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Kyle

"Large" or "Small" Cone for GP?

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Bought some Indian Electronic Ignition kits. "Large Cone type"... and when they showed up they were LI "Small Cone" type.

OK,  I was always told that the GP Crankshaft is a "Large Cone" type.  Am I wrong?

This is what SIP has to say on the subject in their descriptions. (Not who I ordered from.)
"the cone for the Lambretta is only available in two versions which can be swapped with each other. The larger cone (measured directly after the oil seal seat) was originally only in the engine of the DL/GP, the smaller cone on all the other models tapers directly after the oil seal seat to 21mm. Under high pressure and/or a high numbers of revs, however, enormous forces impact on the entire cone, which the small point of the 21mm cone is not always able to reliably withstand. As a rule, the following applies here: the thicker the cone, the more stable and/or more suitable for tuning purposes. "

The GP/DL Cranks are definitely larger in Diameter and a longer taper. The LI/SX/TV Cranks are slimmer with a very short cone .

So which is the "Large Cone"?

Thanks for your helpful replies in advance.





 

CranksGPvsLI.jpg

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Post a photo of the inside of the flywheel and show us the flange for the taper. 

For gp it’s a shorter flange than the li in order to accommodate the wider crank taper.  

I agree it’s confusing at times. 

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If you were told you have a large cone flywheel it’s probably for Li/sx and the “large cone” refers to the flange in the flywheel being the longer type for the li cranks.  

The GP is short cone type. 

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The flywheel on the left it Li. Thats a large cone and refers to the height of thst flange. Its taller and as a result has a larger cone. The reason is for the narrower taper on the li crank. 

Right is gp. Short small flange to accomodate the fat tapered gp crank. 

If you received a small cone flywhel you got a gp flyhweel. 

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The reason for the confusion you are having is that the name of the flywheel refers to the type of flsnge on the flywheel, and the size of IT's cone... Not the size of the cone on the crankshaft it is suited for. 

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Bummer you had to go through that Kyle.

 

That's just a crappy way to describe them isn't it?

How about we use the more correct term?

Flywheel for a GP taper or LI/SX taper crankshaft.

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That's the danger when ordering electronic ignitions from India on ebay.  The translation is sometimes confusing.

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