Try to find a brand with thicker metal at the top and the material is light. Sometimes an unknown brand can be better than big brand.
After that, do head porting and custom your exhaust system to match it. Carburetor can use back standard size (22mm), but you need to change the pilot jet and main jet. The size of jetting has dependency on your exhaust and port flow, its better to leave it to some pro modder to tune for you on the spot.

CDI change to something that you can change ignition timing angle BTDC and rev limit. When air-fuel setting changed, the ignition have to change accordingly to get the maximum horsepower. Fix ignition curve CDI (like Kitti) can never give you this kind of flexibility.

MDS 60mm Bore kit [korek piston abit] or other thick sleeve [16x cc]
Head better you make porting and polish
CMS Valve Spring
CMS Hi-Cam or Custom Hi-cam
For carb...i suggest you to change suitable mainjet and pilotjet
CDI i suggest BRT Hyperband or other adjustable not programable
Change gear-4 [gearbox] to racing spec [21T/23T]
Gasket racing [infact of that, u need to buy Copper gasket for block to void leaking solution]
EO u need to use mineral type for new piston ring [for new installation and after 1k mileage]@i suggest Motul 3000
Oil Filter every new and after 1k mileage...
NGK G-Power....
changing new sprocket combination [follow your spec[pickup or top] and your body weight] diff setting diff combination
change new exhaust [for big manifold i.e Nobi,Yoshimura,CJ Ipoh,bm power etc]....anytype [dun take open exhaust type i.e YY-Pang,Endurance etc]
if you worried about compression go get this recipe
FZ150i bore kit FULL SET [150cc]
FZ150i crankshaft with 2mm jackrod [dun know how much +cc]
Custom Hicam
CMS Valve spring
For carb...i suggest you to change suitable mainjet and pilotjet
CDI i suggest BRT Hyperband or other adjustable not programable
Change gear-4 [gearbox] to racing spec [21T/23T]
EO u need to use mineral type for new piston ring [for new installation and after 1k mileage]@i suggest Motul 3000
Oil Filter every new and after 1k mileage...
NGK G-Power....
changing new sprocket combination [follow your spec[pickup or top] and your body weight] diff setting diff combination
about exhaust...not sure to change or not...better change new for large one manifold

LASTLY: PANTANG YOUR MOTOR FOR 2k...

MODIFY ENGINE WOULD EAT YOUR EO BANYAK

TOTAL COST: NOT MORE THAN 1.2k maybe

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Added on October 10, 2010, 10:09 pm
1 - MDS or other thicker sleeve RM100
2 - YSS 7-step type RM140
3 - Racingboy RM70
4 - KIPS RM200
5 - X1R or Racingboy RM250
6 - Bridgeston Battlex BT39 RM250
7 - BRT series +-RM300

I add up...for front tyre...Maxxis 3D RM100

TOTAL: RM+-1400

hehe,not for condemn...here my few feedback from nobi user...

one of that is

"Hujung ejos nobi [cover plastik]....senang cair....[u can't replace that]"

"bunyik saja sedap, tak pegi mana pun....tarak power lah especially trioval....[tried to get AHM/AHAU one which better or Yoshimura much much much much better...hahaha]

BECAREFULL picking YYPang / Endurance / AHM open type if your engine not really ready....that is open type...HATI2 LAH...hahaha

YYPang vs AHM... which better...both better in performance....if use in std engine...TAK BOLEH BLAH....

bout racing suit...you can got it for approx rm1k....diff quality diff pain in accident...hehe

Not ori Yamaha. its just a fake... but using Yammie logo.

Ok. Jalan Genting Klang u know?

Heading to Bulatan Pahang from Wangsa Maju. After u saw the Maybank on ur left (BHP too) go straight. And ur second red light (there is a Petronas on opposite side of the road right?) Keep left after the red light, u will see lot of bike shop and a small street on the left side, keep left and go in there. The shop name is Lea Craft. Fieldsheer agent in Malaysia

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Added on October 11, 2010, 1:05 am

Lol really dint face that problem so far. Cover plastik? herm wait tomorrow I got look which plastic..

Yep the power is not as much as the AHM/YYPang but, the sound is more civilised considering that we are sharing this neighbourhood with thousand others.

Hati2 lah? Yep careful. THose exhaust are meant for modified engine. My LC are fitted with 60mm block set with all internal changed. No point using them in a standard engine. And keep an eye on ur engine oil level if coz those short exhaust have a habit for decreasing ur engine oil.

Lain padang, lain belalang.