stock engine take care eo and oil filter wont get damage much. but long term sure got some minor wear n tear inside engine. luckily your name is suhai not sohai. haha

haha, i know, it a muslim name, i know the meaning of 'sohai' , just want to change valve tapette

Hi everybody.. Eh wanna know the most used PJ MJ for 63.5 block ...


Spec ;
63.5mm block,
Uma carb 28mm,
Stock pipe
Stock cam
Stock spring valve
Race clutch spring
Stock clutch plate.

1. cannot tell without actually open up the engine head to check. From symptom, can engage gear, double stand the bike, and ask someone to slowly spin the tyre and someone else listen to the sound inside the engine head. It should not have any weird scratching, or knocking sound.
2. yes. it can be caused by normal wear and tear, or engine head or valve overheat, or not suitable EO (too thick/thin)
3. overhaul engine replacement - standard list follow the mileage in the service manual in page 1. others follow pomen recommendation, but be careful don't kena potong.
4. overhaul interval, follow service manual in page 1. For EO, I recommend Amsoil, but many ppl use here have bad review. Others include car EO like Royal Purple (aka RP), HDEO (Diesel EO), JTX, Castrol, Elf, Silkolene, Hi-Rev, Pennzoil, Yamaha etc.

---

Added on November 20, 2012, 10:16 am22.5 + 110

This post has been edited by alexei: Nov 20 2012, 10:16 AM

hahahaa changing valve tapette would be nice. and grind valve too.

Well currently on 38 PJ and 118 MJ, bikes chokes like hell. Plug white woh!

Didn't notice you referring to UMA 28mm. From RB catalog, it seems UMA PJ range is 30 to 52.

Engine choke at what RPM and throttle position?
Plug is white? How old is the plug? Can show pic? Why not you send to mechanic and tune?

[quote=alexei,Nov 20 2012, 10:13 AM]
1. cannot tell without actually open up the engine head to check. From symptom, can engage gear, double stand the bike, and ask someone to slowly spin the tyre and someone else listen to the sound inside the engine head. It should not have any weird scratching, or knocking sound.
2. yes. it can be caused by normal wear and tear, or engine head or valve overheat, or not suitable EO (too thick/thin)
3. overhaul engine replacement - standard list follow the mileage in the service manual in page 1. others follow pomen recommendation, but be careful don't kena potong.
4. overhaul interval, follow service manual in page 1. For EO, I recommend Amsoil, but many ppl use here have bad review. Others include car EO like Royal Purple (aka RP), HDEO (Diesel EO), JTX, Castrol, Elf, Silkolene, Hi-Rev, Pennzoil, Yamaha etc.

next sent my bike to bengkel, last time i use yamalube but change every 1k, now i use maxima ester, i dont remember its name, if fully syn ester, cost 45 like that,

[quote=crappy123,Nov 20 2012, 11:12 AM]
hahahaa changing valve tapette would be nice. and grind valve too.

[/quote]
does it expensive to change both of that?

Maxima, got booth at Sepang. Import oil. Should be ok. Eventually they will raise price, now still cheap. I bought their chain cleaning and lube kit.

depends on work shop. unlucky then kena potong lor, survey a few shops first. ask around.

i'm on pj 32 and mj 98 ....needle jet 2nd from above [62mm bore]

if using pj 38..try using mj 118/120+ [needle jet set middle,if still lean,then set lowest]

This post has been edited by machai_world: Nov 21 2012, 01:52 AM

Using a 28mm carb with those PJ setting, too rich for 4T bike.

This post has been edited by alexei: Nov 21 2012, 12:11 PM

done. PJ 30... MJ 125... ngam.. brown plug dy....

earlier needle was middle. now last notch (lean)...

this is valve makan. the tip gets chewed off


Attached thumbnail(s)

Hello all LCian,

Long time didn't "lepak"ing here...

Welcome to all new members.

thanks for update... you did it yourself?

if want change, better stock or racing valve? and what brand?

Bring your own timbang and get a lightweight one.

depends on your budget. ori valve not bad can tahan weekend race. i havent try other brands so i dont know

my friend doing it..