|
|
Post by baldmeister on Jan 18, 2013 16:38:13 GMT
hi , i have a 2011 px125 , i understand it has a 21 tooth primary gear, can anyone tell me , can i put a 22 or 23 tooth in without changing anything else to do with the gearing??
i have been told 22 is biggest ,just wanted to be sure .
|
|
|
|
Post by shaunpx on Jan 18, 2013 18:13:06 GMT
23 tooth wont fit for definate with out changing the helical primary gear on the input/ christmas tree shaft, bought a srcond hand clutch recently and had to change the clutch primary gear for it to fit my px200 not sure about the 22 tooth though, just as a point of interest does the standard px125 motor put out sufficient power for p2 gearing?
|
|
|
|
Post by sbwnik on Jan 18, 2013 21:53:51 GMT
Pretty sure you can't put a 22 tooth gear in. And no, P2 gearing is way too long for a 125 to pull.
|
|
|
|
Post by kru251 on Jan 19, 2013 1:24:04 GMT
Unless it's a bit special engine wise, a std125 can find itself overgeared to start with so I wouldn't be considering this unless all your journeys are downhill with a following wind!
|
|
|
|
Post by pxguru on Jan 19, 2013 8:29:51 GMT
A 22 tooth clutch gear will fit with your current primary gear (68). It won't do much though! As the others say, it will just make it a bit sluggish up hill. On a 125 you don't need longer gears. You need more RPM !! You're lucky if you can get a standard PX125 up to 6500 RPM. Some porting, head work, PX200 carb and a decent exhaust and you can get another 1000 RPM or 70+mph out of an otherwise standard PX125  |
|
|
|
Post by sbwnik on Jan 20, 2013 1:14:04 GMT
You don't need more RPM, you need more torque. I'd have thought you'd have known that.
And another 1000 rpm won't equate to a 70mph P125. They may equate to a theoretical one (71mph according to scooterhelps lovely gearing calculator) but you'd never pull that on the road without the torque.
|
|
|
|
Post by pxguru on Jan 20, 2013 9:29:30 GMT
Go ask your tuner friends who know what they are talking about...lol Another 1000 rpm is 70 mph on a 125 and it's not so difficult. Port it so max power is at least 1000 rpm higher. Machine the head. Blueprint the engine. Bigger carb. Decent pipe. Will go like stink on the flat. Easier just to bolt a 180 kit on though |
|
|
|
Post by baldmeister on Jan 20, 2013 15:21:50 GMT
hi. its got a dr180 kit on, sito plus exhaust and a 24mm carb.does this make any difference to the pulling power ?
it pulls like a trooper now compared to the standard 125,it even goes up hills!!(i used to have to put an application in a week in advance to go up hill!!)
|
|
britda
2nd Class Ticket
Posts: 4
|
Post by britda on Jan 20, 2013 15:47:10 GMT
the px comes with a 20 tooth gear, I have malossi 166, (straight bolt on, std crank), I only have the si 20 but going to upgrade this year to si 24, but I have a 22 tooth cog, and it go's like stink. But, it do's slow uphills and in wind. I would imagine the si 24 would over come this, but you may need to re-jet, just a little on the main to compensate for the extra heat generated by the extra workload. Could you post your main jet stack, air, mixer, main. idle jet, and have you drilled the airfilter? Ps I have the pinasco exhaust. www.rondaleyscooters.co.uk/pinasco-chrome-exhaust-px125lml125-i2032.html |
|
|
|
Post by joey on Jan 20, 2013 19:25:15 GMT
Go ask your tuner friends who know what they are talking about...lol Another 1000 rpm is 70 mph on a 125 and it's not so difficult. Port it so max power is at least 1000 rpm higher. Machine the head. Blueprint the engine. Bigger carb. Decent pipe. Will go like stink on the flat. Easier just to bolt a 180 kit on though Now that I'd like to see......... |
|
|
|
Post by pxguru on Jan 20, 2013 20:16:56 GMT
the px comes with a 20 tooth gear, I have malossi 166, (straight bolt on, std crank), I only have the si 20 but going to upgrade this year to si 24, but I have a 22 tooth cog, and it go's like stink. But, it do's slow uphills and in wind. I would imagine the si 24 would over come this, but you may need to re-jet, just a little on the main to compensate for the extra heat generated by the extra workload. Could you post your main jet stack, air, mixer, main. idle jet, and have you drilled the airfilter? Ps I have the pinasco exhaust. www.rondaleyscooters.co.uk/pinasco-chrome-exhaust-px125lml125-i2032.htmlSounds like you are nearly there with this one. Before you change the carb measure the compression ratio and squish clearance and tell us what they measure. If these aren't right you won't get this going much faster. |
|
|
|
Post by pxguru on Jan 20, 2013 20:22:50 GMT
Go ask your tuner friends who know what they are talking about...lol Another 1000 rpm is 70 mph on a 125 and it's not so difficult. Port it so max power is at least 1000 rpm higher. Machine the head. Blueprint the engine. Bigger carb. Decent pipe. Will go like stink on the flat. Easier just to bolt a 180 kit on though Now that I'd like to see......... no one (including me) bothers tuning 125 scooters anymore. 30 years ago we never had the money to just put kits on them and there was no T5! |
|
|
|
Post by joey on Jan 20, 2013 20:33:24 GMT
But then 30 years ago no one would have got a standard PX 125 cylinder to be capable of a true 70mph, they still struggle now with 166 and 177 kits...........
|
|
|
|
Post by pxguru on Jan 20, 2013 21:07:20 GMT
How fast does a T5 (125) go? And at how many rpm? And why is it faster than a PX125? Astound everyone with your knowledge
|
|
|
|
Post by kru251 on Jan 20, 2013 21:11:04 GMT
I think to some people it is a badge of honour thing. You know, my 125 blows away your 200cc etc. Yeah, it might,................................ but not for long and won't be as reliable; ever. What's that the Americans say? "Ain't no substitute for cubes"
|
|
|
|
Post by joey on Jan 20, 2013 22:27:11 GMT
How fast does a T5 (125) go? And at how many rpm? And why is it faster than a PX125? Astound everyone with your knowledge The book speed of a standard T5 Mk1 was, and still is 62/64 mph, depending on what literature you read, but it was only capable of this top speed on a perfectly flat road with no headwind as it had plenty of revs but very little torque. In standard format would rev out to roughly 7500 rpm mainly due to an improvement in porting, a much larger transfer area and a much lower stroke allowing for the higher revs............. On said windless day, with the same perfectly flat road it would beat a standard P200 marginally, introduce a headwind and a bit of an incline and the low revving, torquey P2 would p*sh all over it.................... anything I've missed? |
|
|
|
Post by pxguru on Jan 21, 2013 1:08:02 GMT
All good but you didn't mention the compression. There is quite a difference there. The T5 has 11.3:1 as standard. And PX125 has 8.2:1 as standard and max power is at 5700 rpm. The standard PX125 might look pretty but it's about as high performance as a lawnmower!
|
|
britda
2nd Class Ticket
Posts: 4
|
Post by britda on Jan 21, 2013 5:29:51 GMT
To answer the compression, Its a std malossi 166, some advertise as a reworked head, mine isnt. The kit is scored to buggery, after 2 heat seizes, (unexpected timing issue). But I have tested the compression, book is 11.1, which equates to 161.7 psi, mine is just under. Considering that the long reach plug adapter on the tester is a bit hollow, I'm very happy with that. Its top gps speed was 65.3 mph, which thanks to scooter help equates to 6758 rpm. The 24 mm carb should increase revs, by some, but I'm not looking for more speed but holding power. I'm running the std crank, I'm sure a race crank would help increase the revs a little too, with the longer induction phase. here is my post on Vespa Club of Britain Title is 2011 px 125 to malossi 166 kit in the vespa technical board. vespaclubofbritain.getphpbb.com/vespa-technical-f18/2011-px-125-to-malossi-166-kit-t8852.html?sid=d61d34196eecb3fbaeefe41323503a0aMy goal is to be able to ride at 56 mph 5796 rpm, no matter what the gradient of road, or wind. Well maybe the steeper hills i will expect it to slow abit. Want a reliable touring scooter, not speed. |
|
britda
2nd Class Ticket
Posts: 4
|
Post by britda on Jan 21, 2013 10:21:41 GMT
how about I just let malossi do all that. You had also better tell them about not being able to measure compression, they have it at 11.1, my compression test was almost an exact match.
|
|
|
|
Post by sbwnik on Jan 21, 2013 12:08:39 GMT
Go ask your tuner friends who know what they are talking about...lol Another 1000 rpm is 70 mph on a 125 and it's not so difficult. Port it so max power is at least 1000 rpm higher. Machine the head. Blueprint the engine. Bigger carb. Decent pipe. Will go like stink on the flat. Easier just to bolt a 180 kit on though 1000 rpm on a test bed isn't a problem. 1000 rpm on the road is. Simple as that. but i'll pass on your wise words, you obviously know better than they do.  |
|
