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Discussion Starter · #1 ·
have a few single port heads 2 of which i think are off a 1200 (others 1300), are there any numbers on em which will tell me which ones are which or can I measure them i.e. will the 1300 be wider bore?
also will 1300 rocker shafts fit 1200 heads ?
cheers all.
will hav to start labeling me spares !! :)
 

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the difference between 1200 and 1300 engines is the stroke of the crank, 1200 has a 66mm stroke, the 1300 has the standard 69mm stroke(same as 1500/1600)

there maybe a slight difference to the heads although im not sure, if i remember right though the rockers have a difference ratio, eg 1200 1:1 ration 1300+ 1.1:1 ratio. pistons should be same diameter. i think!
 

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Discussion Starter · #4 ·
CHEERS BUGSY, noticed some large numbers stamped on the rocker side of heads one was 58 i think an canna remember the other s !!" 61 maybe...
 
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