[Group] DAELIM roadwin

[spacerevo]

  stsoh said:

the question should be work produce by engine.

 

125cc - 56.5 (bore) x 49.5 (stroke) = 11 hp (est).

140cc - 60.0 (bore) x 49.5 (stroke) = 13 hp (est).

200cc - 71.5 (bore) x 49.5 (stroke) = 16 hp (est).

 

why can't 200cc rev up to 10,000 rpm??

is it bad carb tuning??

is it too much load??

is it really 200cc??

seem a lot of material to trim off cylinder liner.

 

200 CC yep.. that was checked by piston size of a 125, 150 and 200 piston,

 

engine block completely changed to put in the 200cc piston. if you see the engine block closely. the lower part is slightly bigger than the upper block

 

Load, its kinda weriod as i tried to do top trottling at near empty fuel tank.. unless I'm the major weight..hahah..

 

Carb turning of my bike seems to be lean (based on perfomance , idling issues)

[driftbaker]

  spacerevo said:

200 CC yep.. that was checked by piston size of a 125, 150 and 200 piston,

 

engine block completely changed to put in the 200cc piston. if you see the engine block closely. the lower part is slightly bigger than the upper block

 

Load, its kinda weriod as i tried to do top trottling at near empty fuel tank.. unless I'm the major weight..hahah..

 

Carb turning of my bike seems to be lean (based on perfomance , idling issues)

 

spacerevo, means they didnt bore the block but they overhauled it?

[stsoh]

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Edited July 6, 2010 by stsoh

[stsoh]

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Edited July 6, 2010 by stsoh

[spacerevo]

  driftbaker said:

spacerevo, means they didnt bore the block but they overhauled it?

 

first rebored... i see lao i ask to change...

[spacerevo]

  stsoh said:

i don't think there is a restrictor on cdi.

i roll from fifth gear to do 110 kph @ 9k+ rpm.

if i pull first > second > third > fourth gearshift @ high rpm,

fifth gear can top 120 kph @ 10k rpm without any problem.

i can roll on fifth up to 120 kph along PIE between eunos n paya lebar stretch.

i can't do it along ECP max 110 kph, it can be strong head wind (wind resistance).

 

The CDI is used to control the spark and at the certain point of time.. no matter how much more you strain the trottle, the CDI detectes and cut off the capability to increase any more RPM

[stsoh]

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Edited July 6, 2010 by stsoh

[driftbaker]

  stsoh said:

the trick is fire before it reaches TDC (top dead center).

tat's why advance firing as revolution gets higher to allow fuel to burn earlier.

from low rpm 8 degrees to high rpm 28 degrees, even advance firing has got it's limits.

 

and it's the reason why u waste a lot of fuel if u travel >100 kph as compare to 60 kph.

 

:angel: Enlightenment ... TADA :angel:

 

:cheeky:

[driftbaker]

  spacerevo said:

The CDI is used to control the spark and at the certain point of time.. no matter how much more you strain the trottle, the CDI detectes and cut off the capability to increase any more RPM

 

  stsoh said:

CDI receive signal from pulse sensor, regardless of speed.

as long as your engine has got power to work up 10,000 rpm.

 

stock - 110 kph @ 10,000 rpm

don't think there is any cut-off unless it exceed 11,000 rpm.

racing CDI spec maybe more than 11,000 rpm, provided racing engine can produce power to go beyond 11,000 rpm.

 

this pulse sensor comes from the rpm of crankshaft rite? so there is a "restrictor" better known as cut-off. but it is insignificant in our rw because our roadwin dun have enough power to go beyond 10k rpm. m i right to put it in this way?

[stsoh]

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Edited July 6, 2010 by stsoh

[driftbaker]

  stsoh said:

u can test whether there is a restrictor on rpm.

slowly rise throttle rpm step by step from 3000 to 5000 to 8000 to 10000 rpm.

if there is a restrictor it will cut-off n reduce to the max rpm.

 

tat sounds logical. lol

[stsoh]

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Edited July 6, 2010 by stsoh

[driftbaker]

  stsoh said:

comparsion between 10:1 n 14:1 compression ratio,

which one do u think has got more horsepower?

 

more compression ratio determines more powerful engine.

 

the more volume in combustion chamber it can compress will produce more power.

 

compression ratio is the ratio between uncompressed volume over compressed volume. how does bore and stroke relate to this?

[stsoh]

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Edited July 6, 2010 by stsoh

[driftbaker]

  stsoh said:

yes, compressed vol vs uncompress vol.

total volume of piston (bore x stroke) + volume of top head space vs volume of piston (bore x stroke).

 

got it! thanks!!

[driftbaker]

  driftbaker said:

i'm still looking around for cheaper alternatives to replace my rxz head. how much are you selling?

 

hows? cos this sat most prob i going down to CKA BB to change. i''ll of cos choose the cheaper one. haha

[driftbaker]

st Sir, i went down CKA BB yday, then the mech say my rear brakes pump not functioning well. the pads are sticking to the disc, he said the pump doesn't return. i constantly hear squeaking sound when i reverse my bike. do u know why is it liddat? by the way, i've not repaired it cos by the time i reach CKA yday, they closing liao.

[stsoh]

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Edited July 6, 2010 by stsoh

[driftbaker]

  stsoh said:

wat i normally do is spray wd40 onto caliper pistons to work it loose.

sometime dirt n rust makes the piston sticky thus pads stuck to rotor.

 

which part of the caliper pistons? into which hole do i spray? do you do it on a regular basis or only when it happens?

 

the mech say inside not enough oil or seomthing liddat. but my brake fluid is full. so do i still need to go back to them to inspect?

[stsoh]

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[driftbaker]

  stsoh said:

spray wd40 between brake pad n housing.

u can see two pistons actuate against the back plate of the pads.

 

i tot if i sprayed in tat direction, i would be spraying between the pad and the disc? but wad u're saying is if i lay out the parts in order,

1)disc

2)air gap (which obviously is lacking in my bike currently.. hehe)

3)pad

4)back plate of pads

5)two pistons

so i should spray between 4 and 5?

[stsoh]

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Edited July 6, 2010 by stsoh

[driftbaker]

  stsoh said:

yes, between the back plate of the pad n dual pistons.

spray onto the two pistons actuating against the back-plate of the pad.

u can see it if u take a look.

there will be dirt n rust, spraying wd40 will get rid of those grimes,

thus free the movement of those pistons.

 

thanks sir. but how do i clean the mess aft tat? the space is tight..

[stsoh]

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Edited July 6, 2010 by stsoh

[driftbaker]

  stsoh said:

don't worry about the mess.

most of it will dripped down onto the tarmac.

heat from braking will vapourise all the wd40.

 

ahhhhhh... so there wont be danger of skidding rite?? haha. ok. tonite i try..

 

THANKS!