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Post by geo49 on Oct 12, 2013 12:22:44 GMT -5
I was leaning toward aluminum but you made a good case for steel.
I only have just over 1700 miles on her and she runs good and don't want to replace the crank.
I do know that at WOT and speed is pretty much topped up I can hear a bit of a fluttering noise that might be my reeds but not sure?
I went premix when my injector pump started leaking so I bypassed it.
I do seem to use more oil premix than with injection and she smokes more but not to bad and mostly at start up.
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Post by pgs on Oct 14, 2013 21:05:15 GMT -5
i did not have to change the crank on mine when i put the kit on, but it usually only hits around 9500-9700 rpms when i gun it to get to top end quick, but then drops to around 8800 even at top speed, i have had no problems with the crank at all, the fluttering is probably your reeds like you stated, if you do get a bbk i would change the reeds when you do it and go with carbon fiber ones
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Post by skuttadawg on Oct 14, 2013 21:51:49 GMT -5
I plan on getting CF reeds and an intake too . When it comes to a 50cc hands down a 2T is better unless it is the the type that is chaindriven instead of having a CVT . The exhaust port was D shaped instead O shaped like the BBK so maybe porting it may help it go above 8k . If you stay at 9k or less you should be fine . The performance cranks can handle higher RPMs as some use needle bearings instead of ball bearings and the full circle type have higher compression too
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Post by geo49 on Oct 14, 2013 21:52:56 GMT -5
I think if I do go bbk I will do this when I stop riding for the winter. Doe's that Airsal kit need a bigger carb or can I just up jet? When I changed the pipe I up jetted the carb. with a #  or  jet. |
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Post by skuttadawg on Oct 14, 2013 23:07:24 GMT -5
Well if you have a 17.5mm carb yes as the 2T power kits include a 21mm carb . I have a 19mm TK carb that worked great when it was a 50 and again with a 47mm ( 70cc ) BBK , Uni and pipe with a 120 MJ
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Post by geo49 on Oct 14, 2013 23:29:20 GMT -5
How do I know what carb. I have?
It's the stock carb. that came on the scooter but I up jetted when I changed to an expansion chamber.
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Post by skuttadawg on Oct 15, 2013 0:19:16 GMT -5
Look inside the venturi for a stamping if not measure the venturi with a caliper . When it was a 50 I changed out the 68 MJ to a 75 . I later put on a small Uni vent cover as an airfilter with a 90MJ and it was a lil beast . Got the big red Uni but my dealer nor did any motorcycle shop around have my type of jets larger than a . Well being stubborn and impatient I rode it around the block even though it had a slight bog but not like it was stalling . Well it seized up and even melted the tip off the sparkplug which was the first for me with over 30 years of being on two wheels |
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Post by geo49 on Oct 15, 2013 0:43:51 GMT -5
Owners manual says its a PD31 if that means anything.
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Post by pgs on Oct 15, 2013 20:53:34 GMT -5
if you have a keeway from scooters plus it is a 17.5 carb, i went up a size on mine when i did the second bbk which was a airsal i went with a 19mm carb it was easier to get the jetting right
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Post by teddy554 on Oct 15, 2013 23:33:45 GMT -5
I have ran the stock 17 on bbk and a bigger 21 mm carb, the aftermarket bigger carb will rev faster and respond quicker but you can run the stock with about has good results until you can get one.I do recommend to by a jet kit for whatever carb you buy cause you run a on a stock doesnt mean thazt will be the size you need in the new carb plus it handy to have the extra sizes around for different season or if you change to a different filter later or so on |
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Post by geo49 on Oct 16, 2013 0:30:58 GMT -5
I did get the scooter from scooters plus in 2008 when he first opened.
Back then he was selling Yamati eurostrada rx8 models.
It's like a fact50 or a matrix50.
I think Yamati was making scooters for three years 2007-2009.
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Best out of 8 scooters I've owned.
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Post by gregw on Oct 17, 2013 17:36:35 GMT -5
On my 2001 Zuma, I had the biggest gains with swapping out the primary drive with a taller geared one. Then it was the BBK (69cc Stage 6 Race), I did the pipe, rollars, and bbk at the same time (Technigas NextR, Polini super speed Variator). I also swapped out my stock 14mm with a 21mm, and swapped out my stock intake to a Polini big bore intake with CF reeds. I can tell you for sure, the carb only made maybe a 5% differance in power (only at high rpm, 9,000+), and the reeds made zero differance. I had over 60 hours of run time on that motor and it ran perfect when I sold it. It would do 55 on the flat, 50 uphill and 60 downhill.
The moral of the story is; Don't waste your money on reeds or a carb until you've gotten the bbk, the pipe, variator and rollars, clutch springs, torque spring, and primary drive replaced.
Good luck!
(just an fyi, soft siezes are for people who don't know how to jet a motor. Always guess rich, and work your way lean. NOT the other way around.)
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or 
jet.
