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Post by Reign on Oct 14, 2009 15:59:25 GMT -5
That's a 40mm bore (49cc). D'oh. Nothing wrong with a 50cc, but 90cc would have been a nice find. Strange, because this is the engine that came with a carb with a 82.5 upjet. I've tried to get that same 82.5 running on my 50cc and it did nothing but bog no matter how much I messed with the screws. At least it had the better fan on it though!  |
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Post by 90GTVert on Oct 14, 2009 16:51:14 GMT -5
My 90cc had a carb and jet about the same as the 50cc. If you really think it's bigger, pull the head off and measure the bore.
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Post by Reign on Oct 14, 2009 17:38:15 GMT -5
My 90cc had a carb and jet about the same as the 50cc. If you really think it's bigger, pull the head off and measure the bore. You were right. 40mm cylinder. Though the outside really does look much bigger than the other 2 engines. |
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Post by 90GTVert on Oct 14, 2009 19:47:36 GMT -5
Nothing to be disappointed about either way, I wish I had spare minarelli engines just lying around. lol
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Post by 190mech on Oct 14, 2009 20:09:46 GMT -5
I've got a 48mm piston kit that autotech355 included in my original kit.I cant use it as my CPI uses a 12mm pin.Its yours if you can use it,you'll have to bore your cylinder though.
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Post by 2strokd on Oct 15, 2009 7:53:02 GMT -5
Hey thanks a ton 190mech, mighty nice of you!
Im not sure i can use it though. If i bored the 46mm cylinder to a 48mm bore wouldnt that change my ports and timing? hhhmmm....
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Post by 90GTVert on Oct 15, 2009 7:58:56 GMT -5
I've seen folks elsewhere say that stock cylinders could be bored up over 50mm. I would think that, given the angles some ports enter, that would change timing. Perhaps it would be a very minimal difference when you're only knocking off 1mm (0.039") from the wall. If you do decide to try, it may not be a bad idea to make a port map before and after to see what changed and hopefully allow you to get everything back to the specs you want.
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Post by Enviromoto on Oct 15, 2009 12:55:54 GMT -5
I have some 70cc 10mm Polini sport kits I could let go cheap. PM me if your interested.
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Post by 2strokd on Oct 15, 2009 16:13:47 GMT -5
PM,ed... I would like to try and get some more top end outta one of these kit without loosing any of the bottom end punch that makes them special. I need to do more homework myself before attempting but some good port work might do the job. Yeah im interested for sure. Lets see what this kit acts like with a bigger carb and maybe some porting.  |
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Post by 2strokd on Oct 20, 2009 18:56:26 GMT -5
I sure miss that torque on these windy days  . On top off not having the power of the 70cc Skeedr ran like crap today all day, i just didnt have time to figure out why. It acted rich even sputtering when going from 3/4 to full throttle and sometimes from a stop going to WOT it would sputter like it is rich. I do still have a 70cc boost bottle hooked up but that wasnt a problem before today with the 49cc jug on. I know a 49cc boost bottle would help I parked it for the night, looked at a few things and noticed my fuel filter is about empty again  . I was thinking "this is the last time i am going to have this problem, i will drill the petcock out and eliminate the vac source and it will be gravity feed from now on". Then i thought, what is causing this? Most of the time my fuel filter is full, every once in a while i have problems with flow. Could this be more than just a bad petcock? |
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Post by 190mech on Oct 20, 2009 19:21:52 GMT -5
Its not unusual to have an air bubble in a fuel filter,ya could flow test it by applying vacuum to the petcock vac hose..I had one
bust the diaphram and leak fuel thru the vac hose making a
very rich situation..
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Post by 2strokd on Oct 20, 2009 19:31:14 GMT -5
Thanks, i already tried the vac test, filled the filter right back up.
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Post by 2strokd on Oct 22, 2009 7:27:33 GMT -5
I guess the 70cc boost bottle caused me to loose some vac.?.
I unhooked it yesterday and the filter is staying full. lol duh, i shouldnt have had a 70 bottle on a 50 anyway. It runs allot better now too. I really didnt think it would make that much of a diff. Maybe the bottle is leaking? I will check it out.
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Post by 2strokd on Oct 23, 2009 12:05:29 GMT -5
Package received ;D. Thanks Jeremy!  |
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Post by Enviromoto on Oct 23, 2009 17:49:50 GMT -5
Is it me or does the Polini race scooter on that box just look slick as hell?
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. 
. I was thinking "this is the last time i am going to have this problem, i will drill the petcock out and eliminate the vac source and it will be gravity feed from now on". Then i thought, what is causing this? Most of the time my fuel filter is full, every once in a while i have problems with flow. Could this be more than just a bad petcock?