SBF Runners Cafe 2008 - FXR/VXR/RST

[spy622]

bro mohgui, i think u are running lean ar.. too much air .. ur current carb , dellorto rite, with original settings still can get rid the farting sound, no need to change jettings..

 

btw spy .. the carb u mentioned before, wat kind of price and milleage am i looking at? tried looking for it but usually after werk, no time liow...

 

there is only 1 "officially" suitable for vxr which is a dellorto 35mm sold by Malossi..prices r high but most aftmkt Jap carbs can also be use BUT the trouble is it might not be a direct fit...Try searching for kehin CV carbs of a bigger bore

[fatboy00]

Thank you for all valueable advice. I will check out all mention tips..

[fatboy00]

Actually i try save money to change multivar. Is it will improve pick up & mid?

[spy622]

Actually i try save money to change multivar. Is it will improve pick up & mid?

 

http://www.singaporebikes.com/forums/showpost.php?p=1119317&postcount=2

 

read n understand

[tranceaddict]

What improvement will a bigger carb do to the bike?? The only thing i changed on my bike is LV pipe.

[bongstar88]

drink more petrol!!! hehehe .. the carb to compliment ur lv and future open pod... hehehe,, they werk hand in hand.

[mohgui]

aiya y go n change GPR pipe???....well give u a clue...to solve the backfiring problem, u hav to setup ur carb really properly to suit the exhuast..so to make life easy, nv try to jet a carb which is difficult to jet where u hardly can find spares for jets n stuff...try jetting a more common carb wif many available spares.

 

If u nv change the GPR pipe in the 1st plc, the amount of $$ can be used for other stuff to "go faster" wifout having this farting problem

 

what to do? already changed liao. the lesson i'm taking these few weeks very expensive leh.

[mohgui]

bro mohgui, i think u are running lean ar.. too much air .. ur current carb , dellorto rite, with original settings still can get rid the farting sound, no need to change jettings..

 

yah... too much air that's why fart alot...

[BLACK COMET]

yah... too much air that's why fart alot...

 

Almost there. That's one of the reason for back firing.

 

What happens actually is that the airfuel mixture is abit too lean. Too much air, too little petrol

 

So it actually fail to combust in the combustion chamber. However, when this unburn mixture reaches the exhaust can. It combust immediately due to low pressure. (Lean mixture under high pressure will not combust).

 

As all know, combustion is basically the buring of hydrocarbon in a very fast rate. end result is rapid expansion of gas, heat and shockwaves.

 

And what dammage will it cause?

 

Imagine the exhaust valve is being reverse pressured by the gas expansion and shockwave. In long run, the valve will be dammaged. The worst senario will be the valve is close as the Piston is reaching the TDC possiton and this backfires, if strong enough, may cause the valve to open. Piston at Top most position and a open valve. U will get one of the most unpleasent surprise. And a very race lighten wallet after that.

 

That's not all. A exhaust header and end can is design to buffer exhaust gas expansion. Not mini explosion. IF u have lots of mini explosion over time. Don't think ur exhaust will last the designed lifespan.

 

Note, A leak in exhaust system, (eg. crack of improper seal) or a change to free flow after market exhaust is very likely to lean out the carb setting.

[fatboy00]

Almost there. That's one of the reason for back firing.

 

What happens actually is that the airfuel mixture is abit too lean. Too much air, too little petrol

 

So it actually fail to combust in the combustion chamber. However, when this unburn mixture reaches the exhaust can. It combust immediately due to low pressure. (Lean mixture under high pressure will not combust).

 

As all know, combustion is basically the buring of hydrocarbon in a very fast rate. end result is rapid expansion of gas, heat and shockwaves.

 

And what dammage will it cause?

 

Imagine the exhaust valve is being reverse pressured by the gas expansion and shockwave. In long run, the valve will be dammaged. The worst senario will be the valve is close as the Piston is reaching the TDC possiton and this backfires, if strong enough, may cause the valve to open. Piston at Top most position and a open valve. U will get one of the most unpleasent surprise. And a very race lighten wallet after that.

 

That's not all. A exhaust header and end can is design to buffer exhaust gas expansion. Not mini explosion. IF u have lots of mini explosion over time. Don't think ur exhaust will last the designed lifespan.

 

Note, A leak in exhaust system, (eg. crack of improper seal) or a change to free flow after market exhaust is very likely to lean out the carb setting.

 

That mean, better to change back open pod to original filter. Rite?

[BLACK COMET]

That mean, better to change back open pod to original filter. Rite?

 

 

Well. Depends how u look at it.

 

If you wanna go aftermarket open pod and aftermarket exhaust. u definately have to do so jettings and AF ajustment.

 

If not just leave everything stock.

 

If u have aftermarket exhaust. Changing bacl stock airbox may not help.

 

Cos, open pod - leans out the mixture

Aftermarket exhaust also leans out the mixture.

[mohgui]

wow... thanks for the insight. so now to resolve my problem is to tune my carb to ensure proper fuel+air mixture in the combustion chamber right? need to adjust jet settings too?

[tranceaddict]

drink more petrol!!! hehehe .. the carb to compliment ur lv and future open pod... hehehe,, they werk hand in hand.

 

Hehehe... Since u said it, my next project will be the carb and open pod.

[fatboy00]

That why i still keep open pod with lv pipe. But it really hard to get good turning.

[spy622]

wow... thanks for the insight. so now to resolve my problem is to tune my carb to ensure proper fuel+air mixture in the combustion chamber right? need to adjust jet settings too?

 

yes but itz not gonnabe easy

[sheep]

That why i still keep open pod with lv pipe. But it really hard to get good turning.

 

Of cos..

you no longer have the airbox to act as a constant supply of air for the carb already.

airflow to the open pod is inconsistent. try ur best.

[Flora]

hey guys check with you, where do u guys usually go for servicing? besides change engine oil.. will taihin or back to PSC will be a better choice..?

[Giles-Damien]

hey guys check with you, where do u guys usually go for servicing? besides change engine oil.. will taihin or back to PSC will be a better choice..?

 

i would rather choose bike shop outside than psc...

psc service ur bike at the back where u cant see what they doing...

[planescape]

Hi to riders of Runner! Some queries that some kind souls can help me with?

 

Piaggio site currently only has the 200 so i assume this is the newer model.

But actually what's the diff betw

SP180

VXR200

and something called... DNA?

 

There's a 2 stroke n there's a 4-stroke;

there's a manual & there's an automatic...

 

Which is which?

[goldstar]

Hi,pls help me wat the best tyre for our runner?(vxr 05).THank

[Reese]

gold standard

[goldstar]

gold standard

 

Thank bro:thumb:

[sheep]

Hi to riders of Runner! Some queries that some kind souls can help me with?

 

Piaggio site currently only has the 200 so i assume this is the newer model.

But actually what's the diff betw

SP180

VXR200

and something called... DNA?

 

There's a 2 stroke n there's a 4-stroke;

there's a manual & there's an automatic...

 

Which is which?

 

 

FXR180, SP180

VXR200 05 model

VXR200 06 onwards, complete face lift.

 

DNA is a 4 stroke 180cc sports scooter. rare.

[sheep]

Thank bro:thumb:

 

there are better tires than the gold standard.

Your 12 inch front and rear rims are magnets for good tires.

search around. you will be surprised.

[spy622]

Hi,pls help me wat the best tyre for our runner?(vxr 05).THank

 

wat do u mean by best tyres??...race slicks or wet slicks

 

if $$ is not a problem n excellent dry grip is concern wif gd movebility, then it will be Dunlop TT91gp...a race tyre used in most scoot n mini moto races n can be easily found locally which is the key.

 

Estimated around $180 for front n rear inclusive installation