle camshaft for JAZZ / Metro? I heard it helps on torque...
06. Why I have to spend so much money to gain so little speed? I'm a cheap guy...
07. Why 06' and 07' JAZZ / Metro run faster than older models? My 02' only get 62km/hr top-speed on flat...
08. What kind of gas, engine oil and coolant I should use? So many choices in gas station and parts' shop...
09. What else I can do to my JAZZ / Metro? I want to spend a lots of money...
  01. HONDA Genuine ECM versions and roller weights table.
02. KITACO Hybrid CDI Unit Installation.
  01. Why my JAZZ / Metro so slow, can't even go uphill!?
Be realistic, your scooter is a "4-Stroke" and "50cc"... It's nothing wrong with 4-Stroke engine, it's also ok with 50cc displacement, but it's totally wrong for speed wise! Unless you swap engine or upgrade it, there is no way you will have same torque as 2-Stroke 50cc scooters, ask your friends who have 2-Stroke scooters such as HONDA Dio or YAMAHA Vino 2-Stroke then try it, you'll know what we are talking about.

We believe the main reason for you to bought JAZZ / Metro is "Retro-Style" and "HONDA", so beyond these points, you have to live with it and accept how it runs! It's just a "4-Stroke 50cc" scooter! We have refurbished HONDA Giorno 2-Stroke 50cc in limit quantity for sell, if you want more torque...
  02. How can I gain more power on torque / take-off?
Well, they should cursed you, because you blocked the whole traffic line...
There are 3 ways you can gain more torque:
a). Upgrade it with bigger bore cylinder (Which is impossible! See FAQ 04.), bigger carb, bigger everything... It helps, ha!
b). Swap the whole engine to either a 4-Stroke 125cc, or 2-Stroke 50cc such as YAMAHA Vino.
c). Throw it away and get a 4-Stroke 125cc or 250cc scooter, since you're a 4-Stroke lover...
  03. How fast I will get from your upgrade kit?
100km/hr!? Wake up, dude! Our STAGE 1 Power Kit can increase some of torque, discharge the rpm limits which controlled by ECM (Engine Control Module) within safety range, but your engine is still "50cc"; After upgraded, you may have 15% torque increase without speed limit on top-end, maximum speed may increase 8~10km/hr on flat ground depends on scooter's condition; Our 2004 model got 80km/hr top-end speed during the downhill test rides.
  04. Do you have 70cc cylinder kit for JAZZ / Metro?
We know some stores in U.S. have it; However, the big bore cylinder kit for us means New-Molding, New-Made, New-Design on Cylinder Block and Bigger-Valves, NOT came from a stock cylinder and bored it to maximum size.

The stock cylinder is 39.5mm (49cc) and you can maximize it to 42.0mm (63cc) or even bigger, actually most of stock 49cc cylinders can do so, because they designed to take more than 4 times boring if you seized engine, but cylinder wall will be thinner each time (0.5mm) and somehow dangerous, please see zipped pictures.



We asked manufacturers in Japan and Taiwan back in 2004, such as: Takegawa, KITACO, DAYTONA, KH, CHAR-Mo... etc., their answers are: "We can make it, but only few people would buy it, because price for customer and total cost for us are too high."

As you may ware JAZZ / Metro engine design is totally different with other scooters, so if you want to make a new cylinder block, you've to make new crankcase as well, the molding expense and R&D cost will be very high. We and our manufacturers concern the Safety and Performance at the same time, that's why even JAZZ / Metro original engine was released at 1999 in Japan, but none of us actually making the bigger bore kits in past 8 years.
  05. Do you have high angle camshaft for JAZZ / Metro?
Yes, we do, it'll be available in Summer 2007, with camshaft and special springs.
  06. Why I have to spend so much money to gain so little speed?
Because it's a "4-Stroke 50cc" scooter, it never runs fast... Most people never had scooters before, so they have no comparison to know the difference in between 4 and 2-Stroke, speed range are totally different even they are all 4-Stroke 50cc.

The JAZZ / Metro is not made for speed, 4-Stroke liquid-cooled engine makes upgrading expense higher, one piece cylinder crankcase design makes molding harder, that's why most of performance parts are focus on Transmission, Intake and Exhaust system; Also, majority upgrade parts come from Japan have higher retail prices, that's why SCOOTER by jiangwayne.com is manufacturing parts with associate factories in Taiwan, then provide the customers lower parts' prices.
  07. Why 06' ~ 08' JAZZ / Metro run faster than older models?
Don't worry, your 02' JAZZ / Metro is normal... We believe HONDA changed some electro-devices and parts in 06' U.S. / Canadian and after models, see our ECM table for more details; Based on our test ride, 06' JAZZ / Metro can do top speed 66km/hr on flat ground (From stock speedometer reading.) compare with 02' model's 62km/hr, also faster when riding downhill.
  08. What kind of gas, engine oil and coolant I could use?
There are hundreds of choices in gas station and parts' shop, but not all of them will fit; Gas is very important for 4-Stroke engine, we used to have 95 or 98 in Japan / Taiwan for better lubricate, so higher Octane is better; Synthetic oil / lube always better than mineral because it won't produce oil-mud and less longer; Also the coolant should be same as Japanese car because the materials of radiator, see following our recommendation:

Parts Manufacturer Specifications What we 're using?
Tire Pressure Air - FR 1.25kg / RR 2.00kg Nitrogen - FR 1.25kg / RR 2.00kg
Spark Plug: NGK CR8EH-9 DENSO U24ES-N
Gasoline: 87 91 or 94 High Octane
Engine Oil: 10W-40 5W-50 Mobil-1 Full Synthetic Oil
Gear Oil: 80W-90 75W-90 Castrol Full Synthetic Oil
Coolant: HONDA Type-1 (50%-50%) HONDA Type-2 (No mix required.)
  09. What else I can do to my JAZZ / Metro?
Sounds great! If you knew JAZZ / Metro can't run faster, it's a very good point to start; There are thousnad things for you to do, depending on how fast you want to burn the money... See our upgraded models: SCOOTER AF55 Type-J, SCOOTER AF55 for Samson, you will have some ideas.

  DIY 01. HONDA Genuine ECM versions and stock roller weights table.
This table will help you on engine tuning and upgrades.

Years ECM Versions Roller Weights Main / Pilot Jet KITACO CDI?
2001: GET-67 CU-02 2.0 xxx 6.0g x6 (ø16mm) #75 / #35 OK!
2002: GET-67 CU-02 2.5 xxx 6.0g x6 (ø16mm) #75 / #35 OK!
2003: GET-67 CU-02 3.1 xxx 6.0g x6 (ø16mm) #75 / #35 OK!
2004: GET-67 CU-02 3.N xxx 6.0g x6 (ø16mm) #75 / #35 OK!
2005: GET-67 CU-02 5.1 xxx 6.0g x6 (ø16mm) #75 / #35 OK!
2006: - - - OK!
2007: - - - OK!
2008: - - - -
  DIY 02. KITACO Hybrid CDI Unit Installation.
Please download zipped file, 9 steps with photo instructions, present your Invoice# when ask us for password.


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