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Author Topic: 80cc big bore  (Read 2783 times)

Scuzz

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80cc big bore
« on: December 24, 2011, 06:16:38 PM »
OK, I've installed an 80cc big bore kit in my 2006 agility. The bike would start but cut out, but now it wont start at all. I have installed a #94 jet in the carb etc. Would I need a larger pilot jet? Could it be the exhaust? Any help would be appreciated.
« Last Edit: December 24, 2011, 06:20:55 PM by Scuzz »
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Scuzz

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Re: 80cc big bore
« Reply #1 on: December 24, 2011, 06:33:35 PM »
I've also checked the spark plug
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blue

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Re: 80cc big bore
« Reply #2 on: December 24, 2011, 09:27:59 PM »
the best thing would of been to leave it as a 50. I would of loved to do that too but everyone I know that has. Had problems later. Happy I did now. I have a agilty also its a 07 and running good yet. good luck. sorry to sound rude but just saying it as I see it.
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Scuzz

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Re: 80cc big bore
« Reply #3 on: December 24, 2011, 09:48:03 PM »
Maybe you're right but it doesn't help my situation, thanks anyway.
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sidthesloth

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Re: 80cc big bore
« Reply #4 on: December 24, 2011, 10:10:27 PM »
Do you have spark? Are the valve clearances correct? Is the valve timing correct?
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ZX50, 47mm cyl. kit, TZR50 CDI. Michelin Pilot Sport tyres,
Next performance mod; pumping the tyres up.

sidthesloth

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Re: 80cc big bore
« Reply #5 on: December 24, 2011, 10:16:59 PM »
Blue, I have two sym vs scooters, a 125 and a 150, the only difference is the cylinder/piston. the only difference in the tramsmissions is the roller weights, 10 v 14 grams and the drive boss is 1mm shorter on the 150.
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ZX50, 47mm cyl. kit, TZR50 CDI. Michelin Pilot Sport tyres,
Next performance mod; pumping the tyres up.

Scuzz

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Re: 80cc big bore
« Reply #6 on: December 24, 2011, 10:17:59 PM »
OK I haven't checked the valve clearances, but there is a spark and the timings are correct. Cheers
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sidthesloth

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Re: 80cc big bore
« Reply #7 on: December 24, 2011, 10:21:21 PM »
If you haven't done so already, it won't hurt to recheck the valve timing, for peace of mgpgnd if nothing else. Is fuel getting through to carb and cylinder ok?
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ZX50, 47mm cyl. kit, TZR50 CDI. Michelin Pilot Sport tyres,
Next performance mod; pumping the tyres up.

Scuzz

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Re: 80cc big bore
« Reply #8 on: December 24, 2011, 10:25:10 PM »
Yeah I think the fuel is getting through OK
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sidthesloth

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Re: 80cc big bore
« Reply #9 on: December 24, 2011, 10:36:39 PM »
Is your spark plug wet with fuel?
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ZX50, 47mm cyl. kit, TZR50 CDI. Michelin Pilot Sport tyres,
Next performance mod; pumping the tyres up.

Scuzz

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Re: 80cc big bore
« Reply #10 on: December 24, 2011, 10:42:50 PM »
Yup
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sidthesloth

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Re: 80cc big bore
« Reply #11 on: December 24, 2011, 10:53:06 PM »
How is your compression, if that is ok then it is back to valve adjustment/timing.
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ZX50, 47mm cyl. kit, TZR50 CDI. Michelin Pilot Sport tyres,
Next performance mod; pumping the tyres up.

Scuzz

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Re: 80cc big bore
« Reply #12 on: December 24, 2011, 10:58:52 PM »
I haven't got the right device to check compression. Are you sure it's nothing to do with the jets?
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sidthesloth

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Re: 80cc big bore
« Reply #13 on: December 24, 2011, 11:07:31 PM »
It should run if you have fuel, ignition and compression. If not enough fuel it would run rough, but should still run.
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ZX50, 47mm cyl. kit, TZR50 CDI. Michelin Pilot Sport tyres,
Next performance mod; pumping the tyres up.

REDKYMCO

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Re: 80cc big bore
« Reply #14 on: December 24, 2011, 11:20:16 PM »
I have never really looked into the idea of fitting a big bore kit but i would have thought as you are fitting a bigger cylinder then you would also need a larger carburetor to allow for the extra air the scoot needs to breath in and larger exhaust for the higher volume of output, otherwise i would have thought you would be choking the engine......
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IF IT IS NOT BROKE DONT FIX IT:)

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