Planet Minis

Dirty70Bird · 12-15-2007, 09:58 PM

Hello, Anyone ever do this on a stock 6volt CT70 case, 4 speed? DrATVs ad says the stock 4 speed flywheel must be used, but I wonder if the rotating assembly could be balanced at a machine shop.

dax · 12-16-2007, 11:56 PM

I have this cdi:

CDI_CONVERSION_KIT FOR_FOUR_SPEED TRANNY_MODELS (400073)

with this crank:

52MM_STROKER_CRANK (CT70'S_CHECK_APP.) (ATC70_1978_TO_1985) (200002)

It works fine, and they say something about some grinding to be done, but I didn't have to do any.

Dirty70Bird · 12-17-2007, 10:57 AM

Did you check the balance or just run it?

dax · 12-17-2007, 01:33 PM

No, I didn't check the balance. I think these parts are supposed to work ok together without balancing. I have used it about 500 street miles last summer. For next summer i'll check if the flywheel can be lightened a little bit. In fact it isn't wery heavy even now; points type centrifugal advance flywheel was about 1200 grams, this is about 900 grams (sorry, wrong units for you). They were weighted, but I can't find the exact numbers now.

Dirty70Bird · 12-17-2007, 08:29 PM

Thanks Dax

12-15-2007, 09:58 PM	#1 (permalink)
Dirty70Bird PM Newbie Join Date: Dec 2005 Posts: 25	CDI kit and a stroker crank? Hello, Anyone ever do this on a stock 6volt CT70 case, 4 speed? DrATVs ad says the stock 4 speed flywheel must be used, but I wonder if the rotating assembly could be balanced at a machine shop.

12-16-2007, 11:56 PM	#2 (permalink)
dax 1st Gear Member Join Date: Jun 2006 Posts: 156	Re: CDI kit and a stroker crank? I have this cdi: CDI_CONVERSION_KIT FOR_FOUR_SPEED TRANNY_MODELS (400073) with this crank: 52MM_STROKER_CRANK (CT70'S_CHECK_APP.) (ATC70_1978_TO_1985) (200002) It works fine, and they say something about some grinding to be done, but I didn't have to do any.

12-17-2007, 10:57 AM	#3 (permalink)
Dirty70Bird PM Newbie Join Date: Dec 2005 Posts: 25	Re: CDI kit and a stroker crank? Did you check the balance or just run it?

12-17-2007, 01:33 PM	#4 (permalink)
dax 1st Gear Member Join Date: Jun 2006 Posts: 156	Re: CDI kit and a stroker crank? No, I didn't check the balance. I think these parts are supposed to work ok together without balancing. I have used it about 500 street miles last summer. For next summer i'll check if the flywheel can be lightened a little bit. In fact it isn't wery heavy even now; points type centrifugal advance flywheel was about 1200 grams, this is about 900 grams (sorry, wrong units for you). They were weighted, but I can't find the exact numbers now.

12-17-2007, 08:29 PM	#5 (permalink)
Dirty70Bird PM Newbie Join Date: Dec 2005 Posts: 25	Re: CDI kit and a stroker crank? Thanks Dax

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