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Post by adspeed on Sept 15, 2007 18:16:35 GMT
Anybody know of any Full circles for PK125/ETS/N/XL/XL2 24/25mm cone  |
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Post by Juan on Sept 15, 2007 22:14:36 GMT
Had a look around the usual suspects,Zadra,Fabrizi,Worb5,Grand Sport and they all offer one.As a 54mm stroke.Also found this but my German isn't good enough to tell you what the score is. |
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Post by tony on Sept 16, 2007 13:25:49 GMT
Now I know that Juan will shoot me with a smiley if I get this wrong  but 25/24 is ets..(juan???!!) What is wrong with xl type? The mazz full circle crank is pretty good in my opinion for race stuff anyway. Got one in me red ss too..different rods tho but no issues at all. Cheap too! |
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Post by adspeed on Sept 17, 2007 17:02:07 GMT
It must be just me but I don't see a full circle in 24/25  |
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Post by tony on Sept 17, 2007 23:29:14 GMT
xl is 24/24? maybe-- its the one where you can still use the nice split nu204 bearing. Its a good crank mate. The pin is tight. thats why i use em. You don't need the ets large bearing type in my opinion. If a crank is going to snap because of flywheel weight it will snap along the weakest point.This usually happenes mid taper on any crank. so having the larger bearing area of the ets probably won't save you.
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Post by shamrockexpress on Sept 18, 2007 23:22:48 GMT
xl is 24/24? maybe-- its the one where you can still use the nice split nu204 bearing. Its a good crank mate. The pin is tight. thats why i use em. You don't need the ets large bearing type in my opinion. If a crank is going to snap because of flywheel weight it will snap along the weakest point.This usually happenes mid taper on any crank. so having the larger bearing area of the ets probably won't save you. HI Tony on your recomendation i went the route of the 24/24 crank from beed speed using the split bearing and have no troubles at all plus it should not be a problem to split the cases in future with the 2-part bearing.................this was after trying the 25/24 route with conversion bearing which caused alot of hassle when splitting the engine so go 24/24 and you can use a hp4 flywheel on the 24 taper. Just when i,m on the subject i put a hp4 on at the weekend and the difference was very impressive it really let my polini 130 rev and go.............even to the extent of pulling 4th gear a bit better as its letting the revs pick up to pull the high revving polini evo exhaust. The only worrying part is quite a noise and rattle from the flywheel side that wasnt obvious with the heavy standard flywheel ,,,,,,,,,,,,,,,,,,,IS THIS NORMAL WITH HP4?  ?  |
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Post by tony on Sept 19, 2007 1:55:34 GMT
rattle!! check yer bearings mate. What type or make is the beedspeed crank? I tend to use mazz full circle cranks. They are ok. Check your big end brg and small end -rattles could be a number of things really.
The hp4 flywheel is the lightest i've used for the standard magneto ign. I've not had a prob with it on my road bike as yet tho i confess my mileage will be less than most scooterists. However this bike revs to 11.000 rpm so it is used harshly!
I don't understand the idea of a heavy flywheel allowing the motor to pull 4th gear as i've read elsewhere. I reckon if the motor is "right" it shouldn't need a big weight on the end of the crank to keep it going. The motor should make its power/torque within. Let us know if you sort it.
Take the fly cowl off,tug the flywheel and see if you have a lot of play across the crank. if so the drive side is going and must be changed.
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Post by shamrockexpress on Sept 19, 2007 20:41:57 GMT
 rattle!! check yer bearings mate. What type or make is the beedspeed crank? I tend to use mazz full circle cranks. They are ok. Check your big end brg and small end -rattles could be a number of things really. The hp4 flywheel is the lightest i've used for the standard magneto ign. I've not had a prob with it on my road bike as yet tho i confess my mileage will be less than most scooterists. However this bike revs to 11.000 rpm so it is used harshly! I don't understand the idea of a heavy flywheel allowing the motor to pull 4th gear as i've read elsewhere. I reckon if the motor is "right" it shouldn't need a big weight on the end of the crank to keep it going. The motor should make its power/torque within. Let us know if you sort it. Take the fly cowl off,tug the flywheel and see if you have a lot of play across the crank. if so the drive side is going and must be changed. hi tony if you remember from my first rebuild early in the year i had a cut-race mazz crank running crankcase induction which i mistakenly dremmelled a large whole then turned out my inlet timing was nearly 70 deg. with not a lot of sealing pad left which i blamed for more fuel spitting back thru my 24mm flatslide than going into the engine. so to reduce inlet timing i went for pk standard cut crank with large taper to take hp4 ( alan at beedspeed said he gets these cranks in specially) They are of of italian origin RMS "ALBERO MOTORE RACING" another add ition to help with the spit back is a mallossi reed valve which certainly has kept the fuel in the engine. As for the bearings they are new and properly installed (second time around "well you do have to learn the expensive way") so i will remove the hp4 to see where the noise is originating. Tony can you tell me what is the max power from a standard polini 130 kit ? and at what rpm is the engine making this power also can you recomend an exhaust for good torque mid range to work with my setup?? Thanx for the help so far Damian.
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Post by tony on Sept 19, 2007 23:57:52 GMT
hi fella.. let me get this right..you have a rotary valve with a reed on as well? Mmm. Reeds work well with up to 200degrees of inlet timing funny enough. You don't actually need 360 degrees. so your system will work but probably could be improved with much larger port-but no point if the rest is fairly standard.
I would guess by 70degrees of inlet timing you mean atdc? Well this would be fine if the rest of the motor could flow it. (Race stuff can use more than this with big ports).
I've never used rms cranks-did hear bad stuff about them but i really don't know.
Power wise..well i've tuned a few but only for road with average timings and around 14bhp when used with a vsp1 pipe from sip and rotary valve induction with-70 degress atdc!
Rpm-well depends on 1.exhaust 2.port timings and other factors like carb size and port area. You'll be able to change exhausts on the same kit to give you max power at different rpms. Go for something that gives you the best spread of power rather than just high peak figures as these mean nothing at all if they occurr at ony 500rpm. There is a link on here somewhere to view the smallframe ex test by scootering- the norrie replica won with the cheap noisy polini second i think-really worth a look.
Sorry for the long reply-lots of questions!
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Post by shamrockexpress on Sept 20, 2007 19:38:12 GMT
Thanx for the advice tony your christmas present is getting bigger!!!!!!!!!!!!!!!!! ;D
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Post by tony on Sept 20, 2007 20:57:34 GMT
i'm buying an ss90 shaped christmas stocking!! ;D
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Post by darkryder on Dec 9, 2007 12:49:17 GMT
Adspeed have you had any luck finding a full circle ETS 24/25 crank? I'm looking everywhere, and nothing!
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Post by adspeed on Dec 9, 2007 14:10:02 GMT
 Yep, only with 54mm stroke and unsure about quality and performance. I needed a 51mm so I'm converting a Mazza to fit. |
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Post by tony on Dec 9, 2007 23:50:38 GMT
so on the subject..does anyone know of a 54mm crank but rotary? Or do mazzucelli do a full circle 54 i can convert?
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Post by adspeed on Dec 10, 2007 16:48:23 GMT
What bearings/casings ya got Tony??? ETS???
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Post by tony on Dec 10, 2007 20:55:39 GMT
no, they are pk.. just normal pk adam.
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Post by darkryder on Dec 10, 2007 21:10:26 GMT
Found a full circle 24/25 ETS 54mm, a bit expensive! The thing is that sometimes Sip takes some time in translating in to English so if you write in German the the stuff you are looking for sometimes you get lucky!
Sip: 75050300
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Post by tony on Dec 10, 2007 22:18:01 GMT
mmmm!!! thanks fella, looks promising.
Does anyone have a crank handy and vernier to measure the standard clutch side diameter..i've never measured it.
Its 87mm on this crank.So machine to 89 i guess, then build up for a sealing pad. I was wondering how much has to come out?
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Post by Juan on Dec 10, 2007 22:26:42 GMT
An ETS crank Tony?I've got a few lying about I can measure with my Asda tapemeasure if thats any good.
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Post by tony on Dec 10, 2007 22:28:40 GMT
cheers mate, only if you have one to hand..not urgent. besides its grim outside tonight.
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but 25/24 is ets..(juan???!!) What is wrong with xl type? The mazz full circle crank is pretty good in my opinion for race stuff anyway. Got one in me red ss too..different rods tho but no issues at all. Cheap too!
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