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Old 05-26-2020, 10:03 AM   #1
longbow
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Default primary?

I bought a ultima 6 speed for a kraft tech rigid build and using a 74" shovel for the power plant and need a set of primarys for chain drive what primarys will bolt up?
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Old 05-26-2020, 03:20 PM   #2
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Default Re: primary?

http://www.ultimaproducts.com/sixspeed.htm
Link to Ultima 6 speed.
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Old 05-26-2020, 03:41 PM   #3
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Default Re: primary?

Thanks joe49
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Old 05-26-2020, 04:13 PM   #4
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Default Re: primary?

just so you know standard gearing the 74 will not pull it in 6 gear as an .086 ratio hi gear

you need to gear the bike down to use a 6 speed

evos contrary to what some think cant pull the 6 speed with a stock 80 inch

on line some one has an el with a 6 speed that's fine - but in the real world no
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Old 05-26-2020, 09:21 PM   #5
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Default Re: primary?

Here some head scratching for you to figure out what your needs are.
https://www.hotbikeweb.com/motorcycl...vetrain-basics
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Old 05-27-2020, 11:51 AM   #6
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Default Re: primary?

Thanks im going to try running a #2 grind andrews with a 22 tranny 51 rear wheel and see what happens.
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Old 05-27-2020, 03:46 PM   #7
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Default Re: primary?

the gearing is what we would do the cam is a dud - the A2 was developed for unleaded - its power range is 1400 to 4200

but its your choices to what works
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Old 05-27-2020, 06:05 PM   #8
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Default Re: primary?

I thought the A2 and #2 grind was different?
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Old 05-27-2020, 07:59 PM   #9
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Default Re: primary?

what John is saying is A2 is a better grind. 2 is for low compression engine of less than 8 to 1.
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Old 05-27-2020, 09:56 PM   #10
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gotcha thanks
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