1
zx50 / Re: zx50 with Taiwanese 80cc upgrade and 24mm PWK
« on: June 13, 2013, 01:30:01 AM »
he wants 90 on a different scooter.
Show Posts
This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.
Pages: [1]
2
zx50 / Re: zx50 with Taiwanese 80cc upgrade and 24mm PWK
« on: May 11, 2013, 05:34:49 AM »
raindrop what are your specs? are you running 80cc bb kit and a 24mm pwk?
what needle are you running?
what needle are you running?
3
zx50 / Re: zx50 with Taiwanese 80cc upgrade and 24mm PWK
« on: May 09, 2013, 12:59:30 AM »so curious why did u change ur pilot jet ?because it ran like sh** with the 45 and runs perfect with the 42
i run 120 main .. plenty ! .. 45 pilot about 1 and 1/4 turns ... put a bb yes a bb in that stupid power jet line .. trust me
what is a bb in the powerjet line?
4
zx50 / Re: My second ZX50
« on: May 06, 2013, 11:51:30 PM »
took out the restricted boss and replaced with an unrestricted one and now i get 59kph. better but still crap.
i looked into the leo vince exhaust and saw that it had a restricter in it. ill remove that and repost results.
i looked into the leo vince exhaust and saw that it had a restricter in it. ill remove that and repost results.
5
zx50 / Re: zx50 with Taiwanese 80cc upgrade and 24mm PWK
« on: May 06, 2013, 11:48:46 PM »
im running 25:1 as advised by autotech355 but its pretty rich. actually to be over cautious i i made it even richer like 20:1 during run in phase. ill lean it out over time.
6
zx50 / Re: zx50 with Taiwanese 80cc upgrade and 24mm PWK
« on: May 05, 2013, 08:44:10 AM »
So I dropped in a JJH needle and a 42 primary jet and its sharp and tight off idle. Plenty of power now i can play with main jet.
Now the other problem is back where the carby is being starved of fuel again after a few mins riding. I am convinced this is a needle and float problem. I need more input flow
Now the other problem is back where the carby is being starved of fuel again after a few mins riding. I am convinced this is a needle and float problem. I need more input flow
7
zx50 / Re: zx50 with Taiwanese 80cc upgrade and 24mm PWK
« on: May 01, 2013, 10:53:31 PM »
my idle jet is a 45 and main is 105. the main shouldn't be the problem. reading the guides i posted above it is likely the needle, idle jet or mixture.
i have received my jets and needles but i wrecked my stator plate trying to remove the variator and now i have no spark. stupid mistake so im now waiting for a flywheel puller to try and repair it.
i am going to start with a new needle - JJH. visibly it is different and seems to be the most common that people use. it seems to have more meat down low so im guessing less fuel. ill try that first, and then try the idle jet.
i have received my jets and needles but i wrecked my stator plate trying to remove the variator and now i have no spark. stupid mistake so im now waiting for a flywheel puller to try and repair it.
i am going to start with a new needle - JJH. visibly it is different and seems to be the most common that people use. it seems to have more meat down low so im guessing less fuel. ill try that first, and then try the idle jet.
8
zx50 / Re: My second ZX50
« on: April 23, 2013, 01:13:28 AM »
this one pictured above is approximately 37mm. SA's version has no shoulder and is 36mm
9
zx50 / Re: My second ZX50
« on: April 22, 2013, 09:42:30 AM »
when i first took it out i was getting 42kph with the limited CDI. pretty weak.
i swapped the CDI for an unrestricted one and threw on my leo vince and the speed went up to 49kph. still horrible!
took the variator off and found that it had the restricted boss so i have one on order from SA.
i swapped the CDI for an unrestricted one and threw on my leo vince and the speed went up to 49kph. still horrible!
took the variator off and found that it had the restricted boss so i have one on order from SA.
10
zx50 / My second ZX50
« on: April 21, 2013, 03:06:29 AM »
after seeing the power increase in my 80cc upgrade on the original scoot, i couldnt help myself and found this in the classifieds for $400. bargain - its original, runs good, all the faring is tight and all the tabs are still in tact. it just looks bad because there are scratches and cracks and its faded. most people wouldnt touch it but i can see potential!
i think ill turn this one into my run-around scoot. it doesnt have to be hardcore but it still needs to have the power to pull 170kg (my wife and i) up decent hills.
i have a leo vince exhaust, but is there anything else i can do to the stock engine, like a carby upgrade, in the mean time?
can anyone summarise what roller weights and clutch springs do? or link to an explanation?
i think ill turn this one into my run-around scoot. it doesnt have to be hardcore but it still needs to have the power to pull 170kg (my wife and i) up decent hills.
i have a leo vince exhaust, but is there anything else i can do to the stock engine, like a carby upgrade, in the mean time?
can anyone summarise what roller weights and clutch springs do? or link to an explanation?
11
zx50 / Re: zx50 with Taiwanese 80cc upgrade and 24mm PWK
« on: April 18, 2013, 02:53:25 AM »
No its not needing a bigger jet, the engine wasnt starving - well it was but the carby was starving first.
what i have done so far is replace the vacuum fuel tap with a standard brass barb i got at a local hose fitting shop (Enzed in AU) which has allowed the fuel to flow freely without any complications. i also added more fuel to give it more hydraulic weight. i was doing my testing with 1 litre at a time which could have also caused problems. also added a clear filter so i could see flow.
We think that the problem was either with not enough vacuum from the inlet on this motor when the throttle is open, or a faulty tap.
anyway i am now getting continuous rides without starvation and am onto tuning the jets. will keep you updated with results of jetting.
Jetting/Tuning so far
my 24mm motoritec flatside PWK carby came with a 105 main jet and a 45 pilot jet. the needle has markings that say PW24. most information out there seems more geared around the 3 letter standard in sizing and as far as i can tell there is no clear comparison. this is just a standard needle for this carby. some say that the first step is put in a JJH needle so that is what i will do
the scoot has incredible top end power and if you keep the revs up it runs great. but it is very bad off the line or at idle or 1/4 to 1/3 throttle. it dies, coughs - you have to keep playing with it. we are going to work on the fact that it might be too rich so first step is looking at a larger diameter needle and/or a smaller low speed pilot jet.
i have ordered a selection from scootRS.com ranging up and down from the current jets and needle in the carb.
Some good tuning guides are here, ill be following them closely
http://www.duncanracing.com/TechCenter/KeihinCarbJetting.pdf
http://scootrs.com/tech.cfm?tip=tunecarb
what i have done so far is replace the vacuum fuel tap with a standard brass barb i got at a local hose fitting shop (Enzed in AU) which has allowed the fuel to flow freely without any complications. i also added more fuel to give it more hydraulic weight. i was doing my testing with 1 litre at a time which could have also caused problems. also added a clear filter so i could see flow.
We think that the problem was either with not enough vacuum from the inlet on this motor when the throttle is open, or a faulty tap.
anyway i am now getting continuous rides without starvation and am onto tuning the jets. will keep you updated with results of jetting.
Jetting/Tuning so far
my 24mm motoritec flatside PWK carby came with a 105 main jet and a 45 pilot jet. the needle has markings that say PW24. most information out there seems more geared around the 3 letter standard in sizing and as far as i can tell there is no clear comparison. this is just a standard needle for this carby. some say that the first step is put in a JJH needle so that is what i will do
the scoot has incredible top end power and if you keep the revs up it runs great. but it is very bad off the line or at idle or 1/4 to 1/3 throttle. it dies, coughs - you have to keep playing with it. we are going to work on the fact that it might be too rich so first step is looking at a larger diameter needle and/or a smaller low speed pilot jet.
i have ordered a selection from scootRS.com ranging up and down from the current jets and needle in the carb.
Some good tuning guides are here, ill be following them closely
http://www.duncanracing.com/TechCenter/KeihinCarbJetting.pdf
http://scootrs.com/tech.cfm?tip=tunecarb
12
zx50 / Re: zx50 with Taiwanese 80cc upgrade and 24mm PWK
« on: April 16, 2013, 10:40:17 PM »
thanks for the reply!
im not sure, i havent looked. i reckon that if we bought the same kit, its likely we have the same size.
what is the purpose of the jet? could it stop the flow of fuel to the carby from the tank? i thought they determined how much fuel went into the engine from the carby. if that is the case then the scoot would not have died completely and then taken a few minutes to restart?
im not sure, i havent looked. i reckon that if we bought the same kit, its likely we have the same size.
what is the purpose of the jet? could it stop the flow of fuel to the carby from the tank? i thought they determined how much fuel went into the engine from the carby. if that is the case then the scoot would not have died completely and then taken a few minutes to restart?
13
zx50 / zx50 with Taiwanese 80cc upgrade and 24mm PWK
« on: April 16, 2013, 12:52:31 PM »
Hey all
i recently bought some Taiwanese parts from ebay, the quality is decent and they were cheap as. this is my first build so i was happy to go cheap while i am learning in case i break something or get the wrong part.
Cylinder Kit
http://www.ebay.com.au/itm/330899005635?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649#ht_1502wt_931
Carby Kit
http://www.ebay.com.au/itm/330901615725?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649#ht_1368wt_1163
everything fit together quite nicely and i am able to get the scoot to run - WOW the power increase is incredible! it goes so hard!
But i am having a problem where after riding for a little while (2-3 mins) the scooter dies and needs a few minutes before it will start again. i have a strong feeling it is running out of fuel and right now i am thinking its because i am using the original vacuum valve on the fuel tank, and possibly im not getting enough vacuum when the throttle is open so the valve is shutting off. i cant think any other reason.
So how do you guys run your upgrade PWKs - do you replace the vacuum tap with a standard tap?
also i am still using the standard jets that came with the carby - any advice on what size jets i should run?
thanks in advance!
i recently bought some Taiwanese parts from ebay, the quality is decent and they were cheap as. this is my first build so i was happy to go cheap while i am learning in case i break something or get the wrong part.
Cylinder Kit
http://www.ebay.com.au/itm/330899005635?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649#ht_1502wt_931
Carby Kit
http://www.ebay.com.au/itm/330901615725?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649#ht_1368wt_1163
everything fit together quite nicely and i am able to get the scoot to run - WOW the power increase is incredible! it goes so hard!
But i am having a problem where after riding for a little while (2-3 mins) the scooter dies and needs a few minutes before it will start again. i have a strong feeling it is running out of fuel and right now i am thinking its because i am using the original vacuum valve on the fuel tank, and possibly im not getting enough vacuum when the throttle is open so the valve is shutting off. i cant think any other reason.
So how do you guys run your upgrade PWKs - do you replace the vacuum tap with a standard tap?
also i am still using the standard jets that came with the carby - any advice on what size jets i should run?
thanks in advance!
Pages: [1]