70cc kits

benjy bwoii · Borekit Bruiser Joined: 25 Nov 2007 Karma :

can 50cc cranks take the power of the 70cc kits.cheerz.

ms51ves3 · Super Spammer Joined: 07 Jun 2007 Karma :

It's not designed to take the extra weight of the piston but it will cope with it.

benjami · Nearly there... Joined: 14 Nov 2007 Karma :

It also depends on what 70 kit you're thinking of, and the milage of the original crank.

prawny1 · World Chat Champion Joined: 28 Jun 2005 Karma :

If the standard cranks can handle pulling my 18stone uncle around then i should think a 20cc capacity hoik would be fine.

Its high revs that small 2t cranks hate, they just twist or spit there big end bearings everywhere,

If your worried about your crank twisting or something from the extra power don't it should be fine,
but if you are worried then you could have the big end pin welded which will stop twisting but makes the crank unservicable when it wears out.

chris-red · Have you considered a TDM? Joined: 21 Sep 2005 Karma :

ms51ves3 · Super Spammer Joined: 07 Jun 2007 Karma :

It could be only slightly heavier though if the original piston was steel and the 70cc is aluminum.

chris-red · Have you considered a TDM? Joined: 21 Sep 2005 Karma :

ms51ves3 · Super Spammer Joined: 07 Jun 2007 Karma :

colin1 · Captain Safety Joined: 17 Feb 2005 Karma :

i think its more overheating that you have to worry about, but im not an expert on modifying 50cc bikes
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