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If I install a "Big Port Valve Head" for an upgrade on my gy6150 (stock cylinder - NO bbk) would I need a bigger tailpipe to run to the muffler ?
I ordered a performance muffler but haven't really planned for the tailpipe.... because I do not know if I need a bigger tail pipe. Do I

This is my 3rd cylinder head change - long story short.

Looking at upgrading to a High Performance Big Port Valve Head - Sooooooo, the questions and my
bike specs ar as follows:

QUESTIONS :

whats the ultimate cost to me ?

1.) GY6 150cc High Performance Big Port Valve Head = $73.00
2.) 8MM EXHAUST STUDS AND NUTS = $8.00
***SO FAR.

However, will I need :
1.) Bigger carb = $??.??
2.) Bigger intake port = $??.??
3.) Bigger - performance exhaust = $??.??
4.) performance camshaft (A8 or A9) = $??.??
If a new cam shaft what about a new chain = $??.??

Other unknown important info :
1.) Valve gap - in & out

MY EXISTING SPECS:

VARIATOR : MOTORIO DUAL RAMP (SHORT & LONG RAMPS) 115 MM FACE PLATE & FAN
VARIATOR WEIGHT(S) **[SLIDERS] 13 (IN "L" RAMP") / 17 GRAM (IN "S" RAMP)
FINAL GEARS : 15/36 -- ( ORIGINAL GEAR RATIO WAS ......13 / 40 ) - I DID NOT KNOW ORIGINAL PRIOR TO ORDERING NEW GEARS
CLUTCH : STOCK WITH 1500 RPM CONTRA / CLUTCH SHOE SPRINGS ARE STOCK
CDI : UPGRADED TO A RACING WITH NO REV LIMIT
IGNITION COIL : UP GRADED TO A PERFORMANCE COIL
CARBURATOR : STOCK / PDJ24 - 24MM ( JETS ; STOCK -- FLOAT LEVEL CHANGED TO XXMM)
FUEL PUMP DUAL OUTPUT - VACUUM ACTUATED (LISTED AS FUEL PUMP FOR JET SKIES TO FEED 4 CARBS)
AIR SUPPLY : AIR BOX REMOVED AND REPLACED WITH UNI FILTER / RACING STYLE
P.A.I.R. / EGR REMOVED AND BLOCK OFF PLATE INSTALLED
BATTERY : DUAL "AGM" BATTERIES TIED IN PARRELELLE ( ONE 7 AMPH / ONE 9 AMPH ) = 8 AMP AVG
REAR TIRE : (ORINAL WORE FLAT IN 6,000 MILES - WAS FAULTY / UNBALLANCED / LEAKED ) REPLACED WITH
SHINKO SR429 - Tire Size: 130/60-13 - Position: Front/Rear, Tire Ply: 4, Speed Rating: L (TREAD DEPTH = 5.7MM = .224")
VACUUM LINES REPLACE WITH ALL AMERICAN THICK WALLED HOSE
FUEL LINES REPLACE WITH ALL AMERICAN THICK WALLED HOSE

I just googled it and found this link... Hope it helps.
www.motorcycle.com/specs/yamaha/touring-scooter/2005/majesty/400.html

Anyone know the "Best" unrestricted cdi & high performance ignition coil for gy6 150cc ?

Thinking my advanced curve cdi is not all its supposed to be / or is wearing out.
Do they wear out slowly - or just fail ?

Thanks Fugaziiv...

I had seen these before which got me interested --- Unfortunatly they are out of stock and the Japanese company only sends a shipment every six (6) months to once a year according to drowsports.

I cant believe that no one else (Japanese, Chinese, German, French, American) make them.

MONOPOLY ------- M-O-N-O-P-O-L-Y ....... D_

MILLIONS ----------- M-I-L-L-I-O-N-S ---- of "GY6-150cc" scooters and no one interested in making big bucks on it.

The Japanese "HATE" the "Chinese" and ****DO NOT WANT THEIR PRODUCT ON A CHINESE SCOOTER.

I was having conversations with Frando via e-mails and they had fun running me all over with the specs - one question after another.

I pointed them to Drowsports web link showing their (Frandos) product and Frando has not responded in the last three days.

Insanity !!!!

Well, since final gears have been brought up... I have recently swapped my final gears to 15/36.

Other upgrades include sparkplug, cdi - no rev limit, high ignition coil, dumped air filter box for uni-filter, motorio dual ramp 115mm variator (17/13 gram sliders), stock clutch with 1500rpm contra spring and... thats about it.

So would a bigger rear tire do anything.... the final gear swap only lowered my rpm's - top speed is 55 on the scooters dash board. 55 mph @ 6k rpm