How to tell when to overhaul engine?

[aStRoBo]

done.

 

10chars.

Edited February 2, 2010 by aStRoBo|

[lwfc]

if you have no idea with engine parts etc.. the best way is to..

 

overhaul when your TRUSTED mech tells you to do so..

[mepkoh]

when the bike feels lousy...no power..high fc..and you have done all the regular maintenance..time to open engine..At 100,000 km...

[deckard]

when you see white smoke??

[aStRoBo]

when the bike feels lousy...no power..high fc..and you have done all the regular maintenance..time to open engine..At 100,000 km...

 

hmm... valid case. will take note of the fc. thnks!

[crazydj]

I don't see white smoke. But my bike ALWAYS FEELS LOUSY! Change bike? Hehe! Anyway, my bike reaching 100,000km soon. No need overhaul until got problem right?

Edited July 23, 2009 by crazydj

[kingdavid]

white smoke can occur when the weather is cold too.

EG; just finish a heavy rain session and your bike was park there throughout the night. When you start , you will see white smoke...

[JbAtRaCeR]

Engine oil will always be black and thick,when you are changing the eo. The colour black is because of carbon deposits,small tiny metal shaving and etc.

 

Purpose of the engine oil is to lubricate,cool and clean engine parts.

 

Its looks thick because engine oil having this character of thickening when its at running temperature.(multiple viscosity oil like 10W-40 and etc)

 

Simplest way to know when you need an overhaul is by reading the sparkplugs.

 

1.Black and wet(oil control rings maybe gone).

2.Black and sooty(lots of carbon),too rich mixture(need carb tuning and cleaning of airfilters)

3.Whitish colour (lean mixture) (need to tune carbs)

4. Chocolate or tea colur (The BEST!)

 

Next is by looking at the exhaust colour:-

 

Black lots of carbon(Too rich mixture or dirty airfilters)

White smoke on a hot day (water entering combustion chamber/head gasket leakage or etc)

Bluish white smoke(Engine oil consumption/Time for an overhaul)

 

There are other ways to know how healthy the engine is like "compression leak test",but this method just leave it to the greasemonkeys...

 

Oh ya forget to mention this only applies to 4 stroke engines..

[aStRoBo]

^ thnks for the helpful input... mine is a 4 stroker. cub. mileage only 37k. i was quite surprise when i was told tat my engine needs a overhaul. btw, my exhaust no smoke coming out. very minimal.

[ridhzam]

Engine oil will always be black and thick,when you are changing the eo. The colour black is because of carbon deposits,small tiny metal shaving and etc.

 

Purpose of the engine oil is to lubricate,cool and clean engine parts.

 

Its looks thick because engine oil having this character of thickening when its at running temperature.(multiple viscosity oil like 10W-40 and etc)

 

Simplest way to know when you need an overhaul is by reading the sparkplugs.

 

1.Black and wet(oil control rings maybe gone).

2.Black and sooty(lots of carbon),too rich mixture(need carb tuning and cleaning of airfilters)

3.Whitish colour (lean mixture) (need to tune carbs)

4. Chocolate or tea colur (The BEST!)

 

Next is by looking at the exhaust colour:-

 

Black lots of carbon(Too rich mixture or dirty airfilters)

White smoke on a hot day (water entering combustion chamber/head gasket leakage or etc)

Bluish white smoke(Engine oil consumption/Time for an overhaul)

 

There are other ways to know how healthy the engine is like "compression leak test",but this method just leave it to the greasemonkeys...

 

Oh ya forget to mention this only applies to 4 stroke engines..

 

 

very informative ...

[crazydj]

Engine oil will always be black and thick,when you are changing the eo. The colour black is because of carbon deposits,small tiny metal shaving and etc.

 

Purpose of the engine oil is to lubricate,cool and clean engine parts.

 

Its looks thick because engine oil having this character of thickening when its at running temperature.(multiple viscosity oil like 10W-40 and etc)

 

Simplest way to know when you need an overhaul is by reading the sparkplugs.

 

1.Black and wet(oil control rings maybe gone).

2.Black and sooty(lots of carbon),too rich mixture(need carb tuning and cleaning of airfilters)

3.Whitish colour (lean mixture) (need to tune carbs)

4. Chocolate or tea colur (The BEST!)

 

Next is by looking at the exhaust colour:-

 

Black lots of carbon(Too rich mixture or dirty airfilters)

White smoke on a hot day (water entering combustion chamber/head gasket leakage or etc)

Bluish white smoke(Engine oil consumption/Time for an overhaul)

 

There are other ways to know how healthy the engine is like "compression leak test",but this method just leave it to the greasemonkeys...

 

Oh ya forget to mention this only applies to 4 stroke engines..

 

Hah! My YBR got nice tea colour barely any carbon deposits! and its mileage is 90,000+km! Am i dreaming or something is happening to my bike?

[JbAtRaCeR]

Hah! My YBR got nice tea colour barely any carbon deposits! and its mileage is 90,000+km! Am i dreaming or something is happening to my bike?

 

With regular maintainence/inspection like changing of engine oil,correct supply of air/fuel ratio by the carbs,engines can last a very2 long time. Trust me bro....

[crazydj]

Ahh! Thanks bro! Like they say, if it aint broken, don't fix it!

[JbAtRaCeR]

Ahh! Thanks bro! Like they say, if it aint broken, don't fix it!

 

Its more of like if it aint worn out dont fix it..Waiting for it to be broken is like too late,just imagine you go touring,suddenly your wheel bearing fail..If can move ok lah..if jammed!..chialat,where the hell you gonna get spares...Bearing shop is like maybe 50 or 100km away..