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Post by teddy554 on Apr 24, 2012 9:59:27 GMT -5
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Post by 2strokd on Apr 24, 2012 10:57:43 GMT -5
Start rich on the jetting. Are you using a good carb? Ide be afraid a stock or small carb might have a lean swing and hurt the top-end. What pipe? You will need to "loosen" the cvt up with lighter weights and or tighter springs im sure. That kit will want to rev Congrats man   Wish you were L/C tho  . Coulda bought my kit  |
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Post by lshigham on Apr 24, 2012 11:00:27 GMT -5
You need a good pipe (I'd recommend a C16), carb of at least 21mm and a good crank to stop things going bang.
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Post by 2strokd on Apr 24, 2012 11:04:27 GMT -5
Good point Luke..... And a crank so things dont go bang lol.
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Post by lshigham on Apr 24, 2012 11:44:01 GMT -5
I know better than most lol  |
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Post by teddy554 on Apr 24, 2012 14:38:22 GMT -5
man that was a serious blow out, but i do have a 21mm arreche carb i will be ordering new jets 110 and 105 or should i go bigger. I cant upgrade the crank yet or the pipe but i do have tecnigs rs or next r cant remember off hand and i am hoping to keep the rpm down with the pipe until i can upgrade crank? that is possible right
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Post by lshigham on Apr 24, 2012 14:40:24 GMT -5
I wouldn't even contemplate it on a Mina based engine, that was with a Piaggio which have stronger cranks.
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Post by 90GTVert on Apr 24, 2012 14:44:20 GMT -5
I don't know a lot about the high end parts, but that pic would be enough to keep me from installing it on a stock crank.  With anything much beyond a sport kit people suggest an aftermarket crank for the 1E40QMBs. |
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Post by teddy554 on Apr 24, 2012 14:49:36 GMT -5
i guess i will find out
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Post by lshigham on Apr 24, 2012 15:03:02 GMT -5
The total cost of that failure was around £400, £150 for a new cylinder, £80 on new cases, £120 for a new crank and £20 for new main bearings.
It's a very expensive mistake to make.
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Post by teddy554 on Apr 24, 2012 15:15:00 GMT -5
yeah i really re thinking everything i will probably just park it and wait until i can afford the crank and some new reeds, thanks for making me rethink
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Post by lshigham on Apr 24, 2012 15:21:50 GMT -5
The stage6 kit comes with reeds  |
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Post by jmkjr72 on Apr 24, 2012 18:29:47 GMT -5
yeah i ahve seen zumas with failed cranks with the old stage 6 race kit so i wouldnt even consider running it without a new crank
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Post by skuttadawg on Apr 24, 2012 23:40:47 GMT -5
Where can I get a forged 47.6 mm kit ? Anyone tried this crank www.mhr-usa.com/racing-crankshafts/std-12mm/ I have seen ads for others but this one says its forged ( which I only want a forged crack ) has needle bearings instead of ball type and rated for 18,000 rpms . Yes 18,000 rpms wow which is more than beyond what a 72cc BBK would get up to , well a street legal one . www.wiseco.com is about the only forged billet pistons I can find but average costs 130 ans made in the USA which is a plus too . I used then when I raced amateur MX and they hold up to severe abuse |
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Post by teddy554 on Apr 27, 2012 18:58:47 GMT -5
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. Coulda bought my kit 
